Switching Regulators. LM2576 Datasheet

LM2576 Regulators. Datasheet pdf. Equivalent


Semtech Corporation LM2576
POWER MANAGEMENT
Description
Features
LM2575 & LM2576
1A & 3A Miniconverter
Switching Regulators
The LM2575/6 series switching regulators are monolithic
integrated circuits designed for use in “buck” or “buck/
boost” regulator applications requiring accurate output
voltages over combined variations of line, load and
temperature. This unique series greatly simplifies
switching power supply design. The LM2575 has a
maximum output current of 1A and the LM2576 is rated
for 3A.
The LM2575/6 series miniconverters include a
switching regulator and compensation network all within
the same package. Just add a choke, catch diode and
two capacitors to obtain an efficient DC-to-DC converter.
The current limit and thermal shutdown features of the
LM2575/6 series fully protect the device against
overstress conditions.
The LM2575/6 series offers an alternative to popular 3
terminal linear regulators by providing higher efficiency
with reduced heatsink size. In many applications a heat
sink will not be required.
u Pin for pin replacement for National’s LM2575/6
series
u DC-to-DC buck or buck/boost converter requiring
only 4 support components
u Fixed or adjustable voltages
u Preset output voltages of 3.3V, 5V and 12V
u Wide output voltage range, 1.23V to 35V
u 82% typical efficiency @ 5V out
u Wide input voltage range, 4V to 40V
u Inhibit/enable control pin
u Industrial temperature range
u TO-220 and TO-263 packages
Applications
u Micro controller power supplies
u Medical equipment
u Industrial power supplies
u Instrumentation power supplies
Typical Application Circuits
Revision 1, January 2001
LM2575 LM2576
L1
D1
CIN
COUT
330µH
3A
68µF
330µF
100µH
7A
120µF
1,000µF
1 www.semtech.com


LM2576 Datasheet
Recommendation LM2576 Datasheet
Part LM2576
Description 1A & 3A Miniconverter Switching Regulators
Feature LM2576; POWER MANAGEMENT Description The LM2575/6 series switching regulators are monolithic integrated circ.
Manufacture Semtech Corporation
Datasheet
Download LM2576 Datasheet




Semtech Corporation LM2576
LM2575 & LM2576
POWER MANAGEMENT
Absolute Maximum Ratings
Parameter
Symbol
Maximum
Units
Input Voltage
On/Off Pin Input Voltage
Output Voltage to Common (Steady State)
VIN
VON/OFF
45
-0.3 £ VON/OFF £ VIN
-1
V
V
V
Power Dissipation
Thermal Resistance Junction to Ambient
TO-220
TO-263
PD Internally Limited W
qJA 55 °C/W
60
Thermal Resistance Junction to Case
TO-220
TO-263
qJC 2.0 °C/W
2.0
Operating Junction Temperature Range
TJ -40 to +125 °C
Storage Temperature Range
TSTG -65 to +150
°C
Lead Temperature (Soldering) 10 Sec.
TLEAD
300
°C
ESD Rating (Human Body Model)
VESD
2
kV
Electrical Characteristics
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
Min Typ Max Units
Output Voltage
LM2576-3.3
VO
IO = 0.5A
3.23 3.30 3.37 V
8V to VIN Rated
3.20 3.40
3.14 3.47
Output Voltage
LM2576-5
VO
IO = 0.5A
4.90 5.00 5.10 V
8V to VIN Rated
4.85 5.15
4.75 5.25
Output Voltage
LM2576-12
VO
IO = 0.5A
11.76 12.00 12.24 V
15V to VIN Rated
11.52
12.48
11.40
12.60
Feedback Voltage
LM2576-ADJ, VO = 5V
VFB
IO = 0.5A
8V to VIN Rated
1.217 1.230 1.243
1.193
1.267
1.180
1.280
V
Feedback Bias Current
LM2576-ADJ
IB
VIN = 12V, IO = 0.5A
50 100 nA
500
ã 2001 Semtech Corp.
2
www.semtech.com



Semtech Corporation LM2576
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
Min Typ Max Units
Output Voltage
LM2575-3.3
VO
IO = 0.2A
8V to VIN Rated
3.23 3.30 3.37
3.20 3.40
3.14 3.47
V
Output Voltage
LM2575-5
VO
IO = 0.2A
8V to VIN Rated
4.90 5.00 5.10
4.85 5.15
4.75 5.25
V
Output Voltage
LM2575-12
VO
IO = 0.2A
15V to VIN Rated
11.76 12.00 12.24
11.52
12.48
11.40
12.60
V
Feedback Voltage
LM2575-ADJ, VO = 5V
VFB
IO = 0.2A
8V to VIN Rated
1.217 1.230 1.243
1.193
1.267
1.180
1.280
V
Feedback Bias Current
LM2575-ADJ
IB
VIN = 12V, IO = 0.2A
50 100 nA
500
Efficiency/Option
3.3V
5V
h VIN = 12V, IO = 1A (LM2575, 3A for LM2576)
77
82
%
12V
ADJ, VO = 5V
Switching Frequency
VIN = 15V, IO = 1A (LM2575, 3A for LM2576)
88
VIN = 12V, IO = 1A (LM2575, 3A for LM2576)
82
fSX 47 52 58 kHz
43 62
Saturation Voltage(1)
Max. Duty Cycle (On)(3)
VSAT
DC
LM2575, IO = 1A
LM2576, IO = 3A
0.9 1.2 V
0.9 1.4
93 98
%
Peak Current LM2575(1)
ICL
1.7 2.2 3.0
1.3 3.2
A
Peak Current LM2576(1)
ICL
4.2 5.8 6.9
3.5 7.5
A
ã 2001 Semtech Corp.
3
www.semtech.com







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)