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1-Cell Li-ion Battery Protection ICs

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.

TYPICAL APPLICATION

TYPICAL APPLICATION

RSENS:Over-current detector input pin
Due to using external resistance R3, R5480/R5486/R5494 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 R5499 is ±5% accuracy.

*) Products built-in the RSENS pin: R5480, R5486, R5499