MCP73855T datasheet(15/24 Pages) MICROCHIP

Part #	MCP73855T

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

PDF	24 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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15 / 24 page

 2004 Microchip Technology Inc.

DS21915A-page 15

MCP73853/55

6.0

APPLICATIONS

The MCP7385X devices are designed to operate in

conjunction with a host microcontroller or in stand-

alone applications. The MCP7385X devices provide

the preferred charge algorithm for Li-Ion/Li-Polymer

cells, constant current followed by constant voltage.

Figure 6-1 depicts a typical stand-alone application

circuit,

while

Figures

6-2

and

6-3

depict

the

accompanying charge profile.

FIGURE 6-1:

Typical Application Circuit.

FIGURE 6-2:

Typical Charge Profile.

STAT1

VSET

VSS3

VDD1

VDD2

VSS2

TIMER

PROG

VBAT3

VBAT2

VBAT1

CTIMER

RPROG

RT1

RT2

Single

Lithium-Ion

Cell

VSS1

MCP73853

Regulated Wall Cube

USB Power Bus

Regulation

Voltage

(VREG)

Regulation

Current

(IREG)

Transition

Threshold

(VPTH)

Precondition

Current

(IPREG)

Precondition

Safety Timer

Fast Charge

Safety Timer

Elapsed Time

Termination Timer

Charge

Voltage

Preconditioning

Mode

Constant-current

Mode

Constant-voltage

Mode

Charge

Current

Termination

Current

(ITERM)

MCP73855T Datasheet(PDF) 15 Page - Microchip Technology

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