LinearVoltageRegulators Motorola Semiconductor Products, LinearVoltageRegulators Datasheet - Page 40

• 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 or Two Cell Battery Packs
MC33347D, DTB
T A = –25 to +85 C, Case 751B, 948F
cuit that is designed to enhance the useful operating life of
one or two 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, continuous cell voltage balancing with the
choice of on–chip or external balancing resistors, and a virtu-
ally zero current sleepmode state when the cells are dis-
charged. Additional features include an on–chip charge
pump for reduced MOSFET losses while charging or dis-
charging a low cell voltage battery pack, and the programma-
bility for one or two cell battery pack. This protection circuit
requires a minimum number of external components and is
targeted for inclusion within the battery pack. This MC33347
is available in standard and low profile 16 lead surface mount
packages.
ANALOG AND INTERFACE INTEGRATED CIRCUITS
SELECTOR GUIDE & CROSS REFERENCE
The MC33347 is a monolithic lithium battery protection cir-
(continued)
Cell Program/
Test
Current Limit
Charge Pump
Discharge
Balance 2
Balance 1
Ground
V Cell2 /
V Cell 1
Output
Typical Two Cell Smart Battery Pack
13
16
4
2
3
1
15
Gate Drive
Discharge
Current Sense
Output
Common
MC33347
14
Gate Drive
Charge
Output
9
Charge Pump for Reduced Losses with a Low Cell
Programmable for One or Two Cell Applications
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
Continuous Cell Voltage Balancing
On–Chip or External Balancing Resistors
Virtually Zero Current Sleepmode State when Cells are
Limits for Both Voltage and Current
Delayed Shutdown
Discharged
Voltage Battery Pack
Battery Pack
10
12 11 Charge
V CC /
Overcharge
Current Limit
Gate Drive
Common
Cell Voltage
6
Discharge Voltage
Threshold
7
Charge Voltage
Threshold
8
Cell Voltage
Return
5
MOTOROLA
69