RN5VM111C datasheet(23/25 Pages) RICOH

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RN5VM1

××C/D

TYPICAL APPLICATION

–

RN5VM1

×××

Ω

100

Ω

0.1µF

VDD

V-

DOUT

COUT

Vss

0.1µF

0.01µF

NOTE ON EXTERNAL COMPONENTS

•R1 and C1 will stabilize a supply voltage to the RN5VM. A recommended R1 value is less than 1k

Ω.

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 1k

Ω.

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 1k

Ω.

•The time constants R1

×C1 or R2×C2 must have a relations as below:

×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.

RN5VM111C Fiches technique(PDF) 23 Page - RICOH electronics devices division