LTC4097 DEMO CIRCUIT Datasheet

LTC4097 DEMO CIRCUIT USB/Wall Adapter Standalone Li-Ion/Polymer Battery Charger

Demonstration circuit 1101 is a USB/Wall Adapter Standalone Li-Ion/Polymer Battery Charger featuring the LTC4097.

The LTC4097 is capable of charging a single cell Li-Ion or Li-Polymer battery from a wall adapter input or a USB input. The LTC4097 will detect and automatically select the appropriate input and charging current when an adequate input is available. The Voltage for NTC (VNTC) pin indicates when sufficient input power is available from either input and can drive up to 120mA to bias the NTC circuit and a charge LED.

When the adapter input (DCIN) is available, the charge current is programmed to provide 1A of constant charge current by the 1KΩ resistor, R2. The charge current is programmed to provide 475mA of constant charge by the 2.1KΩ resistor, R1, when the USB input (USBIN) is providing the input power and the High Power (HPWR) jumper is set to the 100% position. The HPWR jumper allows the user to select a constant charge current of 475mA in the 100% position, or 95mA in the 20% position when the USBIN input is providing the power. The charge cycle is programmed to terminate when the charge current drops below 50mA in constant voltage mode. This is set by the 2KΩ resistor, R3.

The LTC4097 also features a trickle charge mode, automatic recharge, under-voltage lockout and more. Please refer to the LTC4097 data sheet for more information.

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