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LM2574-5.0YN

Description
Conv DC-DC 4V to 40V Step Down Single-Out 5V 0.5A 8-Pin PDIP Tube
File Size181KB,8 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Environmental Compliance
Related ProductsFound20parts with similar functions to LM2574-5.0YN
Download Datasheet Parametric Compare View All

LM2574-5.0YN Overview

Conv DC-DC 4V to 40V Step Down Single-Out 5V 0.5A 8-Pin PDIP Tube

LM2574-5.0YN Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeStep Down
Output TypeFixed
Switching Frequency (kHz)58
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)5
Maximum Output Current (A)0.5
Minimum Input Voltage (V)4
Maximum Input Voltage (V)40
Operating Supply Voltage (V)40(Max)
Typical Quiescent Current (uA)5000
Efficiency (%)78(Typ)
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
PackagingTube
Supplier PackagePDIP
Pin Count8
Standard Package NameDIP
MountingThrough Hole
Package Height3.81(Max)
Package Length9.53
Package Width6.35
PCB changed8
Lead ShapeThrough Hole
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

LM2574-5.0YN Related Products

LM2574-5.0YN LM2574YN LM2574-12YN LM2574-3.3YN
Description 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 1.23V to 37V 0.5A 8-Pin PDIP Tube 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 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 Fixed Adjustable - Fixed
Switching Frequency (kHz) 58 58 - 58
Switching Regulator Yes Yes - Yes
Number of Outputs 1 1 - 1
Output Voltage (V) 5 1.23 to 37 - 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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