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MC33348D-3

Lithium Battery Protection Circuit for One Cell Battery Packs

ON Semiconductor 

MC33348

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.

• Internally Trimmed Charge and Discharge Voltage Limits

• Discharge Current Limit Detection with Delayed Shutdown

• Virtually Zero Current Sleepmode State when Cells are Discharged

• Charge Pump for Reduced Losses with a Low Cell Voltage Battery

Pack

• Dedicated for One Cell Applications

• Minimum Components for Inclusion within the Battery Pack

• Available in a Low Profile Surface Mount Package

Ordering Information shown on following page.

Typical One Cell Smart Battery Pack

Cell

Voltage

1

7 VCC

MC33348

Ground

3

Test

2

Charge Pump 8 Discharge 4 Charge 6

Output

Gate Drive

Gate Drive

Output

Output

5 Charge

Gate Drive

Common/

Discharge

Current Limit

This device contains 1170 active transistors.

© Semiconductor Components Industries, LLC, 2006

1

July, 2006 − Rev. 3

http://onsemi.com

LITHIUM BATTERY

PROTECTION CIRCUIT

FOR ONE CELL

SMART BATTERY PACKS

SEMICONDUCTOR

TECHNICAL DATA

8

1

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO−8)

PIN CONNECTIONS

Cell Voltage 1

8 Charge Pump

Output

Test 2

7 VCC

Ground 3

6

Discharge Gate

Drive Output

4

5

(Top View)

Charge Gate

Drive Output

Charge Gate Drive

Common/Discharge

Current Limit

Publication Order Number:

MC33348/D

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