R5641 Series
2-Cell to 4-Cell Li-ion Battery Second Protection IC

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  • Description

    The R5641 is an overcharge protection IC for 2- to 4-series cell Li-ion / Li-polymer rechargeable battery pack, with built-in high-accuracy voltage detection circuits and delay circuits. Controlling the supply voltage to the CTLC pin can control the COUT pin output. The shutdown detection can reduce the supply current to the minimum.

    • Reducing the supply current to 0.2 µA or less after shutdown detection can achieve the longer battery life.
    • Temperature protection enabled with an external PTC thermistor.
    • Be adaptable to 30 V input voltage by using high-voltage process.

  • Spec
    Operating Input Voltage 4.0 V to 20 V (Maximum Rating: 30 V)
    Number of Cells 2,3,4
    Supply Current Typ. 2.8 µA
    Shutdown Detection Voltage Typ. 2.5 V ± 0.3 V, 3.7 V ± 0.3 V
    Shutdown Current Max. 0.2 µA
    Overcharge Detection Voltage 4.10 V to 4.60 V (0.005 V Steps)
    Overcharge Detection Voltage Accuracy ±0.016 V (Ta = 25°C)
    ±0.025 V (0°C ≤ Ta ≤ 60°C)
    Overcharge Detection Delay Time 2 s, 4 s, 6 s
    Overcharge Restoration Voltage VDET1 to VDET1 -0.4 V (0.05 V Steps)
    Min. 4.05 V (Shutdown detection voltage = 3.7 V)
    Package DFN2020-8C
    CTLC Detection Delay Time 2 ms
    Output Form CMOS Output

    Protections / Functions

    Temperature Protection Reset Alarm Cell Balance Cascadable Open Wire Detection Wakeup Short-circuit Current Detection Delay Time Shortening
  • Technical
    • Typical Application: 4-cell Protection Circuit

      Typical Application: 4-cell Protection Circuit

  • 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.

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".

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Category:Lithium-ion Battery Protection ICs

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