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LM2574MX-3.3/NOPB Datenblatt(PDF) 1 Page - Texas Instruments

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Teilenummer LM2574MX-3.3/NOPB
Bauteilbeschribung  SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM2574MX-3.3/NOPB Datenblatt(HTML) 1 Page - Texas Instruments

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM2574, LM2574HV
SNVS104D – JUNE 1999 – REVISED APRIL 2016
LM2574x SIMPLE SWITCHER® 0.5-A Step-Down Voltage Regulator
1
1 Features
1
3.3-V, 5-V, 12-V, 15-V, and Adjustable Output
Versions
Adjustable Version Output Voltage Range: 1.23 V
to 37 V (57 V for HV version) ±4% Maximum Over
Line and Load Conditions
Specified 0.5-A Output Current
Wide Input Voltage Range: 40 V, up to 60 V for
HV Version
Requires Only 4 External Components
52-kHz Fixed-Frequency Internal Oscillator
TTL Shutdown Capability, Low-Power Standby
Mode
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current-Limit Protection
2 Applications
Simple High-Efficiency Step-Down (Buck)
Regulator
Efficient Preregulator for Linear Regulators
On-Card Switching Regulators
Positive-to-Negative Converter (Buck-Boost)
3 Description
The LM2574xx series of regulators are monolithic
integrated circuits that provide all the active functions
for a step-down (buck) switching regulator, capable of
driving a 0.5-A load with excellent line and load
regulation. These devices are available in fixed output
voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable
output version.
Requiring
a
minimum
number
of
external
components, these regulators are simple to use and
include internal frequency compensation and a fixed-
frequency oscillator.
The
LM2574xx
series
offers
a
high-efficiency
replacement
for
popular
three-terminal
linear
regulators. Because of its high efficiency, the copper
traces on the printed-circuit board (PCB) are normally
the only heat sinking needed.
A standard series of inductors optimized for use with
the LM2574 are available from several different
manufacturers. This feature greatly simplifies the
design of switch-mode power supplies.
Other features include a specified ±4% tolerance on
output voltage within specified input voltages and
output load conditions, and ±10% on the oscillator
frequency. External shutdown is included, featuring
50-
μA (typical) standby current. The output switch
includes cycle-by-cycle current limiting, as well as
thermal shutdown for full protection under fault
conditions.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2574, LM2574HV
SOIC (14)
8.992 mm × 7.498 mm
PDIP (8)
6.35 mm × 9.81 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application (Fixed Output Voltage Versions)


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