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LTC3631
17
3631fe
For more information www.linear.com/LTC3631
Typical applicaTions
Figure 10. High Efficiency 5V Regulator
V
IN
LTC3631
RUN
C
IN
4.7µF
HYST
3631 F10a
SW
V
IN
5V TO 45V
V
OUT
5V
V
FB
SS
I
SET
GND
L1
100µH
R1
1.47M
R2
280k
C
IN
: TDK C5750X7R2A475MT
C
OUT
: AVX 1812D107MAT
L1: TDK SLF7045T-101MR50-PF
C
OUT
100µF
C
SS
47nF
3.3V, 100mA Regulator with Peak Current Soft-Start, Small Size Soft-Start Waveforms
V
IN
LTC3631
RUN
C
IN
1µF
SS
3642 TA03a
SW
V
IN
4.5V TO 24V
V
OUT
3.3V
100mA
V
FB
HYST
I
SET
GND
L1
22µH
R1
294k
R2
93.1k
C
IN
: TDK C3216X7R1E105KT
C
OUT
: AVX 08056D106KAT2A
L1: MURATA LQH43CN220K03
C
OUT
10µF
C
SS
22nF
OUTPUT
VOLTAGE
1V/DIV
INDUCTOR
CURRENT
50mA/DIV
500µs/DIV
3631 TA03b
Positive-to-Negative Converter Maximum Load Current vs Input Voltage
V
IN
LTC3631
RUN
C
IN
1µF
HYST
3631 TA04a
SW
V
IN
4.5V TO 33V
V
OUT
–12V
V
FB
SS
I
SET
GND
L1
100µH
R1
1M
R2
71.5k
C
IN
: TDK C3225X7R1H105KT
C
OUT
: MURATA GRM32DR71C106KA01
L1: TYCO/COEV DQ6545-101M
C
OUT
10µF
INPUT VOLTAGE (V)
5
MAXIMUM LOAD CURRENT (mA)
60
80
45
3631 TA04b
40
20
15
25
35
10
20
30
40
100
50
70
30
90
V
OUT
= –3V
I
SET
OPEN
V
OUT
= –5V
V
OUT
= –12V
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