Datasheet
LT3477
15
3477fc
TYPICAL APPLICATIONS
800mA, 5V to 12V Boost Converter With Accurate Input Current Limit Effi ciency
I
SN1
I
SP1
V
IN
I
ADJ1
I
ADJ2
I
SP2
I
SN2
FBN
R3
200k
R4
23.2k
C1
2.2μF
V
IN
5V
C3
10nF
C1: TAIYO YUDEN LMK316BJ225MD
C2: AVX 1206YD106MAT
D1: DIODES INC. B320A
L1: TOKO FDV0630-4R7M
C2
10μF
12V
0.8A
3477 TA04a
R2
17.8k
SW
L1
4.7μH
R1
0.033Ω
D1
FBP SSGND
LT3477
R
T
V
C
SHDN
V
REF
SHDN
C
C
4.7nF
R
C
1k
I
OUT
(A)
0
EFFICIENCY (%)
70
75
80
0.4 0.5 0.6 0.7 0.8
3477 TA04b
65
60
50
0.1
0.2
0.3
55
90
85
5.5V SEPIC Converter With Short-Circuit Protection
Effi ciency
I
SN1
I
SP1
V
IN
I
ADJ1
I
ADJ2
FBN
I
SP2
R4
34.8k
R3
0.15Ω
R1
0.04Ω
R5
10k
C1
3.3μF
V
IN
3V TO
16V
C4
33nF
C1: TAIYO YUDEN LMK316BJ335ML
C2: TAIYO YUDEN LMK325BJ106MN
C3: TAIYO YUDEN LMK316BJ106ZL
D1: DIODES INC. DFLS130L
L1, L2: TOKO FDV0630-4R7M
C3
10μF
C
C
4.7nF
5.5V
670mA
3477 TA02a
R2
18.2k
R
C
1k
SW
L1
4.7μH
C2
10μF
L2
4.7μH
D1
FBP SSGND
LT3477
I
SN2
R
T
SHDN
V
C
V
REF
SHDN
I
OUT
(A)
0
EFFICIENCY (%)
85
0.3
3477 TA02b
70
60
0.1 0.2 0.4
55
50
90
80
75
65
0.5 0.6 0.7
V
IN
= 3V