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

Pin Description

Pin no. Pin name Input/output

Function

1

OUT

Output

Output pin for charging control

An external photocoupler is controlled for constant-current, constant-voltage charging control.

Amp inverting input pin for current control

2

CFB

Input An external capacitor (approx. 0.1 µF) is connected between CFB and OUT, and

phase compensation used to improve oscillation.

Current detection pin

3

CSR

Input Current is detected via the voltage drop across an external resistance between

CSR and GND (R1), to control the charging current.

Charging current switching signal input pin

H (VCC) is the charging current 0.15V/R1, and L (GND) is the charging current

0.32V/R1. If for instance R1 is 0.1Ω, then switching is between 1.5A and 3.2A (typ.).

4

CC IN

Input The switching voltage VTH is as follows.

When REG OUT is 2.5V, VTH is 2.05V typ.

When REG OUT is 4V, VTH is 3.0V typ.

When REG OUT is 5V, VTH is 3.7V typ.

Amp non-inverting input pin 1 for current control

The pin voltage is set at 0.15V typ. With CC-IN at H or open, the non-inverting input

5

ADJ1

Input pin of the current control amp is at 0.15 V.

By adjusting the pin voltage using an external resistance or by other means, the

charging current can be varied.

6 P-GND Input Power ground pin

Amp non-inverting input pin 2 for current control

The pin voltage is set at 0.32V typ. With CC-IN at L, the non-inverting input pin of the

7

ADJ2

Input current control amp is at 0.32V.

By adjusting the pin voltage using an external resistance or by other means, the

charging current can be varied.

Charging current switching signal output pin

Output is in phase with CC IN. By connecting an external capacitor between CC OUT

8 CC OUT Output and REG OUT, a delay can be added only when the current switching CC IN goes

from H to L. For instance, when REG OUT is 4V, on connecting an 0.1µF capacitor

CC OUT becomes about 50mS (an example is shown in the Timing Chart section).

9 S-GND Input Signal ground pin

10 VFB+

Input

Amp non-inverting input pin for voltage control

The charging voltage is set through the resistances at the VFB + pin and the VFB - pin.

11

VCC

Input Power supply input pin

Reference voltage circuit output pin

12 REG OUT Output The reference voltage can be set between 2 and 6V. The input current to start the

reference voltage should be set to 1mA or greater.

Reference voltage circuit input pin

13 VREF

Input

The VREF pin voltage is set at 1.2V typ. The REG OUT voltage can be set through the

resistances between REG OUT and VREF, and between VREF and GND.

Amp inverter input pin for voltage control

Amp inverting input pin for voltage control

14 VFB-

Input

The charging voltage can be set through the resistances at the VFB + pin and VFB - pin.

By connecting an external capacitor (approx. 0.1µF) between VFB and OUT for phase

compensation, oscillation can be improved.

Absolute Maximun Ratings

Item

Storage temperature

Operating temperature

Power supply voltage

Allowable loss

Symbol

TSTG

TOPR

VCC max.

PD

Ratings

-40~+125

-20~+85

-0.3~+24

350

Units

°C

°C

V

mW

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