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Power Management
NJW4120

Lithium-ion Battery Charger Controller IC with Timer

Features
  • 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 OutlinePinsMaterial Declaration (RoHS/Halogen)Terminal FinishWeight(mg) (Reference)Reflow solderingFlow soldering Iron solderingPacking ConditionMSLSolder Foot Print
NJW4120M download
DMP20
20 Sn2Bi 185 Yes Yes Yes Non dry pack 1
NJW4120V download
SSOP20
20 Sn2Bi 87 Yes - Yes Non dry pack 1
Sample & Buy
Part NumberPackagesStatusPacking SpecificationSampleBuy
NJW4120M DMP20 (Active)
NJW4120V SSOP20 (Active)
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