RN5VM1××C/D
TYPICAL APPLICATION
+
R1
100Ω
C1
0.1µF
5
VDD
RN5VM1×××
2
6
Ct
V-
C3
0.01µF
DOUT
4
COUT
1
3 Vss
C2
0.1µF
R2
1kΩ
–
NOTE ON EXTERNAL COMPONENTS
•R1 and C1 will stabilize a supply voltage to the RN5VM. A recommended R1 value is less than 1kΩ.
A larger value of R1 leads higher detection voltage, makes some errors, because of shoot through current
flowed in the RN5VM.
•R2 and C2 will stabilize a V- pin voltage. The resetting from over-discharge with connecting charger possibly
be disabled by larger value of R2. Recommended value is less than 1kΩ.
After an over-charge detection, a system may not draw load current when a battery pack is connected to it in
the C version with R2 and C2 time constants at relatively larger settings.
Recommended C2 value is less than 1µF.
•R1 and R2 can operate as a current limiter against setting cell reverse direction or for applying excess
charging voltage to the 5VM. While smaller R1 and R2 may cause an over power dissipation rating of the
RN5VM and a total of “R1+R2” should be more than 1kΩ.
•The time constants R1×C1 or R2×C2 must have a relations as below:
R1×C1≤R2×C2
Because in case that R1×C1, time constant for VDD pin, would be larger than R2×C2, time constant for V- pin,
then the RN5VM might be into a standby mode after detecting excess current or short circuit current.
19
RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
