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R5431V Series



Data Sheet

The R5431Vxxxxx Series are high voltage CMOS-based protection ICs for over-charge/discharge of rechargeable three-cell/four-cell Lithium-ion (Li+) / Lithium polymer, further include a short circuit protection circuit for preventing large external short circuit current and the protection circuits against the excess discharge-current and excess charge current.

Each of these ICs is composed of eleven voltage detectors, a reference unit, a delay circuit, a short circuit protector, an oscillator, a counter, and a logic circuit. When the over-charge voltage threshold or excess-charge current threshold crosses the each detector threshold from a low value to a high value, the output of COUT pin switches to “L” level after internal fixed delay time. To release over-charge detector after detecting over-charge, the detector can be reset and the output of COUT becomes "H" when a kind of load is connected to VDD after a charger is disconnected from the battery pack and the cell voltage becomes lower than over-charge detector threshold. In case that a charger is continuously connected to the battery pack, if the cell voltage becomes lower than the over-charge detector threshold, over-charge state is also released.

The output of DOUT pin, the output of the over-discharge detector and the excess discharge-current detector, switches to “L” level after internally fixed delay time, when discharged voltage crosses the detector threshold from a high value to a value lower than VDET2.

After detecting over-discharge voltage, when the cell voltage becomes higher than the released voltage from over-discharge, over-discharge state is released and the output of DOUT becomes “L”.

By setting DS pin voltage as same as the VDD, the testing time of protection circuit board can be shortened. The delay time of the over-charge detector, over-discharge detector, and excess current detector can be reduced into approximately 1/50. The output type of COUT and DOUT is CMOS.


Manufactured with High Voltage Tolerant Process Absolute Maximum Rating 30V
Low supply current Supply current (At normal mode) Typ. 12.0µA
Standby current Typ. 6.0µA
High accuracy detector threshold Over-charge detector (Ta=25°C) ±25mV
Over-discharge detector ±2.5%
Excess discharge-current detector ±20mV
Excess charge-current detector ±30mV
Variety of detector threshold Over-charge detector threshold 3.6V-4.5V step of 0.005V (VDET1n) (n=1,2,3,4)
Over-discharge detector threshold 2.0V-3.0V step of 0.005V (VDET2n) (n=1,2,3,4)
Excess discharge-current threshold1 VDD-0.20V (Fixed)
Excess discharge-current threshold2 VDD-0.6V (Fixed)
Short detector threshold VDD-1.2V (Fixed)
Excess charge-current threshold VDD+0.2V (Fixed)
Over-charge released voltage VDET1n-0.1V to 0.4V step of 0.05V (VREL1n) (n=1,2,3,4)
Over-discharge released voltage VDET2n+(0.2V to 0.7V, step of 0.1V) (VREL2n) (n=1,2,3,4)
Internal fixed Output delay time Over-charge detector Output Delay 1.0s
Over-discharge detector Output Delay 1.2s/128ms
Excess discharge-current detector Output Delay1 1.0s/12ms
Excess discharge-current detector Output Delay2 10ms/2ms
Excess charge-current detector Output Delay 8ms
Short Circuit detector Output Delay 300µs
Output Delay Time Shortening Function By forcing VDD voltage level to DS pin, the Output Delay time of detect and release the over-charge/discharge, the excess-charge/discharge current can be reduced.
If DS pin is not necessary, set the level to VSS. Especially, the Delay Time for over-charge/discharge, excess discharge current output delay 1 become about 1/50 of normal state.)
0V-battery charge For each cell, charge inhibit voltage is set at Max.=1.1V. (Vnochgn, n=1,2,3,4)
Small package SSOP-16

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  • Li+ / Li Polymer protector of over-charge, over-discharge, excess-current for battery pack
  • Over-charge, discharge, and current protectors for notebook-PCs, power tools, and any other gadgets using on board Li+ / Li Polymer battery

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DataSheet Package Info. Quality Assurance Data
R5431V Series SSOP-16 Reliability

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