MB3885 Datasheet, PDF (3/29 Pages) Fujitsu Component Limited. – 1-channel DC/DC Converter IC with Synchronous Rectifier

MB3885
s PIN DESCRIPTIONS
Pin No. Symbol
I/O
1
N.C.

2
N.C.

3
CSCP

4
CT

5
RT

6
CS

7
FB
O
8
−INE
I
9
+INC
I
10
VCC

11
VB
O
12
CB

13
OUT1
O
14
VS

15
OUT2
O
16
PGND

17
SGND

18
VREF
O
19
N.C.

20
N.C.

Description
No connection
No connection
Timer latch short protection capacitor connection terminal
Triangular wave oscillator frequency setting capacitor connection terminal
Triangular wave oscillator frequency setting resistor connection terminal
Soft start capacitor connection terminal (Also used as output control)
Error Amp. output terminal
Error Amp. inverted input terminal
Overvoltage comparator non-inverted input terminal
Reference voltage, control circuit power supply terminal
Output circuit bias output terminal
Output bootstrap terminal
Insert a capacitor between the CB and VS terminals, to bootstrap the IC in-
ternal output transistor.
Totem pole output terminal (External main side FET gate drive)
External main side FET source connection terminal
Totem pole output terminal. (External synchronous rectifier side FET gate
drive)
Ground terminal
Ground terminal
Reference voltage output terminal
No connection
No connection
3