LinearVoltageRegulators Motorola Semiconductor Products, LinearVoltageRegulators Datasheet - Page 39

• Manufacturer Part Number: LinearVoltageRegulators
• Description: Analog And Interface Integratedcircuits Selector Guide & Cross Reference
• Manufacturer: Motorola Semiconductor Products

Battery Pack ICs
Lithium Battery Protection Circuit for Three or Four Cell Battery Packs
MC33346DW, DTB
T A = –40 to +85 C, Case 751E, 948H
cuit 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 bal-
ancing 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 cir-
cuit 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 sur-
face mount packages.
MOTOROLA
68
The MC33346 is a monolithic lithium battery protection cir-
(continued)
Current Limit
Cell 4/V CC /
Discharge
Cell
Program
Ground
Cell 3
Cell 2
Cell 1
Temp
Typical Four Cell Smart Battery Pack
24
23
22
15
11
3
8
Current
Sense
Common
7
17
A–to–D
Converter
Period
Charge
Current
Limit
6
18
V C
Logic
Supply
MC33346
Discharge
Gate Drive
Output
14
13
Address
Input
Programmable for Three or Four Cell Applications
Minimum External Components for Inclusion within the
Available in Low Profile Surface Mount Packages
Independently Programmable Charge and Discharge
Delayed Current Shutdown
Cell Voltage Balancing with On–Chip Resistors
Six Wire Microcontroller Interface Bus
Data Output for Reference, Voltage, Current, and
Microcontroller Time Reference Output for Gas Gauging
Virtually Zero Current Sleepmode State when Cells are
Limits for Both Voltage and Current
Temperature
Discharged
Battery Pack
ANALOG AND INTERFACE INTEGRATED CIRCUITS
Charge
Gate Drive
Output
20
10
Data
Input
9
Charge Gate
Turn Off/
Test Input
Charge
Gate Drive
Common
21
16
19
12
Cell Voltage
2
Discharge Voltage
Threshold
4
Charge Voltage
Threshold
5
Cell Voltage
Return
1
Data Output
Ref/V/I/T
Reference Clock Output
Interrupt Output
SELECTOR GUIDE & CROSS REFERENCE