LM2575 & LM2576
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless otherwise specified: VIN = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT = 5V for ADJ option; TA = 25ºC; VIN rated = 40V;
IO = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
IO = 0.2A
Min
3.23
3.20
3.14
4.90
4.85
4.75
Typ
Max Units
Output Voltage
LM2575-3.3
VO
3.30
3.37
3.40
3.47
5.10
5.15
5.25
V
8V to VIN Rated
Output Voltage
LM2575-5
VO
VO
VFB
IB
IO = 0.2A
5.00
V
V
8V to VIN Rated
Output Voltage
LM2575-12
IO = 0.2A
11.76 12.00 12.24
15V to VIN Rated
11.52
12.48
11.40
12.60
Feedback Voltage
IO = 0.2A
1.217 1.230 1.243
V
LM2575-ADJ, VO = 5V
8V to VIN Rated
1.193
1.267
1.280
100
1.180
Feedback Bias Current
LM2575-ADJ
Efficiency/Option
3.3V
VIN = 12V, IO = 0.2A
50
nA
%
500
VIN = 12V, IO = 1A (LM2575, 3A for LM2576)
77
82
88
82
52
h
5V
12V
VIN = 15V, IO = 1A (LM2575, 3A for LM2576)
VIN = 12V, IO = 1A (LM2575, 3A for LM2576)
ADJ, VO = 5V
Switching Frequency
fSX
47
58
62
kHz
V
43
Saturation Voltage(1)
VSAT
LM2575, IO = 1A
LM2576, IO = 3A
0.9
0.9
98
1.2
1.4
Max. Duty Cycle (On)(3)
Peak Current LM2575(1)
DC
ICL
93
1.7
1.3
4.2
3.5
%
A
2.2
3.0
3.2
6.9
7.5
Peak Current LM2576(1)
ICL
5.8
A
ã 2001 Semtech Corp.
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