LT3580
19
3580fg
TYPICAL APPLICATIONS
750kHz, 5V to 40V, 150mA Boost Converter
Wide Input Range SEPIC Converter with 5V Output Switches at 2.5MHz
Transient Response with 400mA to 500mA Output Load Step
C2
2.2μF
V
OUT
40V
150mA
L1
47μH
D1
464k
V
IN
5V
V
IN
SW
3580 TA02
LT3580
121k
10k
SHDN
GND
FB
VC
SYNC SS
RT
4.7nF
0.1μF
47pF
C1
2.2μF
C1: 2.2μF, 25V, X5R, 1206
C2: 2.2μF, 50V, X5R, 1206
D1: MICROSEMI UPS140
L1: SUMIDA CDRH105R-470
C2
10μF
V
OUT
5V, 600mA (V
IN
= 5V OR HIGHER)
500mA (V
IN
= 4V)
400mA (V
IN
= 3V)
300mA (V
IN
= 2.6V)
L1
4.7μH
C3
1μF
L2
4.7μH
D1
46.4k
V
IN
2.6V TO 12V
OPERATING
12V TO 32V
TRANSIENT
V
IN
SW
3580 TA03a
LT3580
35.7k
10k
SHDN
GND
FB
VC
SYNC SS
RT
1nF
22pF
0.1μF
C1
2.2μF
C1: 2.2μF, 35V, X5R, 1206
C2: 10μF, 10V, X5R, 1206
C3: 1μF, 50V, X5R, 0805
D1: MICROSEMI UPS140
L1, L2: TDK VLCF4020T-4R7N1R2
V
OUT
100mV/DIV
AC COUPLED
I
L1
+I
L2
0.5A/DIV
100μs/DIVV
IN
= 12V
3580 TA03b
