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aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 1 www.analogictech.com general description the aat2860-x is a highly integrated charge pump-based lighting management unit (lmu) with three low dropout (ldo) regulators optimized for single-cell lithium-ion/ polymer systems. the charge pump provides power for all led outputs; multiple backlight and flash led configu- rations are available. the backlight led outputs can be programmed up to 31ma each and the flash led outputs can be programmed up to 300ma each. an i 2 c compati- ble serial digital interface is used to enable, disable, and set the current to one of 32 levels for the backlight and one of 16 levels for the flash. a programmable safety timer and flash control input is included for easy flash control. backlight current matching is better than 3% for uniform display brightness, and flash current matching is better than 5% for uniform power dissipation. the aat2860-x offers three high-performance low-noise micropower? ldo linear regulators. the regulators are enabled and their output voltages are set through the i 2 c compatible serial interface. each ldo can supply up to 300ma load current and ground-pin current is only 80a making the aat2860-x ideal for battery-operated applications. the aat2860-x is available in a pb-free, space saving tqfn34-24 package and operates over the -40c to +85c ambient temperature range. features ? input voltage range: 2.7v to 5.5v ? i 2 c compatible serial interface ? tri-mode charge pump ? drives up to seven leds (backlight/flash) ? programmable backlight current settings ? 32 levels - 0.5ma to 31ma ? programmable flash current ? 16 levels ? off to 300ma ? 1mhz switching frequency ? automatic soft-start ? three low dropout regulators ? 300ma output current ? 150mv dropout ? programmable output from 1.5v to 3.0v ? output auto-discharge for fast shutdown ? built-in thermal protection ? -40c to +85c temperature range ? tqfn34-24 package applications ? camera enabled mobile devices ? digital still cameras ? multimedia mobile phones typical application c1 1f c2 1f c1+ c1- c2+ c2- in c out 2.2f v out out bl1 bl2 bl3 bl4 bl7/fl2 v ldoa at 300m a ldoa c ldoa 2.2f v bat 3. 6v aat2860-x agnd bl5 bl6/fl1 led_sel led select ldo_sel fl_lvl flash level select c in 4.7f c in 4.7f ldob c ldob 2.2f ldoc c ldoc 2.2f pgnd v ldob at 300ma v ldoc at 300ma sda sda scl scl i 2 c serial interface wleds osram lw m673 or equivalent in ldo select flash leds lumiled lxcl-pwf1 or equivalent
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2 2860.2008.05.1.0 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2 2860.2008.05.1.0 www.analogictech.com pin descriptions pin # symbol description 1 out charge pump output. out is the output of the charge pump and supplies current to the backlight and ash leds. connect the backlight and ash led anodes to out. bypass out to pgnd with a 2.2 f or larger ceramic capacitor as close to the aat2860-x as possible. 2 c2+ positive terminal of charge pump capacitor 2. connect the 1 f charge pump capacitor 2 from c2+ to c2-. 3 sda i 2 c compatible serial data input. sda is the data input of the i 2 c serial interface. drive sda with the i 2 c data. 4 scl i 2 c compatible serial clock input. scl is the clock input of the i 2 c serial interface. drive scl with the i 2 c clock. 5 led_sel led programming enable input. when led_sel is strobed low-to-high, the backlight and ash led registers can be programmed via the i 2 c compatible serial interface. when led_sel is strobed high-to-low, all backlight and ash led outputs are turned off and the backlight and ash led registers are reset to their default (power- on-reset or por) values. 6 fl_lvl (agnd) aat2860-2/3/4: flash/torch enable input. when led_sel is strobed high and fl_lvl is strobed high, the ash led current outputs are enabled and set according to the contents of the ash led current register. when fl_lvl is strobed high-to-low, the ash led outputs return to their low-level programmed values. aat2860-1/5: connect to agnd. 7 ldo_sel programming enable input for ldo[a, b, c]. when ldo_sel is strobed low-to-high, the ldo output voltages can be programmed via the i 2 c compatible serial interface. strobing ldo_sel high-to-low resets the contents of the ldo output voltage registers to their default (por) values and forces all outputs to 0 (zero) volt. 8 agnd analog ground. connect agnd to pgnd at a single point as close to the aat2860-x as possible. 9 ldoc ldoc regulated voltage output. ldoc is the voltage output of ldoc. bypass ldoc to agnd with a 2.2 f or larger ceramic capacitor as close to the aat2860-x as possible. 10 ldob ldob regulated voltage output. ldob is the voltage output of ldob. bypass ldob to agnd with a 2.2 f or larger ceramic capacitor as close to the aat2860-x as possible. 11 in input power pin for all three ldos. connect pin 11 to pin 23 with as short a pcb trace as practical. bypassing this pin with a separate 4.7f or larger ceramic capacitor will improve performance. 12 ldoa ldoa regulated voltage output. ldoa is the voltage output of ldoa. bypass ldoa to agnd with a 2.2 f or larger ceramic capacitor as close to the aat2860-x as possible. 13 bl1 backlight led 1 current sink/channel. bl1 controls the current through backlight led 1. connect the cathode of backlight led 1 to bl1. if not used, connect bl1 to out. 14 bl2 backlight led 2 current sink/channel. bl2 controls the current through backlight led 2. connect the cathode of backlight led 2 to bl2. if not used, connect bl2 to out. 15 bl3 backlight led 3 current sink/channel. bl3 controls the current through backlight led 3. connect the cathode of backlight led 3 to bl3. if not used, connect bl3 to out. 16 bl4 backlight led 4 current sink/channel. bl4 controls the current through backlight led 4. connect the cathode of backlight led 4 to bl4. if not used, connect bl4 to out. 17 bl5 backlight led 5 current sink/channel. bl5 controls the current through backlight led 5. connect the cathode of backlight led 5 to bl5. if not used, connect bl5 to out. 18 bl6 (fl1) aat2860-1/2/3/5/6: backlight led 6 current sink/channel. bl6 controls the current through backlight led 6. connect the cathode of backlight led 6 to bl6. if not used, connect bl6 to out. aat2860-4: flash led 1 current sink. fl1 controls the current through flash led 1. connect the cathode of flash led 1 to fl1. if not used, connect fl1 to out. 19 bl7 (fl2) aat2860-1/5/6: backlight led 7 current sink/channel. bl7 controls the current through backlight led 7. con- nect the cathode of backlight led 7 to bl7. if not used, connect bl7 to out. aat2860-2/3/4: flash led or flash led 2 current sink. fl2 controls the current through flash led 2. connect the cathode of flash led 2 to fl2. if not used, connect fl2 to out. 20 pgnd power ground. connect pgnd to agnd at a single point as close to the aat2860-x as possible. 21 c2- negative terminal of charge pump capacitor 2. 22 c1- negative terminal of charge pump capacitor 1. 23 in power input. connect in to the input source voltage. bypass in to pgnd with a 4.7 f or larger ceramic capacitor as close to the aat2860-x as possible. 24 c1+ positive terminal of charge pump capacitor 1. connect the 1 f charge pump capacitor 1 from c1+ to c1-. ep exposed paddle (bottom) connect to pgnd/agnd as close to the aat2860-x as possible.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 3 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 3 www.analogictech.com pin configuration tqfn34-24 (top view) 1 2 3 4 17 16 15 14 24 23 22 21 5 6 8 9 10 11 19 18 13 12 20 7 out c2+ sda scl led_sel fl_lvl ldo_sel bl7/fl2 bl6/fl1 bl5 bl4 bl3 bl2 bl1 ldoa in ldob ldoc agnd pgnd c2- c1- in c1+ part number descriptions 1 part number backlight led outputs flash led outputs main sub aat2860-1 7/4 0/3 0 aat2860-2 6/4 0/2 1 aat2860-3 6/5 0/1 1 aat2860-4 5/4 0/1 2 aat2860-5 7/6 0/1 0 aat2860-6 7/5 0/2 0 absolute maximum ratings 2 symbol description value units in, out, bl1, bl2, bl3, bl4, bl5, bl6/fl1, bl7/fl2 voltage to agnd -0.3 to 6.0 v c1+, c2+, sda, scl voltage to agnd -0.3 to v out + 0.3 v ldoa, ldob, ldoc, led_sel, fl_lvl, ldo_lvl, c1-, c2- voltage to agnd -0.3 to v in + 0.3 v pgnd voltage to agnd -0.3 to 0.3 v t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c thermal information 3, 4 symbol description value units p d maximum power dissipation 2.0 w ja maximum thermal resistance 50 c/w 1. backlight and flash configuration within a part number is configured though the i 2 c serial interface. for example, clearing the meqs flag (set to ?0?) in the aat2860-1?s reg2 register will configure bl1-bl4 led outputs as main and bl5-bl7 outputs as sub. 2. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at co nditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 3. derate 20 mw/c above 25c ambient temperature. 4. mounted on a fr4 circuit board.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 4 2860.2008.05.1.0 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 4 2860.2008.05.1.0 www.analogictech.com electrical characteristics 1 v in = 3.6v; c in = 4.7f; c out = c ldo(a, b, c) = 2.2 f; c1 = c2 = 1f; t a = -40c to +85c, unless otherwise noted. typical values are t a = 25c. symbol description conditions min typ max units v in in operating voltage range 2.7 5.5 v i in in operating current led_sel = in, ldo_sel = fl_lvl = agnd; addr = 02 h , data = 4c h 0.65 ma 2x mode; led_sel = in, fl_lvl = ldo_ sel = agnd; bl1-bl7 = open 5.5 ma 2x mode; led_sel = in, fl_lvl = in; ldo_sel = agnd; fl1-fl2 = open 5.5 ma led_sel = fl_lvl = agnd, ldo_sel = in; addr = 01 h ; data = 0e h ; no load 220 a i in(shdn) in shutdown current led_sel, ldo_sel, fl_lvl = agnd 1.0 a t sd over-temperature shutdown threshold 140 ? c t sd(hys) over-temperature shutdown hysteresis 15 ? c charge pump section v in(th_h, bl) bl1-bl7 charge pump mode transition hysteresis led_sel = in, addr = 02 h , data = 6c h ; fl_lvl = agnd, ldo_sel = agnd 0.15 v v in(th_h, fl) fl1-fl2 charge pump mode transition hysteresis 1v f osc charge pump oscillator frequency t a = 25c 1 mhz t cp(ss) charge pump soft-start time t a = 25c 100 s bl1-bl5, bl6/fl1, bl7/fl2 led drivers t led(su) led output current start-up time out: 0v to in 20 s i blx bl1-bl7 current accuracy led_sel = in, addr=02 h , data=6c h ; v in ? v f = 1v; fl_lvl = ldo_sel = agnd 27 30 33 ma i bl_(dat- a7dh) bl1-bl7 current accuracy led_sel = in, addr=02 h , data=7d h ; v in ? v f = 1v; fl_lvl = ldo_sel = agnd 2.55 3 3.45 ma i (blx) / i bl(avg) bl1-bl7 current matching 2 led_sel = in, addr=02 h , data=6c h ; v in ? v f = 1v; fl_lvl = ldo_sel = agnd 3% v bl_(th) bl1-bl7 charge pump transition threshold led_sel = in, addr=02 h , data=60 h , v in ? v f = 1v; fl_lvl = ldo_sel = agnd 0.18 v t fade bl1-bl7 automatic fade out timer led_sel = in, addr=02 h , data=6c h ; v in ? v f = 1v; fl_lvl = ldo_sel = agnd 1s i fl[1/2] fl1, fl2 current accuracy, -4 option led_sel = fl_lvl = in, addr=04h, data=03h; v in - v f = 1v, ldo_sel = agnd 270 300 330 ma i fl[1/2] fl1, fl2 current accuracy, -4 option led_sel = fl_lvl = in, addr = 04h, data=60h; v in - v f = 1v, ldo_sel = agnd 54 60 66 ma i fl2 fl2 current accuracy, -2 and -3 options led_sel = fl_lvl = in, addr = 04h, data=03h; vin - vf = 1v, ldo_sel= agnd 540 600 660 ma i fl2 fl2 current accuracy, -2 and -3 options led_sel = fl_lvl = in, addr = 04h, data=60h; vin - vf = 1v, ldo_sel = agnd 108 120 132 ma 1. the aat2860 is guaranteed to meet performance specifications over the -40c to +85c operating temperature range and is assu red by design, characterization, and correla- tion with statistical process controls . 2. current matching is defined as the deviation of any sink/channel current from the average of all active channels .
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 5 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 5 www.analogictech.com electrical characteristics 1 v in = 3.6v; c in = 4.7f; c out = c ldo(a, b, c) = 2.2 f; c1 = c2 = 1f; t a = -40c to +85c, unless otherwise noted. typical values are t a = 25c. symbol description conditions min typ max units ldo regulators v ldo[a/b/c] / v ldo[a/b/c] ldoa, ldob, ldoc output voltage tolerance i ldo = 1ma to 300ma; t a = 25c -1.5 +1.5 % i ldo = 1ma to 300ma; t a = -40c to +85c -3 +3 % i ldo[a/b/c](max) ldoa, ldob, ldoc maximum load current 300 ma v ldo[a/b/c](do) ldoa, ldob, ldoc dropout voltage 2 v ldo[a/b/c] 2.7v; i ldo = 150ma 75 150 mv ? v ldo / v ldo * ? v in line regulation v in = (v ldo[a/b/c] + 1v) to 5v 0.09 %/v psrr [a/b/c] ldoa, ldob, ldoc power supply rejection ratio i ldo[a/b/c] =10ma, 1khz 40 db r ldo_(dchg) ldoa, ldob, ldoc auto- discharge resistance 20 i 2 c logic and control interface v il sda, scl, led_sel, fl_lvl, ldo_sel input low threshold 2.7v v in 5.5v 0.4 v v ih sda, scl, led_sel, fl_lvl, ldo_sel input high threshold 2.7v v in 5.5v 1.4 v i in sda, scl, led_sel, fl_lvl, ldo_sel input leakage current sda = scl = led_sel = fl_lvl = ldo_sel = 5v -1 1 a f scl scl clock frequency 0 400 khz t low scl clock low period 1.3 s t high scl clock high period 0.6 s t hd_sta hold time start condition 0.6 s t su_sta setup time for repeat start 0.6 s t su_dat sda data setup time 500 ns t hd_dat sda data hold time 0.5 s t su_sto setup time for stop condition 0.6 s t buf bus free time between stop and start conditions 1.3 s 1. the aat2860 is guaranteed to meet performance specifications over the -40c to +85c operating temperature range and is assu red by design, characterization, and correla- tion with statistical process controls . 2. v do[a/b/c] is defined as v in ? ldo[a/b/c] when ldo[a/b/c] is 98% of nominal.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 6 2860.2008.05.1.0 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 6 2860.2008.05.1.0 www.analogictech.com i 2 c compatible interface timing details t t t t t t t t t
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 7 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 7 www.analogictech.com typical characteristics backlight mode efficiency vs. input voltage input voltage (v) efficiency (%) 2.7 3.1 3.5 3.9 5.5 5.1 4.7 4.3 30 40 50 60 70 80 90 100 30ma/ch, v f = 3.95v 15ma/ch, v f = 3.5v 4.2ma/ch, v f = 3.4v flash efficiency vs. input voltage input voltage (v) efficiency (%) 30 40 50 60 70 80 90 100 2.7 3.1 3.5 3.9 4.3 4.7 5.5 5.1 160ma/ch, v f = 3.15v 320ma/ch, v f = 3.25v backlight current matching vs. temperature (v in = 3.6v; 30ma/channel) temperature (c) backlight output current (ma) -40 -15 10 35 60 85 25 26 27 28 29 30 31 32 33 channel 1 - channel 5/6/7 charge pump output turn-on characteristic (v in = 3.6v; 0ma/channel; c out = 2.2v) time (20s/div) v led_sel (top) (v) charge pump v out (bottom) (v) 0 2 4 0 1 2 3 4 flash mode turn-on characteristic (v in = 4.2v; 300ma/channel; 1x mode) time (20s/div) v flx (2v/div) v fl_lvl (2v/div) v out (2v/div) i in (200ma/div) 0 2 4 0 200 400 600 0 2 4 flash mode turn-on characteristic (v in = 3.6v; 300ma/channel; 1.5x mode) time (50s/div) v flx (2v/div) v fl_lvl (2v/div) v out (2v/div) i in (200ma/div) 0 2 4 0 200 400 600 0 2 4
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 8 2860.2008.05.1.0 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 8 2860.2008.05.1.0 www.analogictech.com typical characteristics flash mode turn-on characteristic (v in = 2.8v; 300ma/channel; 2x mode) time (50s/div) v flx (2v/div) v fl_lvl (2v/div) v out (2v/div) i in (200ma/div) 0 2 4 0 200 400 600 0 2 4 backlight mode turn-on characteristic (v in = 4.6v; 30ma/channel; 1x mode) time (100s/div) v blx (2v/div) v sda (2v/div) v out (2v/div) i in (100ma/div) 0 2 4 0 100 200 4 2 0 backlight mode turn-on characteristic (v in = 3.6v; 30ma/channel; 1.5x mode) time (100s/div) v blx (2v/div) v sda (2v/div) v out (2v/div) i in (200ma/div) 0 2 4 0 200 400 4 2 0 backlight mode turn-on characteristic (v in = 3.2v; 30ma/channel; 2x mode) time (100s/div) v blx (2v/div) v sda (2v/div) v out (2v/div) i in (200ma/div) 0 2 4 0 200 400 4 2 0 backlight mode turn-off characteristic (v in = 3.6v; 30ma/channel; 1.5x mode) time (200s/div) v sda (2v/div) v diode (2v/div) i in (2ma/div) 0 2 0 2 4 0 2 4 operating characteristic ( 30ma/channel backlight; 1.5x mode; v in = 3.6v; c out = 2.2f) time (500ns/div) v in (ac coupled) (top) (mv) charge pump v out (ac coupled) (bottom) (mv) 0 10 20 -50 0 50 100
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 9 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 9 www.analogictech.com typical characteristics operating characteristic ( 30ma/channel backlight; 2x mode; v in = 3.2v; c out = 2.2f) time (500ns/div) v in (ac coupled) (top) (mv) charge pump v out (ac coupled) (bottom) (mv) 0 10 20 -20 -10 0 10 20 ldos a/b/c load regulation (v in = 3.6v) load current (ma) ldo output voltage deviation (%) -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 0.1 1 10 100 1000 v ldo = 3.0v v ldo = 1.5v ldo output voltage vs temperature (v in = 3.6v; i ldo = 0ma) temperature (c) ldo output voltage deviation (%) -1.5 -1 -0.5 0 0.5 1 1.5 -40 -15 60 85 35 10 v ldo = 3.0v v ldo = 1.5v ldos a/b/c line regulation (i ldo = 10ma) input voltage (v) ldo output voltage deviation (%) -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.7 4.3 5.1 5.5 4.7 3.9 3.5 3.1 v ldo = 3.0v v ldo = 1.5v ldos a/b/c load transient response ( i ldo = 10ma to 200ma; v in = 3.6v; v ldo = 1.8v; c ldo = 2.2f) time (20s/div) i ldo (top) (ma) v ldo (bottom) (v) 0 100 200 1.60 1.70 1.80 1.90 2.00 ldos a/b/c line transient response ( v in = 3.6v to 4.2v; i ldo = 10ma; v ldo = 1.8v; c ldo = 2.2f) time (1ms/div) v in (top) (v) v ldo (bottom) (v) 3.6 4.0 4.4 1.78 1.79 1.80 1.81 1.82
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 10 2860.2008.05.1.0 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 10 2860.2008.05.1.0 www.analogictech.com typical characteristics ldos a/b/c turn-on characteristic ( v ldo = 3.0v; v in = 3.6v; c ldo = 2.2f) time (20s/div) v sda (top) (v) v ldo (bottom) (v) 0 2 4 0 1 2 3 4 ldos a/b/c turn-on characteristic ( v ldo = 1.5v; v in = 3.6v; c ldo = 2.2f) time (20s/div) v sda (top) (v) v ldo (bottom) (v) 0 2 4 0.0 0.5 1.0 1.5
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 11 www.analogictech.com functional description the aat2860-x is a highly integrated backlight and photo-flash driver with three ldo regulators. the charge pump led driver powers the backlight and flash leds from the 2.7v to 5.5v input voltage. the ldo regulators get their power from the same input and produce regu- lated output voltage between 1.5v and 3.0v. control of the leds and the ldo output voltage is through an i 2 c compatible serial interface for easy programming. led drivers the aat2860-x drives up to seven backlight leds up to 31ma each and up to two flash leds up to 300ma each. the leds are driven from a charge pump to insure that constant current is maintained over the entire battery voltage range. the charge pump automatically switches from 1x, 1.5x, and 2x modes and back to maintain the led current while minimizing power loss for high effi- ciency. the charge pump operates at the high 1mhz switching frequency allowing the use of small 1 f ceram- ic fly capacitors. the charge pump is controlled by the voltage across the led current sinks. when any one of the active backlight current sink sink/channel voltages drops below 180mv or the flash current sink/channel drops below 450mv, the charge pump goes to the next higher mode (from 1x to 1.5x or from 1.5x to 2x mode) to maintain sufficient led voltage for constant led current. the aat2860-x continuously monitors the led forward voltages and uses the input voltage to determine when to reduce the charge pump mode for better efficiency. there is also a 150mv mode-transition hysteresis that prevents the charge pump from oscillating between modes. led current control both the backlight and flash led currents are controlled through an i 2 c compatible serial interface. the backlight led current can be set between 0.5ma and 31ma in 1ma steps while the flash led current can be set between 0ma and 300ma in 20ma steps. the backlight led currents match to within 3% while the flash led currents match to within 5%. to eliminate the latency of the i 2 c compatible serial interface, the flash led is enabled through a dedicated input, fl_lvl. the aat2860-x also include a safety timer that prevents overstress of the flash led(s). this is important because many flash leds operate for a brief period beyond their steady-state operating limitations. if the flash driving hardware and/or software fails to turn functional block diagram bl5 1x/1.5x/2x tri-mode charge pump c1- c1+ c2- c2+ in ldoa out bl1 bl2 bl3 bl4 bl6/fl1 control logic bl7/fl2 agnd led_sel ldo_sel ldob ldoc in fl_lvl sda scl pgnd ref 7 aat2860-x
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 12 2860.2008.05.1.0 www.analogictech.com the led off, the safety timer insures that the led or other circuitry is not damaged. both the backlight and flash led currents are programmed through the i 2 c compatible serial interface as are the backlight fade timer, the flash safety timer, and the torch/ flash inhibit current levels. see the ?i 2 c compatible serial interface? section of this datasheet for more information on setting the led currents. to enable the flash led(s), strobe both led_sel and fl_lvl inputs low-to-high. as long as fl_lvl signal is held high, the flash led remains on unless it is on longer than the safety timer period. if this occurs, the flash led is turned off. ldo regulators the aat2860-x family include three ldo regulators. these regulators are powered from the battery and produce a fixed output voltage set through the i 2 c compatible serial interface. the output voltage can be set to one of 16 out- put voltages between 1.5v and 3.0v. the ldos can also be turned on/off through the i 2 c compatible serial interface. the ldo regulators require only a small 2.2 f ceramic output capacitor for stability. if improved load transient response is required, larger-valued capacitors can be used without stability degradation. i 2 c compatible serial interface the aat2860-x uses an i 2 c serial interface to set the led currents, the flash timer period, the ldo on/off and out- put voltage, as well as other housekeeping functions. the i 2 c interface takes input from a master device while the aat2860-x acts as a target to the master. the i 2 c protocol uses two open-drain inputs; sda (serial data line) and scl (serial clock line). both inputs require an external pull up resistor, typically to the input voltage. the i 2 c protocol is bidirectional and allows target devices and masters to both read and write to the bus. aat2860 only supports the write protocol and therefore the read/write bit must always be set to ?0?. the timing diagram in figure 1 below shows the typical transmission protocol. i 2 c compatible serial interface protocol the i 2 c compatible serial interface protocol is shown in figure 1. devices on the bus can be either master or target devices. both master and target devices can both send and receive data over the bus, with the difference being that the master device controls all communication on the bus. the aat2860-x acts as a target device on the bus and is only capable of receiving data and does not transmit data over the bus. the i 2 c communications begin with the master generat- ing a start condition. next, the master transmits the 7-bit device address and a read/write bit. each target device on the bus has a unique address. if the address transmitted by the master matches the device address, the target device transmits an acknowledge (ack) signal to indicate that it is ready to receive data. since the aat2860-x only reads from the master, the read/write bit must be set to ?0?. next, the master transmits an 8-bit register address, and the target device transmits an ack to indicate that it has received the register address. next, the master transmits an 8-bit data word, and again the target device transmits an ack indicating that it has received the data. this process continues until the master is finished writing to the target device at which time the master generates a stop condition. start and stop conditions start and stop conditions are always generated by the master. prior to initiating a start, both the sda and scl pin are active. as shown in figure 2, a start condition is when the master pulls the sda line low and, after the start condition hold time (t hd_sta ), the master strobes the scl line low. a start condition acts as a signal to devices on the bus that the device producing the start condition is active and will be communicating on the bus. scl sda start w stop ack ack ack aat 2860 device address 0x60 address = 02 h data = 40h figure 1: typical i 2 c timing diagram.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 13 www.analogictech.com a stop condition, as shown in figure 2, is when scl changes from low to high followed after the stop condi- tion setup time (t su_sto ), by the sda low-to-high transi- tion. the master does not issue an ack and releases both the scl and sda line. transferring data addresses and data are sent with the most significant bit transmitted first and the least significant bit transmitted last. after each address or data transmission, the target device transmits an ack signal to indicate that it has received the transmission. the ack signal is generated by the target after the master releases the sda data line by driving the sda data line low. i 2 c serial programming registers the aat2860?s i 2 c programming registers are listed in table 1. there are six registers, two for backlight led configuration/control, one for flash/lamp led configura- tion/control, and two registers to control the three ldos. for the remainder of this document the superscript " 1 " signifies the power on reset (por) value of a register, the superscript " 2 " signifies the default value of "1" for a par- ticular bit of a register, and the superscript " 3 " signifies "don't care" or "reserved." ldo control registers, reg0 and reg1 configuring and controlling the aat2860-x?s three ldo regulators is performed by applying a low-to-high strobe on the ldo_sel pin and then programming registers reg0 and reg1 over the i 2 c compatible interface. two 4-bit nibbles in reg0 set the output voltages for ldoa and ldob to one of 16 levels. in reg1, the most-signif- icant nibble programs ldoc?s output voltage while the least-significant 4-bit nibble controls each ldo?s on/off status. upon power-on reset (por), all three ldo out- puts are held to 0v or agnd. the programmed ldo output voltage will only appear after writing a ?1? to each or all reg1[d3:d1] locations. if a high-to-low tran- sition is applied to the ldo_sel pin, all three ldo out- puts are forced to 0v and the register contents are reset to their por values. the available ldo output voltages are shown in table 2. d7 d6 d5 d4 d3 d2 d1 d0 reg0 ldoa[3] ldoa[2] ldoa[1] loda[0] ldob[3] ldob[2] ldob[1] lodb[0] reg1 ldoc[3] ldoc[2] ldoc[1] lodc[0] enldo_c enldo_b enldo_a x 3 reg2 x 3 meqs 2 main_on wm[4] wm[3] wm[2] wm[1] wm[0] reg3 floor[1] floor[0] sub_on ws[4] ws[3] ws[2] ws[1] ws[0] reg4 f_hi[3] 2 f_hi[2] 2 f_hi[1] f_hi[0] f_time[1] f_time[0] f_lo[1] 2 f_lo[0] 2 reg5 x 3 x 3 x 3 x 3 x 3 x 3 nofade_m 2 nofade_s 2 table 1: aat2860-x configuration/control register allocation. ldox[4:0] ldo v out [a/b/c] (v) ldox[4:0] ldo v out [a/b/c] (v) 0000 1 1.5 1 1000 2.3 0001 1.6 1001 2.4 0010 1.7 1010 2.5 0011 1.8 1011 2.6 0100 1.9 1100 2.7 0101 2.0 1101 2.8 0110 2.1 1110 2.9 0111 2.2 1111 3.0 table 2: ldo[a:c] output voltage control data 1. denotes the default (power-on-reset) value. 2. denotes default value is "1" or on. 3. don't care or reserved.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 14 2860.2008.05.1.0 www.analogictech.com t t figure 2: i 2 c stop and start conditions. start: a high 1 to low 0 transition on the sda line while scl is high 1 stop: a low 0 to high 1 transition on the sda line while scl is high 1 figure 3: i 2 c address bit; 7-bit slave address (a6-a0), 1-bit read/write (r/w), 1-bit acknowledge (ack). figure 4: i 2 c register address and data bit map; 8-bit data (d7-d0), 1-bit acknowledge (ack).
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 15 www.analogictech.com bl1-bl7 backlight control registers, reg2, reg3, and reg5 the aat2860-x?s i 2 c registers reg2 and reg3 control the backlight led configuration and output current level in each group of outputs. reg2[d6] (meqs) defines whether all seven led outputs are controlled as a single group (meqs = 1 = por default setting) or are divided into two sets (by writing a ?0? into reg2[d6]) for main/ sub display applications according to the "part number descriptions" table. the default condition for all backlight outputs (bl1-bl5/ bl6/bl7) is off after power-up. if the bl1-bl5/bl6/bl7 outputs are grouped together, reg2 data bit 5 (main_ on) is the on/off control for the group; in this case, reg3[d5] (sub_on register bit) is ignored. in the case of the aat2860-1, setting meqs = 0 after por groups the bl1-bl4 outputs together as main and groups the bl5-bl7 outputs as sub. in this case, reg2[d5] is the on/off control for the main group and reg3[d5] is the on/off control for the sub group. the aat2860-x lmu also provides an internal led current fade function. fade functionality simply allows for the turning on/off of the leds in a smooth controlled transi- tion. the aat2860 does not have to be manually pro- grammed to avoid the abrupt changes in lighting when white led drivers are tuned-on and/or turned-off. the fade-in/fade-out operation occurs only during led on/off transitions. the fade response time is constant regardless of the led current level. this feature is useful in those applications where turning on/off the backlight current using a smooth transition versus an abrupt on-to-off transition is preferred. if meqs = 1(reg2[d6]), then fade will be disabled in all led?s when no_fade_m(reg5[d1]) is written to 1. in this case, the contents of no_ fade_s(reg5[d0]) are ignored. if meqs = 0, then fade can be disabled independently for the main and sub led groups using the bits no_fade_m and no_fade_s. based on the programmed led current level set by wm[4:0] (reg2[d4:d0]) and/or ws[4:0] (reg3[d4:d0]), the aat2860-x increases/decreases linearly from/to the programmed floor (reg3[d7:d6]) level to/from the current level set for the main (reg2[d4:d0]) and sub (reg3[d4:d0]) groups during led on/off transitions. the aat2860-x?s internal fade response time is approxi- mately 1 second. in addition, the aat2860-x provides four settings selectable over the i 2 c interface for the fade function?s led current floor and these settings are illus- trated in table 5. fl1-fl2 flash driver control register reg4 metal-mask options of the base aat2860-x design have been configured for backlight and flash/torch applications. as shown in the "part number descriptions" table, there are three combinations for backlight and flash available in this family: the aat2860-2 (6m+0s+1fl or 4m+2s+1fl), the aat2860-3 (6m+0s+1fl or 5m+1s+1fl), or the aat2860-4 (5m+0s+2fl or 4m+1s+2fl). the configura- tion of the led outputs is controlled by the meqs bit. in all cases, the meqs por default value of ?1? or a user- programmed value of ?0? selects the configuration of the aat2860-2/3/4 according to table 6. in all options, the blx current outputs can be programmed as a single unit (meqs = 1) or configured in a main/sub arrangement with separate current levels between main and sub (meqs = 0). in the case of the aat2860-2/3 options where the meqs bit has been programmed as a ?0,? the bl7 led output is internally re-configured as a single flash/lamp current output, fl. in these options, the maximum available current from the flash output is 600ma (see table 7) and maximum available current for torch or flash inhibit is 120ma (see table 9). for the aat2860-4, the bl6 and the bl7 outputs are internally reconfigured as flash current outputs, fl1 and fl2, respectively, where each flash output is capable of supplying up to 300ma in full-flash mode and up to 60ma in torch mode.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 16 2860.2008.05.1.0 www.analogictech.com d7 d6 d5 d4 d3 d2 d1 d0 reg2 x 3 meqs 2 main_on wm[4] wm[3] wm[2] wm[1] wm[0] reg3 floor[1] floor[0] sub_on ws[4] ws[3] ws[2] ws[1] ws[0] reg5 x 3 x 3 x 3 x 3 x 3 x 3 nofade_m 2 nofade_s 2 table 3: aat2860 bl1-blx backlight control register allocation. wm[4:0], ws[4:0] led current (ma) wm[4:0], ws[4:0] led current (ma) 00000 1 31 1 10000 15 00001 30 10001 14 00010 29 10010 13 00011 28 10011 12 00100 27 10100 11 00101 26 10101 10 00110 25 10110 9 00111 24 10111 8 01000 23 11000 7 01001 22 11001 6 01010 21 11010 5 01011 20 11011 4 01100 19 11100 3 01101 18 11101 2 01110 17 11110 1 01111 16 11111 0.5 table 4: main/sub led current - wm/ws[4:0]. floor[1:0] fade in/out current level (ma) 00 1 0.48 01 0.97 10 1.94 11 2.90 table 5: main/sub led current fade in/out level control. part number meqs bit (reg2 data bit[6]) ?1? (default) ?0? aat2860-2 6m+0s+1fl 4m+2s+1fl aat2860-3 6m+0s+1fl 5m+1s+1fl aat2860-4 5m+0s+2fl 4m+1s+2fl table 6: aat2860-2/3/4 flash driver control register allocation. for each one of the three options in table 6, setting/pro- gramming the bits in reg4 (see table 7) sets the full- scale flash current, the torch current levels, and flash safety time duration. the most-significant 4-bit nibble (reg1[d7:d4], or f_hi[3:0]) of the 8-bit data word sets the full-scale flash led current, the middle two bits (reg4[d3:d2], or f_time[1:0]) set the flash safety dura- tion, and the last two bits (reg4[d1:d0], or f_lo[1:0]) are used to set the torch current level. 1. denotes default (power-on-reset) value. 2. denotes default value is "1" or on. 3. don't care or reserved.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 17 www.analogictech.com d7 d6 d5 d4 d3 d2 d1 d0 reg4 f_hi[3] 2 f_hi[2] 2 f_hi[1] f_hi[0] f_time[1] f_time[0] f_lo[1] 2 f_lo[0] 2 table 7: aat2860-x flash/torch control register allocation. f_hi[3:0] flash current (ma) per output aat2860-2 or -3 aat2860-4 0000 600 300 0001 560 280 0010 520 260 0011 480 240 0100 440 220 0101 400 200 0110 360 180 0111 320 160 1000 280 140 1001 240 120 1010 200 100 1011 160 80 1100 1 120 1 60 1 1101 80 40 1110 40 20 1111 off off table 8: flash led current register, f_hi[3:0]. f_time[1:0] flash time (sec) 00 1 2 1 01 1 10 0.5 11 always on table 9: flash safety timer data, f_time[1:0]. f_lo[1:0] total output torch current (ma) aat2860-2 or -3 aat2860-4 00 120 60 01 80 40 10 40 20 11 1 0 1 0 1 table 10: torch data, f_lo[1:0]. applications information led selection the aat2860-x is specifically intended for driving white leds. however, the device design will allow the aat2860-x to drive most types of leds with forward voltage specifi- cations ranging from 2.0v to 4.7v. led applications may include mixed arrangements for display backlighting, color (rgb) leds, infrared (ir) diodes and any other load needing a constant current source generated from a vary- ing input voltage. since the bl1 to bl5/bl6(fl1)/ bl7(fl2) constant current sinks/channels are matched with negligible voltage dependence, the constant current channels will be matched regardless of the specific led forward voltage (v f ) levels. the current sinks/channels in the aat2860-x maximize performance and make it capable of driving leds with high forward voltages. multiple channels can be combined to obtain a higher led drive current without complication. device switching noise performance the aat2860-x operates at a frequency of approximate- ly 1mhz to control noise and limit harmonics that can interfere with the rf operation of cellular telephone handsets or other communication devices. the aat2860-x soft-start feature prevents noise transient effects associ- ated with in-rush currents during the start up of the charge pump circuit. power efficiency and device evaluation charge-pump efficiency discussion in the following sec- tions accounts only for the efficiency of the charge pump section itself. due to the unique circuit architecture and design of the aat2860-x, it is very difficult to measure efficiency in terms of a percent value comparing input power over output power. 1. denotes the default (power-on-reset) value. 2. denotes default value is "1" or on.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 18 2860.2008.05.1.0 www.analogictech.com since the aat2860-x outputs are pure constant current sinks and typically drive individual loads, it is difficult to measure the output voltage for a given output (bl1 to bl5, bl6/fl1, and bl7/fl2) to derive an overall output power measurement. for any given application, white led forward voltage levels can differ, yet the output drive current will be maintained as a constant. this makes quantifying output power a difficult task when taken in the context of comparing to other white led driver circuit topologies. a better way to quantify total device efficiency is to observe the total input power to the device for a given led current drive level. the best white led driver for a given application should be based on trade-offs of size, external component count, reliability, operating range and total energy usage... not just ?% efficiency?. the aat2860-x efficiency may be quantified under very specific conditions and is dependent upon the input volt- age versus the output voltage seen across the loads applied to outputs bl1 through bl5, bl6(fl1), and bl7(fl2) for a given constant current setting. depending on the combination of v in and voltages sensed at the current sinks/channels, the device will operate in ?load switch? mode. when any one of the voltages sensed at the current sinks/channels nears dropout the device will operate in 1.5x or 2x charge pump mode. each of these modes will yield different efficiency values. one should refer to the following two sections for explanations for each operational mode. device power efficiency the aat2860?s charge pump conversion efficiency is defined as the power delivered to the white led load divided by the input power: = = p leds p in v led1 i led1 + ... + v ledx i ledx v in i in v ledx = white led forward voltage (v f ) i ledx = white led bias current (i d ) x = number of white leds the expression to define the estimated ideal efficiency ( ) for the aat2860 in 1x mode is as follows: = = p leds p in v led1 i led1 + ... + v ledx i ledx v in i in the aat2860?s charge pump is a fractional charge pump which will boost the input supply voltage in the event where v in is less then the required output voltage across the backlight white led load. the efficiency can be simply defined as a linear voltage regulator with an effective backlight white led forward voltage that is equal to one and a half (1.5x mode) times the input voltage. with an ideal 1.5x charge pump, the input current is 1.5x of the output current. the expression to define the estimated ideal efficiency ( ) for the aat2860 in 1.5x mode is as follows: = = p leds p in v led1 i led1 + ... + v ledx i ledx v in i in the same calculations apply for the aat2860 in 2x mode where for an ideal 2x charge pump, the input current is 2x of the output current. the expression for the esti- mated ideal efficiency ( ) for the aat2860 in 2x mode is as follows: = = p leds p in v led1 i led1 + v led2 i led2 v in i in
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 19 www.analogictech.com capacitor selection careful selection of the eight external capacitors c in , c1, c2, c ldo(a/b/c) , and c out are important because they will affect turn on time, output ripple and transient perfor- mance. optimum performance will be obtained when low esr (<100m ? ) ceramic capacitors are used. in general, low esr is defined as a resistance that is less than 100m ? . x7r and x5r type ceramic capacitors are highly recom- mended over all other types of capacitors for use with the aat2860. for the charge pump section, a 1f or greater capacitor is required for the fly (c1 and c2) capacitors. the three ldos require a 2.2f or greater output capacitor. the required input capacitor (c in ) is 4.7 f or greater and the required output capacitor (c out ) is 2.2 f or greater. ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. a ceramic capacitor typically has very low esr, is lowest cost, has a smaller printed circuit board (pcb) footprint, and is non-polarized. low esr ceramic capacitors maxi- mize charge pump transient response. before choosing a particular capacitor, verify the capaci- tor?s performance with the characteristics illustrated in the component?s data sheet. performance verification will help avoid undesirable component related perfor- mance deficiencies. suggested typical ceramic capacitor components for the aat2860 are listed in table 11. pcb layout to achieve adequate electrical and thermal performance, careful attention must be given to the pcb layout. in the worst-case operating condition, the chip must dissipate considerable power at full load. adequate heat-sinking must be achieved to ensure intended operation. figures 6 and 7 illustrate an example pcb layout. the bottom of the package features an exposed metal pad. the exposed pad acts, thermally, to transfer heat from the chip and, electrically, as a ground connection. the junction-to-ambient thermal resistance ( ja ) for the connection can be significantly reduced by following a couple of important pcb design guidelines. the pcb area directly underneath the package should be plated so that the exposed paddle can be mated to the top layer pcb copper during the reflow process. multiple copper plated thru-holes should be used to electrically and thermally connect the top surface pad area to additional ground plane(s). the chip ground is internally connected to both the exposed pad and to the agnd and pgnd pins. it is good practice to connect the gnd pins to the exposed pad area with traces. the flying capacitors (c1 and c2), input capacitors (c3 and c4), and output capacitor (c5, c6, c7, and c8) should be connected as close as possible to the ic. in addition to the external passive components being placed as close as possible to the ic, all traces connect- ing the aat2860 should be as short and wide as possible to minimize path resistance and potential coupling. manufacturer part number value voltage temp. co. case avx 0603zd105k 1 f10 x5r 0603 0603zd225k 2.2 f10 tdk c1608x5r1e105k 1 f25 x5r 0603 c1608x5r1c225k 2.2 f16 c1608x5r1a475k 4.7 f10 murata grm188r61c105k 1 f16 x5r 0603 grm188r61a225k 2.2 f10 taiyo yuden lmk107bj475ka 4.7 f 10 x5r 0603 table 11: surface mount capacitors.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 20 2860.2008.05.1.0 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 20 2860.2008.05.1.0 www.analogictech.com c1 c2 c3 c4 d1 d2 d3 d4 out c5 dc+ r4 vdd 1 gp5 2 gp4 3 gp3 4 gp2 5 gp1 6 gp0 7 vss 8 pic12f675 u3 c9 r6 red led 7 sw2 sw3 flash dc+ dc+ r1 r2 r3 sda r5 df1 df2 sw1 c6 scl vcc 1 out2 2 out1 3 en/ set 4 gn d 5 out5 6 out4 7 out3 8 aat 4296 u2 out 1 c2+ 2 sda 3 scl 4 led _sel 5 fl_lvl 6 ldo _sel 7 agnd 8 ldoa 9 ldob 10 in 11 ldoc 12 bl 1 13 bl 2 14 bl 3 15 bl 4 16 bl 5 17 bl 6/fl1 18 bl7/fl2 19 pgnd 20 c2- 21 c1- 22 in 23 c1+ 24 aat 2860 -x u1 d5 d6 d7 c7 c8 dc+ sda scl in in r8 r7 dc+ dc+ figure 5: aat2860 evaluation board schematic.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 21 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 21 www.analogictech.com figure 6: aat2860 evaluation board top-side view layout. figure 7: aat2860 evaluation board bottom-side view layout.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 22 2860.2008.05.1.0 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 22 2860.2008.05.1.0 www.analogictech.com ordering information package marking 1 part number (tape and reel) 2 tqfn34-24 1gxyy aat2860imk-1-t1 tqfn34-24 1wxyy AAT2860IMK-2-T1 tqfn34-24 aat2860imk-3-t1 tqfn34-24 aat2860imk-4-t1 tqfn34-24 aat2860imk-5-t1 tqfn34-24 aat2860imk-6-t1 all analogictech products are offered in pb-free packaging. the term pb-free means semiconductor products that are in compliance with current rohs standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. for more information, please visit our website at http://www.analogictech.com/about/quality.aspx. package information tqfn34-24 3 3.000 0.050 4.000 0.050 top view bottom view side view detail a 1.700 0.050 detail a r(5x) index area (d/2 x e/2) 0.210 0.040 2.700 0.050 0 + 0.10 - 0.00 0.750 0.050 0.203 ref 0.400 bsc 0.400 0.050 all dimensions in millimeters. 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . 3. the leadless package family, which includes qfn, tqfn, dfn, tdfn, and stdfn, has exposed copper (unplated) at the end of th e lead terminals due to the manufacturing process. a solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder c onnection.
aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 23 www.analogictech.com aat2860 backlight/flash led driver and multiple ldo lighting management unit chargepump tm product datasheet 2860.2008.05.1.0 23 www.analogictech.com advanced analogic technologies, inc. 3230 scott boulevard, santa clara, ca 95054 phone (408) 737-4600 fax (408) 737-4611 ? advanced analogic technologies, inc. analogictech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an analogictech pr oduct. no circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. analogictech reserves the right to make changes to their products or speci cations or to discontinue any product or service without notice. except as provided in analogictech?s terms and conditions of sale, analogictech assumes no liability whatsoever, and analogictech disclaims any express or implied warranty re lating to the sale and/or use of analogictech products including liability or warranties relating to tness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right . in order to minimize risks associated with the customer?s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. testing and other quality control techniques are utilized to the extent analogictech deems necessary to support this warranty. speci c testing of all parameters of each device is not necessarily performed. analogictech and the analogictech logo are trademarks of advanced analogic technologies incorporated. all other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.

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