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R5439 Series

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

  • PLP
  • RoHS

The R5439 is an overcharge protection IC for 2 to 4 serial cell Li-ion or Li-polymer secondary battery. Internally, the R5439 consists of high-accuracy voltage detection circuit, a delay circuit, and a voltage regulator for operating the external real-time clock. The two-stage shut-down detection circuit can reduce the supply current to the minimum.

Specs & Datasheets

Operating Input Voltage 4.0 V to 25 V or VC1 +5 V (Maximum Rating: 32 V)
Number of Cells 2,3,4
Supply Current Typ. 4.0 µA (VCELLn = 4.15V)
Typ. 2.5 µA (VCELLn = 3.1V)
Standby Current Typ. 0.2 µA
Shutdown Detection Voltage VSHT1: 3.8 V ±0.3 V
VSHT2: 2.3 V to 2.8 V ±0.05 V (0.1V Steps)
Overcharge Detection Voltage 4.20 V to 4.60 V (0.005 V Steps)
Overcharge Detection Voltage Accuracy ±20 mV
Overcharge Detection Delay Time 1.5 s, 2 s, 4 s, 6 s
With Delay Time Shortening, the time can be reduced to approx. 1/80
Overcharge Restoration Voltage VDET1 to VDET1−0.4 V (0.05 V Steps)
Min. 4.15 V
Package DFN(PLP)2020-8
Built-in Regulator Output Voltage 2.9 V to 3.7 V (0.1 V Steps)
Built-in Regulator Output Accuracy ±2.0%

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: 4-cell Protection Circuit (CMOS Output, Active-high)

Note: Connect the pins in the following order: B-, B3, B2, B1, and B+.
RVDD: 100 Ω, R1~4: 1000 Ω, CVDD,C1~4,CVROUT: 0.1 µF

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
  • plpP
DFN(PLP)2020-8 R5439K R5439K

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Please contact us or our distributors for unpublished reliability information.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 2,3,4
Functions Delay Time Shortening
PLP Applicable