MCP73844 datasheet(10/26 Pages) MICROCHIP

Part #	MCP73844

Description	Advanced Single or Dual Cell Lithium-Ion/ Lithium-Polymer Charge Management Controllers

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Manufacturer	MICROCHIP [Microchip Technology]

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10 / 26 page

MCP73841/2/3/4

DS21823D-page 10

 2003-2013 Microchip Technology Inc.

3.0

PIN DESCRIPTIONS

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

TABLE 3-1:

PIN DESCRIPTION TABLE

3.1

Charge Current Sense Input

(SENSE)

Charge current is sensed via the voltage developed

across an external precision sense resistor. The sense

resistor must be placed between the supply voltage

(VDD) and the external pass transistor (Q1). A 220 m

sense resistor produces a fast charge current of

500 mA, typically.

3.2

Battery Management Input Supply

(VDD)

A supply voltage of [VREG(Typ) + 0.3V] to 12V is

recommended. Bypass to VSS with a minimum of

4.7 µF.

3.3

Charge Status Output (STAT1)

Current limited, open-drain drive for direct connection

to a LED for charge status indication. Alternatively, a

pull-up resistor can be applied for interfacing to a host

microcontroller.

3.4

Logic Enable (EN)

Input to force charge termination, initiate charge, clear

faults or disable automatic recharge.

3.5

Cell Temperature Sensor Bias

(THREF)

Voltage reference to bias external thermistor for

continuous

cell

temperature

monitoring

and

prequalification.

3.6

Cell Temperature Sensor Input

(THERM)

Input for an external thermistor for continuous cell-

temperature monitoring and pre-qualification. Apply a

voltage equal to 0.85V to disable temperature-sensing.

3.7

Timer Set (TIMER)

All safety timers are scaled by CTIMER/0.1 µF.

3.8

Battery Management 0V Reference

(VSS)

Connect to negative terminal of battery.

3.9

Battery Voltage Sense (VBAT)

Voltage sense input. Connect to positive terminal of

battery. Bypass to VSS with a minimum of 4.7 µF to

ensure loop stability when the battery is disconnected.

A precision internal resistor divider regulates the final

voltage on this pin to VREG.

3.10

Drive Output (DRV)

Direct output drive of an external P-channel MOSFET

for current and voltage regulation.

MCP73841,

MCP73842

Pin No.

MCP73843,

MCP73844

Pin No.

Name

Function

1

SENSE

Charge Current Sense Input

22

VDD

Battery Management Input Supply

3

STAT1

Charge Status Output

4

EN

Logic Enable

5

—

THREF

Cell Temperature Sensor Bias

6

—

THERM

Cell Temperature Sensor Input

75

TIMER

Timer Set

86

VSS

Battery Management 0V Reference

97

VBAT

Battery Voltage Sense

10

8

DRV

Drive Output

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