MB39A125 Datasheet, PDF (8/64 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion Battery

MB39A125/126
• MB39A125 : QFN-28
Pin No. Pin Name
1
N.C.
2
GND
3
+INC2
4
N.C.
5
−INC2
6
OUTC2
7
+INE2
8
−INE2
9
ACOK
10
VREF
11
ACIN
12
−INE1
13
+INE1
14
OUTC1
15
N.C.
16
OUTD
17
−INC1
18
N.C.
19
+INC1
20
CTL
21
FB123
22
−INE3
23
RT
24
XACOK
25
VH
26
OUT
27
VCC
28
CS
I/O
Description
⎯ No connection
⎯ Ground terminal
I Current detection amplifier (Current Amp2) non-inverted input terminal
⎯ No connection
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
⎯ No connection
When IC is standby mode, this terminal is set to “Hi-Z” to prevent loss
O of inefficient current through the output voltage setting resistor.
Set CTL terminal to “H” level to output “L” level.
I Current detection amplifier (Current Amp1) inverted input terminal
⎯ No connection
I Current detection amplifier (Current Amp1) non-inverted input terminal
Power supply control terminal
I 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
8