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| innovative power tm - 1 - www.active-semi.com copyright ? 2014 active-semi, inc. activeswitcher tm is a trademark of active-semi. features ?? dedicated single chip solution for mobile power with minimal component count ?? 5v/2.5a constant output current limit in boost mode ?? 2.5a switching charger current limit ?? programmable 4.1v to 4.35v battery voltage ?? 95% boost efficiency vbat=4.1v) ?? adaptive to 10ma-2400ma input sources ?? battery disconnection at output short ?? <10a low battery leakage current at hz mode during storage ?? boost auto turn-off at no load and push button turn-on ?? battery over current, over voltage, over temperature and short circuit protections ?? boost auto startup with load detection ?? up to 3.0a input current limit with prioritized power path to output ?? 5v+/-100mv output voltage in boost mode ?? 1.1mhz/0.55mhz switching frequencies ?? 2.2uh inductor and low profile ceramic capacitors ?? 4 leds battery level and status indication ?? battery impedance compensation ?? full cycle of battery charge management preconditioning, fast charge, top off and end of charge ?? charge current foldback at 110c die temperature ?? ic over temperature protection at 160c ?? qfn4x4-24 package applications ?? backup battery pack ?? power bank ?? mobile power ?? standalone battery charger with usb output general description ACT2802 is a space-saving and high-performance low-profile single-chip solution for backup battery pack and standalone battery charger. ACT2802 integrates all the functions that a backup battery pack needs, including switching charger, boost converter and led indication. ACT2802 operates at 1.1mhz for switching charger and 0.55mhz for boost converter allowing tiny external inductor and capac itors. ACT2802 provides a direct power path from input to output with programmable current limit while providing power to switching charger. output has higher priority than battery charger if the programmed input current limit is reached. ACT2802 charges battery with full cycle of preconditioning, fast charge with constant current and constant voltage until end of charge. the battery charger is thermally regulated at 110c with charge current foldback. ACT2802 boost converter steps battery voltage up to 5v. boost converter features high efficiency, constant current regulation, short circuit protection and over voltage protection. ACT2802 provides 3.5ma constant currents to drive 4 leds to indicate battery level and charge status. 5v/2.5a backup battery pack manager rev 0, 21-jan-14 ACT2802 boost output voltage (v) output current (a) 0 0.3 0.6 0.9 2.1 2.4 2.7 1.2 1.5 1.8 5.5 5.0 4.5 4.0 3.5 3.0 boost cc/cv profile v bat =3.7v v bat =3.2v v bat =4.1v
ACT2802 rev 0, 21-jan-14 innovative power tm - 2 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. ordering information part number boost switch frequency output charge current package packing ACT2802ql-t 0.55mhz 5v/2.5a 2.5a qfn44-24 tape & reel, 3ku/reel pin configuration agnd pb hz vin csp csn led1 ilim icst iost 1 2 3 4 5 6 78 9101112 13 14 15 16 17 19 20 21 22 23 24 npg btv ep top view qfn44-24 18 ACT2802 rev 0, 21-jan-14 innovative power tm - 3 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. pin descriptions pin name description 1 hz boost high-z mode enable pin, internally pulled up by a 3m ? resistor to battery. when hz pin is pulled ground, boost is enabled if vin is not present. 2 pb push button input, connect a push button from this pin to agnd, internally pulled up by a 3m ? resistor to battery. when this pin is pushed for 100ms, led1-4 indicators are enable for 5 seconds. pb starts up boost converter if hz pin is grounded and vin is not present. 3 agnd logic ground. 4 npg drive external p-fet to protect output short circuit and leakage during shutdown. npg pin is pulled up to vout internally. npg pin is pulled low if vout is in the range. 5 ilim input current limit setting pin. connect a resist or from this pin to agnd to set the input current limit. the current setting ranges from 1.0a-3.0a. 6 vin usb or ac adaptor input. when vin is valid, charge and power path is enabled. 7, 8 vout output pin. bypass to pgnd with a high quality low esr and esl ceramic capacitor placed as close to the ic as possible. 9, 10 sw internal switch to output inductor terminal. 11 pgnd power ground. pgnd is connected to the so urce of low-side n-channel mosfet and the mosfet?s gate driver. 12 bat battery input. connected to t he battery pack positive terminal to provide power in high -z mode. bypass to pgnd with a high quality ceramic capacitor placed as close to the ic as possible. 13 csp positive terminal of charge current sense input. kevin sense is required with 10nf ceramic capacitor right across csp and csn pins. 14 csn negative terminal of charge current sense input. 15 iost output current setting. connect a resistor from this pin to agnd to set output constant current. the current setting ranges from 1.0a-2.5a. 16 icst fast charge current setting pin. connect a re sistor from this pin to agnd to set the charge current. the current setting ranges from 1.0a-2.5a. 17 btv battery termination voltage setting. connec t a resistor from this pin to agnd to program battery charge termination voltage. 18 led1 battery level indica tor. an internal 3.5ma sink current limit is built in. 19 led2 battery level indica tor. an internal 3.5ma sink current limit is built in. 20 led3 battery level indica tor. an internal 3.5ma sink current limit is built in. 21 led4 battery level indica tor. an internal 3.5ma sink current limit is built in. 22 rimc battery impendence compensation input. connect to a resistor from this pin to apng to program the battery impedance. 23 blvs battery level voltage shift. connect a resistor from this pin to agnd to shift the battery led indication thresholds. 24 th temperature sensing input. connect to batte ry thermistor terminal. if no use, put 10k pulled down resistor. 25 ep exposed pad. must be soldered to ground on the pcb. ACT2802 rev 0, 21-jan-14 innovative power tm - 4 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. absolute maximum ratings ? parameter value unit all the pin to pgnd and agnd -0.3 to 6.5 v junction to ambient the rmal resistance 40 c/w maximum power dissipation 2.5 w operating junction temperature -40 to 150 c storage junction temperature -40 to 150 c lead temperature (soldering 10 sec.) 300 c operating ambient temperature -40 to 85 c ? : do not exceed these limits to prevent damage to the device. exposure to absolute maximum rati ng conditions for long periods m ay affect device reliability. ACT2802 rev 0, 21-jan-14 innovative power tm - 5 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. parameter test conditions min typ max unit input current limit input voltage range 4.5 5.5 v v in over voltage protection vin rising, v in _ovp 5.5 6.0 6.5 v input voltage validation time vi n_uvlo ACT2802 rev 0, 21-jan-14 innovative power tm - 6 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. parameter test conditions min typ max unit precondition voltage threshold vbat rising, rbtv=0 2.8 v precondition voltage threshold hysteresis 130 mv low vbat charge current vbat=1v, r icst =43.2k ? 200 ma eoc current threshold vbat=4.2v, percent of the fast charge current 13 % charge restart voltage threshold 200 mv th upper temperature voltage threshold cold detect ntc thermistor 1.45 1.5 1.55 v th lower temperature voltage threshold hot detect ntc thermistor 0.28 0.3 0.32 v th hysteresis 50 mv th internal pull-up current 60 a charge current foldback charge current reduction threshold1 of vout 1 starting foldback point 4.63 4.7 4.77 v charge current reduction threshold2 of vout1 stop foldback point, r cs =25m ? , r icst =43.2k ? 4.57 v boost mode input voltage operatio n range 3.0 4.5 v switching frequency ACT2802ql-t -15% 0.55 +15% mhz input voltage uvlo vbat rising 3.3 v input voltage uvlo hysteresis vbat falling 400 mv output voltage ta=25 4.97 5.05 5.10 v output voltage accuracy all conditions -3 vout 2 % 80ma-1a-80ma, 0.1a/us 4.75 5.25 v 1a-2.0a-1a, 0.1a/us 4.7 5.25 v output over voltage protection vout rising 5.7 v output over voltage protec tion hysteresis vout falling 300 mv output current regulation range rcs=25m ? , r iost =37.4k ? 93.7k ? 1.0 2.5 a output current limit rcs=25m ? , r iost =91k ? 2.4 a minimum on-time 100 ns low side switch peak current limit vbat=3.6v, vout=5v 4.9 6.9 a soft-startup time 400 s output voltage transient response electrical characteristics (v in = 5v, t a = 25c, unless otherwise specified.) ACT2802 rev 0, 21-jan-14 innovative power tm - 7 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. parameter test conditions min typ max unit under voltage protection (uvp thre shold) vout falling 4.25 v under voltage protection (uvp threshold) vout rising 4.6 v uvp blanking time during startup 3 ms uvp sense detection time vout falling 20 s restart after uvp hiccup mode 2 s light load current shut off threshold 40 ma light load current detect time 90 s hz pin high voltage hz voltage rising 0.9 1.4 v hz pin low voltage hz voltage falling 0.4 0.75 v hz internal pull-up resistor 3 m ? pb turn off boost time 3 s pb turn on boost time 100 ms mode transition transition waiting time between charge mode and boost mode trantime 2 s battery level indication battery impedance compensation range 40 500 m ? battery impedance compensation rcs=25m ? , r imc 200k ? 200 m ? pb deglitch time 100 ms pb high input voltage pb voltage rising 0.9 1.4 v pb low input voltage pb voltage falling 0.4 0.75 v pb internal pull-up resistor 3 m ? led indication time pb is pushed and released 5 s led flash frequency charging, led flash 1s on and 1s off 0.5 hz electrical characteristics (v in = 5v, t a = 25c, unless otherwise specified.) ACT2802 rev 0, 21-jan-14 innovative power tm - 8 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. functional description ACT2802 is a complete battery charging and discharging power management solution for applications of single-cell lithium-based backup battery pack or power bank. there is a power path from input to output with programmable input current limit. when output is over loaded, the input switch q1 starts going into linear mode and thus output voltage starts to drop. if output voltage drops below 4.25v, the input switch q1 turns off and restart in 2 seconds. with the advanced ACT2802 architecture, a synchronous buck/boost converter is connected from vout to switching node (sw). with the bidirectional architecture, the converter could be configured as either buck to charge battery or boost to discharge battery. with switching charger and discharger, the higher charge current and higher conversion efficiency are achieved. modes of operation ACT2802 has 3 operation modes: charge mode, boost mode and high-impedance (hz) mode. in charge mode, the input current limit is enabled and the q2 and q3 operate as a buck converter to charge battery. in boost mode, q2 and q3 operate as boost converter to step battery voltage up to +5v at vout, and the current limit switch q1 is turned off, and the reverse current from vout to vin is blocked. in hz mode, all the switches are turned off and the drainage current from battery is very low. the system operation flow chart as shown in figure 1. any transitions between boost mode and charge mode go through hz mode by turning off all the switches q1-q3 into hz mode for 2 seconds before enabling the other mode. the modes are determined by hz pin and vin pin as shown in the table 1. a valid vin voltage forces ACT2802 into charge mode. boost mode is enabled if hz pin is pulled low and vin is invalid or not present. when hz=0, if pb is pulled low for more than 100ms, boost converter is enabled. a running boost is disabled if one of the following conditions is met: 1. after pb is released, if pb is pulled low for more than 3 seconds. 2. boost converter output current is below light load threshold for 1.5 minutes. 3. battery voltage falls below the boost cut-off threshold. functional block diagram ACT2802 rev 0, 21-jan-14 innovative power tm - 9 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. figure 1: ACT2802 system operation flow chart functional description input current limit when the input current reaches the programmed value, switch q1 goes into linear mode and output voltage starts to drop. when output voltage drops to 4.25v, hiccup mode is triggered and switch q1 turns off and restart in 2 seconds. switching battery charger ACT2802 is configured in charge mode (buck mode) when vin is valid. in this mode, a battery is charged with preconditioning, fast charge, top-off and end of charge (eoc). the typical charge management is shown in figure 2 and figure 3. cc/cv regulation loop there are cc/cv regulation loops built in ACT2802, which regulates either current or voltage as necessary to ensure fast and safe charging of the battery. in a normal charge cycle, this loop regulates the current to the value set by the external resistor at the icst pin. charging continues at this current until the battery cell voltage reaches the termination voltage. at this point the cv loop takes over, and charge current is allowed to decrease as necessary to maintain charging at the termination voltage. precondition charge a new charging cycle begins with the precondition state, and operation continues in this state until v bat exceeds the precondition threshold voltage. when operating in precondition stat e, the cell is charged at a reduced current, 10% of the programmed maximum fast charge constant current. once v bat reaches the precondition threshold voltage the state machine jumps to the fast charge state. fast charge if battery voltage is above preconditioning threshold, buck converter charges battery with constant current. in fast charge state, the ACT2802 charges at the current set by the external resistor connected at the icst pin . during a normal charge cycle fast charge continues in cc mode until v bat reaches the charge termination voltage, at which point the ACT2802 charges in top off state. top off with the battery voltage approaches the eoc voltage set by the btv pin. charge current decreases as charging continues. in the top off state, the cell is charged in constant voltage (cv) mode. during a normal charging cycle charging proceeds until the charge current decreases below hz pin 0 0 1 1 vin valid 0 1 0 1 mode boost charge hz charge table 1: mode selection ACT2802 rev 0, 21-jan-14 innovative power tm - 10 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. functional description the end of charge (eoc) threshold, defined as 13% of fast charge current. when this happens, the state machine terminates the charge cycle and jumps to the eoc state. ? end of charge when charges current decreases to 13% of set fast charge current, the buck converter goes into end of charge mode and keep monitoring the battery voltage. recharge when battery voltage drops by 200mv below the end of charge voltage, the charger is reinitiated with constant current charge. a: precondition state b: fast-charge state c: top-off state d: end-of-charge state figure 2. typical li+ charge profile and ACT2802 charge states figure 3. charger state diagram ACT2802 rev 0, 21-jan-14 innovative power tm - 11 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. applications information battery charge termination voltage battery charge termination voltage is set by a resistor rbtv connected from btv pin to agnd as shown in figure 4. the battery charge termination voltage is estimated as the following equation: r btv is selected based on the battery voltage rating. 1% accuracy resistor is recommended for r btv . led status indication 4 leds on/off and flash show the charge status and the remained capacity level as shown in the table 2. the led status is based on battery voltage and operation modes. in charge mode, when a battery is fully charged, flashing stops and all the 4 leds are solid on. battery level voltage shift (blvs pin) led1-4 voltage thresholds are adjusted from hz mode during charging and discharging based on the compensated impedance. those thresholds are programmed by a resistor connected from blvs pin to agnd as shown in figure 5. the following equation shows the led4 voltage threshold: as long as led4 is set, all the other 3 led thresholds is fixed as shown in the table 3: table 3: 4 led voltage thresholds input current limit an external resistor is used to set the input current limit connected from ilim pin to agnd as shown in figure 6. input current limit has built-in soft startup and current foldback control loop. the input current limit is estimated as the following equation: r blvs (ohm) 50k 60k 70k 80k led1 3.35v 3.45v 3.55v 3.65v led2 3.60v 3.70v 3.80v 3.90v led3 3.75v 3.85v 3.95v 4.05v led4 4.00v 4.10v 4.20v 4.30v charge mode pb time>100ms (boost or hz mode) led1 led2 led3 led4 led1 led2 led3 led4 vbat ACT2802 rev 0, 21-jan-14 innovative power tm - 13 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. table 4: battery impedance boost output plug-in auto detection figure 13 provides a solution for auto plug-in detection. input over voltage surge in the case of pure ceramic input capacitor is chosen, if the input cable is long, stray inductance may cause over voltage spikes as twice as the steady-state voltage when input source is plugged in. below input circuit is recommended to avoid input voltage surge. r1 resistor is added in series with capacitor c1 to damp the potential lc resonance as shown in figure 14. external input over voltage protection considering the maximum voltage rating at vin pin, the external ovp circuit as shown in figure 15 is recommended if input voltage may go higher than 7v. with the enhanced ovp circuit, input voltage can be up to 18v. flashlight circuit figure 16 shows a circuit with flashlight driver and control. leds on in boost mode leds can be always on during boost mode, the schematic is shown in figure17. inductor and capacitor selection ACT2802 supports smd components. 2.2uh inductor is recommended. input side, 4.7uf ceramic capacitor in series with 2.7 ? resistor are recommended, on battery side, 22uf ceramic capacitors is recommended while on output side, 22ufx2 ceramic capacitors are recommended. battery temperature monitoring the ACT2802 continuously monitors the temperature of the batte ry pack by sensing the resistance of its thermistor, and suspends charging if the temperature of t he battery pack exceeds the safety limits. in a typical application, the th pin is connected to the battery pack's thermistor input as shown in figure 18. the ACT2802 injects a 60a current out of the th pin into the thermistor, so that the thermistor resistance is monitored by comparing the voltage at th to the internal v thl and v thh thresholds of 0.3v and 1.5v, respectively. when v th > v thh or v th < v thl charging and the charge timers are suspended. when v th returns to the normal range, charging and the charge timers resume. the net resistance from th to gnd required to cross r imc (k ? ) 50 100 200 battery impedance r(m ? ) rcs=25m ? 50 100 200 rcs=50m ? 100 200 400 figure 13. boost output auto detection circuit figure 14. input over voltage surge protection circuit figure 15. input over voltage protection figure 16. flashlight circuit figure 17. leds on in boost mode circuit ACT2802 rev 0, 21-jan-14 innovative power tm - 14 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. the threshold is given by: 60ar nom k hot =0.3v r nom k hot =5k ? 60ar nom k cold =1.5v r nom k cold = 25k ? where r nom is the nominal thermistor resistance at room temperature, and k hot and k cold are the ratios of the thermistor's resistan ce at the desired hot and cold thresholds, respectively. figure 18. battery thermal circuit ACT2802 rev 0, 21-jan-14 innovative power tm - 15 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. when laying out the printed circuit board, the following checklist should be used to ensure proper operation of the ic. 1. arrange the power components to reduce the ac loop size, vin pin, vout pin, sw pin and the schottky diode. 2. place input decoupling ceramic capacitor c3 and r10 as close to vin pin as possible. resistor r10 is added in series with capacitor c3 to damp the potential lc resonance . 3. use copper plane for power gnd for best heat dissipation and noise immunity. 4. place csp and csn capacitor c6 (10nf) close to csp and csn pin as possible, use kevin sense from sense resistor r2 and r2a to csp and csn pins. 22uf decoupling capacitor is added close to bat pin. 5. place the ceramic capacitor c2 and d1 as close to vout and pgnd as possible, sw goes under the c2 (recommend c2 to use 1206 size). sw pad is a noisy node switching. it should be isolated away from the rest of circuit for good emi and low noise operation. 6. thermal pad is conne cted to gnd layer through vias (recommend 4x4 pins and the aperture is 10mil). ground plane, pgnd and agnd is single point connec ted under the ACT2802 thermal pad through vias to limited sw area. 7. from bat pin to the battery positive terminal, need to lay the divided line to ensure the battery voltage accuracy of sampling. 8. rc snubber is recommended to add across sw to pgnd to reduce emi noise. 1a /20v schottky is added to across v out and sw pins. a demo board pcb layout exam ple is shown in the figure 19. top layer figure 19. pcb layout bottom layer pc board layout guidance ACT2802 rev 0, 21-jan-14 innovative power tm - 16 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. figure 20 typical application circuit (input current limit 3.0a, fast charge current li mit 2.1a, boost output constant current limit 2.4a) th rimc blvs led4 led3 led2 bat pgnd sw sw vout vout led1 led2 led3 led4 r6 r8 r7 ACT2802 rev 0, 21-jan-14 innovative power tm - 17 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. bom list item reference description qty manufacturer 1 l1 core 6.5*3*3 dip 2.2uh 6a 1 sunlord 2 q1 ao4503, rdson=19m ? at vgs = - 4.5 v 1 vishay 3 q3 mmbt3906 1 vishay 4 d1 ss12, vf=0.5v, 20v schottky 1 panjit 5 d2 1n4148, vf=0.7v, 75v schottky 1 vishay 6 c2,c5,c9 ceramic capacitor, 22uf/10v, x7r, 1206 3 murata/tdk 7 c3 ceramic capacitor, 4.7uf/10v, x7r, 1206 1 murata/tdk 8 c4 ceramic capacitor, 0.1uf/10v, x7r, 0603 1 murata/tdk 9 c6 ceramic capacitor, 10nf/10v, x7r, 0603 1 murata/tdk 10 c7 ceramic capacitor, 2.2nf/10v, x7r, 0603 1 murata/tdk 11 c8,c11,c12,c13 ceramic capacitor, 2.2uf/10v, x7r, 0603 4 murata/tdk 12 r1 chip resistor, 806 ? , 1/10w, 1%, 0603 1 murata/tdk 13 r2,r2a chip resistor, 50m ? , 1/4w, 1%, 1206 2 murata/tdk 14 r3 chip resistor, 93.1k ? , 1/10w, 1%, 0603 1 murata/tdk 15 r4,r17 chip resistor, 43.2k ? , 1/10w, 1%, 0603 2 murata/tdk 16 r5 chip resistor, 25k ? , 1/10w, 1%, 0603 1 murata/tdk 17 r6 chip resistor, 10k ? , 1/10w, 5%, 0603 1 murata/tdk 18 r7 chip resistor, 60k ? , 1/10w, 1%, 0603 1 murata/tdk 19 r8 chip resistor, 100k ? , 1/10w, 1%, 0603 1 murata/tdk 20 r9 chip resistor, 1 ? , 1/8w, 5%, 0805 1 murata/tdk 21 r10 chip resistor, 2.7 ? , 1/4w, 5%, 1206 1 murata/tdk 22 r11 chip resistor, 200k ? , 1/10w, 5%, 0603 1 murata/tdk 23 r12,r13 chip resistor, 715k ? , 1/10w, 5%, 0603 2 murata/tdk 24 r14,r16 chip resistor, 49.9k ? , 1/10w, 5%, 0603 2 murata/tdk 25 r15 chip resistor, 75k ? , 1/10w, 1%, 0603 1 murata/tdk 26 r18,r19 chip resistor, 100k ? , 1/10w, 5%, 0603 2 murata/tdk 27 r20 chip resistor, 2.2 ? , 1/10w, 5%, 0603 1 murata/tdk 28 led1,led2, led3,led4 led, 0603, blue 4 led manu 29 pb push button switch 1 nikkai omron 30 usb 10.2*14.6*7mm, 4p 1 31 micro-usb micro usb 5p/f smtb 1 32 u1 ic, ACT2802, t-qfn 44-24 1 act ACT2802 rev 0, 21-jan-14 innovative power tm - 18 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. typical performance ch aracteristics cont?d (schematic as show in figure 20, ta = 25c, unless otherwise specified) ACT2802-01 input current (ma) 3000 2000 1500 1000 500 0 2500 output current (ma) 0 500 1000 1500 2000 2500 ACT2802-02 charge current (ma) 2500 2000 1500 1000 500 0 vbat (v) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 ACT2802-03 charge efficiency efficiency(%) 92.0 91.5 91.0 90.5 90.0 89.5 89.0 vbat (v) 3.0 3.2 3.4 3.6 3.8 4.0 4.2 ACT2802-05 battery charge current vs. temperature battery charge current (ma) 3000 2000 1500 1000 500 0 2500 temperature (c) -20 0 20 40 60 80 100 120 140 ACT2802-04 boost efficiency efficiency(%) 100.0 90.0 80.0 70.0 60.0 50.0 40.0 output current (ma) 0 300 600 900 1200 1500 1800 2100 2400 input current charge current vbat=3.2v vbat=3.7v vbat=4.1v ACT2802-06 i bat (ma) 25.0 20.0 15.0 10.0 5.0 0 temperature (c) -20 0 20 40 60 80 120 100 boost leakage vs. temperature (hz mode) vbat=4.1v vbat=3.5v v in = 5.0v v bat = 3.5v v in = 5.0v i chrg = 2.1a v in = 5.0v i chrg = 2.1a v in = 5.0v v bat = 3.5v battery charge v/i profile charge current vs. output current ACT2802 rev 0, 21-jan-14 innovative power tm - 19 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. typical performance ch aracteristics cont?d v bat = 3.5v cv= 4.5v rcs=25m ? (1%) v bat = 3.5v v out = 5.05v (schematic as show in figure 20, ta = 25c, unless otherwise specified) ACT2802-07 ACT2802-08 boost output voltage vs. temperature boost output voltage (v) 5.4 5.3 5.2 5.1 5.0 4.9 4.8 temperature (c) -30 0 30 60 90 120 150 boost output constant current limit vs. temperature boost output constant current (ma) 2800 2600 2400 2200 2000 1800 3000 temperature (c) -20 0 20 40 60 120 140 80 100 boost output voltage vs. output current ACT2802-09 boost output voltage (v) 5.05 5.01 4.97 4.93 4.89 4.85 boost output current (ma) 0 500 1000 1500 2000 2500 3000 vbat=4.15v vbat=3.2v ACT2802-011 boost standby current vs. battery voltage standby current (ma) 057 0.55 0.53 0.51 0.49 0.47 0.45 battery voltage(v) 3.0 3.3 3.6 3.9 4.2 45 4.8 ACT2802-012 battery leakage (a) 8.0 5.0 4.0 3.0 2.0 1.0 0 7.0 6.0 battery voltage(v) 0 1.0 2.0 3.0 4.0 5.0 boost leakage vs. battery voltage (hz mode) act2801-010 boost output constant current limit vs. vbat boost output constant current ma) 2550 2450 2400 2350 2300 2250 2500 vbat (v) 3.0 3.2 3.4 3.6 3.8 4.0 4.2 ACT2802 rev 0, 21-jan-14 innovative power tm - 20 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. typical performance ch aracteristics cont?d ch1 ch2 ACT2802-017 v in = 5.0v v bat = 4.1v (schematic as show in figure 20, ta = 25c, unless otherwise specified) ch3 ch1: v in , 5v/div ch2: v npg , 5v/div ch3: vout, 2v/div time: 1s/div boost load transient (80ma-1a-80ma) ch1 ch2 v bat = 3.4v v out = 5.0v i iost = 2.4a boost load transient (1a-2.1a-1a) ACT2802-014 ch1 ch2 v bat = 4.2v v out = 5.0v i iost = 1.3a ACT2802-013 ch1: v out , 100mv/div ch2: i out , 1a/div time: 1ms/div ch1: v out , 100mv/div ch2: i out , 1a/div time: 1ms/div v bat = 3.4v v out = 5.0v i iost = 2.4a ACT2802-016 v bat = 4.1v v out = 5.0v i out = 2.4a ch1 ch2 ACT2802-015 v bat = 3.4v v out = 5.0v i out = 1.0a ch1 ch2 ch1: v out , 20mv/div ch2: v sw , 2v/div time: 1us/div v bat = 3.4v v out = 5.0v i out = 2.4a transition between buck mode and boost mode sw and output waveforms in boost mode sw and output waveforms in boost mode ch1: v out , 20mv/div ch2: v sw , 2v/div time: 1us/div v in = 5.0v v bat = 4.1v v in v npg v out ACT2802 rev 0, 21-jan-14 innovative power tm - 21 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi confidential D do not copy or distribute activeswitcher tm is a trademark of active-semi. package outline qfn44-24 package outline and dimensions active-semi, inc. reserves the right to modify the circuitry or specifications without notice. user s should evaluate each product to make sure that it is suitable for their applicat ions. active-semi products are not intended or authorized for use as critical components in life-support dev ices or systems. active-semi, inc. does not assume any liability arising out of the use of any product or circuit described in this datasheet, nor does it convey any patent license. active-semi and its logo are trademarks of active-semi, inc. for more information on this and other products, contact sales@active-semi.com or visit http://www.active-semi.com . is a registered trademark of active-semi. symbol dimension in millimeters dimension in inches min max min max a 0.700 0.800 0.028 0.031 a1 0.000 0.050 0.000 0.002 a3 0.200 ref 0.008 ref b 0.180 0.300 0.007 0.012 d 3.850 0.152 e 3.850 0.152 d2 2.500 2.800 0.098 0.110 e2 2.500 2.800 0.098 0.110 e 0.500 bsc 0.020 bsc l 0.350 0.450 0.014 0.018 r 0.200 typ 0.008 typ 4.150 4.150 0.163 0.163 k 0.200 0.008 --- --- |
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