lt1618ems-trpbf Linear Technology Corporation, lt1618ems-trpbf Datasheet - Page 12

• Manufacturer Part Number: lt1618ems-trpbf
• Description: Constant-current/constant-voltage 1.4mhz Step-up Dc/dc Converter
• Manufacturer: Linear Technology Corporation

LT1618
12
TYPICAL APPLICATIONS
100mA 500mA
0V
50mA/DIV
V
OFF ON
5V
0V
IN
3.3V
2V/DIV
3.3V
V
4.7µF
C1: TAIYO YUDEN JMK212BJ475
C2: TAIYO YUDEN JMK316BJ106
C3: TAIYO YUDEN EMK212BJ474
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CR43-100
OUT
I
I
IN
IN
C1
USB SEPIC During Start-Up
20k
USB to 5V SEPIC Converter
0.1Ω
8
9
13k
3
1ms/DIV
ISP
V
SHDN
I
4
ISN
ADJ
IN
2
LT1618
10µH
GND
5
L1
[phone]
[phone]
[phone]
[phone]
[phone]
10
U
SW
V
FB
C
7
2k
0.47µF
10nF
1
C3
1618 TA10
L2
10µH
D1
R1
316k
R2
107k
1618 • TA09a
V
5V
C2
10µF
OUT
50mA/DIV
2V/DIV
V
OUT
USB SEPIC Start-Up with Output Shorted
80
75
70
65
60
0
50
100
LOAD CURRENT (mA)
Efficiency
150
1ms/DIV
200
250
300
1618 F09b
1618 TA11
350
sn1618 1618fas