Datasheet

LT1618
12
sn1618 1618fas
TYPICAL APPLICATIONS
U
USB to 5V SEPIC Converter
Efficiency
USB SEPIC During Start-Up
USB SEPIC Start-Up with Output Shorted
LOAD CURRENT (mA)
0
EFFICIENCY (%)
350
1618 F09b
100
250
80
75
70
65
60
50 150 200
300
1ms/DIV
1618 TA10
V
OUT
2V/DIV
I
IN
50mA/DIV
1ms/DIV
1618 TA11
V
OUT
2V/DIV
50mA/DIV
SHDN
I
ADJ
V
C
V
IN
SW
ISN
ISP
FB
LT1618
R1
316k
R2
107k
V
IN
5V
C1
4.7µF
10nF
C2
10µF
1618 • TA09a
D1
L1
10µH
L2
10µH
3
2
1
9
8
7
GND
5104
0.1Ω
2k
13k
20k
V
OUT
5V
C3
0.47µF
I
IN
C1: TAIYO YUDEN JMK212BJ475 [phone]
C2: TAIYO YUDEN JMK316BJ106 [phone]
C3: TAIYO YUDEN EMK212BJ474 [phone]
D1: ON SEMICONDUCTOR MBR0520 [phone]
L1: SUMIDA CR43-100 [phone]
OFF
ON
0V
3.3V
100mA
500mA
0V
3.3V