August 25, 1998
12V
5V
+
R1
10
0.1uF
U1
5
VCC
CS+
CS-
VO SENSE
PWRGOOD
VID4
OVP
VID0
VID1
VID2
+
R16
10k
C13
1.00k
2.32k
R6
R5
© 1998 SEMTECH CORP.
APPLICATION CIRCUIT
C1
0.1uF
C2
1500uF
C3
1500uF
9
8
17
7
18
4uH
15
11
10
13
14
23
3
* R13
C14
1500uF
C16
1500uF
Q2
BUK556
L1
R4
5mOhm
C15
1500uF
C17
1500uF
Q1
BUK556
6
22
21
20
19
VID3
EN
AGND
PGNDL
GATE2
GATE1
LDOS2
LDOS1
LDOV
BSTL
DL
PGNDH
DH
BSTH
VCC_CORE
EN
16
C5
0.1uF
12
24
2
4
1
+
+
+
+
C18
0.1uF
GND
OVP
VID0
VID1
VID2
VID3
VID4
SC1182/3CSW
R12
*
VLIN1
Q3
BUK556
PWRGD
+
+
* R15
R17
100K
C11
330uF
C12
330uF
VLIN2
5V
5V
+
R14
*
+
C22
Q4
BUK556
C9
330uF
+
+
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
C21
330uF
C10
330uF
NOTE: FOR SC1182, R12,R13,R14 AND R15 ARE NOT REQUIRED.
CONNECT LDOS1 (PIN3) AND LDOS2 (PIN4)
TO VLIN1 AND VLIN2 RESPECTIVELY TO
DIRECTLY GENERATE 2.5V AND 1.5V OUTPUTS.
* SEE "SETTING LDO OUTPUT VOLTAGE" TABLE
R18
100K
330uF
SC1182/3
5
652 MITCHELL ROAD NEWBURY PARK CA 91320
SEMTECH [ SEMTECH CORPORATION ]
