Li-ion/polymer Battery Protection ICs

Ricoh's Li-ion/polymer battery protection ICs have been released to the market since 1995, when the Li-ion rechargeable batteries became available. Ricoh has nearly 20 years of experience developing these products. These protection ICs protect batteries provide features like over-charge/discharge voltage, excess charge/discharge current and short circuit.
Ricoh has a wide product portfolio of 1cell protection ICs for smartphones and tablets, 2cell protection ICs for DSLR and portable DVD players, multi cell protection ICs for electrical power tools and E-bike and 2nd protection ICs for notebook PCs and electrical power tools.

1cell Li-ion/polymer Battery Protection IC Products Lineup

Ricoh's 1cell Li-ion/polymer battery protection ICs are high precision devices. Not only the over-charge detector threshold, for example, the R5486K Series have an ultra high accuracy excess discharge current detector of ±8% accuracy. (If VD3 is less than 38mV, ±3.1mV accuracy is guaranteed.) Due to using external sensing resistance solution, R5472x/R5480K/R5486K Series can detect more precise excess charge/discharge current than conventional solution of using FET's on resistance. FET's on resistance is unstable depending on the condition such as gate voltage, temperature, and FET part number. Besides, the R5471L Series have high precision over-charge voltage detector with ±10mV accuracy in the temperature range from 0°C to 50°C.

Product Name R5400N R5402N R5403x
R5405x
R5471L R5475N
R5478N
R5472x R5480K R5486K
Supply Current Typ. 3.5µA or 4.0µA 4.0µA 3.0µA 4.0µA
Standby Current Max. 0.1µA 0.1µA or 2.0µA 0.1µA 0.1µA or 2.0µA 0.1µA
  Over-charge
Detector Threshold Range
(Accuracy)
4.0V to 4.5V
(±25mV)
4.1V to 4.5V*1
(±10mV)
4.2V to 4.5V,
3.65V or 3.9V
(±25mV)
4.1V to 4.5V
(±20mV)
Output Delay Time Typ. 275ms or 1.1s 250ms or 1.0s 1.0s
Protection Latch Latch
or Auto release
Latch Latch
or Auto release
Latch
  Over-discharge
Detector Threshold Range
(Accuracy)
2.0V to 3.0V
(±2.5%) 
1.9V to 3.0V
(±2.5%)
2.1V to 3.0V
(±35mV)
Output Delay Time Typ. 20ms
Protection Latch Latch
or Auto release
Latch Latch
or Auto release
Latch
  Excess discharge current
Detector Threshold Range
(Accuracy)
0.05V to 0.20V
(±15mV)
0.05V to 0.13V
(±10mV)
 0.05V to 0.20V
(±15mV)
0.050V to 0.080V
(±10mV)
0.081V to 0.100V
(±15mV)
0.030V to 0.048V
(±15%)
VD3-1: 0.015V to 0.046V
(±8% or ±3.1mV)
VD3-2: 0.030V to 0.080V
(±8% or ±3.1mV)
Output Delay Time Typ. 12ms 6ms or 12ms 6ms or 12ms or 16ms 36ms 6ms or 12ms 12ms tVD3-1: 3s or 4s or 5s
tVD3-2: 12ms
  Excess charge current
Detector Threshold Range
(Accuracy)
 —   -0.1V
(±30mV)
-0.2V to -0.05V
(±30mV)
-0.17V to -0.05V
(±20mV)
 —   -0.100V to -0.081V
(±15mV)
-0.080V to -0.050V
(±10mV)
-0.030V to -0.020V
(±15%)
-0.060V to -0.015V
(±15% or ±3mV)
Output Delay Time Typ.  —   8ms or 16ms 8ms or 16ms 16ms  —   16ms
  Short Protection
Detector Threshold Typ. 1.3V 0.8V 0.8V 0.6V 0.75V 0.5V 0.18V or 0.5V 0.15V to 0.3V
Output Delay Time Typ. 300µs 200µs or 300µs 200µs or 300µs or 400µs 600µs 200µs or 300µs 250µs
Product Name R5400N R5402N R5403x
R5405x
R5471L R5475N
R5478N
R5472x R5480K R5486K
0V charge Selectable Prohibited
Remarks       High precision ±10mV   Excess current sensing by external resistor with RSENS pin. Excess current sensing by external resistor with RSENS pin.

Two steps of detection of VD3 detects an Excess discharge current more surely.
Package SOT-23-5 SOT-23-6 R5403x
DFN(PLP)1820-6
SOT-23-5
DFN1814-6 R5475N
SOT-23-5
DFN(PLP)1414-6
DFN1414-6
DFN(PLP)1414-6 DFN(PLP)1414-6
R5405x
DFN(PLP)1616-6
DFN1814-6
SOT-23-6
R5478N
SOT-23-6
Flyer/Data Sheet Download Download Download - Download Download Download Download
Code List Excel Excel R5403x Excel - - - - -
R5405x Excel
  • *1Topt=0°C to 50°C, Considering of variation in parameters.
    We compensate for these characteristics related to temperature by laser-trimming, however, this specifications is guaranteed by design.
  • *All PDF & Excel files are less than 1MB unless otherwise stated.
  • *If you don't have Adobe Reader, you can download free.
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TYPICAL APPLICATION

TYPICAL APPLICATION

RSENS: Over-current detector input pin
Due to using external resistance R3, R5472K/R5480K/R5486K Series can detect more precise excess charge/discharge current than conventional solution of using FET's on resistance. FET's on resistance is unstable depending on the condition such as gate voltage, temperature, and FET part number.
(Excess current threshold of R5486K is ±8% accuracy. If VD3 is less than 38mV, ±3.1mV accuracy is guaranteed.)

  • *)Products built-in the RSENS pin: R5472K, R5480K, R5486K

*

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    Selection guide is available for download in PDF format.

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