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Micrel Semiconductor - 52kHz Simple 1A Buck Regulator

Numéro de référence LM2575
Description 52kHz Simple 1A Buck Regulator
Fabricant Micrel Semiconductor 
Logo Micrel Semiconductor 





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LM2575 fiche technique
LM2575
52kHz Simple 1A Buck Regulator
General Description
Features
The LM2575 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, 12V, fixed output. Adjustable versions have an
output voltage range from 1.23V to 37V. Both versions are
capable of driving a 1A 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 LM2575 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 LM2575
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.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
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 1A 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
7V–40V
Unregulated
DC Input 1
4
Feedback
+5V, 1A
Regulated
+VIN LM2575-5.0 Output L1
Output
+
CIN
100µF
35
Gnd On/Off
2
330µH
D1
1N5822
+
COUT
330µF
7V–40V
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
Fixed Regulation in Typical Application
Note: Pin numbers are for TO-220 Package
( )VOUT = 1.23
1+
R2
R1
Adjustable Regulation 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
May 2009
1 M9999-051209-B

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