SC1408 Semtech Corporation, SC1408 Datasheet - Page 5

• Manufacturer Part Number: SC1408
• Description: LOW VOLTAGE/ BOOST DC-DC CONTROLLER
• Manufacturer: Semtech Corporation

August 22, 2000
Fig. 1: Typical Application - Boost Configuration
Fig. 2: Typical Application - Buck/Boost (SEPIC) Configuration
© 2000 SEMTECH CORP.
Vin=2.7V to 6V
C2
100uF
C2
100uF
Vin=3.3V
+
+
C4
0.1uF
C5
0.1uF
C5
0.1uF
2
4
5
7
COILCRAFT DO3316P-223
2
4
5
7
L1A/L1B IS COUPLED INDUCTOR
PULSE PE-53718 OR
EQUIVALENT
SC1408IS
U1
BST
SHDN
REF
GND
2
L1
SC1408IS
U1
BST
SHDN
REF
GND
L1A 22uH
22uH
D2 1N4148
ISENSE
ISENSE
AGND
GATE
AGND
GATE
LOW VOLTAGE, BOOST DC-DC
CONTROLLER
1
FB
FB
1
8
3
6
1
8
3
6
Q1
IRLR024N
R2
0.05Ohm
Q1
IRLL3303
D1
B130T
(1) See Component Selection
C1
R2
0.05Ohm
652 MITCHELL ROAD NEWBURY PARK CA 91320
+
100uF
31.6k
4
3
R3
(1) See Component Selection
L1B
22uH
D1
B130T
R4
10.0k
31.6k
R3
C9
(1)
R4
10.0k
+
C3
100uF
C9
(1)
Vout=5V
+
+
C3
100uF
Vout=5V
C8
100uF
SC1408
+
C8
100uF
5