The R5460xxxxxx Series are high voltage CMOS-based protection ICs for over-charge/discharge
of rechargeable two-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 six 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.
To release over-discharge detector, after detecting over-discharge voltage, connect a charger to the battery
pack, and when the battery supply voltage becomes higher than over-discharge detector threshold. In case of "A" version,
when the cell voltage becomes equal or more than the released voltage from over-discharge, over-discharge detector
is released.
Even if a battery is discharged to 0V, charge current is acceptable.
After detecting excess-discharge current
or short current, when the load is disconnected, the excess discharged or short condition is released and DOUT
becomes “H”.
After detecting over-discharge voltage, supply current will be kept extremely low by halting internal circuits'
operation.
When the output of COUT is “H”, if V- pin level is set at -1.6V, the delay time of detector can
be shortened. Especially, the delay time of the over-charge detector can be reduced into approximately 1/60
and test time for protection circuit PCB can be reduced. The output type of COUT and DOUT is CMOS. |
Manufactured
with High Voltage Tolerant 
R5460xxxxxx
Series
