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EVAL6924D: Single Li-Ion Battery Charger

Summary

The L6924D is a fully monolithic battery charger dedicated to single-cell Li-Ion/Polymer battery packs. It is the ideal solution for space-limited applications, like PDAs, handheld equipment, cellular phones, and digital cameras. It is designed with BCD6 technology and integrates all of the power elements (the Power MOSFET, reverse blocking diode and the sense resistor) in a small VFQFPN16 3mm x 3mm package.

When an external voltage regulated wall adapter is used, the L6924D works in Linear Mode, and charges the battery in a Constant Current/Constant Voltage (CC/CV) profile. Moreover, when a current-limited adapter is used, the device can operate in Quasi-Pulse Mode, dramatically reducing the power dissipation. Regardless of the charging approach, a closed loop thermal control avoids device overheating.

The device has an operating input voltage ranging from 2.5V to 12V and it allows the user to program many parameters, such as pre-charge current, fast-charge current, pre-charge voltage threshold, end-of-charge current threshold, and charge timer. Features a programmable charge current up to 1A.

Specifications

Manufacturer STMicroelectronics
Category Power Management
Sub-Category Battery Chargers
Eval Board Part Number 497-5504-ND
Eval Board Supplier STMicroelectronics
Eval Board -
Cell Type Lithium Ion, Li-Ion
Configuration 1 Cell
Voltage In 2.5 ~ 12 V
Voltage Out 4.1 V
4.2 V
Current Out 500 mA
1 A
Features Cell Preconditioning
Cell Temperature Monitoring
Current Limit (Adj. or Fixed)
Fault Indication
Low Battery Warning
Over Charge Protection
Over Current Protection
Power Save Mode
Reverse Polarity Protection
Shutdown, Enable, Standby
Status Indication
Thermal Protection
Quiescent Current [Typical] 1.8 mA
Sleep Mode Current [Typical]
Component Count + Extras 17 + 5
Application / Target Market Cellular Phone
Digital Cameras
MP3 Players
Portable Devices
USB Powered Devices
Design Author STMicroelectronics
Main I.C. Base Part L6924D
Quiescent Current [Maximum] 2.5 mA
Sleep Mode Current [Maximum] 80 µA

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