LTC3631 Linear Technology Corporation, LTC3631 Datasheet - Page 17

• Manufacturer Part Number: LTC3631
• Description: High Voltage 100mA Synchronous Step-Down Converter
• Manufacturer: Linear Technology Corporation

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TYPICAL APPLICATIONS
15V TO 45V
4.5V TO 33V
V
IN
V
IN
High Effi ciency 15V, 20mA Regulator
C
1μF
IN
C
1μF
IN
C
C
L1: TDK SLF7045T-102MR14
IN
OUT
Positive-to-Negative Converter
: AVX 18125C105KAT2A
: TDK C3216X7R1E475KT
V
RUN
I
SS
C
C
L1: TYCO/COEV DQ6545-101M
SET
V
RUN
I
HYST
IN
IN
OUT
SET
IN
LTC3631
: TDK C3225X7R1H105KT
LTC3631
GND
: MURATA GRM32DR71C106KA01
GND
HYST
SW
V
V
FB
SW
7V TO 45V
SS
FB
1000μH
100μH
V
L1
IN
L1
Small Size, Limited Peak Current, 20mA Regulator
R1
3M
R2
169k
3631 TA07a
R1
1M
R2
71.5k
C
1μF
IN
R3
470k
R4
100k
R5
33k
C
C
L1: MURATA LQH43CN471K03
IN
OUT
C
4.7μF
: TDK C3225X7R1H105KT
C
10μF
OUT
: AVX 08056D106KAT2A
3631 TA04a
OUT
V
–12V
V
RUN
HYST
I
OUT
SET
IN
LTC3631
V
15V
20mA
OUT
GND
SW
V
SS
FB
470μH
L1
R1
470k
R2
88.7k
100
3631 TA05a
100
Maximum Load Current vs Input Voltage
90
80
70
60
50
40
30
20
95
90
85
80
75
70
65
60
0.1
5
I
SET
10
OPEN
Effi ciency vs Load Current
C
10μF
OUT
15
LOAD CURRENT (mA)
V
1
V
V
5V
20mA
20
IN
OUT
OUT
VOLTAGE (V)
= –3V
25
V
V
OUT
OUT
30
= –12V
10
= –5V
V
V
V
35
IN
IN
IN
= 24V
= 36V
= 45V
40
3631 TA04b
3631 TA07b
LTC3631
100
45
17
3631fa