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MM1357 Datasheet(PDF) 5 Page - Mitsumi Electronics, Corp.

Part No. MM1357
Description  Control of Lithium Ion Batteries Monolithic IC
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Maker  MITSUMI [Mitsumi Electronics, Corp.]
Homepage  https://www.mitsumi.co.jp/index_e.html
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MM1357 Datasheet(HTML) 5 Page - Mitsumi Electronics, Corp.

   
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MITSUMI
Control of Lithium Ion Batteries (switching regulator secondary) (two cells) MM1357
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.
Application Circuits
Characteristics
Current limit 1 vs temperature
0.35
0.3
0.25
-25
0
25
50
75 85
Ambient temperature (
°C)
Current limit 2 vs temperature
0.2
0.15
0.1
-25
0
25
50
75 85
Ambient temperature (
°C)


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