innovative power tm - 1 - www.active-semi.com copyright ? 2013 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, 06-nov-13 product brief 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 free datasheet http://
ACT2802 innovative power tm - 2 - www.active-semi.com copyright ? 2013 active-semi, inc. activeswitcher tm is a trademark of active-semi. rev 0, 06-nov-13 product brief 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 free datasheet http://
ACT2802 innovative power tm - 3 - www.active-semi.com copyright ? 2013 active-semi, inc. activeswitcher tm is a trademark of active-semi. rev 0, 06-nov-13 product brief 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. free datasheet http://
ACT2802 innovative power tm - 4 - www.active-semi.com copyright ? 2013 active-semi, inc. activeswitcher tm is a trademark of active-semi. rev 0, 06-nov-13 product brief 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. free datasheet http://
ACT2802 innovative power tm - 5 - www.active-semi.com copyright ? 2013 active-semi, inc. activeswitcher tm is a trademark of active-semi. rev 0, 06-nov-13 product brief 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 --- --- free datasheet http://
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