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LM2576-12WU

Description
7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5
CategoryPower/power management    The power supply circuit   
File Size54KB,9 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Environmental Compliance
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LM2576-12WU Overview

7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5

LM2576-12WU Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
package instruction,
Reach Compliance Codecompli
ECCN codeEAR99
Factory Lead Time7 weeks
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
Maximum input voltage40 V
Minimum input voltage4 V
Nominal input voltage12 V
JESD-30 codeR-PSSO-G5
JESD-609 codee3
length10.287 mm
Humidity sensitivity level1
Number of functions1
Number of terminals5
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current7.5 A
Nominal output voltage12 V
Package body materialPLASTIC/EPOXY
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)245
Certification statusNot Qualified
Maximum seat height4.59 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency63 kHz
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn) - annealed
Terminal formGULL WING
Terminal pitch1.7 mm
Terminal locationSINGLE
Maximum time at peak reflow temperature40
width9.144 mm
Base Number Matches1
LM2576
Micrel, Inc.
LM2576
52kHz Simple 3A Buck Regulator
General Description
The LM2576 series of monolithic integrated circuits provide
all the active functions for a step-down (buck) switching
regulator. Fixed versions are available with a 3.3V, 5V, or 12V
fixed output. Adjustable versions have an output voltage
range from 1.23V to 37V. Both versions are capable of driving
a 3A load with excellent line and load regulation.
These regulators are simple to use because they require a
minimum number of external components and include internal
frequency compensation and a fixed-frequency oscillator.
The LM2576 series offers a high efficiency replacement for
popular three-terminal adjustable linear regulators. It
substantially reduces the size of the heat sink, and in many
cases no heat sink is required.
A standard series of inductors available from several different
manufacturers are ideal for use with the LM2576 series. This
feature greatly simplifies the design of switch-mode power
supplies.
The feedback voltage is guaranteed to
±2%
tolerance for
adjustable versions, and the output voltage is guaranteed to
±3%
for fixed versions, within specified input voltages and
output load conditions. The oscillator frequency is guaranteed
to
±10%.
External shutdown is included, featuring less than
200µA standby current. The output switch includes cycle-by-
cycle current limiting and thermal shutdown for full protection
under fault conditions.
Features
• 3.3V, 5V, 12V, and adjustable output versions
• Voltage over specified line and load conditions:
Fixed version:
±3%
max. output voltage
Adjustable version:
±2%
max. feedback voltage
• Guaranteed 3A output current
• Wide input voltage range:
4V to 40V
• Wide output voltage range
1.23V to 37V
• Requires only 4 external components
• 52kHz fixed frequency internal oscillator
• Low power standby mode I
Q
typically < 200µA
• 80% efficiency (adjustable version typically > 80%)
• Uses readily available standard inductors
• Thermal shutdown and current limit protection
• 100% electrical thermal limit burn-in
Applications
Simple high-efficiency step-down (buck) regulator
Efficient pre-regulator for linear regulators
On-card switching regulators
Positive to negative converter (inverting Buck-Boost)
Isolated Flyback Converter using minimum number of
external components
• Negative Boost Converter
Typical Applications
7V–40V
Unregulated
DC Input
+V
IN
+
C
IN
100µF
LM2575-5.0 Output L1
2
330µH
3
5
Gnd On/Off
D1
1N5822
1
4
Feedback
+5V, 1A
Regulated
Output
+
C
OUT
330µF
7V–40V
Unregulated
DC Input
1
4
LM2575
Feedback
+V
IN
+
C
IN
100µF
3
5
Gnd On/Off
Output L1
2
330µH
D1
1N5822
+5V, 1A
Regulated
Output
+
C
OUT
330µF
R2 3.09k
R1 1k
Note: Pin numbers are for TO-220 Package
Note: Pin numbers are for TO-220 Package
V
OUT
= 1.23 1 + R2
R1
(
)
Fixed Regulator in Typical Application
Adjustable Regulator in Fixed Output Application
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2005
1
M9999-082605-B

LM2576-12WU Related Products

LM2576-12WU LM2576-12WT LM2576-3.3WU LM2576-5.0WU
Description 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5
Is it Rohs certified? conform to conform to conform to conform to
Reach Compliance Code compli compli compli compli
ECCN code EAR99 EAR99 EAR99 EAR99
Factory Lead Time 7 weeks 13 weeks 8 weeks 7 weeks
Analog Integrated Circuits - Other Types SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR
Maximum input voltage 40 V 40 V 40 V 40 V
Minimum input voltage 4 V 4 V 4 V 4 V
Nominal input voltage 12 V 12 V 12 V 12 V
JESD-30 code R-PSSO-G5 R-PSFM-T5 R-PSSO-G5 R-PSSO-G5
JESD-609 code e3 e3 e3 e3
Number of functions 1 1 1 1
Number of terminals 5 5 5 5
Maximum operating temperature 85 °C 85 °C 85 °C 125 °C
Minimum operating temperature -40 °C -40 °C -40 °C -40 °C
Maximum output current 7.5 A 7.5 A 7.5 A 7.5 A
Nominal output voltage 12 V 12 V 3.3 V 5 V
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE FLANGE MOUNT SMALL OUTLINE SMALL OUTLINE
Peak Reflow Temperature (Celsius) 245 NOT APPLICABLE 245 245
Certification status Not Qualified Not Qualified Not Qualified Not Qualified
surface mount YES NO YES YES
Switch configuration BUCK BUCK BUCK BUCK
Maximum switching frequency 63 kHz 63 kHz 63 kHz 63 kHz
Temperature level INDUSTRIAL INDUSTRIAL INDUSTRIAL AUTOMOTIVE
Terminal surface Matte Tin (Sn) - annealed Matte Tin (Sn) - annealed Matte Tin (Sn) - annealed Matte Tin (Sn) - annealed
Terminal form GULL WING THROUGH-HOLE GULL WING GULL WING
Terminal location SINGLE SINGLE SINGLE SINGLE
Maximum time at peak reflow temperature 40 NOT APPLICABLE 40 40
length 10.287 mm - 10.287 mm 10.363 mm
Humidity sensitivity level 1 - 1 1
Maximum seat height 4.59 mm - 4.59 mm 4.597 mm
Terminal pitch 1.7 mm - 1.7 mm 1.702 mm
width 9.144 mm - 9.144 mm 8.7805 mm
Base Number Matches 1 1 1 -
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