1 Features
1• 3.3-V, 5-V, and Adjustable Output Versions
• Adjustable Version Output Voltage Range: 1.2 V
to 57 V ±4% Maximum Over Line and Load
Conditions
• Ensured 2-A Output Load Current
• Available in 7-Pin TO-220 and TO-263 (Surface-
Mount) Package
• Input Voltage Range up to 60 V
• 150-kHz Fixed Frequency Internal Oscillator
• Shutdown and Soft-Start
• Out-of-Regulation Error Flag
• Error Flag Delay
• Low Power Standby Mode: IQ, Typically 90 μA
• High Efficiency
• Thermal Shutdown and Current-Limit Protection

2 Applications
• Simple High-Efficiency Step-Down (Buck)
Regulators
• Efficient Preregulator for Linear Regulators
• On-Card Switching Regulators
• Positive-to-Negative Converters

3 Description
The LM2593HV series of regulators are monolithic
integrated circuits that provide all the active functions
for a step-down (buck) switching regulator, capable of
driving a 2-A load with excellent line and load
regulation. These devices are available in fixed output
voltages of 3.3-V, 5-V, and an adjustable output
version.
This series of switching regulators is similar to the
LM2592HV with additional supervisory and
performance features.
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, output error flag, and flag delay.
The LM2593HV operates at a switching frequency of
150 kHz, thus allowing smaller sized filter
components than what would be needed with lower
frequency switching regulators. Available in a
standard 7-pin TO-220 package with several different
lead bend options, and a 7-pin TO-263 surface-mount
package.
Other features include a specified ±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 90-μA standby current. Selfprotection
features include a two stage current limit
for the output switch and an overtemperature
shutdown for complete protection under fault
conditions.