LTC3642
TYPICAL APPLICATIONS
Positive-to-Negative Converter
Maximum Load Current vs Input Voltage
L1
50
45
40
35
30
25
20
15
10
100ꢀH
V
= –3V
V
OUT
V
IN
V
SW
LTC3642
RUN
IN
4.5V TO 33V
C
IN
R1
= –5V
OUT
1ꢀF
1M
C
OUT
I
V
FB
SET
10ꢀF
V
= –12V
OUT
HYST
GND
SS
R2
71.5k
V
OUT
–12V
C
C
: TDK C3225X7R1H105KT
IN
OUT
3642 TA04a
: MURATA GRM32DR71C106KA01
L1: TYCO/COEV DQ6530-101M
25 30
VOLTAGE (V)
5
10 15 20
35 40 45
V
IN
3642 TA04b
Small Size, Limited Peak Current, 10mA Regulator
L1
470ꢀH
V
OUT
V
IN
V
SW
LTC3642
5V
10mA
IN
7V TO 45V
C
R3
R1
C
IN
OUT
1ꢀF 470k
470k
10ꢀF
RUN
V
FB
R4
100k
R2
88.7k
HYST
SS
3642 TA05a
R5
33k
I
GND
SET
C
C
: TDK C3225X7R1H105KT
IN
: AVX 08056D106KAT2A
OUT
L1: MURATA LQH32CN471K23
High Efficiency 15V, 10mA Regulator
Efficiency vs Load Current
100
95
90
85
80
75
70
65
L1
4700ꢀH
V
OUT
V
IN
15V
V
V
= 24V
= 36V
V
SW
LTC3642
IN
IN
IN
15V TO 45V
10mA
C
R1
C
IN
OUT
1ꢀF
3M
4.7ꢀF
RUN
V
FB
R2
169k
I
SET
SS
HYST
GND
V
= 45V
IN
3642 TA07a
C
C
: AVX 18125C105KAT2A
IN
OUT
: TDK C3216X7R1E475KT
L1: COILCRAFT DS1608C-475
60
0.1
1
10
LOAD CURRENT (mA)
3642 TA07b
3642f
17
Linear [ Linear ]
