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MCP7381X

Low-Cost Li-Ion Battery Charger Evaluation Board User’s Guide

Microchip Technology 

MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide

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Programming Resistor (kΩ)

FIGURE 2-1:

Charge Current (IOUT) vs. Programming Resistor (RPROG).

2.3 GETTING STARTED

The MCP7381X Low-Cost Li-Ion Battery Charger Evaluation Board is fully assembled

and tested for charging single-cell Li-Ion / Li-Polymer batteries with a regulated 5V DC

source or USB port.

2.3.1 Power Input and Output Connection

2.3.1.1 POWERING THE MCP7381X LOW-COST LI-ION BATTERY CHARGER

EVALUATION BOARD

1. Connect the negative battery terminal to VBAT- pin on the evaluation board and

positive battery terminal to VBAT+ pin on the evaluation board.

2. Connect 5V DC power supply negative terminal to GND pin on the evaluation

board.

3. Connect 5V DC power supply positive terminal to VDD pin on the evaluation

board. Slowly increase the supply voltage to 5V.

Note: Make sure the current limit of the DC power supply is not set below the

charge current.

4. The battery charge cycle initiates when minimum supply voltage is present. The

charge current can be measured by placing a current meter in series between

VBAT+ pin on the evaluation board and positive battery terminal.

5. Position the DIP Switch to USB_Hi for a maximum charge rate up to 500 mA and

USB_Low for maximum charge rate up to 100 mA.

Note: Remove protection film before using the DIP Switch. This may be done by

the manufacturer prior shipping.

DS51729A-page 10

© 2008 Microchip Technology Inc.

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