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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 have a high detection accuracy. Especially R5470K/R5471K Series have an ultra high accuracy over-charge detection of ±10mV in a temperatutre range from 0℃ to 50℃. R5480K Series have an ultra high accuracy excess discharge current detection of ±15% (±4.5mV to 7.2mV).

		Over-charge
Product Name		R5400N	R5402N	R5403x R5405x	R5470K R5471K	R5475N R5478N	R5472x	R5480K
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	←
Detector Threshold Range (Accuracy)		4.0V to 4.5V (±25mV)	←	←	4.1V to 4.5V^*1 (±10mV)	4.2V to 4.5V, 3.65V, 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%)
Output Delay Time	Typ.	12ms	6ms or 12ms	6ms or 12ms or 16ms	12ms	6ms or 12ms	12ms	←
		Excess charge current
Detector Threshold Range (Accuracy)		-	-0.1V (±30mV)	-0.2V to -0.05V (±30mV)	-0.15V to -0.05V (±20mV)	-	-0.100V to -0.081V (±15mV) -0.080V to -0.050V (±10mV)	-0.030V to -0.020V (±15%)
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
Output Delay Time	Typ.	300µs	200µs or 300µs	200µs or 300µs or 400µs	250µs	200µs or 300µs	250µs	←
Product Name		R5400N	R5402N	R5403x R5405x	R5470K R5471K	R5475N R5478N	R5472x	R5480K
0V charge		Acceptable	←	←	Prohibited	Selectable	Prohibited	←
Remarks					High precision ±10mV		Excess current sensing by external resistor with RSENS pin.
Package		SOT-23-5	SOT-23-6	R5403x DFN(PLP)1820-6 SOT-23-5	R5470K DFN(PLP)2114-4B	R5475N SOT-23-5	DFN(PLP)1414-6 DFN1414-6	DFN(PLP)1414-6
Package		SOT-23-5	SOT-23-6	R5405x DFN(PLP)1616-6 DFN1814-6 SOT-23-6	R5471K DFN(PLP)1616-6B	R5478N SOT-23-6	DFN(PLP)1414-6 DFN1414-6	DFN(PLP)1414-6
Flyer/Data Sheet							-	-
Code List				R5403x	R5470K	-	-	-
Code List				R5405x	R5471K	-	-	-

*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.

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TYPICAL APPLICATION

R_SENS: Over-current detector input pin
Improved current sense accuracy is possible regardless of the MOSFET On-Resistance, even if considering the temperature characteristics by external resistor R3. (Excess current threshold of R5480K is ±15% (±4.5mV) at detector threshold 0.030V)