Product 產品介紹
Product 產品介紹
NT1721
NT1721
Part Number Cells Protected Overvoltage Threshold(v) Protection FETs Protection for Shutdown Current(uA) Package
Undervoltage Overcurrent Short-circuit
NT1721 2s-cell +/-25mV N-MOS +/-80mV DOC:+/-20mV -- < 0.1uA TSSOP-8
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Overview
The NT1721 protects lithium-ion/lithium-polymer rechargeable battery in the event of overcharge, overdischarge and discharge overcurrent for a 2-serial-cell lithium-ion/lithium- polymer battery pack.

The NT1721 contains high-accuracy voltage detection circuits and delay circuits. 
If any of the above abnormal conditions occur. NT1721 will turn off its external MOSFETs to protect the battery pack. 

NT1721 will enter into power down mode when overdischarge protection occurs to minimize the current consumption. 
NT1721 will charge the external capacitor for delay time control. 

The 0 V battery charging function is available for NT1721 by customer’s request. 
Features
*High Detection Accuracy 
 -Overcharge Detection: ±25 mV 
 -Overdischarge Detection: ±80 mV 
 -Discharge Overcurrent Detection: ±20 mV 
*Programmable Delay Time 
*High Input-Voltage Device 
 -Absolute Maximum Rating: 20V 
 -Operating Voltage range: 2V to 18V 
*Low Power Consumption 
 -Operation Mode: 4uA Typ. 
 -Power-Down Mode: 0.1uA Max. 
*Optional 0 V Battery Charging Function  
*Package: 8-Pin TSSOP
 
Applications
*Portable Instrumentation 
*Portable DVD 
*DSC