MCP73853(2004) View Datasheet(PDF) - Microchip Technology

Part Name

Description

MFG CO.

MCP73853
(Rev.:2004)

USB Compatible Li-Ion/Li-Polymer Charge Management Controllers

Microchip Technology 

MCP73853/55

Typical Application

400 mA Lithium-Ion Battery Charger

5V

4.7 µF

3 VDD1

VBAT1 8

2 VSET

10 EN

VBAT2 9

1 STAT1

TIMER 6

5 PROG VSS 4, 7

MCP73855

4.7 µF

0.1 µF

+ Single

–

Lithium-Ion

Cell

Functional Block Diagram

VDD1

VDD2

PROG

EN

Direction

Control

VDD

G = 0.001

4 kΩ

3 kΩ

11 kΩ

VREF

90 Charge Current

kΩ Control Amplifier

+

–

Voltage Control

Amplifier

VREF

110 kΩ

10 kΩ

Charge

Termination

10

kΩ

Comparator

+

–

IREG/12

UVLO

COMPARATOR

+

–

VUVLO

Precondition

Control

VREF

Charge_OK Precondition

Precon

Comp.

Constant-voltage/

Recharge Comp.

600 kΩ

149 kΩ

Power-On

Delay

VREF

1.58 kΩ

300 kΩ

VBAT1

VBAT2

VBAT3

THREF

THERM

TIMER

100 kΩ

50 kΩ

50 kΩ

Bias and

Reference

Generator

VUVLO

VREF(1.2V)

Temperature

Comparators

+

-

+

-

MCP73853 ONLY

VSET

IREG/12

Oscillator

Drv Stat 1

Charge Control,

Charge Timers,

and

Status Logic Drv Stat 2

10.3 kΩ

VSS1

VSS2

VSS3

STAT1

STAT2

MCP73853 ONLY

Charge_OK

DS21915A-page 2

 2004 Microchip Technology Inc.

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