R5438 Series
1-Cell to 3-Cell Li-ion Battery Second Protection IC

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  • Description

    The R5438 is an overcharge protection IC for 1 to 3 serial cells Li-ion / Li-polymer rechargeable battery. This device provides the high-accuracy voltage detection function and the shutdown function can reduce the supply current to the minimum when all cell’s voltage becomes less than the shutdown detection voltage.

  • Spec
    Operating Input Voltage 1.5 V to 20 V or VC1 +5 V (Maximum Rating: 26 V)
    Number of Cells 1,2,3
    Supply Current Typ. 0.85 µA
    Shutdown Detection Voltage 3.5 V ±0.3 V
    Shutdown Current Max. 0.1 µA
    Overcharge Detection Voltage 4.10 V to 4.70 V (0.005 V Steps)
    Overcharge Detection Voltage Accuracy ±20 mV
    Overcharge Detection Delay Time 1 s, 2 s, 4 s, 6 s
    With Delay Time Shortening, the delay time can be reduced to approx. 1/90
    Overcharge Restoration Voltage VDET1 to VDET1−0.5 V (0.05 V Steps)
    Conditions for Overcharge Restoration Voltage Release
    Package DFN1814-6C

    Protections / Functions

    Temperature Protection Reset Alarm Cell Balance Cascadable Open Wire Detection Wakeup Short-circuit Current Detection Delay Time Shortening
  • Technical
    • Typical Application: Normal Mode (CMOS Output, Active-high)

      Normal Mode (CMOS Output, Active-high)

      Note 1: As for the order of cell's connection, connect a positive terminal of CELL1 as the end terminal.
      Note 2: In Delay Shortening (DS) mode, applying a voltage of 4V between VDD and VC1 is required.
      RVDD: 100 Ω, R1 to R3: 1000 Ω, CVDD,C1 to C3: 0.1 µF

  • 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 1,2,3
Functions Delay Time Shortening
PLP Applicable