R5421NXXXC View Datasheet(PDF) - RICOH Co.,Ltd.

Part Name

Description

MFG CO.

R5421NXXXC

Li-Ion BATTERY PROTECTOR

RICOH Co.,Ltd. 

s TYPICAL APPLICATION

R1

100Ω

C1

0.1µF

5

4

C3

0.01µF 6

R5421NxxxC 2

1

3

C2

0.1µF

R2

1kΩ

s APPLICATION HINTS

R1 and C1 will stabilize a supply voltage to the R5421NxxxC. 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

R5421NxxxC.

R2 and C2 will stabilize a V- pin voltage. The resetting from over-discharge with connecting a charger possibly be disabled by

larger value of R2. Recommended value is less than 1 kΩ.

After an over-charge detection even connecting battery pack to a system probably could not allow a system to draw load

current by a larger R2C2 time constant in the C version.

Recommended C2 value is less than 1µF.

R1 and R2 can operate also as a part of current limit circuit against for setting cell reverse direction or for applying excess

charging voltage to the R5421NxxxC, battery pack, while smaller

R1 and R2 may cause a power consumption over rating of power dissipation of the R5421NxxxC and a total of 'R1+R2' should

be more than 1kΩ.

The time constants R1C1 or R2C2 must have a relations as below:

R1C1≤R2C2

Because in case that R1C1, time constant for VDD pin ,would be larger than R2C2, time constant for V- pin, then the

R5421NxxxC might be into a standby mode after detecting excess current or short circuit current.

Rev.1.11

- 17 -

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