MB3887 Fujitsu, MB3887 Datasheet - Page 5

• Manufacturer Part Number: MB3887
• Description: DC/DC Converter IC
• Manufacturer: Fujitsu

BLOCK DIAGRAM
OUTC1
OUTC2
+INC1
−INC1
+INC2
−INC2
OUTD
−INE1
+INE1
−INE2
+INE2
−INE3
FB1
FB2
FB3
CS
10
13
12
24
16
11
15
22
7
8
9
4
2
1
3
5
<Current Amp1>
<Current Amp2>
<SOFT>
VREF
× 20
× 20
+
−
+
−
10
µA
4.2 V
<Error Amp1>
<Error Amp2>
<Error Amp3>
−
+
−
+
−
+
+
45 pF
VREF
VREF
VREF
<OSC>
RT
17
<PWM Comp.>
+
+
+
−
bias
<UVLO>
Voltage
(VCC UVLO)
<VH>
VCC
Bias
4.2 V
<REF>
VREF
6
2.5 V
1.5 V
UVLO
VREF
(0.77 V)
<OUT>
VREF
5.0 V
0.91 V
−
+
(V
215 kΩ
<CTL>
GND
VCC
CC
35 kΩ
Drive
23
− 6 V)
VCC
21
20
19
18
14
VCC (O)
OUT
VH
VCC
CTL
MB3887
5