User manual

MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide

2.3 GETTING STARTED

The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board is fully

assembled and tested for charging LiFePO

batteries.

2.3.1 Power Input and Output Connection

2.3.1.1 POWERING THE MCP73X23 LITHIUM IRON PHOSPHATE BATTERY

CHARGER EVALUATION BOARD

1. Connect the positive battery terminal to V

BAT+

and negative battery terminal to

BAT-

2. Connect the DC power supply Negative Terminal to V

3. Connect the DC power supply Positive Terminal to V

4. It should initiate the battery charging cycle when the power source is present and

BAT

is below recharge threshold. For example, When V

REG

is 3.6V, V

BAT

needs

to be lower than 3.42V to initiate the charge cycle.

5. The charging status table is available on Table 2-2.

6. The fast charge current is preset at 500 mA and can be increased to 1A by

connecting PROG via to ground.

FIGURE 2-1: Board Top Assembly.

Note 1: The MCP73123 circuit is designed to charge one-cell LiFePO

battery

and the MCP73223 circuit is designed to charge two-cell LiFePO

battery.

2: The LiFePO

battery can be replaced with test circuit or electronic load

that can sink current with DC power supply. Refer to Figure 2-3.

Note: Fast Charge Current can be programmed with various resistors based on

Figure 2-2 and Table 2-2.