MB3889 Fujitsu Microelectronics, Inc., MB3889 Datasheet - Page 4

• Manufacturer Part Number: MB3889
• Description: 2-channel Dc/dc Converter Ic With Overcurrent Protection Symmetrical-phase Type
• Manufacturer: Fujitsu Microelectronics, Inc.

4
MB3889
Pin No.
PIN DESCRIPTION
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
1
2
3
4
5
6
7
8
9
PWRGOOD
Symbol
OUT1-2
OUT2-2
OUT2-1
OUT1-1
PGND2
PGND1
SGND
CSCP
VREF
CTL1
CTL2
ILIM2
ILIM1
VCC
CS1
N.C.
CS2
CB2
N.C.
CB1
FB1
CTL
FB2
VS2
VS1
INE1
INE2
RT
VB
I/O
O
O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
CH1 error amp inverted input terminal
CH1 error amp output terminal
CH1 soft-start capacitor connection terminal
No connection
Triangular waveform oscillation frequency setting resistor connection termi-
nal
Power supply control terminal.
“H” level : IC operating mode
Ground terminal
Reference voltage output terminal
CH1 control terminal
“H” level : CH1 ON state
“L” level : CH1 OFF state and protection status reset
CH2 control terminal
“H” level : CH2 ON state
“L” level : CH2 OFF state and protection status reset
Timer-latch short-circuit protection capacitor connection terminal
CH1, CH2 protection status output terminal
CH2 soft-start capacitor connection terminal
CH2 error amp output terminal
CH2 error amp inverted input terminal
CH2 boot capacitor connection terminal
Connect a capacitor between the CB2 and VS2 terminals.
CH2 totem-pole output terminal (External main-side FET gate drive)
CH2 external main-side FET source connection terminal
CH2 totem-pole output terminal (External synchronous-rectification-side FET
gate drive)
Ground terminal
No connection
Output circuit bias output terminal
CH2 overcurrent detection resistor connection terminal
Reference voltage, control circuit power supply terminal
CH1 overcurrent detection resistor connection terminal
Ground terminal
CH1 totem-pole output terminal (External synchronous-rectification-side FET
gate drive)
CH1 external main-side FET source connection terminal
CH1 totem-pole output terminal (External main-side FET gate drive)
CH1 boot capacitor connection terminal
Connect a capacitor between the CB1 and VS1 terminals.
“L” level : IC Standby mode
Descriptions