Datasheet

13
LT1371
TYPICAL APPLICATIONS N
U
Positive-to-Negative Converter with Direct Feedback Dual Output Flyback Converter with Overvoltage Protection
2 Li-Ion Cells to 5V SEPIC Converter**
Single Li-Ion Cell to 5V
LT1371
V
IN
GND
V
IN

4V TO 9V
V
C
FB
LT1371 • TA05
V
SW
S/S
C1
33µF
20V
C4
0.047µF
C5
0.0047µF
R1
2k
R3
6.19k
1%
R2
18.7k
1%

V
OUT
†
5V
C3
100µF
10V
× 2
ON
OFF
L1A*
10µH

•
•
L1B*
10µH

C2
4.7µF
C1 = AVX TPSD 336M020R0200
C2 = TOKIN 1E475ZY5U-C304
C3 = AVX TPSD107M010R0100
SINGLE INDUCTOR WITH TWO WINDINGS
COILTRONICS CTX10-4
INPUT VOLTAGE MAY BE GREATER OR
LESS THAN OUTPUT VOLTAGE



+
+
MBRS330T3
V
IN

4V
5V
7V
9V
I
OUT

0.85A
1A
1.3A
1.5A
†
MAX I
OUT
*

**
LT1371
V
IN
V
C
V
IN

2.7V TO 13V
*COILTRONICS CTX10-4
GND
NFB
LT1371 • TA03
V
SW
S/S
D2
P6KE-15A
D3
1N4148
D1
MBRS330T3
C1
100µF
C2
0.047µF
C3
0.0047µF
R1
2k
R3
2.49k
1%
R2
2.49k
1%
–V
OUT
†
–5V
+
C4
100µF
× 2
+
ON
OFF
V
IN

3V
5V
9V
I
OUT

0.6A
1.0A
1.5A
2
1
4
T1*
3
•
•
†
MAX I
OUT


LT1371
V
IN
V
C
GND
FB
LT1371 • TA06
V
SW
S/S
L1*
C1**
100µF
10V
SINGLE
Li-Ion
CELL
C4**
100µF
10V
× 2
C2
0.047µF
C3
0.0047µF

R3
2k
R2
6.19k
1%
R1
18.7k
1%
V
OUT
†

5V
D1
MBRS320T3
ON
OFF
*
**
COILCRAFT DO3316P-103
AVX TPSD107M010R0100
+ +
+
V
IN

2.7V
3.3V
3.6V
I
OUT

1.2A
1.6A
1.8A
†
MAX I
OUT


LT1371
V
IN
FB
V
C
V
IN

2.7V TO 10V
*DALE LPE-5047-100MB
GND
NFB
LT1371 • TA04
V
SW
S/S
P6KE-20A
1N4148
MBRS360T3
MBRS360T3
C1
22µF
R2
6.19k
1%
R1
68.1k
1%
C2
0.047µF
C3
0.0047µF
R3
2k
R5
2.49k
1%
R4
12.1k
1%
–V
OUT

–15V
V
OUT

15V
+
C4
47µF
+
C5
47µF
+
ON
OFF
2, 3
8, 9
7
T1*
4
10
1
•
•
•