LM2594 Datasheet, PDF (1/25 Pages) National Semiconductor (TI) – SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator

LM2594
0.5 A, Step-Down Switching
Regulator
The LM2594 regulator is monolithic integrated circuit ideally suited
for easy and convenient design of a step−down switching regulator
(buck converter). It is capable of driving a 0.5 A load with excellent
line and load regulation. This device is available in adjustable output
version. It is internally compensated to minimize the number of
external components to simplify the power supply design.
Since LM2594 converter is a switch−mode power supply, its
efficiency is significantly higher in comparison with popular
three−terminal linear regulators, especially with higher input voltages.
The LM2594 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
8−Lead PDIP and 8−Lead Surface Mount packages.
The other features include a guaranteed $4% tolerance on output
voltage within specified input voltages and output load conditions, and
$15% on the oscillator frequency. External shutdown is included,
featuring 50 mA (typical) standby current. Self protection features
include switch cycle−by−cycle current limit for the output switch, as
well as thermal shutdown for complete protection under fault
conditions.
Features
• Adjustable Output Voltage Range 1.23 V − 37 V
• Guaranteed 0.5 A Output Load Current
• Wide Input Voltage Range up to 40 V
• 150 kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability
• Low Power Standby Mode, typ 50 mA
• Thermal Shutdown and Current Limit Protection
• Internal Loop Compensation
• Moisture Sensitivity Level (MSL) Equals 1
• These are Pb−Free Devices
Applications
• Simple High−Efficiency Step−Down (Buck) Regulator
• Efficient Pre−Regulator for Linear Regulators
• On−Card Switching Regulators
• Positive to Negative Converter (Buck−Boost)
• Negative Step−Up Converters
• Power Supply for Battery Chargers
http://onsemi.com
8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
LM2594
AYWW
G
1
PDIP−8
N SUFFIX
CASE 626
2594−ADJ
AWL
YYWW
A
WL
YY
WW
G or G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
SOIC−8
NC 1
NC 2
NC 3
FB 4
8 OUTPUT
7 V_IN
6 GND
5 ON/OFF
(Top View)
PDIP−8
NC ₁
NC ₂
NC ₃
FB ₄
8 OUTPUT
7 _VIN
6 _GND
5 _ON/OFF
(Top View)
© Semiconductor Components Industries, LLC, 2009
January, 2009 − Rev. 0
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 23 of this data sheet.
1
Publication Order Number:
LM2594/D