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AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 3351.2009.02.1.0 1 www.analogictech.com general description the AAT3351 is a low-noise, constant-frequency charge pump dc/dc converter that uses a dual-mode load switch (1x) and fractional (1.5x) charge pump to maxi- mize efficiency for white led applications. AAT3351 is capable of driving 4 white leds at a total of 120ma from single 2.7v to 5.5v input. the current sinks may be operated individually or in parallel while driving higher- current leds. a low external parts count (two 1 f flying capacitors and two small 1 f capacitors at v in and v out ) makes the AAT3351 ideal for small battery-powered applications. analogic tech?s s 2 cwire? serial digital input is used to enable, disable, and set current to one of 32 levels for the leds. the AAT3351 is equipped with built-in short-circuit pro- tection. the soft-start circuitry prevents excessive inrush current at start-up and mode transitions. the AAT3351 family is available in pb-free, space-saving tsopjw and tdfn33 packages, and operates over the -40c to +85c ambient temperature range. features ? drives up to 4 leds at up to 30ma, each ? automatic switching between 1x and 1.5x modes ? 1mhz switching frequency ? linear led output current control ? single-wire, s 2 cwire interface ? 32-step ? 10% led output current accuracy ? 3% led output current matching ? low-current shutdown mode ? automatic soft-start ? tsopjw-12 and tdfn33-12 packages applications ? cellular and smart phones ? digital still and video cameras ? pdas ? portable devices ? portable media players ? other white led backlighting typical application v battery 3.6v en/set s 2 cwire serial control in en/set c2+ c2- c1+ c1- out d1 d2 d3 gnd c in 1f d1 c1 1f c2 1f d2 d3 d4 c out 1f d4 AAT3351
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 2 3351.2009.02.1.0 www.analogictech.com pin descriptions pin number name function tdfn33-12 tsopjw-12 11 2d 4 backlight led 4 current sink. d4 controls the current through backlight led 4. connect the cathode of backlight led 4 to d4. if not used, connect d4 to out . 2 11 en/set s 2 cwire serial interface control pin. 3 10 c2- negative terminal of charge pump capacitor 2. 4 9 c2+ positive terminal of charge pump capacitor 2. connect the 1 f charge pump capacitor 2 from c2+ to c2-. 5 8 out charge pump output. out is the output of the charge pump and supplies current to the backlight leds. connect the backlight led anodes to out. bypass out to pgnd with a 1 f or larger ceramic capacitor as close to the AAT3351 as possible. 6 7 c1- negative terminal of charge pump capacitor 1. 7 6 c1+ positive terminal of charge pump capacitor 1. connect the 1 f charge pump capacitor 1 from c1+ to c1-. 85i n power input. connect in to the input source voltage. bypass in to gnd with a 1 f or larger ceramic capacitor as close to the AAT3351 as possible. 9 4 gnd ground pin. 10 3 d1 backlight led 1 current sink. d1 controls the current through backlight led 1. connect the cathode of backlight led 1 to d1. if not used, connect d1 to out. 11 2 d2 backlight led 2 current sink. d2 controls the current through backlight led 2. connect the cathode of backlight led 2 to d2. if not used, connect d2 to out. 12 1 d3 backlight led 3 current sink. d3 controls the current through backlight led 3. connect the cathode of backlight led 3 to d3. if not used, connect d3 to out. ep n/a ep exposed paddle (bottom). connect to gnd directly beneath package. pin configuration tsopjw-12 tdfn33-12 (top view) (top view) 1 2 3 4 5 6 12 11 10 9 8 7 d3 d2 d1 gnd in c1+ d4 en/set c2- c2+ out c1- d4 en/set c2- 1 c2+ out c1- d3 d2 d1 gnd in c1+ 2 3 4 5 6 12 11 10 9 8 7
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 3351.2009.02.1.0 3 www.analogictech.com absolute maximum ratings t a = 25c unless otherwise noted. symbol description value units v in input voltage -0.3 to 6 v v out charge pump output -0.3 to 6 v v en/set en/set to gnd voltage -0.3 to 6 v v en/set(max) maximum v en/set to v in voltage (v en/set - v in ) +0.3 v i out maximum dc output current 150 ma t j operating junction temperature range -40 to 150 c thermal information 1 symbol description value units p d maximum power dissipation 1 tdfn33-12 2 2000 mw tsopjw-12 3 625 ja maximum thermal resistance tdfn33-12 50 c/w tsopjw-12 160 1. mounted on 1.6mm thick fr4 circuit board. 2. derate 25mw/c above 25c ambient temperature. 3. derate 6.25mw/c above 25c ambient temperature.
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 4 3351.2009.02.1.0 www.analogictech.com electrical characteristics v in = 3.6v; c in = c out = 1 f; c 1 = c 2 = 1 f; t a = -40c to 85c unless otherwise noted. typical values are t a = 25c. symbol description conditions min typ max units input power supply v in input voltage range -40c t a 85c 2.7 5.5 v i in input operating current en/set = in 1x mode, i d1 = i d2 = i d3 = i d4 = off 24 ma 1.5x mode, i d1 = i d2 = i d3 = i d4 = off 6 7.2 i in(shdn) shutdown current en/set = gnd 1 a v in_(th) charge pump mode hysteresis 1x to 1.5x transition at any i dx 0.15 v led current sink outputs i d_(max) d1-d4 current accuracy en/set = s 2 c data 1 27 30 33 ma i d_(data31) d1-d4 current accuracy en/set = s 2 c data 31 0.5 ma i (d_x) /i d_avg) d1-d4 current matching 1 en/set = s 2 c data 1, i d1 = i d2 = i d3 = i d4 = 30ma 3 % v d_(th) hysteresis for mode change i d1 = i d2 = i d3 = i d4 = 30ma, 1.5x to 1x mode 0.15 0.25 v i out(max) charge pump maximum output current v in = 3.0v, v f = 4.0v 150 ma f osc clock frequency 1 mhz v d_(th) charge pump mode transition threshold en/set = in; v in - v f = 1v 0.15 v t ss charge pump startup time 150 s en/set s 2 cwire control v enh en/set input high threshold voltage 1.4 v v enl en/set input low threshold voltage 0.4 v i en(lkg) en input leakage current en/set = in = 5v -1 1 a t en/set(hi_min) en/set minimum high time 50 ns t en/set(hi_max) en/set maximum high time 75 s t en/set(low) en/set input low time 0.3 75 s t en/set(off) en/set input off timeout 500 s t en/set(lat) en/set input latch timeout 3 500 s 1. led current match is defined as 100 (i dx - i avg )/i avg . 2. 1x mode output impedance is defined as (v in - v out )/i out . 3. if the part has been shut down, the latch time will be 500 s longer for soft start of charge pump.
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 3351.2009.02.1.0 5 www.analogictech.com typical characteristics v in = 3.6v, c in = c out = c 1 = c 2 = 1 f; t a = 25c, unless otherwise noted. no load operating current vs. input voltage (1x mode) input voltage (v) i in (ma) 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 85c 25c 0c -40c no load operating current vs. input voltage (1.5x mode) input voltage (v) i in (ma) 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 0 1 2 3 4 5 6 7 8 85c 25c 0c -40c backlight current matching vs. temperature (30ma/ch) temperature (c) current matching (%) -40 -15 10 35 60 85 0.00 0.10 0.20 0.30 0.40 0.50 0.60 efficiency vs. input voltage (data = 1, 30ma/ch) input voltage (v) efficiency (%) 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 40 55 70 85 100 v f = 3.3v v f = 3.0v v f = 2.7v 1.5x output voltage vs. load current load current (ma) output voltage (v) 0 50 100 150 200 3 3.5 4 4.5 5 5.5 v in = 3.3v v in = 3.6v v in = 4.2v 1.5x mode operating characteristics (v in = 3.3v; 30ma/ch backlight, 1.5x mode, c out = 1f) time (1s/div) v out (ac coupled) (50mv/div) c 1+ (2v/div) c 2+ (2v/div) v in (ac coupled) (20mv/div) 0 0 0 0
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 6 3351.2009.02.1.0 www.analogictech.com typical characteristics v in = 3.6v, c in = c out = c 1 = c 2 = 1 f; t a = 25c, unless otherwise noted. en/set input latch timeout vs. input voltage input voltage (v) t en/set(lat) (s) 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 40 60 80 100 120 140 160 180 -40c 25c 85c en/set input off timeout vs. input voltage input voltage (v) t en/set(off) (s) 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 40 90 140 190 240 290 340 390 440 490 -40c 25c 85c en input high threshold voltage vs. input voltage input voltage(v) v enh (v) 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 0.60 0.70 0.80 0.90 1.00 1.10 1.20 -40c 25c 85c en input low threshold voltage vs. input voltage input voltage (v) v enl (v) 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 0.60 0.70 0.80 0.90 1.00 1.10 1.20 -40c 25c 85c turn-on to 1x mode backlight (v in = 3.6v; 30ma/ch) time (100s/div) v out (2v/div) en (2v/div) v bl (2v/div) i in (200ma/div) 0 0 0 0 turn-on to 1.5x mode backlight (v in = 3.3v; 30ma/ch) time (40s/div) v out (4v/div) en (4v/div) v bl (4v/div) i in (400ma/div) 0 0 0 0
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 3351.2009.02.1.0 7 www.analogictech.com typical characteristics v in = 3.6v, c in = c out = c 1 = c 2 = 1 f; t a = 25c, unless otherwise noted. turn-off from 1.5x mode backlight (v in = 3.3v; 30ma/ch) time (20ms/div) v out (4v/div) en (2v/div) v bl (4v/div) i in (200ma/div) 0 0 0 0
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 8 3351.2009.02.1.0 www.analogictech.com AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 8 3351.2009.02.1.0 www.analogictech.com functional block diagram dual-mode charge pump 1x/1.5x c1+ c1- c2+ c2- d1 out gnd d2 d3 d4 control logic en/set in 32-step s 2 cwire backlight control 4 functional description the AAT3351 is a high efficiency charge pump white leds driver for portable applications which can drive 4 channels at up to 30ma each. the current sink magnitude is controlled by the en/set serial data s 2 cwire interface. the interface records rising edges of the en/set pin and decodes them into 32 indi- vidual current level settings . led drivers the AAT3351 is a fractional charge pump and can multi- ply the input voltage by 1 or 1.5 times. the charge pump switches at a fixed frequency of 1mhz. the internal- mode-selection-circuit automatically switches the mode between 1x and 1.5x mode based on the input voltage, led forward voltage, and load current. this mode switch- ing maximizes the efficiency throughout the entire load range. when the input voltage is high enough, the AAT3351 operates in 1x mode to provide maximum effi- ciency. if the input voltage drops too low to supply pro- grammed led current when the battery discharges and the voltage decays, 1.5x mode is automatically enabled. when the battery is connected to a charger and the input voltage increases sufficiently, the device will switch back to 1x mode. application information current level settings led current level is set via analogictech?s simple serial control (s 2 cwire) interface in a linear scale. the led current decreases linearly with each increasing code in steps of approximately 1ma as shown in table 1 and figure 1. s 2 cwire data led current (ma) s 2 cwire data led current (ma) 1 30 17 14.5 2 29 18 13.5 3 28 19 12.6 4 27.1 20 11.6 5 26.1 21 10.6 6 25.2 22 9.7 7 24.2 23 8.7 8 23.2 24 7.7 9 22.3 25 6.8 10 21.3 26 5.8 11 20.3 27 4.8 12 19.4 28 3.9 13 18.4 29 2.9 14 17.4 30 1.9 15 16.5 31 1 16 15.5 32 0.5 table 1: s 2 cwire data vs. led current.
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 3351.2009.02.1.0 9 www.analogictech.com AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 3351.2009.02.1.0 9 www.analogictech.com 1 en/set 2 n-1 n <= 32 data reg 0 n 0 t hi t lo t lat t off figure 2: en/set timing diagram. en/set serial interface the led current magnitude is controlled by the en/set pin using the s 2 cwire interface. the interface records rising edges of the en/set pin and decodes them into 32 individual current level settings. code 1 is full scale, and code 32 is the lowest setting equal to 500 a. the inter- face resets back to state 1 after the 32nd clock. the en/ set counter can be clocked at speeds up to 1mhz, so intermediate states are not visible, but is designed to accommodate a wide range of data rates. the first rising edge of en/set enables the charge pump, which reaches full capacity after the soft-start time t ss . and initially sets the output led current to full scale. once en/set has been held in the logic high state for time t lat , the pro- grammed current is seen at the current sink outputs. when en/set is held low for an amount of time greater than t off , the AAT3351 enters into shutdown mode and draws less than 1 a from in. the internal data register is reset to 0 during shutdown. the en/set timing dia- gram is shown on figure 2. 0 5 10 15 20 25 30 35 1 2 3 4 5 6 7 8 9 1011121314151617181920212223242526272829303132 s 2 cwire data led current (ma) figure 1: s 2 cwire data vs. led current.
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 10 3351.2009.02.1.0 www.analogictech.com AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 10 3351.2009.02.1.0 www.analogictech.com led selection the AAT3351 is designed to drive white leds with for- ward voltages from 2v to 4.8v. since d1 through d4 output current sinks are matched with negligible voltage dependence; the led constant current and brightness will be matched regardless of their forward voltage (v f ) levels. test current/channel disable each current sink channel is equipped with a test current function. while it is enabled, the AAT3351 automatically detects the presence of leds all the time. unused chan- nels that are tied to out or led loads that are failed will be automatically disabled. device switching noise performance the AAT3351 operates at a fixed frequency of 1mhz to control noise and limit harmonics that can interfere with the rf operation of cellular telephone handsets or other communication devices. noise injected back to the input pin of the charge pump is 20mv peak-to-peak, typically ten times less than inductor-based dc/dc boost con- verter white led backlight solutions. the AAT3351 soft- start feature prevents noise transient effects associated with inrush currents during startup of the charge pump circuit. power efficiency and device evaluation the charge pump efficiency discussion in the following sections accounts only for efficiency of the charge pump section itself. due to the unique circuit architecture and design of the AAT3351, it is very difficult to measure effi- ciency in terms of a percent value comparing input power over output power. since the AAT3351 outputs are pure constant current sinks and typically drive individual loads, it is difficult to measure the output voltage for a given output 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 com- paring 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 components count, reliability, operating range, and total energy usage... not just % efficiency . the AAT3351 efficiency may be quantified under specific conditions and is dependent upon the input voltage and voltage on d1 through d4 for a given constant current setting. depending on the combination of v in and voltages sensed at the current sinks d1-d4, the device will operate in 1x mode. when any one of the voltages sensed at the cur- rent sinks d1-d4 drops below the charge pump mode transient threshold, the device will operate in 1.5x charge pump mode. each of these modes will yield dif- ferent efficiency values. refer to the following two sec- tions for efficiency calculation of each mode. 1x mode efficiency the AAT3351's 1x mode is operational at all times and functions alone to enhance device power conversion effi- ciency when v in is higher than the voltage across the load. when in 1x mode, voltage conversion efficiency is defined as output power divided by input power. an expression for the ideal efficiency ( ) in 1x charge pump mode can be expressed as: -or- 1.5x charge pump mode efficiency the AAT3351 contains a fractional charge pump which will boost the input supply voltage when v in is less than the voltage required to supply the output. the efficiency ( ) can be simply defined as a linear voltage regulator with an effective output voltage that is equal to one and one half times the input voltage. efficiency ( ) for an ideal 1.5x charge pump can be calculated by the follow- ing equation: -or-
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 3351.2009.02.1.0 11 www.analogictech.com AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 3351.2009.02.1.0 11 www.analogictech.com manufacturer part number value ( f) voltage (v) temperature coef cient case murata grm219r71c104ka01 0.1 10 x7r 0805 grm188r61a105ka61 1 10 x5r 0603 grm219r61a475ke19 4.7 10 x5r 0805 avx 0603zd105k 1 10 x5r 0603 tdk c1608x5r1e105k 1 25 x5r 0603 c1608x5r1a475k 4.7 10 x5r 0603 taiyo yuden lmk107bj475ka 4.7 10 x5r 0603 table 2: surface mount capacitors. capacitor selection careful selection of the four external capacitors c in , c 1 , c 2 , and c out is important because they will affect turn-on time, output ripple, and transient load performance. optimum performance will be obtained when low equiva- lent series resistance (esr) ceramic capacitors are used. in general, low esr may be defined as less than 100m . a value of 1 f for all four capacitors is a good starting point when choosing capacitors. if the led current sinks are only programmed for low current levels, then the capacitor size may be decreased. capacitor characteristics ceramic composition capacitors are highly recommended over all other types of capacitors for use with the AAT3351. ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counter- parts. a ceramic capacitor has very low esr, is lowest cost, has a smaller pcb footprint, and is non-polarized. low esr ceramic capacitors help to maximize charge pump transient response. since ceramic capacitors are non-polarized, they are not prone to incorrect connec- tion damage. equivalent series resistance esr is an important characteristic to consider when selecting a capacitor. esr is a resistance internal to a capacitor that is caused by the leads, internal connec- tions, size or area, material composition, and ambient temperature. capacitor esr is typically measured in mil- liohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. ceramic capacitor materials ceramic capacitors less than 0.1 f are typically made from npo or c0g materials. npo and c0g materials have tight tolerance and are stable over temperature. capacitors with large values are typically composed of x7r, x5r, z5u, or y5v dielectric materials. large ceramic capacitors, greater than 2.2 f, are often available in low-cost y5v and z5u dielectrics, but capac- itors greater than 1 f are usually not required for AAT3351 applications. capacitor area is another contributor to esr. capacitors that are physically larger will have lower esr when com- pared to equivalent material but smaller capacitors. these larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller size. evaluation board layout when designing a pcb for the AAT3351, the key require- ments are: 1. place two flying capacitors c 1 and c 2 as close to the chip as possible; otherwise 1.5x mode performance will be compromised. 2. place input and output decoupling caps as close to the chip as possible to reduce switching noise and output ripple.
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 12 3351.2009.02.1.0 www.analogictech.com evaluation board schematic c1 1f c out 1f c6 4.7f r2 20k c in 1f c2 1f r5 1k r4 1k r3 1k jp1 jp5 s2c s1 up s2 down s3 cycle s1 s2 s3 en/set c1- c1+ r6 330 r7 330 c4 0.1f 1 23 j1 dc+ dc- vdd 1 gp5 2 gp4 3 gp3 vss gp0 gp1 gp2 4 5 6 7 8 u2 pic12f675 d1 d2 d3 d4 led1 green led2 red vr1 pot10k gnd 10f c8 c2+ c2- r9 0 r10 0 r11 0 r12 0 d4 1 en/set 2 c1+ c2+ c1- 3 4 out d3 d2 d1 c2- gnd vin 5 6 7 8 9 10 11 12 exp pad 0 u1 AAT3351 figure 3: AAT3351 evaluation board schematic.
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 3351.2009.02.1.0 13 www.analogictech.com evaluation board layout figure 4: AAT3351 evaluation board figure 6: AAT3351 evaluation board top side layout. bottom side layout. AAT3351 evaluation board bill of materials component part number description manufacturer u1 AAT3351 high ef ciency 1x/1.5x charge pump for white led; tdfn33-12 package analogictech u2 pic12f675 8-bit cmos, flash-based c; 8-pin mcu microchip c in , c out , c1, c2 grm188r61a105ka61 1 f, 10v, x5r, 10%, 0603 murata c4 grm219r71c104ka01 0.1 f, 10v, x7r, 10%, 0805 murata c6 grm219r61a475ke19 4.7 f, 10v, x5r, 10%, 0805 murata c8 dnp do not place d1-d4 lw m673 mini topled white led osram led1 21ugc/tr8 green led; 0805 led0 cmd15 chicago miniature lamp led2 21src/tr8 red led; 0805 led7 cmd15 chicago miniature lamp r2 chip resistor 20k, 1/16w, 1%, 0603 vishay r3-r5 chip resistor 1k, 1/16w, 1%, 0603 vishay r6-r7 chip resistor 330, 1/16w, 1%, 0603 vishay r8 chip resistor 1m, 1/16w, 1%, 0603 vishay r9-r12 chip resistor 0, 1/16w, 1%, 0603 vishay s1, s2, s3 pts645tl50 switch tact, spst, 5mm itt industries vr1 evn-5esx50b14 10k pot; 3mm squared smd panasonic-ecg
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 14 3351.2009.02.1.0 www.analogictech.com ordering information package marking 1 part number(tape & reel) 2 tsopjw-12 AAT3351itp-t1 tdfn33-12 5yxyy AAT3351iwp-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 3 tsopjw-12 0.20 + 0.10 - 0.05 0.055 0.045 0.45 0.1 5 7 nom 4 4 3.00 0.10 2.40 0.10 2.85 0.20 0.50 bsc 0.50 bsc 0.50 bsc 0.50 bsc 0.50 bsc 0.15 0.05 0.9625 0.0375 1.00 + 0.10 - 0.065 0.04 ref 0.010 2.75 0.25 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 the 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.
AAT3351 high efficiency 1x/1.5x charge pump chargepump tm product datasheet 3351.2009.02.1.0 15 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 product. 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 relating 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. tdfn33-12 top view bottom view detail "a" side view 3.00 0.05 index area detail "a" 1.70 0.05 3.00 0.05 0.05 0.05 0.23 0.05 0.75 0.05 2.40 0.05 pin 1 indicator (optional) 0.43 0.05 0.45 0.05 0.23 0.05 0.1 ref c0.3 all dimensions in millimeters.

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