Switching Chargers
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Switching Chargers, AAT
3620 | 1-Cell Li+ Switch Mode Battery Charger
Switching Chargers
The AAT3620 BatteryManager is a member of AnalogicTechs Total Power Management IC family. With the many functions added to mobile devices such as color display, camera with flash, organizer, video, etc, the battery capacity must keep pace with the power requirements. The AAT3620 is the ideal solution for high capacity Li+ batteries and can supply up to 2.0A charge current with minimal thermal impact to the system.
The AAT3620 is a PWM switch mode / linear charger with high charge efficiency at the full constant current (fast charge) rate. Based on a 1.5MHz PWM step-down buck converter, the AAT3620 PWM switch mode controls the constant current charge mode up to 2.0A, and automatically switches to linear mode charging during the battery conditioning low level current and the light load end of charge current termination region. The full charge rate and the end of charge current can be programmed with separate external resistors. A shared charge current indication pin is available for a Coulomb counter.
Battery charge temperature and charge state are fully monitored for fault conditions. In the event of an over-current, over-voltage, short-circuit or over-temperature failure, the device will automatically shut down. A status monitor output pin is provided to indicate the battery charge status and power source status though a display LED.
The AAT3620 is available in a thermally enhanced, space-saving 14-pin 3x3mm TDFN package that includes all essential components for a switch-mode battery charger.
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# of CellsMax Protected VIN (V)Max Charging VIN (V)Max Charge Current (mA)Input ChannelsDynamic Power ManagementAutomatic Charge ReductionActive Digital Thermal Loop ControlCharge Rate ControlSwitching Frequency (max) (kHz)
1N/A62000USB or AC AdaptorNoNoNoExternal Resistor1500
Features
4.3V~6.0V Input Range
Up to 2.0A Charge Current Capability
1.5MHz PWM/Linear Charger
Over 90% Full Rate Charge Efficiency
Integrated Switching Device
Integrated Sense Resistor
Built-in Reverse Blocking Feature
Battery Preconditioning/Constant Voltage/Constant Current Charge Mode
Programmable End of Charge Current
1% Constant Voltage Mode Regulation
Built-in Programmable Charging Timer
Charge Current Indication Pin
Over-Voltage, Over-Current, and Over-Temperature Protection
Battery Over-Temperature Protection
Power-On Reset and Soft-Start
TDFN33-14 Package
Use:Camera
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