Lithium-ion Battery Charger Controller IC with Timer

Data Sheet


  • Charge Control Feedback by Photocoupler
  • Adjustable Charge Voltage
  • Adjustable Pre-Charge and Full Charge Current
  • Temperature Monitor
  • Over Charge Timer
  • Internal Re-Charge function
  • Delay timers and Hysteresis inputs for high noise immunity
  • Over Discharge Battery Detect
  • Over Voltage Protection
  • Bi-CMOS Technology
  • Package Outline (DMP20, SSOP20)

General Description

The NJW4120 is a 1-cell and 2-cell lithium ion battery charge control IC with a built-in AC-DC secondary side control feature. Using a photocoupler to directly feed back optimum charging voltage and current information to the primary side, it increases energy efficiency, makes possible a smaller charger, and conserves energy. Charging current can be freely set and therefore it is possible to optimize charging according to battery capacity. As safety features it has over voltage, over discharge, temperature detection and a charge over timer. Also, the adaptor and the charge control circuit are integrated on one chip.

Package Information

Part Number Package Outline PLP Pins Terminal Finish Weight(mg) (Reference) Reflow soldering Flow soldering Iron soldering Packing Condition MSL Solder Foot Print
NJW4120M DMP20 - 20 Sn2Bi 185 Yes Yes Yes Non dry pack 1
NJW4120V SSOP20 - 20 Sn2Bi 87 Yes - Yes Non dry pack 1

Sample & Buy

Part Number Packages Status Packing Specification Sample Buy
NJW4120M DMP20 (Active) Contact Us Stock Check
NJW4120V SSOP20 (Active) Contact Us Stock Check