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| LTC3631 Datasheet, PDF (17/22 Pages) Linear Technology – High Effi ciency, High Voltage 100mA Synchronous Step-Down Converter | |||
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TYPICAL APPLICATIONS
VIN
5V TO 45V
CIN
4.7μF
VIN
SW
LTC3631
RUN
VFB
HYST
ISET
SS
GND
L1
100μH
R1
1.47M
R2
280k
CSS
47nF
3631 F10a
CIN: TDK C5750X7R2A475MT
COUT: AVX 1812D107MAT
L1: TDK SLF7045T-101MR50-PF
VOUT
COUT 5V
100μF
Figure 10. High Efï¬ciency 5V Regulator
LTC3631
3.3V, 100mA Regulator with Peak Current Soft-Start, Small Size
VIN
4.5V TO 24V
CIN
1μF
CSS
22nF
VIN
SW
LTC3631
RUN
VFB
ISET
SS
HYST
GND
L1
22μH
R1
294k
R2
93.1k
3642 TA03a
VOUT
3.3V
COUT 100mA
10μF
CIN: TDK C3216X7R1E105KT
COUT: AVX 08056D106KAT2A
L1: MURATA LQH43CN220K03
Soft-Start Waveforms
OUTPUT
VOLTAGE
1V/DIV
INDUCTOR
CURRENT
50mA/DIV
500μs/DIV
3631 TA03b
VIN
4.5V TO 33V
Positive-to-Negative Converter
L1
100μH
VIN
SW
CIN
1μF
LTC3631
RUN
R1
1M
ISET
VFB
HYST
SS
GND
R2
71.5k
CIN: TDK C3225X7R1H105KT
COUT: MURATA GRM32DR71C106KA01
L1: TYCO/COEV DQ6545-101M
COUT
10μF
VOUT
â12V
3631 TA04a
Maximum Load Current vs Input Voltage
100 ISET OPEN
90
VOUT = â3V
80
VOUT = â5V
70
VOUT = â12V
60
50
40
30
20
5 10 15 20 25 30 35 40 45
VIN VOLTAGE (V)
3631 TA04b
3631fb
17
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