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LM2574-12YN

Description
Conv DC-DC 4V to 40V Step Down Single-Out 12V 0.5A 8-Pin PDIP Tube
CategoryPower/power management    The power supply circuit   
File Size181KB,8 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
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LM2574-12YN Overview

Conv DC-DC 4V to 40V Step Down Single-Out 12V 0.5A 8-Pin PDIP Tube

LM2574-12YN Parametric

Parameter NameAttribute value
MakerMicrochip
package instructionDIP,
Reach Compliance Codecompliant
Factory Lead Time14 weeks
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
Maximum input voltage40 V
Nominal input voltage12 V
JESD-30 codeR-PDIP-T8
length9.525 mm
Number of functions1
Number of terminals8
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current1.8 A
Nominal output voltage12 V
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Package shapeRECTANGULAR
Package formIN-LINE
surface mountNO
Switch configurationBUCK
Temperature levelINDUSTRIAL
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
width7.62 mm
Base Number Matches1
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

LM2574-12YN Related Products

LM2574-12YN LM2574YN LM2574-5.0YN LM2574-3.3YN
Description Conv DC-DC 4V to 40V Step Down Single-Out 12V 0.5A 8-Pin PDIP Tube Conv DC-DC 4V to 40V Step Down Single-Out 1.23V to 37V 0.5A 8-Pin PDIP Tube Conv DC-DC 4V to 40V Step Down Single-Out 5V 0.5A 8-Pin PDIP Tube Conv DC-DC 4V to 40V Step Down Single-Out 3.3V 0.5A 8-Pin PDIP Tube
EU restricts the use of certain hazardous substances - Compliant Compliant Compliant
ECCN (US) - EAR99 EAR99 EAR99
Part Status - Active Active Active
HTS - 8542.39.00.01 8542.39.00.01 8542.39.00.01
Type - Step Down Step Down Step Down
Output Type - Adjustable Fixed Fixed
Switching Frequency (kHz) - 58 58 58
Switching Regulator - Yes Yes Yes
Number of Outputs - 1 1 1
Output Voltage (V) - 1.23 to 37 5 3.3
Maximum Output Current (A) - 0.5 0.5 0.5
Minimum Input Voltage (V) - 4 4 4
Maximum Input Voltage (V) - 40 40 40
Operating Supply Voltage (V) - 40(Max) 40(Max) 40(Max)
Typical Quiescent Current (uA) - 5000 5000 5000
Efficiency (%) - 78(Typ) 78(Typ) 73(Typ)
Minimum Operating Temperature (°C) - -40 -40 -40
Maximum Operating Temperature (°C) - 85 85 85
Packaging - Tube Tube Tube
Supplier Package - PDIP PDIP PDIP
Pin Count - 8 8 8
Standard Package Name - DIP DIP DIP
Mounting - Through Hole Through Hole Through Hole
Package Height - 3.81(Max) 3.81(Max) 3.81(Max)
Package Length - 9.53 9.53 9.53
Package Width - 6.35 6.35 6.35
PCB changed - 8 8 8
Lead Shape - Through Hole Through Hole Through Hole
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