Linear Charger for Low Voltage Battery

BD71631QWZ is a linear charger for low charge voltage battery. The battery charge voltage, charge current, termination current are set using external resisters.

ROHM and NGK INSULATORS, LTD. have collaborated on the ultimate maintenance-free IoT device that combines ROHM’s Nano Energy™ ultra-low current consumption technology for power supply ICs with NGK’s chip-type ceramic rechargeable battery EnerCera®.
EnerCera® × Nano Energy™ Collaboration Page

Data Sheet Buy * Sample *
* This is a standard-grade product.
For Automotive usage, please contact Sales.

Product Detail

Part Number | BD71631QWZ-TR
Status | Recommended
Package | UMMP10LZ1824
Unit Quantity | 2500
Minimum Package Quantity | 2500
Packing Type | Taping
RoHS | Yes




Supply Voltage(Min.)[V]

2.9/4.0 (Charge Current 30mA/300mA)

Supply Voltage(Max.)[V]


Charge Voltage [V]


Operating Temperature (Min.)[°C]


Operating Temperature (Max.)[°C]


Package Size [mm]

2.4x1.8 (t=0.4)

Find Similar


  • Adjustable Termination Current: 50μA to 10mA
  • Low Quiescent Battery Current: IBATT = 0μA (typ)
  • NTC Thermistor Input for Temperature Qualified Charging
  • Open-Drain Charge indicator LED Output
  • Fixed 10 hour Safety Timer
  • Thermal Shutdown
  • Under Voltage Lockout Protection
  • Battery Over Voltage Protection


    • Evaluation Board
    • BD71631QWZ-EVK-001
    • This EVK is for evaluating the linear charging IC BD71631QWZ, and charges 4.2V from the 5V input voltage. BD71631QWZ accepts a power supply input range of 2.9V to 5.5V and generates a charging battery voltage ranging from 2.0V to 4.7V using external resistors. If the charging current is VIN ≥ 4V, it can be used up to 300mA under the condition of VIN-VOUT ≥ 1V and up to 100mA under the condition of VIN-VOUT ≥ 0.3V. If 2.9V ≤ VIN ≤ 5.5V, it can be used up to 30mA under the condition of VIN-VOUT ≥ 0.3V. The charging current can be set with an external resistor. The termination current can be set from 50μA to 10mA using external resistors. Additional protection functions include a built-in Fixed 10-hour Safety Timer, UVLO(Under Voltage Lock Out), TSD(Thermal Shutdown Detection), and Battery Over Voltage Protection.

  • User's Guide Buy
    • Reference Design
    • REFLVBMS001-EVK-001
    • This collaboration board charges the EnerCera® Pouch rechargeable battery manufactured by NGK, and outputs the power stored in the EnerCera® by stepping down and stabilizing it. The Power Supply and RESET ICs with Nano Energy™ echnology maximizes the battery life.

  • User's Guide Buy