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MB39A125PFV

DC/DC Converter IC for Charging Li-ion Battery

Fujitsu 

MB39A125/126

• MB39A126 : SSOP-24

Pin No. Pin Name

1

−INC2

2

OUTC2

3

+INE2

4

−INE2

5

ACOK

6

VREF

7

ACIN

8

−INE1

9

+INE1

10

OUTC1

11

SEL

12

−INC1

13

+INC1

14

CTL

15

FB123

16

−INE3

17

RT

18

XACOK

19

VH

20

OUT

21

VCC

22

CS

23

GND

24

+INC2

I/O

Description

I Current detection amplifier (Current Amp2) inverted input terminal

O Current detection amplifier (Current Amp2) output terminal

I Error amplifier (Error Amp2) non-inverted input terminal

I Error amplifier (Error Amp2) inverted input terminal

AC adapter voltage detection block (AC Comp.) output terminal

O ACOK = L when ACIN = H, ACOK = Hi-Z when ACIN = L,

ACOK = Hi-Z when CTL = L

O Reference voltage output terminal

I AC adapter voltage detection block (AC Comp.) input terminal

I Error amplifier (Error Amp1) inverted input terminal

I Error amplifier (Error Amp1) non-inverted input terminal

O Current detection amplifier (Current Amp1) output terminal

Charge voltage setting switch terminal (3cells or 4cells)

I SEL terminal “H” level : Charge voltage setting 16.8 V (4cells)

SEL terminal “L” level : Charge voltage setting 12.6 V (3cells)

I Current detection amplifier (Current Amp1) inverted input terminal

I Current detection amplifier (Current Amp1) non-inverted input terminal

I

Power supply control terminal

Setting the CTL terminal at “L” level places the IC in the standby mode.

O Error amplifier (Error Amp1, 2, 3) output terminal

I Error amplifier (Error Amp3) inverted input terminal

⎯ Triangular wave oscillation frequency setting resistor connection terminal

AC adapter voltage detection block ( AC Comp.) output terminal

O XACOK = Hi-Z when ACIN = H, XACOK = L when ACIN = L,

XACOK = Hi-Z when CTL = L

O Power supply terminal for FET drive circuit (VH = VCC - 6 V)

O External FET gate drive terminal

⎯

Power supply terminal for reference voltage, control circuit, and output cir-

cuit

⎯ Soft-start setting capacitor connection terminal

⎯ Ground terminal

I Current detection amplifier (Current Amp2) non-inverted input terminal

9

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