MCP73827-4.1VUATR Просмотр технического описания (PDF) - Microchip Technology

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MCP73827-4.1VUATR

Single Cell Lithium-Ion Charge Management Controller with Mode Indicator and Charge Current Monitor

Microchip Technology 

MCP73827

3.0 PIN DESCRIPTION

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

Pin

Name

Description

1

SHDN Logic Shutdown

2

GND Battery Management

0V Reference

3

MODE Charge Status Output

4

IMON Charge Current Monitor

5

VBAT Cell Voltage Monitor Input

6

VDRV Drive Output

7

VSNS Charge Current Sense Input

8

VIN

Battery Management

Input Supply

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 Charge Status Output (MODE)

Open-drain drive for connection to an LED for charge

status indication. Alternatively, a pull-up resistor can be

applied for interfacing to a microcontroller. A low

impedance state indicates foldback current limit or con-

trolled current phase. A high impedance indicates con-

stant voltage phase or battery cell disconnected.

3.4 Charge Current Monitor (IMON)

Amplified output of the voltage difference between VIN

and VSNS. A host microcontroller can monitor this out-

put with an A/D converter.

3.5 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.

3.6 Drive Output (VDRV)

Direct output drive of an external P-channel MOSFET

pass transistor for current and voltage regulation.

3.7 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 mΩ sense resistor produces a fast charge current of

1 A, typically.

3.8 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.

DS21704B-page 8

© 2007 Microchip Technology Inc.

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