1-Cell Li+ Switch Mode Battery Charger

Manufacturer's part number :


Manufacturer Skyworks


Description :

The BatteryManager™ AAT3620 is an ideal solution for charging high capacity Li+ batteries. The AAT3620 can supply up to 2.0A charge current with minimal thermal impact to mobile systems with features such as colour display, camera with flash, organizer, video, etc, that require battery capacity to keep pace with the power requirements. 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 overcurrent, over-voltage, short-circuit or over-temperature failure, the device will automatically shut down. Two status monitor output pins are provided to indicate the battery charge status and power source status though two display LEDs. The AAT3620 has a no-battery detection feature, 'No-BAT', which requires the safety timer. The AAT3620-2 option is for applications where the safety timer may be disabled independently and the 'No-BAT' feature is not required. The AAT3620 is available in a thermally enhanced, spacesaving 14-pin 3mm x 3mm TDFN package.

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    • 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
    • 'No-BAT' Detect AAT3620 Only
    • Safety Timer
    • 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

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Battery Technology Li+  

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Linear Mode Yes  
Number of Cells 1  
Int/Ext FET Int  
Vcc Range (V) 4.3 to 6  
Voltage Regulation Accuracy (%) 1  
Temperature Monitor Yes  
Charge Safety Timers Yes  
Max Thermal Regulation Yes  
Operating Temperature (°C) -25 to +85  
Package TDFN33-14  
Cell Voltage (V) 4.2  
Max. Charging Current (mA) 2000