Li-lon BATTERY PROTECTOR
RN5VM1××C/D SERIES
OUTLINE
The RN5VM Series are protection ICs for over-charge/discharge of rechargeable one-cell Lithium-ion (Li+) batteries by
CMOS process.
The RN5VM Series can detect over-charge/discharge of Li+ one-cell and excess load current, further include a short cir-
cuit protector for preventing large external short circuit current.
Each of these ICs is composed of three voltage detectors, a reference unit, a hysteresis circuit, and a short circuit protec-
tor. When charging voltage crosses the detector threshold from a low value to a value higher than VDET1, the output of
COUT pin, the output of over-charge detector/VD1, switches to low level, ..charger’s negative pin level. After detecting over-
charge the VD1 can be reset and the output of COUT pin becomes “H” when the VDD voltage is coming down to a level low-
er than “VDET1 - VHYS1”, or when a charger is disconnected from the battery pack while the VDD level is in between “VDET1”
and “VDET1 - VHYS1” in the RN5VM1××C version.
While in the RN5VM1××D version after detecting over-charge, any load current can not be drawn from the battery pack
when the VDD voltage stays over “VDET1 - VHYS1”, excepting that the VD1 can be reset and it allows to draw load current
when the VDD voltage is coming down to a level lower than “VDET1 - VHYS1” because of a cell internal discharging.
The output of DOUT pin, the output of over-discharge detector/VD2, switches to “L” after internally fixed delay time passed,
when discharging voltage crosses the detector threshold from a high value to a value lower than VDET2. An excess load cur-
rent can be sensed and cut off after internally fixed delay time passed through the built in excess current detector, VD3,
with DOUT being enabled to low level. Once after detecting excess current, the VD3 is released and DOUT level switches
to “H” by detaching a battery pack from a load system.
Further, short circuit protector makes DOUT level to “L” immediately with external short circuit current and removing
external short circuit leads DOUT level to “H”. After detecting over-discharge, supply current will be kept extremely “L” by
halting some internal circuits operation. The output delay of over-charge detectors can be set by connecting external capac-
itors. Output type of COUT and DOUT are CMOS. SOT23-6 is available.
FEATURES
• Low supply current
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Supply current
TYP. 3.0µA
Standby current (after detecting over-discharge) TYP. 0.3µA
Absolute maximum ratings 28V (VDD–V-)
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• High withstand voltage
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• High accuracy detector threshold
Over-charge detector
50mV
Over-discharge detector
2.5%
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• Variety of detector threshold
Over-charge detector threshold
Over-discharge detector threshold
Excess current trip/Short circuit protector
Time delay at C3= 0.01µF and VDD=4.3V
SOT-23-6
4.0V to 4.4V/step of 0.01V
2.0V to 3.0V/step of 0.05V
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• Built-in protection circuit
• Output delay of over-charge
75ms for RN5VM111×
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• Ultra small package
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RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
