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LM2574_05

Description
1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8
CategoryPower/power management   
File Size186KB,8 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
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LM2574_05 Overview

1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8

LM2574
Micrel, Inc.
LM2574
52kHz Simple 0.5A Buck Regulator
General Description
The LM2574 family is a series of easy to use fixed and ad-
justable switching voltage regulators. The LM2574 contains
all of the active circuitry necessary to construct a stepdown
(buck) switching regulator and requires a minimum of external
components.
The LM2574 is available in 3.3V and 5V fixed output ver-
sions, or an adjustable version with an output voltage range
of 1.23V to 37V. Output voltage is guaranteed to ±4% for
specified input and load conditions.
The LM2574 can supply 0.5A while maintaining excellent
line and load regulation. The output switch includes cycle-
by-cycle current limiting, as well as thermal shutdown for full
protection under fault conditions.
An external shutdown connection selects operating or standby
modes. Standby current is less than 200µA.
Heat sinks are generally unnecessary due the regulator’s
high efficiency. Adequate heat transfer is usually provided
by soldering all package pins to a printed circuit board.
The LM2574 includes internal frequency compensation and
an internal 52kHz fixed frequency oscillator guaranteed to
±10% of the frequency.
Circuits constructed around the LM2574 use a standard
series of inductors which are available from several different
manufacturers.
All support documentation can be found on Micrel’s web site
at www.micrel.com.
Features
• 3.3V, 5V, 12V, and adjustable output versions
• Adjustable version output 1.23V to 37V ±4% max. over
line and load conditions.
• Guaranteed 0.5A output current
• Wide input voltage, up to 40V
• Thermal shutdown and current limit protection
• Requires only 4 external components.
• Shutdown capability (standby mode)
• Low power standby mode < 200µA Typical
• High-efficiency
• 52kHz fixed frequency internal oscillator
• Uses standard inductors
Applications
Simple high-efficiency step-down (buck) regulator
Efficient pre-regulator for linear regulators
On-card switching regulators
Positive to negative converter (buck-boost)
Typical Application
40V MAX
UNREGULATED
DC IN
C
IN
22µF
V
IN
LM2574
PWR
GND
FB
330µH
OUT
SIG ON/
GND OFF
REGULATED
OUTPUT
0.5A
C
OU T
220µF
11DQ05
Figure 1. Fixed Output Regulator Circuit
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2005
1
M9999-072805

LM2574_05 Related Products

LM2574_05 LM2574-3.3BN LM2574-5.0BN LM2574BN
Description 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8
Is it Rohs certified? - incompatible incompatible incompatible
Maker - Microchip Microchip Microchip
Parts packaging code - DIP DIP DIP
package instruction - DIP, DIP8,.3 DIP, DIP8,.3 DIP, DIP8,.3
Contacts - 8 8 8
Reach Compliance Code - _compli _compli _compli
ECCN code - EAR99 EAR99 EAR99
Analog Integrated Circuits - Other Types - SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR
control mode - VOLTAGE-MODE VOLTAGE-MODE VOLTAGE-MODE
Control Technology - PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage - 40 V 40 V 40 V
Minimum input voltage - 4.75 V 7 V 7 V
Nominal input voltage - 12 V 12 V 12 V
JESD-30 code - R-PDIP-T8 R-PDIP-T8 R-PDIP-T8
JESD-609 code - e0 e0 e0
length - 9.525 mm 9.525 mm 9.525 mm
Number of functions - 1 1 1
Number of terminals - 8 8 8
Maximum operating temperature - 85 °C 85 °C 85 °C
Minimum operating temperature - -40 °C -40 °C -40 °C
Maximum output current - 1.8 A 1.8 A 1.8 A
Nominal output voltage - 3.3 V 5 V 1.23 V
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - DIP DIP DIP
Encapsulate equivalent code - DIP8,.3 DIP8,.3 DIP8,.3
Package shape - RECTANGULAR RECTANGULAR RECTANGULAR
Package form - IN-LINE IN-LINE IN-LINE
Peak Reflow Temperature (Celsius) - 240 240 240
Certification status - Not Qualified Not Qualified Not Qualified
Maximum supply current (Isup) - 10 mA 10 mA 10 mA
surface mount - NO NO NO
Switch configuration - BUCK BUCK BUCK
Maximum switching frequency - 63 kHz 63 kHz 63 kHz
technology - BIPOLAR BIPOLAR BIPOLAR
Temperature level - INDUSTRIAL INDUSTRIAL INDUSTRIAL
Terminal surface - Tin/Lead (Sn85Pb15) Tin/Lead (Sn85Pb15) Tin/Lead (Sn85Pb15)
Terminal form - THROUGH-HOLE THROUGH-HOLE THROUGH-HOLE
Terminal pitch - 2.54 mm 2.54 mm 2.54 mm
Terminal location - DUAL DUAL DUAL
Maximum time at peak reflow temperature - 30 30 30
width - 7.62 mm 7.62 mm 7.62 mm
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