Datasheet
14
LT3433
3433f
TYPICAL APPLICATIO S
U
8V-60V to 12V Converter
V
BST
SW_H
V
IN
BURST_EN
V
C
V
FB
SW_L
PWRGND
V
OUT
V
BIAS
SHDN
SS
SGND
LT3433
D2
1N4148
C7
0.47µF
20V
R3
174k
1%
R2
20k
1%
(BURST)
R1 68k
C2 1nF
(NO BURST)
V
IN
8V TO 60V
3433 TA04a
C6
0.1µF
20V
C4
0.01µF
D1
1N4148
L1
200µH
TDK SLF12565T-221M1R0
D
S2
B120A
C6
2.2µF
100V
D
S1
B160A
C3 330pF
C5
47µF
25V
MODE SWITCH:
V
IN
H-L: 16.6V
V
IN
L-H: 17V
V
OUT
12V
8V < V
IN
< 18V: 125mA
18V < V
IN
< 60V: 380mA
+
Efficiency Minimum Output Current vs V
IN
OUTPUT CURRENT (mA)
40
EFFICIENCY (%)
60
70
90
100
0.1 10 100 1000
3433 TA04b
20
1
80
50
30
V
IN
= 20V
V
IN
= 8V
V
IN
= 8V
(BURST)
V
IN
= 20V
(BURST)
V
IN
(V)
0
0
I
OUT(MAX)
(mA)
100
200
300
400
500
10
20 30 40
3433 TA04c
50 60
BRIDGED
BUCK