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SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator, with Features
LM2597/LM2597HV
SIMPLE SWITCHER® Power Converter 150 kHz 0.5A
Step-Down Voltage Regulator, with Features
General DescriptionThe LM2597/LM2597HV seriesof regulators are monolithic
integrated circuits that provideallthe active functionsfora
step-down (buck) switching regulator, capableof drivinga
0.5A load with excellent line and load regulation. These
devices are availablein fixed output voltagesof 3.3V, 5V,
12V, andan adjustable output version, and are packagedin 8-lead DIP andan 8-lead surface mount package.
This seriesof switching regulatorsis similartothe LM2594
series, with additional supervisory and performance features
added.
Requiringa minimum numberof external components, these
regulators are simpleto use and include internal frequency
compensation†, improved line and load specifications,
fixed-frequency oscillator, Shutdown /Soft-start, error flag
delay and error flag output.
The LM2597/LM2597HV series operatesata switching fre-
quencyof 150 kHz thus allowing smaller sized filter compo-
nents than what wouldbe needed with lower frequency
switching regulators. Becauseofits high efficiency,the cop-
per tracesonthe printed circuit board are normally the only
heat sinking needed. standard seriesof inductors (both through hole and sur-
face mount types) are available from several different manu-
facturers optimizedfor use withthe LM2597/LM2597HV se-
ries. This feature greatly simplifies the design of
switch-mode power supplies.
Other features includea guaranteed ±4% toleranceon out-
put voltage underall conditionsof input voltage and output
load conditions, and ±15%on the oscillator frequency. Ex-
ternal shutdownis included, featuring typically 85μA
standby current. Self protection features includea two stage
current limitfor the output switch andan over temperature
shutdownfor complete protection under fault conditions.
The LM2597HVisfor usein applications requiring and input
voltageupto 60V.
Features 3.3V, 5V, 12V, and adjustable output versions Adjustable version output voltage range, 1.2Vto 37V
(57Vfor HV version)±4% max over line and load
conditions Guaranteed 0.5A output current Availablein 8-pin surface mount and DIP-8 package Input voltage rangeupto 60V 150 kHz fixed frequency internal oscillator Shutdown /Soft-start Outof regulation error flag Error output delay Bias Supply Pin (VBS)for internal circuitry improves
efficiencyat high input voltages Low power standby mode,IQ typically85μA High Efficiency Uses readily available standard inductors Thermal shutdown and current limit protection
Applications Simple high-efficiency step-down (buck) regulator Efficient pre-regulatorfor linear regulators On-card switching regulators Positiveto Negative converter
Typical Application (Fixed Output Voltage Versions)
DS012440-1
†Patent Number 5,382,918.
December 2000
LM2597/LM2597HV
SIMPLE
SWITCHER
Power
Converter
kHz
0.5A
Step-Down
oltage
Regulator
with
Features
