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NB7400 Series
2-Cell to 4-Cell Li-ion Battery Second Protection IC with VR

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  • Description

    The NB7400 is an overcharge protection IC for 2 to 4 serial cell Li-ion or Li-polymer secondary battery.

    The NB7400 provides high-accuracy voltagedetection circuits, a delay circuit, and a voltage regulator for an external real-time clock (RTC).

    It also comes with the shut-down detection circuit that reduces the supply current to a minimum.

  • Spec
    Operating Input Voltage 4.0 V ~ 25 V or VC1 +5 V (Maximum Rating: 32 V)
    Number of Cells 2,3,4
    Supply Current Typ. 2.5 µA (VCELLn = 4.15V)
    Standby Current Max. 0.2 µA
    Shutdown Detection Voltage 2.0 V ～ 3.0 V ±0.05 V (0.1V Steps)
    Overcharge Detection Voltage 4.20 V ～ 4.85 V (0.005 V Steps)
    Overcharge Detection Voltage Accuracy ±20 mV
    Overcharge Detection Delay Time 1.5 s, 2 s, 4 s, 6 s
    The delay time can be reduced down to approx. 1/80 by applying a voltage of 4 V ± 0.2 V to the VDD ‒ VC1 pins.
    Overcharge Restoration Voltage VDET1 ~ VDET1−0.4 V (0.05 V Steps)
    Package DFN(PL)2020-8-GH
    VROUT (built-in voltage regulator) pin output voltage range 1.5 V ~ 3.3 V (0.1 V Steps)
    VROUT (built-in voltage regulator) pin output voltage accuracy ±2.0%
    Download Datasheet

    Protections / Functions

    Temperature Protection Reset Alarm Cell Balance Cascadable Open Wire Detection Wakeup Short-circuit Current Detection Delay Time Shortening
    Functional Description
  • Technical
    Documents

    • Typical Application

      4-cell Protection Circuit

      Note: Connect the pins in the following order: B-, B3, B2, B1, and B+.
      RVDD: 100 Ω, R1~4: 330 Ω, CVDD,C1~4,CVROUT: 0.1 µF

  • Quality &
    Packages
    Product Name Compatibility Package Marking Reliability
    NB7400GHxxxxxE4S
    • gradeConsumer
    		 DFN(PL)2020-8-GH See datasheet NB7400GHS
    • Refer to the datasheets for the details on the product.
    • The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
  • Sample / Buy
Similar Products

Download Datasheet

Functional Description

Temperature Protection Temperature Protection
Reset Reset Function
Alarm Alarm Function
Cell Balance Cell Balance Function
Cascadable Cascade Connect Function
Open Wire Detection Open Wire Detect Function
Wakeup Wakeup Function
Short-circuit Current Detection Short-circuit Current Protection
Delay Time Shorting Output Delay Time Short Function

For more details, please refer to "Protecting Li-ion Batteries: Functions and Advantages".

Search for similar products under conditions below.

Category:Lithium-ion Battery Protection ICs

Features Second Protection
Cell 2,3,4
Functions Delay Time Shortening