MB39A125 Datasheet, PDF (7/64 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion Battery

MB39A125/126
■ PIN DESCRIPTIONS
• MB39A125 : SSOP-24
Pin No. Pin Name
I/O
1
−INC2
I
2
OUTC2
O
3
+INE2
I
4
−INE2
I
5
ACOK
O
6
VREF
O
7
ACIN
I
8
−INE1
I
9
+INE1
I
10
OUTC1
O
11
OUTD
O
12
−INC1
I
13
+INC1
I
14
CTL
I
15
FB123
O
16
−INE3
I
17
RT
⎯
18
XACOK
O
19
VH
O
20
OUT
O
21
VCC
⎯
22
CS
⎯
23
GND
⎯
24
+INC2
I
Description
Current detection amplifier (Current Amp2) inverted input terminal
Current detection amplifier (Current Amp2) output terminal
Error amplifier (Error Amp2) non-inverted input terminal
Error amplifier (Error Amp2) inverted input terminal
AC adapter voltage detection block (AC Comp.) output terminal
ACOK = L when ACIN = H, ACOK = Hi-Z when ACIN = L,
ACOK = Hi-Z when CTL = L
Reference voltage output terminal
AC adapter voltage detection block (AC Comp.) input terminal
Error amplifier (Error Amp1) inverted input terminal
Error amplifier (Error Amp1) non-inverted input terminal
Current detection amplifier (Current Amp1) output terminal
When IC is standby mode, this terminal is set to “Hi-Z” to prevent loss
of inefficient current through the output voltage setting resistor.
Set CTL terminal to “H” level to output “L” level.
Current detection amplifier (Current Amp1) inverted input terminal
Current detection amplifier (Current Amp1) non-inverted input terminal
Power supply control terminal
Setting the CTL terminal at “L” level places the IC in the standby
mode.
Error amplifier (Error Amp1, 2, 3) output terminal
Error amplifier (Error Amp3) inverted input terminal
Triangular wave oscillation frequency setting resistor connection terminal
AC adapter voltage detection block ( AC Comp.) output terminal
XACOK = Hi-Z when ACIN = H, XACOK = L when ACIN = L,
XACOK = Hi-Z when CTL = L
Power supply terminal for FET drive circuit (VH = VCC − 6 V)
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
Current detection amplifier (Current Amp2) non-inverted input terminal
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