MC33348

SEMICONDUCTOR

TECHNICAL DATA

LITHIUM BATTERY

PROTECTION CIRCUIT

FOR

ONE CELL

SMART BATTERY PACKS

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

8

1

18

7

6

5

2

3

4

(Top View)

Cell Voltage

Test

Ground

Charge Pump

Output

PIN CONNECTIONS

Order this document by MC33348/D

Discharge Gate

Drive Output

VCC

Charge Gate

Drive Output

Charge Gate Drive

Common/Discharge

Current Limit

1

MOTOROLA ANALOG IC DEVICE DATA

Lithium Battery Protection

Circuit for One Cell

Battery Packs

The MC33348 is a monolithic lithium battery protection circuit that is

designed to enhance the useful operating life of a one cell rechargeable

battery pack. Cell protection features consist of internally trimmed charge

and discharge voltage limits, discharge current limit detection with a

delayed shutdown, and a virtually zero current sleepmode state when the

cell is discharged. An additional feature includes an on–chip charge pump

for reduced MOSFET losses while charging or discharging a low cell

voltage battery pack. This protection circuit requires a minimum number of

external components and is targeted for inclusion within the battery pack.

This MC33348 is available in standard SOIC 8 lead surface mount

package.

Ordering Information shown on following page.

Typical One Cell Smart Battery Pack

This device contains 1170 active transistors.

VCC

Charge Pump

Output

8

Charge

Gate Drive

Output

Discharge

Gate Drive

Output

4

6

5 Charge

Gate Drive

Common/

Discharge

Current Limit

7

1

3

2

Ground

Test

MC33348

Cell

Voltage

© Motorola, Inc. 1999

Rev 2