MC33346 Datasheet, PDF (1/3 Pages) Motorola, Inc – LITHIUM BATTERY PROTECTION CIRCUIT PROTECTION CIRCUIT THREE OR FOUR CELL SMART BATTERY PACKS

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MC33346
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Lithium Battery Protection
Circuit for Three or Four Cell
Battery Packs
The MC33346 is a monolithic lithium battery protection circuit that is
designed to enhance the useful operating life of three or four cell
rechargeable battery packs. Cell protection features consist of
independently programmable charge and discharge limits for both voltage
and current with a delayed current shutdown, cell voltage balancing with
on–chip balancing resistors, and virtually zero current sleepmode state
when the cells are discharged. Additional features consists of a six wire
microcontroller interface bus that can selectively provide a pulse output that
represents the internal reference voltage, cell voltage, cell current and
temperature, as well as control the states of four internal balancing and two
external MOSFET switches. A microcontroller time reference output is
available for gas gauge implementation. This protection circuit requires a
minimum number of external components and is targeted for inclusion within
the battery pack. The MC33346 is available in standard and low profile 24
lead surface mount packages.
LITHIUM BATTERY
PROTECTION CIRCUIT
FOR
THREE OR FOUR CELL
SMART BATTERY PACKS
24
1
24
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751E
(SO–24L)
DTB SUFFIX
PLASTIC PACKAGE
CASE 948H
(TSSOP–24)
• Independently Programmable Charge and
Discharge Limits for Both Voltage and
Current
• Delayed Current Shutdown
• Cell Voltage Balancing with On–Chip
Resistors
• Six Wire Microcontroller Interface Bus
• Data Output for Reference, Voltage, Current,
and Temperature
• Microcontroller Time Reference Output for
Gas Gauging
• Virtually Zero Current Sleepmode State when
Cells are Discharged
• Programmable for Three or Four Cell
Applications
• Minimum External Components for Inclusion
within the Battery Pack
• Available in Low Profile Surface Mount
Packages
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC33346DW
MC33346DTB
TA = –40° to +85°C
SO–24L
TSSOP–24
Typical Four Cell Smart Battery Pack
Cell 4/VCC/
Discharge
Current Limit
3
Cell 3
24
Cell 2
23
Cell 1
22
Ground
Cell 15
Program
11
Temp
8
Current
Sense
Common
7
Charge
Current
Limit
6
Discharge
Gate Drive
Output
14
MC33346
17
A–to–D
Converter
Period
18
VC
Logic
Supply
13
Address
Input
Charge Charge
Gate Drive Gate Drive
Output Common
20
21Cell _Voltage
2
Discharge Voltage
Threshold
4
Charge Voltage
Threshold
5
Cell Voltage
Return
1
Data Output
Ref/V/I/T
16
Reference Clock Output
19
Interrupt Output
12
10
9
Data
Charge Gate
Input
Turn Off/
Test Input
This device contains 4760 active transistors.
This document contains information on a product under development. Motorola reserves the
right to change or discontinue this product without notice.
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Issue 1
1