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With Built-in AC Adaptor Secondary Side Controlling Function
Lithium Ion Battery Charging Control IC
MM1707
Announced on February 14, 2006
MM1707
§ Overview
In recent years, the market of portable devices such as cellular phones, digital cameras, portable digital audio player, etc. is rapidly expanding. To address devices' higher functions, smaller sizes, and lighter weight, their batteries are changing from size AA alkaline and nickel metal-hydride to lithium ion/lithium polymer batteries.
Although recharging function had conventionally been implemented within devices' main bodies, because the needs for downsizing, cost reduction, and recharging for backup batteries are growing, recharging function is changing to adapt AC charger which can recharge battery packs off the device.
MITSUMI has developed the lithium-ion/lithium-polymer battery recharging control IC for AC charger which can reduce recharging power loss by controlling the primary side through photo coupler and optimizing recharging current and voltage.

§ Features
1.
Integrated AC adapter secondary side controlling and lithium-ion battery recharging controlling function into 1 chip.
2.
With built-in recharging timer and protection functions for over-voltage, over-current, over-discharge, and temperature detection.
3.
Recharging status display output to LED and micro-processor (2 systems) included.

§ Main specifications
Recommended power voltage
2.7~5.9V
Current limit 1
154mV typ.±6mV
Current limit 2
27mV typ.±5.4mV
Constant voltage recharging transition voltage
4.2V typ.±0.03V
Precharge detection voltage
2.9±0.1V
Precharge timer
1199s (C=0.1µF, R=130kΩ)
Rapid charge timer
19189s (C=0.1µF, R=130kΩ)