NB7140 Series
1-cell Li-ion Battery Protection IC with Forced Standby and Built-In System Reset Function

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  • Description

    The NB7140 is a 1-cell Li-ion / polymer battery protection IC which provides over-charge, overdischarge, charge / discharge overcurrent and short circuit protection, with built-in system reset function. The NB7140 can shift to the Forced Standby Mode by an external signal to STB pin to reduce own current consumption.

    Low voltage and high accuracy overcurrent detection achieves a heat reduction on board by using low sense resistor. Low operating current and standby current can prolong the battery life even when its capacity is small, and the forced standby mode with STB pin too can prolong the small battery life.

    System reset is possible by turning off the charge FET / discharge FET during MCU runaway with the RST pin.

  • Spec
    Operating Input Voltage 1.5 V to 5.0 V (Maximum Rating: 12 V)
    Number of Cells 1
    Supply Current Typ. 1.5 µA
    Standby Current Max. 0.04 µA (VDET2 Latch type), Max. 0.2 µA (VDET2 Auto release type)
    Overcharge Detection Voltage 4.2 V to 4.7 V (0.005 V Step)
    Overcharge Detection Voltage Accuracy ±15 mV
    Overcharge Detection Delay Time 1024 ms
    Overdischarge Detection Voltage 2.1 V to 3.2 V (0.005 V Step)
    Overdischarge Detection Voltage Accuracy ±35 mV
    Overdischarge Detection Delay Time 32 ms, 64 ms, 128 ms
    Discharge Overcurrent Detection Voltage VDET3-1: 0.005 V to 0.050 V (0.0005 V Step)
    VDET3-2: 0.011 V to 0.100 V (0.0005 V Step)
    Discharge Overcurrent Detection Voltage Accuracy VDET3-1: ±1.0 mV (VDET3-1 ≤ 0.0300 V), ±1.5 mV (VDET3-1 ≥ 0.0305 V)
    VDET3-2: ±2.0 mV (VDET3-2 ≤ 0.0600 V), ±4.0% (VDET3-2 ≥ 0.0605 V)
    Discharge Overcurrent Detection Delay Time VDET3-1-typeA: 1024 ms, 2048 ms, 3072 ms, 4096 ms,
    VDET3-1-typeB: 12.5 ms, 16.5 ms, 1024 ms, 4096 ms
    VDET3-2: 7.5 ms, 12.5 ms, 16.5 ms
    Charge Overcurrent Detection Voltage -0.050 V to -0.005 V (0.0005 V Step)
    Charge Overcurrent Detection Voltage Accuracy ±1.5 mV (VDET4 ≤ -0.0305 V), ±1.0 mV (VDET4 ≥ -0.0300 V)
    Charge Overcurrent Detection Delay Time 10 ms, 17 ms
    Short Detection Voltage 0.030 V to 0.200 V (0.001 V Step)
    Short Detection Voltage Accuracy ±4.0 mV (VSHORT1 ≤ 0.120 V), ±5.0 mV (VDET4 ≥ 0.121 V)
    Short Detection Delay Time 280 µs
    Conditions for Overcharge Restoration Selectable: Auto Release / Latch
    Conditions for Overdischarge Restoration Selectable: Auto Release / Latch
    Package WLCSP-8-P10
    0 V Battery Charging Selectable: Permission / Inhibition

    Protections / Functions

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

      Typical Application

  • Quality &
    • 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.

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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".

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Category:Lithium-ion Battery Protection ICs

Features Battery Protection
Cell 1
Functions Short-circuit Current Detection