LTC3642 Linear Technology, LTC3642 Datasheet - Page 17

• Manufacturer Part Number: LTC3642
• Description: High Voltage 50mA Synchronous Step-Down Converter
• Manufacturer: Linear Technology

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