LTC3632 LINER [Linear Technology], LTC3632 Datasheet - Page 17

• Manufacturer Part Number: LTC3632
• Description: High Effi ciency, High Voltage 20mA Synchronous Step-Down Converter
• Manufacturer: LINER [Linear Technology]

TYPICAL APPLICATIONS
4.5V TO 24V
3.3V, 20mA Regulator with Peak Current Soft-Start, Small Size
4.5V TO 38V
V
V
IN
IN
0.1μF
C
SS
C
1μF
C
1μF
IN
C
C
L1: MURATA LQH43CN471K03
IN
IN
OUT
Positive-to-Negative Converter
: TDK C3216X7R1E105KT
: AVX 08056D106KAT2A
V
RUN
I
SS
C
C
L1: TYCO/COEV DQ6545-102M
SET
V
RUN
I
HYST
IN
OUT
IN
SET
IN
: TDK C3225X7R1H105KT
LTC3632
LTC3632
: MURATA GRM32DR71C106KA01
GND
GND
HYST
V
SW
V
SW
FB
SS
FB
470μH
5V TO 50V
L1
1mH
L1
V
IN
R1
294k
R2
93.1k
3632 TA03a
R1
1M
R2
71.5k
Figure 11. High Effi ciency 5V Regulator
C
4.7μF
IN
C
C
L1: COILCRAFT LPS6235-105ML
C
10μF
IN
OUT
C
10μF
OUT
: TDK C5750X7R2A475MT
3632 TA04a
OUT
V
–12V
: AVX 1812D107MAT
OUT
V
3.3V
20mA
V
RUN
HYST
I
OUT
SET
IN
LTC3632
GND
V
SW
SS
FB
INDUCTOR
1mH
20mA/DIV
CURRENT
L1
VOLTAGE
OUTPUT
3632 F11
1V/DIV
C
470nF
SS
Maximum Load Current vs Input Voltage
20
15
10
5
R1
4.2M
R2
800k
5
I
SET
10
OPEN
15
C
100μF
V
Soft-Start Waveforms
IN
OUT
20
INPUT VOLTAGE (V)
V
OUT
V
OUT
25
V
5V
20mA
OUT
= –3V
= –12V
2ms/DIV
30
V
OUT
35
= –5V
40
3632 TA04b
45
LTC3632
50
3632 TA03b
17
3632fb