LM2575 & LM2576
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless otherwise specified: V
IN
= 12V for 3.3V, 5V and ADJ options and 25V for 12V option; V
OUT
= 5V for ADJ option; T
A
= 25ºC; V
IN
rated = 40V;
I
O
= 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in
bold
apply over full operating temperature range.
Parameter
Output Voltage
LM2575-3.3
Sy mbol
V
O
Test C onditions
I
O
= 0.2A
8V to V
IN
Rated
Min
3.23
3.20
3.14
Ty p
3.30
Max
3.37
3.40
3.47
U nits
V
Output Voltage
LM2575-5
V
O
I
O
= 0.2A
8V to V
IN
Rated
4.90
4.85
4.75
5.00
5.10
5.15
5.25
V
Output Voltage
LM2575-12
V
O
I
O
= 0.2A
15V to V
IN
Rated
11.76
11.52
11.40
12.00
12.24
12.48
12.60
V
Feedback Voltage
LM2575-AD J, V
O
= 5V
V
FB
I
O
= 0.2A
8V to V
IN
Rated
1.217
1.193
1.180
1.230
1.243
1.267
1.280
V
Feedback Bi as C urrent
LM2575-AD J
Effi ci ency/Opti on
3.3V
5V
12V
A D J, V
O
= 5 V
Swi tchi ng Frequency
I
B
V
IN
= 12V, I
O
= 0.2A
50
100
500
nA
h
V
IN
= 12V, I
O
= 1A (LM2575, 3A for LM2576)
77
82
%
V
IN
= 15V, I
O
= 1A (LM2575, 3A for LM2576)
V
IN
= 12V, I
O
= 1A (LM2575, 3A for LM2576)
f
SX
47
43
88
82
52
58
62
0.9
0.9
93
1.7
1.3
98
2.2
3.0
3.2
5.8
6.9
7.5
A
1.2
1.4
%
A
V
kHz
Saturati on Voltage
(1)
V
SAT
LM2575, I
O
= 1A
LM2576, I
O
= 3A
Max. D uty C ycle (On)
(3)
Peak C urrent LM2575
(1)
DC
I
CL
Peak C urrent LM2576
(1)
I
CL
4.2
3.5
ã
2001 Semtech Corp.
3
www.semtech.com
SEMTECH [ SEMTECH CORPORATION ]
