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LM2576-3.3WT

Description
Switching Voltage Regulators 3A Step-Down SMPS Regulator
CategoryPower/power management    The power supply circuit   
File Size56KB,10 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Environmental Compliance
Download Datasheet Parametric View All

LM2576-3.3WT Overview

Switching Voltage Regulators 3A Step-Down SMPS Regulator

LM2576-3.3WT Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
package instruction,
Reach Compliance Codecompliant
ECCN codeEAR99
Factory Lead Time6 weeks
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
Maximum input voltage40 V
Minimum input voltage4 V
Nominal input voltage12 V
JESD-30 codeR-PSFM-T5
JESD-609 codee3
Number of functions1
Number of terminals5
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current7.5 A
Nominal output voltage3.3 V
Package body materialPLASTIC/EPOXY
Package shapeRECTANGULAR
Package formFLANGE MOUNT
Peak Reflow Temperature (Celsius)NOT APPLICABLE
Certification statusNot Qualified
surface mountNO
Switch configurationBUCK
Maximum switching frequency63 kHz
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn) - annealed
Terminal formTHROUGH-HOLE
Terminal locationSINGLE
Maximum time at peak reflow temperatureNOT APPLICABLE
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
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