Datasheet

LT1946
10
1946fb
TYPICAL APPLICATIO S
U
12V Output Boost Converter
Efficiency
V
OUT
100mV/DIV
AC COUPLED
I
LI
0.5A/DIV
V
IN
= 3.3V 100µs/DIV 1946 TA02b
Transient Response
175mA
100mA
I
LOAD
V
IN
V
IN
3.3V TO 5V
SW
FB
LT1946
L1
4.7µH
D1
C
SS
100nF
C
C
470pF
R
C
33.3k
V
OUT
12V
410mA, V
IN
= 5V
275mA, V
IN
= 3.3V
1946 TA02
C2
4.7µF
C1
4.7µF
V
C
GNDCOMPSS
SHDN
3
65
478
21
C1: 4.7µF, X5R OR X7R, 6.3V
C2: 4.7µF, X5R OR X7R, 16V
D1: MICROSEMI UPS120 OR EQUIVALENT
L1: TDK RLF5018T-4R7M1R4
R1
84.5k
R2
9.76k
OFF ON
LOAD CURRENT (mA)
0
EFFICIENCY (%)
65
70
75
300
500
1946 TA02a
60
55
50
100 200 400
80
85
90
V
IN
= 5V
V
IN
= 3.3V