MB3887 Datasheet, PDF (5/33 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion battery

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