Datasheet

LT1618
13
sn1618 1618fas
TYPICAL APPLICATIO S
U
Efficiency
12V Boost Converter with 500mA Input Current Limit
12V Boost Converter Start-Up with Input Current Limit
(V
IN
= 1.8V, I
LOAD
= 40mA)
12V Boost Converter Start-Up without Input Current Limit
(V
IN
= 1.8V, I
LOAD
= 40mA)
L0AD CURRENT (mA)
0
EFFICIENCY (%)
120 140
1618 TA06b
40 80
90
85
80
75
70
65
60
20 60 100 160
V
IN
= 5V
V
IN
= 3.3V
SHDN
I
ADJ
V
C
V
IN
SW
ISN
ISP
FB
LT1618
R1
909k
R2
107k
V
IN
1.8V TO 5V
C1
4.7µF
10nF
C2
4.7µF
1618 • TA06a
D1
L1
10µH
3
2
1
9
8
7
GND
510
4
0.1Ω
2k
V
OUT
12V
C1: TAIYO YUDEN JMK212BJ475 [phone]
C2: TAIYO YUDEN EMK316BJ475 [phone]
D1: ON SEMICONDUCTOR MBR0520 [phone]
L1: SUMIDA CR43-100 [phone]
I
L1
50µs/DIV
1618 TA07
V
OUT
5V/DIV
I
LI
200mA/DIV
50µs/DIV
1618 TA08
V
OUT
5V/DIV
I
LI
200mA/DIV