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R5437 Series

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

  • PLP
  • RoHS

The R5437 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.

Specs & Datasheets

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 4.65 V (0.005 V Steps)
Overcharge Detection Voltage Accuracy ±20 mV
Overcharge Detection Delay Time 2 s, 4 s, 6 s
with Delay Time Shortening Function, the delay time can be reduced down 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

Download Datasheet

Protections / Functions

Functional Description

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

Technical Documents

Typical Application: 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 & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
  • plpP
DFN1814-6C R5437L R5437L

Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.

Sample / Buy

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 "Externally Configurable Protections and Their Advantages".

Search for similar products under conditions below.

Category:Lithium-ion Battery Protection ICs

Features Second Protection
Cell 1,2,3
Functions Delay Time Shortening
PLP Applicable