MCP73844-820IUN Просмотр технического описания (PDF) - Microchip Technology

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Компоненты Описание

производитель

MCP73844-820IUN

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

Microchip Technology 

MCP73841/2/3/4

3.0 PIN DESCRIPTIONS

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

TABLE 3-1:

MCP73841,

MCP73842

Pin No.

1

2

3

4

5

6

7

8

9

10

PIN DESCRIPTION TABLE

MCP73843,

MCP73844

Pin No.

Name

1

SENSE

2

VDD

3

STAT1

4

EN

—

THREF

—

THERM

5

TIMER

6

VSS

7

VBAT

8

DRV

Function

Charge Current Sense Input

Battery Management Input Supply

Charge Status Output

Logic Enable

Cell Temperature Sensor Bias

Cell Temperature Sensor Input

Timer Set

Battery Management 0V Reference

Battery Voltage Sense

Drive Output

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 mΩ

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.

3.6 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.

3.5 Cell Temperature Sensor Bias

(THREF)

Voltage reference to bias external thermistor for

continuous cell temperature monitoring and

prequalification.

DS21823B-page 10

 2004 Microchip Technology Inc.

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