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MC33351A

ON Semiconductor
Part Number MC33351A
Manufacturer ON Semiconductor
Description Lithium Battery Protection
Published Mar 2, 2006
Detailed Description MC33351A Advanced Information Lithium Battery Protection Circuit for Three Battery Packs The MC33351A is a monolithic l...
Datasheet PDF File MC33351A PDF File

MC33351A
MC33351A

Overview
MC33351A Advanced Information Lithium Battery Protection Circuit for Three Battery Packs The MC33351A is a monolithic lithium battery protection circuit that is designed to enhance the useful operating life of three cell rechargeable battery packs.
The MC33351A is specifically designed to be placed in a lithium battery pack where the battery cells continuously power it.
In order to maintain cell operation within specified limits, the protection circuit senses cell voltages, and discharge current, and correspondingly controls the state of two P–channel MOSFET switches.
These switches are connected in series with the positive terminal of the third cell and the positive terminal of the battery pack.
During a fault condition, the MC33351A open circuits the pack by turning off one of these MOSFET switches.
Features http://onsemi.
com MARKING DIAGRAMS 20 1 TSSOP–20 DTB SUFFIX CASE 948E • Selectable Charge Interrupt Voltage Sensing Mode for Precise Cell • Programmable Overvoltage Delay • Choice of Discharge Current Limit Sensing Elements consisting of • • • • • Voltage Measurements either Low–Side Resistor or High–Side MOSFET Switches Programmable Discharge Current Limit Threshold and Shutdown Delay Selectable Cell Voltage Balancing Virtually Zero Current Sleepmode State when Cells are Discharged Minimum External Components for Inclusion within the Battery Pack Available in Low Profile Surface Mount Package Typical Three Cell Smart Battery Pack VCC/ High–Side Discharge Current Limit 16 17 Cell 3 18 Balance 3 19 Cell 2 12 Discharge Gate Drive Output 7 Balance 2 14 w w .
D w Charge Gate Drive Output 9 t a S a e h t e U 4 A WL, L YY, Y WW,W .
c 1 m o MC35 1A1 ALYW = Assembly Location = Wafer Lot = Year = Work Week PIN CONNECTIONS 20 Balance 1 19 Balance 3 18 Cell 3 17 NC 16 Discharge Current Limit VCC/High Side Charge Inhibit Input Charge and Discharge Gate Drive Common 8 Discharge Inhibit/ Test Input 2 Overvoltage Shutdown Delay 3 Discharge Current Limit...


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