general description the max14676/max14676a are battery-charge- management solutions ideal for low-power wearable applications. these devices include a linear battery- charger with a smart power selector?, modelgauge? fuel gauge, and several power-optimized peripherals. they feature an ultra-low-power buck regulator with a quiescent current of 900na (typical) and 74% efficiency with 10a output. the battery charger features smart power selector operation, allowing operation with dead battery. it limits input current based on a register setting. if the charger power source is unable to supply the entire system load, the smart power control circuit will supplement the system load with current from the battery. the max14676/max14676a embed a maxim proprietary modelgauge fuel gauge to provide an accurate estimate of the available capacity for rechargeable lithium batteries. the max14676/max14676a include a synchronous high- efficiency step-down converter. the device features a fixed- frequency pwm mode for tighter regulation, and a burst mode for increased efficiency during light-load operation. the max14676/max14676a have a boost regulator and three programmable current sinks that can be used to drive a variety of led configurations. the boost converter is controlled independently from the current sinks, and they can be also used separately. the max14676/max14676a feature a power switch con - troller that allows the device to be turned on and off by a pushbutton. this controller also provides a delayed reset signal and voltage sequencing. these devices are available in a 42-bump, 0.5mm pitch, 3.497mm x 3.118mm wafer-level package (wlp). features and beneits extend system use time between battery charging ? 1.8v low-i q 200ma buck regulator - 0.9a (typ) quiescent current - automatic burst or forced-pwm modes ? modelgauge with accurate state-of-charge easy-to-implement li+ battery charging ? smart power selector ? 28v tolerant input ? thermistor monitor minimize power-management footprint though high integration ? 3.2v low-i q 100ma ldo ? 2.0v always-on 50a ldo ? +5v safe output ldo ? 6.6v low-i q 120a charge pump support a wide variety of display options ? 5v to 17v output boost converter ? 3-channel adjustable high-voltage current sinks optimize system control ? pushbutton to enable ultra-low-power mode and power-on voltage sequencing ? i 2 c control applications wearable electronics gps watches fitness monitors portable medical devices ordering information/selector guide appears at end of data sheet. smart power selector and modelgauge are trademarks of maxim integrated products, inc. max14676/max14676a wearable charge management solution 19-6856; rev 1; 9/14 evaluation kit available downloaded from: http:///
typical application circuit li+ battery charger with smart power selector bat thm cap sys chgin nvp fuel gauge ctg qstrt cell aoldo current sinks led0 led1 scl sda mpc0 control power switch led2 gnd gnd max14676/max14676a v sys +12v vio +2.0v vio vio 1 note 1: optional for reverse voltage protection boost hvout hvlx v sys +12v hvcap gnd mpc1 3.2vldo lout +3.2v 1.8v buck blx bout +1.8v 6.6v charge pump cpout cpp cpn +6.6v 5v ldo sfout +5v v sys buzzer 0.1f 0.1f 1f 1f 1f 10f10f 15f 0.1f 1f 4.7f 4.7f 1f 2.2h3.3h scl sda int mpc0mpc1 rst key alrt alrt rst kout kin int max14676/max14676a wearable charge management solution www.maximintegrated.com maxim integrated 2 downloaded from: http:///
+ denotes lead(pb)-free/rohs compliant package. t = tape and reel. part buck 3.2v ldo stay on bit default* bump-package max14676 ewo+t forced on forced on 0 42 wlp max14676a ewo+t forced on off (default) 1 42 wlp package type package code outline no. land pattern no. 42 wlp w423f3+1 21-0209 refer to application note 1891 max14676/max14676a wearable charge management solution www.maximintegrated.com maxim integrated 49 package information f or t he la t es t package ou t line in f orma t ion and land pa tt ern s (f oo t prin ts ), go to ww w. max im in te g rate d. com /p acka ges . no te t ha t a +, # , or - in t he package c ode indica t es roh s st atus onl y. p ac k age drawing s may s how a di ff eren t suff ix c hara ct er, bu t t he drawing per t ains to t he pac k age regardle ss of roh s stat us . chip information process: bicmos ordering information/selector guide downloaded from: http:///
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