MM1357 查看數據表（PDF） - Mitsumi

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MM1357

Control of Lithium Ion Batteries (switching regulator secondary) (two cells)

Mitsumi 

MITSUMI

Control of Lithium Ion Batteries (switching regulator secondary) (two cells) MM1357

Application Circuits

Note 1 : 1. The REG OUT voltage can be set to 1.2V typ. (R5+R6)/R6. (REG OUT = 2 to 6V)

2. The value of R4 should be set according to the load. (Consider it to be a shunt regulator.)

3. The voltage under constant-voltage charging is equal to (R3/R2) REG OUT. When a high-

precision voltage is required, use the knob for adjustment.

4. The current in constant-current charging can be set to either of two values, 0.15V/R1 (when CC-IN

is H), and 0.32V/R1 (when CC-IN is L).

5. R7 is a resistance for current limiting.

6. The capacitors C1 and C5 are to prevent oscillation; C4 is for soft starting of the REG OUT

voltage; and C2 is used to delay current switching (CC-OUT switched from H to L).

Note 2 : This IC incorporates a voltage-controlling amp and protection against shorting to VREF ; when R2,

R3, R5 and R6 are shorted, the voltage is limited to its minimum value. By means of a comparator

within the VFB+, VFB- and VREF pin area, upon resistance shorting the OUT pin is forced to L.

Note 3 : The above diagram is an example for reference purposes; in actual use the circuit should be studied

thoroughly prior to use.

Characteristics

Current limit 1 vs temperature

0.35

Current limit 2 vs temperature

0.2

0.3

0.25

-25

0

25

50

75 85

Ambient temperature (°C)

0.15

0.1

-25

0

25

50

75 85

Ambient temperature (°C)

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