LT3014
TYPICAL APPLICATIO S
U
5V Buck Converter with Low Current Keep Alive Backup
D2
D1N914
6
C2
L1†
15µH
0.33µF
BOOST
V
V
IN
OUT
4
2
5.5V*
V
SW
5V
IN
C3
4.7µF
100V
D1
TO 60V
1A/20mA
10MQ060N
LT1766
CERAMIC
15
14
10
12
SHDN
BIAS
FB
R1
C1
+
15.4k
100µF 10V
SOLID
SYNC
GND
R2
4.99k
TANTALUM
V
C
1, 8, 9, 16 11
C
C
1nF
3014 TA03
IN
OUT
*FOR INPUT VOLTAGES BELOW 7.5V,
SOME RESTRICTIONS MAY APPLY
† INCREASE L1 TO 30µH FOR LOAD
CURRENTS ABOVE 0.6A AND TO
60µH ABOVE 1A
LT3014
3.92M
1.27M
OPERATING
CURRENT
SHDN
ADJ
HIGH
LOW
GND
Buck Converter
Efficiency vs Load Current
100
V
= 5V
OUT
L = 68µH
V
V
= 10V
= 42V
IN
IN
90
80
70
60
50
0
0.25
0.50
0.75
1.00
1.25
LOAD CURRENT (A)
3014 TA04
3014fb
12
Linear [ Linear ]
