MCP73842T-420I/UN Ver la hoja de datos (PDF) - Microchip Technology

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MCP73842T-420I/UN

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

Microchip Technology 

MCP73841/2/3/4

6.0 APPLICATIONS

The MCP7384X is designed to operate in conjunction

with either a host microcontroller or in stand-alone

applications. The MCP7384X provides the preferred

charge algorithm for Lithium-Ion and Lithium-Polymer

cells: constant-current followed by constant-voltage.

Figure 6-1 depicts a typical stand-alone application

circuit, while Figure 6-2 depicts the accompanying

charge profile.

Voltage

Regulated

Optional

Wall Cube

Reverse

Blocking

Diode

RSENSE

Q1

+

-

SENSE 1

10 DRV

VDD 2

9 VBAT

STAT1

3

MCP73841 8 VSS

EN 4

RT1 THREF 5

7 TIMER

6 THERM

CTIMER

RT2

Battery

Pack

FIGURE 6-1:

Typical Application Circuit.

Preconditioning

Phase

Constant-Current

Phase

Regulation Voltage

(VREG)

Regulation Current

(IREG)

Constant-Voltage

Phase

Transition Threshold

(VPTH)

Charge

Voltage

Precondition Current

(IPREG)

Termination Current

(ITERM)

Charge

Current

Precondition

Safety Timer

Fast Charge

Safety Timer

Elapsed Time

Termination Timer

FIGURE 6-2:

Typical Charge Profile.

 2004 Microchip Technology Inc.

DS21823B-page 15

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