LT1431C Linear Technology, LT1431C Datasheet - Page 8

• Manufacturer Part Number: LT1431C
• Description: Programmable Reference
• Manufacturer: Linear Technology

TYPICAL APPLICATIO S
LT1431
V
8
TO 5.5V
IN
4.5V
LT107268.6% AT 2.2W
LT107161.1% AT 4.4W
LT117267.8% AT 2.2W
MEASURED EFFICIENCY
12V to 5V Buck Converter with Foldback Current Limit*
+
*CONTACT LTC FOR HIGH EFFICIENCY
SWITCHING REGULATORS
3
4
5k
V
LOGIC IN
V
R
50 F
IN
GND-S
COMP
+
TOP
HI-SIDE SWITCH
5
2
LT1089
LT1431
GND
V
IN
OUT
OUT
OUT
Isolated 5V to 15V Flyback Converter
0.47 F
GND-F
COLL
LT1172
LT1072
GND
OR
6
V
1
R
REF
OUT
MID
1500pF
V
V
OUT
8
7
C
PULSE ENGINEERING
3k
1.5k
MUR105
0.68 F
#PE-51515
4N36
MBR735
COILTRONICS
CTX02-11934
U
•
6, 7
4, 5
10
9
2
1
100
0.5W
•
•
MUR105
MUR105
0.1 F
2.4k
+
+
+
3300 F
LT1431 • TA09
5V, 7A
20k
C*
C*
1
2
COLL
COMP
GND-S
15k
5
LT1431
–15V, 70mA
15V, 70mA
GND-F
V
80
70
50
30
+
60
40
6
3
REF
0
8
1
Buck Converter Efficiency
LT1431 • TA11
*L BELL INDUSTRIES J.W. MILLER
13.3k
2.7k
2
+
Fully Loaded Output Ripple vs Filtering
DIVISION 9310-36 10 H, 450mA
3
100 F
+
I
LOAD
L*
C*
4
210 F
(A)
+
5
100 F
6
V
V
V
LT1431 • TA10
IN
IN
IN
= 9V
= 12V
= 15V
7
30mV
LT1172
6mV
8
P-P
P-P
40mV
LT1072
8mV
LT1431 • TA12
P-P
P-P