STMicroelectronics USB compatible battery charger demo board with integrated power switch for Li-Ion/Li-Polymer based on the L6924U STMicro STEVAL-ISA076V2 Data Sheet

   

   

   

For further information contact your local STMicroelectronics sales office.

February 2011

Doc ID 18138 Rev 1

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USB compatible battery charger demo board with integrated

power switch for Li-Ion/Li-Polymer based on the L6924U

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Operating input voltage up to 12 V

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Fully integrated solution with power MOSFET, 
reverse blocking diode, sense resistor, and 
thermal control 

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AC adapter or USB mode selection 

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Programmable charge current for both AC 
adapter and USB power sources separately 

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Low power/high power selection in USB mode 

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Both linear and quasi-pulse operation 

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4.2 V preset charge voltage (±1 % accuracy) 

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Programmable termination current 

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Programmable charge timer 

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Status outputs to drive LEDs or host processor 
interface 

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Battery absence detection 

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Closed loop thermal control 

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NTC or PTC thermistor interface for battery 
temperature monitoring and protection 

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RoHS compliant

The STEVAL-ISA076V2 demonstration board is 
based on the L6924U which is a fully monolithic 
battery charger dedicated to single-cell Li-
Ion/Polymer battery packs. It is the ideal solution 
for space-limited applications, such as PDAs, 
handheld equipment, cellular phones, and digital 
cameras.

When an external voltage regulated adapter or 
USB port is used, the L6924U 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.