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LM2575-12BT 데이터시트(HTML) 1 Page - Micrel Semiconductor

부품명 LM2575-12BT
상세내용  52kHz Simple 1A Buck Regulator
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제조사  MICREL [Micrel Semiconductor]
홈페이지  http://www.micrel.com
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LM2575-12BT 데이터시트(HTML) 1 Page - Micrel Semiconductor

 
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LM2575
52kHz Simple 1A Buck Regulator
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
General Description
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.
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 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
LM2575-5.0
+
CIN
100µF
+VIN
1
3
Gnd
5
On/Off
2
Output
4
Feedback
L1
330µH
+
D1
1N5822
COUT
330µF
+5V, 1A
Regulated
Output
Note: Pin numbers are for TO-220 Package
R2
R1
7V–40V
Unregulated
DC Input
LM2575
+
CIN
100µF
+VIN
1
3
Gnd
5
On/Off
2
Output
4
Feedback
L1
330µH
+
D1
1N5822
COUT
330µF
R2 3.09k
R1 1k
VOUT = 1.23 1 +
()
+5V, 1A
Regulated
Output
Note: Pin numbers are for TO-220 Package
Fixed Regulation in Typical Application
Adjustable Regulation in Fixed Output Application


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