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Micrel Semiconductor

LM2576 Datasheet Preview

LM2576 Datasheet

52kHz Simple 3A Buck Voltage Regulator

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LM2576
LM2576
Micrel, Inc.
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 IQ 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
7V40V
Unregulated
DC Input 1
4 Feedback
+VIN LM2575-5.0 Output L1
+5V, 1A
Regulated
Output
+
CIN
100µF
3 52
Gnd On/Off
330µH
D1
1N5822
+
COUT
330µF
Note: Pin numbers are for TO-220 Package
Fixed Regulator in Typical Application
7V40V
Unregulated
DC Input
1
+VIN
LM2575
+
CIN
100µF
35
Gnd On/Off
4 Feedback
Output L1
2 330µH
D1
1N5822
+
COUT
330µF
+5V, 1A
Regulated
Output
R2 3.09k
R1 1k
Note: Pin numbers are for TO-220 Package
( )VOUT = 1.23
1
+
R2
R1
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




Micrel Semiconductor

LM2576 Datasheet Preview

LM2576 Datasheet

52kHz Simple 3A Buck Voltage Regulator

No Preview Available !

LM2576
Micrel, Inc.
Ordering Information
Part Number
Standard
RoHS Compliant**
LM2576BT*
LM2576WT*
LM2576-3.3BTLM2576-3.3WT
LM2576-5.0BTLM2576-5.0WT
LM2576-12BTLM2576-12WT
LM2576BU*
LM2576WU*
LM2576-3.3BU LM2576-3.3WU
LM2576-5.0BU LM2576-5.0WU
LM2576-12BU LM2576-12WU
Range
40°C to +85°C
40°C to +85°C
40°C to +85°C
40°C to +85°C
40°C to +85°C
40°C to +85°C
40°C to +85°C
40°C to +85°C
* Adjustable output regulators.
**RoHS compliant with "hot-melting solder" exemption.
Contact factory for bent or staggered leads option.
Temperature
Package
TO-220-5
TO-220-5
TO-220-5
TO-220-5
TO-263-5
TO-263-5
TO-263-5
TO-263-5
Pin Configurations
5-LEAD TO-220 (T)
GND
5- ON/OFF
4- FEEDBACK
3- GROUND
2- OUTPUT
1- VIN
5-LEAD TO-263 (U)
GND
5- ON/OFF
4- FEEDBACK
3- GROUND
2- OUTPUT
1- VIN
M9999-082605-B
2
August 2005


Part Number LM2576
Description 52kHz Simple 3A Buck Voltage Regulator
Maker Micrel Semiconductor
PDF Download

LM2576 Datasheet PDF






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