Datasheet

22
LTC1530
1530fa
LTC1530 Synchronous SEPIC Converter
LOAD CURRENT (A)
0
0.1
EFFICIENCY (%)
0.5 1.0
1.5 2.0
2.5 3.0 3.5
1530 TA08b
4.0
100
90
80
70
60
50
40
30
20
10
0
T
A
= 25°C
V
IN
= 8V
V
IN
= 4V
Efficiency vs Load Current
GND
FB
1
4
5
5
2
4
6
6
7
8
3
2
3
1
SHDN
SW
V
IN
V
C
R8
33k
R7
300k
R6
2.2M
C
C
0.22µF
C1
1000pF
C6
100pF
C9
4.7µF
D1
MBR0520
Q1
N-MOSFET
D2
1N4148
Q2
P-MOSFET
L1B
•
•
L1A
L2
10µH
V
OUT
5V
4A
V
OUT
C
OUT
C2
10µF
1530 TA08a
R9
5.6Ω
C8
4.7µF
C7
3000pF
+
+
+
C4
0.1µF
C3
10µF
+
+
+
+
C5
4.7µF
+
R
C
4.7k
R1
2.2k
R5
20Ω
R
SENSE
0.02Ω
V
IN
4V TO 8V
C
IN
C
FLY
I
FB
PV
CC
I
MAX
LTC1530-ADJ
LT1317
V
SENSE
R3
3.09k
R4
1k
R2
10k
GND
G1
G2
4
8
7
3
1
LTC1693-3
C
IN
, C
OUT
= 3× SANYO 10MV1200GX
C
FLY
= 2× SANYO 16SA150MK
L1 = COILTRONIX CTX02-13198-1
(L1A = 1,2,3 → 7,8,9; L1B = 10,11,12 → 4,5,6)
L2 = SUMIDA CD43-100
Q1 = SILICONIX N-MOSFET SI4420DY
Q2 = SILICONIX P-MOSFET SI4425DY
R
SENSE
= DALE LVR-3 3W
COMP
1,2,3
4,5,6
10,11,12
7,8,9
TYPICAL APPLICATIO S
U