Description
The NT1777 series are the 2/3/4/5-cell
protection IC with temperature protection for
lithium-ion/lithium-polymer/lithium-iron phosphate
rechargeable battery pack. The high accuracy
voltage, current detector and delay time circuits
are built in NT1777 series with state-of-the-art
design and process.
The NT1777 series have three types of
discharge over-current protection and one type of
charge over-current protection.
The NT1777 series have three types of overtemperature during charging, over-temperature
during discharging and under-temperature during
charging protection.

Features
 High accuracy voltage detection circuit
 Over-charge detection : 25mV
 Over-discharge detection : 80mV
 Discharge over-current-1 detection : 10%
 Discharge over-current-2 detection : 10%
 Load short-circuiting detection : 10%
 Charge over-current detection : 8mV/10mV
 Temperature detection : 4℃
 High withstand voltage
 Absolute maximum rating: 30V
 Operating voltage range: 3.5V to 25V
 Low power consumption
 Supply current: 6.6uA max. (Ta=+25℃)
 Delay times of over-charge, load short-circuiting, charge
over-current and over/under temperature are generated
by an internal circuit (fixed).
 Delay times of over-discharge, discharge over-current-1
and -2 are controlled by external capacitors.
 Built-in breaking wire detector function
 Package: 16 pin TSSOP
 Lead-free, Sn 100%, Halogen-free

Applications
 Lithium-ion rechargeable battery pack
 Lithium-polymer rechargeable battery pack
 Lithium-iron phosphate rechargeable battery pack