SNVS118C – DECEMBER 1999 – REVISED APRIL 2013
LM2594/LM2594HV SIMPLE SWITCHER
®
Power Converter 150 kHz 0.5A Step-Down
Voltage Regulator
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FEATURES
DESCRIPTION
The LM2594/LM2594HV series of regulators are
monolithic integrated circuits that provide all the
active functions for a step-down (buck) switching
regulator, capable of driving a 0.5A load with
excellent line and load regulation. These devices are
available in fixed output voltages of 3.3V, 5V, 12V,
and an adjustable output version, and are packaged
in a 8-lead PDIP and a 8-lead surface mount SOIC
package.
Requiring a minimum number of external
components, these regulators are simple to use and
feature internal frequency compensation†, a fixed-
frequency oscillator, and improved line and load
regulation specifications.
The LM2594/LM2594HV series operates at a
switching frequency of 150 kHz thus allowing smaller
sized filter components than what would be needed
with lower frequency switching regulators. Because of
its high efficiency, the copper traces on the printed
circuit board are normally the only heat sinking
needed.
A standard series of inductors (both through hole and
surface mount types) are available from several
different manufacturers optimized for use with the
LM2594/LM2594HV series. This feature greatly
simplifies the design of switch-mode power supplies.
Other features include an ensured ±4% tolerance on
output voltage under all conditions of input voltage
and output load conditions, and ±15% on the
oscillator frequency. External shutdown is included,
featuring typically 85
μA
standby current. Self
protection features include a two stage frequency
reducing current limit for the output switch and an
over temperature shutdown for complete protection
under fault conditions.
The LM2594HV is for applications requiring an input
voltage up to 60V.
• 3.3V, 5V, 12V, and Adjustable Output Versions
• Adjustable Version Output Voltage Range,
1.2V to 37V (57V for the HV Version)±4% Max
Over Line and Load Conditions
• Available in 8-pin Surface Mount SOIC and
PDIP-8 Package
• Ensured 0.5A Output Current
• Input Voltage Range up to 60V
• Requires only 4 External Components
• 150 kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability
• Low Power Standby Mode, I
Q
typically 85
μA
• High Efficiency
• Uses Readily Available Standard Inductors
• Thermal Shutdown and Current Limit
Protection
2345
APPLICATIONS
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•
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Simple High-efficiency Step-down (Buck)
Regulator
Efficient Pre-regulator for Linear Regulators
On-card Switching Regulators
Positive to Negative Convertor
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Switchers Made Simple
is a trademark of Texas Instruments.
SIMPLE SWITCHER is a registered trademark of Texas Instruments.
Switchers Made Simple is a registered trademark of dcl_owner.
All other trademarks are the property of their respective owners.
Copyright © 1999–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TI [ TEXAS INSTRUMENTS ]
