LM2598 Datasheet, PDF (1/47 Pages) National Semiconductor (TI) – SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator, with Features

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LM2598
SNVS125D – MARCH 1998 – REVISED MAY 2016
LM2598 SIMPLE SWITCHER^® Power Converter 150-kHz 1-A Step-Down Voltage Regulator,
With Features
1 Features
•1 3.3-V, 5-V, 12-V, and Adjustable Output Versions
• Adjustable Version Output Voltage Range, 1.2-V
to 37-V ±4% Max Over Line and Load Conditions
• 1-A Output Current
• Available in 7-Pin TO-220 and DDPAK (Surface
Mount) Package
• Input Voltage Range Up to 40 V
• Excellent Line and Load Regulation Specifications
• 150 kHz Fixed Frequency Internal Oscillator
• Shutdown/Soft-start
• Out of Regulation Error Flag
• Error Output Delay
• Low Power Standby Mode, I_Q, Typically 85 μA
• 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
3 Description
The LM2598 series of regulators are monolithic
integrated circuits that provide all the active functions
for a step-down (buck) switching regulator, capable of
driving a 1-A load with excellent line and load
regulation. These devices are available in fixed output
voltages of 3.3 V, 5 V, 12 V, and an adjustable output
version.
The LM2598 is a member of the LM259x family.
Requiring a minimum number of external
components, these regulators are simple to use and
include internal frequency compensation, improved
line and load specifications, fixed-frequency oscillator,
Shutdown/Soft-start, error flag delay and error flag
output.
The LM2598 series operates at a switching frequency
of 150 kHz, thus allowing smaller sized filter
components than what would be required with lower-
frequency switching regulators. Available in a
standard 7-lead TO-220 package with several
different lead bend options, and a 7-lead DDPAK
surface mount package. Typically, for output voltages
less than 12 V, and ambient temperatures less than
50°C, no heat sink is required.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2598
TO-220 (7)
TO-263 (7)
14.986 mm × 10.16 mm
10.10 mm × 8.89 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
Fixed output voltage versions
1
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.