The R5431 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.
|Operating Input Voltage Range||2.0 V to 20 V (Absolute Maximum Rating: 26 V)|
|Charger Positive Input Voltage (V+)||30 V (Absolute Maximum Rating)|
|Supply Current||Typ. 12.0 µA|
|Standby Current||Typ. 6.0 µA|
|Detector Threshold Range||3.6 V to 4.5 V (0.005 V Steps)|
|Voltage Accuracy||±25 mV|
|Output Delay Time||1.0 s|
|Detector Threshold Range||2.0 V to 3.0 V (0.005 V Steps)|
|Output Delay Time||1.2 s, 128 ms|
|Detector Threshold Range||VDET3-1: VDD-0.20V
|Voltage Accuracy||±20 mV|
|Output Delay Time||VDET3-1: 1.0 s / 12 ms
VDET3-2: 10 ms / 2 ms
|Voltage Accuracy||±30 mV|
|Output Delay Time||8 ms|
|Short Protection||Detector Threshold||VDD-1.2V|
|Output Delay Time||300 µs|
|0V-battery charge||Unacceptable: For each cell, charge inhibit voltage is set at Max.=1.1V. (Vnochgn, n=1,2,3,4)|
In the R5431 Series, input threshold of over-charge, over-discharge, excess charge/discharge current, and output delay time can be designated according to the application.
|Product Name||Package||Quantity per Reel|
output delay time 1
output delay time 2