LTC3631_15 Datasheet, PDF (17/22 Pages) Linear Technology – High Efficiency, High Voltage 100mA Synchronous Step-Down Converter

TYPICAL APPLICATIONS
V_IN
5V TO 45V
C_IN
4.7µF
V_IN
SW
LTC3631
RUN
V_FB
HYST
I_SET
SS
GND
L1
100µH
R1
1.47M
R2
280k
C_SS
47nF
3631 F10a
C_IN: TDK C5750X7R2A475MT
C_OUT: AVX 1812D107MAT
L1: TDK SLF7045T-101MR50-PF
V_OUT
C_OUT ^5V
100µF
Figure 10. High Efficiency 5V Regulator
LTC3631
3.3V, 100mA Regulator with Peak Current Soft-Start, Small Size
V_IN
4.5V TO 24V
C_IN
1µF
C_SS
22nF
V_IN
SW
LTC3631
RUN
V_FB
I_SET
SS
HYST
GND
L1
22µH
R1
294k
R2
93.1k
3642 TA03a
V_OUT
3.3V
C_OUT 100mA
10µF
C_IN: TDK C3216X7R1E105KT
C_OUT: AVX 08056D106KAT2A
L1: MURATA LQH43CN220K03
Soft-Start Waveforms
OUTPUT
VOLTAGE
1V/DIV
INDUCTOR
CURRENT
50mA/DIV
500µs/DIV
3631 TA03b
V_IN
4.5V TO 33V
Positive-to-Negative Converter
L1
100µH
V_IN
SW
C_IN
1µF
LTC3631
RUN
R1
1M
I_SET
V_FB
HYST
SS
GND
R2
71.5k
C_IN: TDK C3225X7R1H105KT
C_OUT: MURATA GRM32DR71C106KA01
L1: TYCO/COEV DQ6545-101M
C_OUT
10µF
V_OUT
–12V
3631 TA04a
Maximum Load Current vs Input Voltage
100 _{ISET OPEN}
90
V_OUT = –3V
80
V_OUT = –5V
70
V_OUT = –12V
60
50
40
30
20
5 10 15 20 25 30 35 40 45
INPUT VOLTAGE (V)
3631 TA04b
For more information www.linear.com/LTC3631
3631fe
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