1 Features
1• 3.3-V, 5-V, and Adjustable Output Versions
• Adjustable Version Output Voltage Range, 1.2 V
to 57 V ±4% Max Over Line and Load Conditions
• Ensured 1-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: 90 μA (Typical)
• 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 LM2590HV 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, and an adjustable output
version.
This series of switching regulators is similar to the
LM2591HV with additional supervisory and control
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 LM2590HV 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 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 90-μA standby current (typical). Self
protection features include a two stage current limit
for the output switch and an over temperature
shutdown for complete protection under fault
conditions.