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  ON Semiconductor Electronic Components Datasheet  

MC33351A Datasheet

Lithium Battery Protection Circuit

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MC33351A
Advanced Information
Lithium Battery Protection
Circuit for Three Battery
Packs
The MC33351A is a monolithic lithium battery protection circuit that is
http://onsemi.com
designed to enhance the useful operating life of three cell rechargeable
battery packs. The MC33351A is specifically designed to be placed in a
MARKING
lithium battery pack where the battery cells continuously power it. In order
to maintain cell operation within specified limits, the protection circuit
20
DIAGRAMS
senses cell voltages, and discharge current, and correspondingly controls
mthe state of two P–channel MOSFET switches. These switches are
oconnected in series with the positive terminal of the third cell and the
positive terminal of the battery pack. During a fault condition, the
.cMC33351A open circuits the pack by turning off one of these MOSFET
1
TSSOP–20
DTB SUFFIX
CASE 948E
MC35
1A1
ALYW
switches.
Features
USelectable Charge Interrupt Voltage Sensing Mode for Precise Cell
t4Voltage Measurements
Programmable Overvoltage Delay
A
WL, L
YY, Y
WW,W
= Assembly Location
= Wafer Lot
= Year
= Work Week
eChoice of Discharge Current Limit Sensing Elements consisting of
either Low–Side Resistor or High–Side MOSFET Switches
eProgrammable Discharge Current Limit Threshold and Shutdown Delay
PIN CONNECTIONS
hSelectable Cell Voltage Balancing
Charge Inhibit Input 1
20 Balance 1
Virtually Zero Current Sleepmode State when Cells are Discharged
SMinimum External Components for Inclusion within the Battery Pack
taAvailable in Low Profile Surface Mount Package
Typical Three Cell Smart Battery Pack
aVCC/
High–Side
.DDischarge
Current Limit
16
Discharge Gate
Drive Output
7
Charge Gate
Drive Output
9
Charge and
Discharge Gate
Drive Common
8
17
wCell 3
18
Balance 3
w19
Cell 2
m12
w oBalance 2
.c14
Cell 1/VC 15
UBalance 1
t420
Ground 13
Overvoltage
eShutdown
eDelay
hCharge
3
Interrupt
SMode Select
6
11
taHigh–Side
Discharge Current
aLimitThreshold
MC33351A
4
Discharge
Current Limit
Shutdown Delay
5
Low–Side
Current
Limit Input
1
Charge
Inhibit
Input
Undervoltage
Fault Output
10
2
Discharge
Inhibit
Input
Discharge Inhibit/
Test Input
Overvoltage
Shutdown Delay
Discharge Current Limit
Shutdown Delay
Low–Side Discharge
Current Limit Input
Charge Interrupt
Mode Select
Discharge
Gate Drive Output
Charge and Discharge
Gate Drive Common
Charge
Gate Drive Output
Undervoltage
Fault Output
2
3
4
5
6
7
8
9
10
19 Balance 3
18 Cell 3
17 NC
VCC/High Side
16 Discharge Current
Limit
15 Cell 1/VC
14 Balance 2
13 Ground
12 Cell 2
11
High–Side
Discharge Current
Limit Threshold
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
MC33351ADTB–1 TSSOP–20 75 Units/Rail
MC33351ADTB–1R2 TSSOP–20 2500 Tape/Reel
www.D© Semiconductor Components Industries, LLC, 2000
1
Publication Order Number:
June, 2000 – Rev. 3
MC33351A/D


  ON Semiconductor Electronic Components Datasheet  

MC33351A Datasheet

Lithium Battery Protection Circuit

No Preview Available !

MC33351A
Smart Battery Pack with Low–Side Discharge Current Sensing, Charge Interrupt Voltage Sensing, and Cell Voltage Balancing
Discharge Switch Q2
4.7 M
Charge Switch Q1
VCC/
High–Side
Discharge
Current Limit
16
MC33351A
Discharge
Charge
RG Gate Drive RG Gate Drive
Output
Output
79
Charge and
Discharge Gate
Drive Common
8
CI
Cell 3
Cell 2
Cell 1
17
Cell 3
18
Balance 3
19
Cell 2
12
Balance 2
14
Cell 1/VC
15
Balance 1
20
Ground
13
10 k
10 k
10 k
Cell
Selector
Floating
Over/Under
Cell Voltage
Detector
&
Reference
R1
R2
R3
Ck
Oscillator
Ck
En
Over/Under
Data Latch
&
Control Logic
Undervoltage
Fault Output
10
Overvoltage
Shutdown
Delay
3
Cell Voltage
Balancing
Logic
6
Charge Interrupt
Mode Select
11
High–Side
Discharge Current
Limit Threshold
4
Discharge
Current Limit
Shutdown Delay
Discharge Current
Limit Detector
Cdly
Rlim(LS)
5
Low–Side
Discharge Current
Limit Input
VCC
Charge/Discharge
Gate Drivers
10 k VC 10 k
Sense
Enable
1
Charge
Inhibit Input
2 5.1 k
Discharge Inhibit Input
RT
+
22 m fd CT
Figure 1. Control Logic Inputs from
Microcontroller Output Ports
http://onsemi.com
2


Part Number MC33351A
Description Lithium Battery Protection Circuit
Maker ON Semiconductor
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MC33351A Datasheet PDF






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