Voltage Regulator. LM2594HV Datasheet


LM2594HV Regulator. Datasheet pdf. Equivalent


Part Number

LM2594HV

Description

SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator

Manufacture

National Semiconductor

Total Page 28 Pages
Datasheet
Download LM2594HV Datasheet


LM2594HV
December 1999
LM2594/LM2594HV
SIMPLE SWITCHER® Power Converter 150 kHz 0.5A
Step-Down Voltage Regulator
General 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 de-
vices are available in fixed output voltages of 3.3V, 5V, 12V,
and an adjustable output version, and are packaged in a
8-lead DIP and a 8-lead surface mount 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 fre-
quency of 150 kHz thus allowing smaller sized filter compo-
nents than what would be needed with lower frequency
switching regulators. Because of its high efficiency, the cop-
per traces on the printed circuit board are normally the only
heat sinking needed.
A standard series of inductors (both through hole and sur-
face mount types) are available from several different manu-
facturers optimized for use with the LM2594/LM2594HV se-
ries. This feature greatly simplifies the design of
switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on out-
put voltage under all conditions of input voltage and output
load conditions, and ±15% on the oscillator frequency. Ex-
ternal 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.
Features
n 3.3V, 5V, 12V, and adjustable output versions
n Adjustable version output voltage range, 1.2V to 37V
(57V for the HV version)±4% max over line and load
conditions
n Available in 8-pin surface mount and DIP-8 package
n Guaranteed 0.5A output current
n Input voltage range up to 60V
n Requires only 4 external components
n 150 kHz fixed frequency internal oscillator
n TTL Shutdown capability
n Low power standby mode, IQ typically 85 µA
n High Efficiency
n Uses readily available standard inductors
n Thermal shutdown and current limit protection
Applications
n Simple high-efficiency step-down (buck) regulator
n Efficient pre-regulator for linear regulators
n On-card switching regulators
n Positive to Negative convertor
Typical Application (Fixed Output Voltage Versions)
DS012439-1
SIMPLE SWITCHER and Switchers Made Simpleare registered trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS012439
www.national.com

LM2594HV
Connection Diagrams and Order Information
8-Lead DIP (N)
8-Lead Surface Mount (M)
DS012439-2
Top View
Order Number
LM2594N-3.3, LM2594N-5.0,
LM2594N-12 or LM2594N-ADJ
LM2594HVN-3.3, LM2594HVN-5.0,
LM2594HVN-12 or LM2594HVN-ADJ
See NS Package Number N08E
DS012439-3
Top View
Order Number LM2594M-3.3,
LM2594M-5.0, LM2594M-12 or
LM2594M-ADJ
LM2594HVM-3.3, LM2594HVM-5.0,
LM2594HVM-12 or LM2594HVM-ADJ
See NS Package Number M08A
*No internal connection, but should be soldered to pc board for best heat transfer.
Patent Number 5,382,918.
www.national.com
2


Features LM2594/LM2594HV SIMPLE SWITCHER Power Co nverter 150 kHz 0.5A Step-Down Voltage Regulator December 1999 LM2594/LM2594 HV SIMPLE SWITCHER® Power Converter 15 0 kHz 0.5A Step-Down Voltage Regulator General Description The LM2594/LM2594H V series of regulators are monolithic i ntegrated circuits that provide all the active functions for a step-down (buck ) switching regulator, capable of drivi ng a 0.5A load with excellent line and load regulation. These devices are avai lable in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output vers ion, and are packaged in a 8-lead DIP a nd a 8-lead surface mount package. Requ iring a minimum number of external comp onents, these regulators are simple to use and feature internal frequency comp ensation†, a fixed-frequency oscillat or, and improved line and load regulati on specifications. The LM2594/LM2594HV series operates at a switching frequenc y of 150 kHz thus allowing smaller size d filter components than what would be needed with lower frequency.
Keywords LM2594HV, datasheet, pdf, National Semiconductor, SIMPLE, SWITCHER, Power, Converter, 150, kHz, 0.5A, Step-Down, Voltage, Regulator, M2594HV, 2594HV, 594HV, LM2594H, LM2594, LM259, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)