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| LTC3642 Datasheet, PDF (17/20 Pages) Linear Technology – High Effi ciency, High Voltage 50mA Synchronous Step-Down Converter | |||
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TYPICAL APPLICATIONS
Positive-to-Negative Converter
VIN
4.5V TO 33V
L1
100μH
VIN
SW
CIN
1μF
LTC3642
RUN
R1
1M
ISET
VFB
HYST
SS
GND
R2
71.5k
CIN: TDK C3225X7R1H105KT
COUT: MURATA GRM32DR71C106KA01
L1: TYCO/COEV DQ6530-101M
COUT
10μF
VOUT
â12V
3642 TA04a
LTC3642
Maximum Load Current vs Input Voltage
50
VOUT = â3V
45
40
VOUT = â5V
35
VOUT = â12V
30
25
20
15
10
5 10 15 20 25 30 35 40 45
VIN VOLTAGE (V)
3642 TA04b
Small Size, Limited Peak Current, 10mA Regulator
VIN
7V TO 45V
VIN
SW
CIN R3
1μF 470k
LTC3642
RUN
VFB
R4
100k
HYST
SS
R5
ISET GND
33k
L1
470μH
R1
470k
R2
88.7k
3642 TA05a
COUT
10μF
VOUT
5V
10mA
CIN: TDK C3225X7R1H105KT
COUT: AVX 08056D106KAT2A
L1: MURATA LQH32CN471K23
VIN
15V TO 45V
High Efï¬ciency 15V, 10mA Regulator
L1
4700μH
VIN
SW
CIN
LTC3642
R1
1μF
3M
COUT
4.7μF
VOUT
15V
10mA
RUN
VFB
ISET
R2
169k
SS
HYST
GND
3642 TA07a
CIN: AVX 18125C105KAT2A
COUT: TDK C3216X7R1E475KT
L1: COILCRAFT DS1608C-475
Efï¬ciency vs Load Current
100
95
90
85
80
75
70
65
60
0.1
VIN = 24V
VIN = 36V
VIN = 45V
1
LOAD CURRENT (mA)
10
3642 TA07b
3642f
17
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