MB39A125 Datasheet, PDF (9/64 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion Battery

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