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MM1333J

Control for Lithium Ion Battery Charging (one cell)

Mitsumi 

MITSUMI

Application circuits

Control for Lithium Ion Battery Charging (one cell) MM1333

1. A diode is required to prevent reverse current from the battery.

2. Even higher precision can be obtained by inserting R2 for output voltage adjustment.

CEL intake current is used to adjust output voltage with R2. CEL intake current is around 3 ~ 10µA.

3. Charging current can be set with R3+R4.

Example : To set to 0.25A VCL/(R3+R4) = 0.1V/0.4Ω = 0.25A

4. Full charge detection current can be adjusted by the ratio between R3 and R4.

Example : H rank VIC/(VLC R4/(R3 + R4) = 0.031V/(0.1 0.21Ω/(0.19Ω + 0.21Ω)) = 0.59

This makes the ratio between charging current and full charge detection current 1 : 0.59.

Charging current was set at 0.25A in step 3 above, so full charge detection current is 0.25A 0.59 = 0.148A.

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