Product - Secondary Protection ICs
Product - Secondary Protection ICs
Part Number Cells Protected Stack Function Protection FETs Protection for Note Package
Over-Voltage Under-Voltage Temperature
NT1742 2/3/4-cell - Fuse +/-25mV - - - DFN-8L TSSOP-8L
NT1742 is an accurate secondary battery protection IC for 2/3/4-cell Lithium-Lon/Lithium-Polymer battery packs, on which a precise voltage detection circuit with a specific reference is embedded. 

NT1742 monitors individual cell voltages. If any cell voltage reaches or goes over the specified voltage and lasts for a period longer than the delay time set, NT1742 activates an external MOSFET to blow the three-terminal protection fuse, permanently disabling the battery pack. 

NT1742 has a CTL pin to control the output voltage of the CO pin. The CTL pin can also offer an over-temperature protection via PTC thermistor. If the thermistor temperature exceeds the over-temperature threshold and lasts for a period longer than the delay time, the output pin activates the external MOSFET to blow external fuse. 
*2-, 3- or 4-Cell Secondary Protection 
*High Accuracy Overcharge Voltage:4.225V to 4.50V �b25mV 
*Low Power Consumption:At 3.5V for each cell: 3.5uA max. (+25℃) 
*High Input-Voltage Device 
 -Absolute Maximum Rating: 40V 
 -Operating Voltage range: 4.5V to 26V 
*Output Control Function with CTL Pin 
*Over Temperature Protection with PTC Thermistor-Optional 
*High Ripple Rejection Ability for Power Supply 
*Package: TSSOP-8L、DFN-8L 
*Notebook PCs 
*Portable Instrumentation 
*Medical and Test Equipment