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LM2576S Datasheet(PDF) 15 Page - Semtech Corporation

Part # LM2576S
Description  1A & 3A Miniconverter Switching Regulators
Download  19 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

LM2576S Datasheet(HTML) 15 Page - Semtech Corporation

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15
ã 2001 Semtech Corp.
www.semtech.com
LM2575 & LM2576
POWER MANAGEMENT
5
7
5
2
M
L6
7
5
2
M
L
C
N
I
F
µ
7
4F
µ
0
0
1
1
D
A
3A
7
1
L
H
µ
0
0
1H
µ
8
6
C
T
U
O
F
µ
0
0
7
,
2F
µ
0
0
8
,
6
I
T
U
O
A
m
0
5
2A
m
0
0
5
5
7
5
2
M
L6
7
5
2
M
L
C
N
I
F
µ
7
4F
µ
0
0
1
1
D
A
3A
7
1
L
H
µ
0
0
1H
µ
8
6
C
T
U
O
F
µ
0
7
4F
µ
0
0
7
,
2
I
T
U
O
A
m
0
0
1A
m
0
5
7
Inverting buck/boost operation is a different topology of
operation than buck. This difference reduces the output
current capability of the device, in that the inductor must
supply all of the load current during the time the power
switch is off. Maximum output current is approximately:
)
2576
LM
(
V
V
1
2
5
.
3
I
IN
O
OUT

+
≈
)
2575
LM
(
V
V
1
2
3
.
1
I
IN
O
OUT

+
≈
Component stress requirements are very similar to the
buck with a few exceptions:
(1) catch diode breakdown V
BR must be greater than
V
IN + |VOUT|
(2) input capacitor is larger due to the increased peak
current during switch turn on. Power dissipation is
approximately:
IN
O
IN
SAT
IN
O
O
IN
O
O
D
V
V
V
02
.
0
V
V
V
1
I
V
V
V
P
+
+
+
≈
Please contact factory for additional assistance when
using the buck/boost topology.
Applications Information - Inverting Buck/Boost


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