MM1639

MITSUMI Lithium-Ion Battery Charge Control (with timers) MM1639 Lithium-Ion Battery Charge Control (with timers) Monolithic IC MM1639 Outline This is a lithium-ion battery charge control IC. It incorporates constant-voltage and constant-current circuits for easy implementation of lithium-ion battery charge. It includes functions to disable charging to overdischarged batteries, disable charging due to abnormal temperature, etc., and timer functions. It is also equipped with a 2-channel LED driver to allow the charge status to be displayed. Features 1. Operating supply voltage 2.7~5.9V 2. Operating ambient temperature -20~70ºC 3. Current consumption 5.0mA typ. 4. Low voltage detection voltage 2.0V typ. 5. BAT pin output voltage 4.20±0.03V (Ta=0~50ºC) 6. Recharge detection voltage 3.90V typ. 7. Precharge detection voltage 2.90V typ. 8. Fast-charge current setting Rsense=0.22V/IqCHG Example: For 0.70A, 0.22V/0.70A=0.31Ω (Rsence) Precharge current 0.026V/Rsence=0.02...