MC33348 Datasheet, PDF (1/12 Pages) ON Semiconductor – LITHIUM BATTERY PROTECTION CIRCUIT FOR ONE CELL SMART BATTERY PACKS

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Advance Information
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
MC33348
LITHIUM BATTERY
PROTECTION CIRCUIT
FOR
ONE CELL
SMART BATTERY PACKS
SEMICONDUCTOR
TECHNICAL DATA
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
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
PIN CONNECTIONS
Cell Voltage 1
8 ^{Charge Pump}
Output
Test 2
7 VCC
Ground 3
6
Charge Gate
Drive Output
Discharge Gate
Drive Output
4
5
(Top View)
Charge Gate Drive
Common/Discharge
Current Limit
This device contains 1170 active transistors.
This document contains information on a new product. Specifications and information herein
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© Motorola, Inc. 1997
Rev 1
1