UCC3957MTR-4G4 Datasheet

PMIC - Battery Management


The UCC3957( UCC3957MTR-4G4 ) is a BiCMOS three or four cell lithium-ion battery pack protector designed to operate with external P-channel MOSFETs. Utilizing external P-channel MOSFETs provides the benefits of no loss of system ground in an overdischarge state, and protects the IC as well as battery cells from damage during an overcharge state. An internal state machine runs continuously to protect each lithium-ion cell from overcharge and overdischarge. A separate overcurrent protection block protects the battery pack from excessive discharge currents. If any cell voltage exceeds the overvoltage threshold, the appropriate external P-channel MOSFET is turned off, preventing further charge current. An external N-channel MOSFET is required to level shift to this high side P-channel MOSFET. Discharge current can still flow through the second PFET. Likewise, if any cell voltage falls below the undervoltage limit, the second P-channel MOSFET is turned off and only charge current is allowed. Such a cell voltage condition will cause the chip to go into low power sleep mode. Attempting to charge the battery pack will wake up the chip. A cell count pin (CLCNT) is provided to program the IC for three or four cell operations. UCC3957MTR-4G4 Features • Three or Four Cell Operation• Two Tier Overcurrent Limiting• 30µA Typical Supply Current Consumption• 3.5µA Typical Supply Current in Sleep Mode• Smart Discharge Minimizes Losses in Overcharge Mode• 6.5V to 20V VDD Supply Range• Highly Accurate Internal Voltage Reference• Externally Adjustable Delays in Overcurrent Controller• Detection of Loss of Cell Sense Connections


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Manufacturer information


Seiko Instruments Inc. Is a Japanese company which head office is located in 8, Nakase 1-chome, Mihama-ku, Chiba-shi, Chiba 261-8507, Japan . It’s business lines are: Watches Business Watches, Watch Movements Electronic Components Business Quartz crystals, Micro batteries, etc. Precision Mechatronics Business Inkjet printer heads, Hard disk components, Thermal printers, Compact precision components, Machine tools, FA, Musical instrument accessories, Radiation detection and measurement systems, etc.

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