LinearVoltageRegulators Motorola Semiconductor Products, LinearVoltageRegulators Datasheet - Page 38

• 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 One to Four Cell Battery Packs
MC33345DW, DTB
T A = –25 to +85 C, Case 751D, 948E
circuit that is designed to enhance the useful operating life of
one to 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 a virtually zero current sleepmode
state when the cells are discharged. Additional features
include an on–chip charge pump for reduced MOSFET losses
while charging or discharging a low cell voltage battery pack,
and the programmability for a one to four cell battery pack.
This protection circuit requires a minimum number of external
components and is targeted for inclusion within the battery
pack. The MC33345 is available in standard and low profile 20
lead surface mount packages.
ANALOG AND INTERFACE INTEGRATED CIRCUITS
SELECTOR GUIDE & CROSS REFERENCE
The MC33345 is a monolithic lithium battery protection
Current Limit
Cell 4/V CC /
Program 1
Program 2
Discharge
Charge Pump
Cell 1/V C
Ground
Cell 3
Cell 2
Typical Four Cell Smart Battery Pack
20
19
18
16
10
11
Output
2
14 Discharge
Gate Drive
Current Sense
Output
Common
MC33345
13
Gate Drive
6
Charge
Output
Charge Pump for Reduced Losses with a Low Cell
Programmable for One, Two, Three or Four Cell
Minimum External Components for Inclusion within the
Available in Low Profile Surface Mount Packages
Independently Programmable Charge and Discharge
Charge and Discharge Current Limit Detection with
Cell Voltage Balancing
On–Chip Balancing Resistors
Virtually Zero Current Sleepmode State when Cells are
Limits for Both Voltage and Current
Delayed Shutdown
Discharged
Voltage Battery Pack
Applications
Battery Pack
7
9
Charge
Current Limit
8
Charge
Gate Drive
Common
15
17
3
4
5
1
Cell Voltage
Discharge Voltage
Threshold
Charge Voltage
Threshold
Cell Voltage
Return
Test Input
Fault Output
MOTOROLA
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