MCP73826 datasheet(8/24 Pages) MICROCHIP

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MCP73826

DS21705A-page 8

 2002 Microchip Technology Inc.

3.0

PIN DESCRIPTION

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

Pin Function Table.

3.1

Logic Shutdown (SHDN)

Input to force charge termination, initiate charge, or ini-

tiate recharge.

3.2

Battery Management 0V Reference

(GND)

Connect to negative terminal of battery.

3.3

Cell Voltage Monitor Input (VBAT)

Voltage sense input. Connect to positive terminal of

battery. Bypass to GND with a minimum of 10 µF to

ensure loop stability when the battery is disconnected.

A precision internal resistor divider regulates the final

voltage on this pin to VREG.

3.4

Drive Output (VDRV)

Direct output drive of an external P-channel MOSFET

pass transistor for current and voltage regulation.

3.5

Battery Management Input Supply

(VIN)

A supply voltage of 4.5V to 5.5V is recommended.

Bypass to GND with a minimum of 10 µF.

3.6

Charge Current Sense Input (VSNS)

Charge current is sensed via the voltage developed

across an external precision sense resistor. The sense

resistor must be placed between the supply voltage

(VIN) and the source of the external pass transistor. A

50 m

Ω sense resistor produces a fast charge current of

1A, typically.

Name

Description

SHDN

Logic Shutdown

GND

Battery Management

0V Reference

VBAT

Cell Voltage Monitor Input

4VDRV

Drive Output

5VIN

Battery Management

Input Supply

6VSNS

Charge Current Sense Input

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