TC3827

TC3827-2 12/12/00

© 2001 Microchip Technology Inc.

DS21558A

Lithium-Ion Battery Charger

FEATURES

s Low Power Dissipation

s Shutdown Current: 1

s Space-Saving 8-Pin MSOP Package

s No Inductor Required

s 1% Overall System Accuracy

s Charge Current Monitor Output

s Charge Status Indicator Output

s Foldback Current Limiting

s –20

Temperature Range

TYPICAL APPLICATIONS

s PDAs

s Cradle Chargers

s Li-Ion Battery Chargers

s Desktop Computers

s Hand-Held Instruments

s Cellular Telephones

s Battery Operated Devices

s Self-Charging Battery Packs

GENERAL DESCRIPTION

The TC3827 is a battery charger controller for a single

cell Li-Ion battery. Using an external PMOS transistor, safe

and fast charging of a single Li-Ion cell is accomplished.

Features include over-current foldback, charge current

monitor, and charge status LED indicator output. An overall

system accuracy of 1% ensures that the cell capacity is fully

utilized without cycle life degradation. An external resistor

sets charge current.

The TC3827 operates with an input voltage range from

4.5V to 5.5V. It is specified over the ambient operating

temperature range of –20

°C to +85°C and is available in a

space-saving 8-Pin MSOP.

ORDERING INFORMATION

Temperature

Part No.

Package

Range

TC3827-4.1VUA

8-Pin MSOP

–20

°C to +85°C

TC3827-4.2VUA

8-Pin MSOP

–20

°C to +85°C

8-Pin MSOP

PIN CONFIGURATION

GND

MODE

SHDN 1

2

3

4

8

7

6

5

TC3827

RSENSE

NDP6020P

PMOS

+5 V

IN

V

SNS

V

DRV

GND

V

IN

V

OUT

SHDN

IMON

MODE

LED

10

µF

Controller

TC3827

Li-Ion

22

µF

+

–

SHDN

MODE

IMON

FUNCTIONAL BLOCK DIAGRAM

TYPICAL APPLICATION CIRCUIT

E/A

SHDN

GND

V

+

–

E/A

+

–

C/A

+

–

CONTROL

BLOCK

K

MODE

TC3827

DRV

Figure 1. TC3827 Typical Application Circuit