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SIMPLE SWITCHER Power Converter 150 KHz 3A Step-Down Voltage Regulator with Features
LM2599
SIMPLE SWITCHER® Power Converter 150 kHz 3A
Step-Down Voltage Regulator, with Features
General DescriptionThe LM2599 seriesof regulators are monolithic integrated
circuits that provideallthe active functionsfora step-down
(buck) switching regulator, capableof drivinga3A load with
excellent line and load regulation. These devices are avail-
ablein fixed output voltagesof 3.3V,5V, 12V, andan adjust-
able output version.
This seriesof switching regulatorsis similartothe LM2596
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 de-
lay and error flag output.
The LM2599 series operatesata switching frequencyof 150
kHz thus allowing smaller sized filter components than what
wouldbe needed with lower frequency switching regulators.
Availableina standard 7-lead TO-220 package with several
different lead bend options, anda 7-lead TO-263 Surface
mount package. standard seriesof inductors (both through hole and sur-
face mount types) are available from several different manu-
facturers optimizedfor use with the LM2599 series. This
feature greatly simplifies the designof 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 80μA
standby current. Self protection features includea two stage
current limitfor the output switch andan over temperature
shutdownfor complete protection under fault conditions.
Features 3.3V, 5V, 12V, and adjustable output versions Adjustable version output voltage range, 1.2Vto 37V
±4% max over line and load conditions Guaranteed3A output current Availablein 7-pin TO-220 and TO-263 (surface mount)
Package Input voltage rangeupto 40V 150 kHz fixed frequency internal oscillator Shutdown/Soft-start Outof regulation error flag Error output delay Low power standby mode,IQ typically80μA 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
Note:† Patent Number 5,382,918.
Typical Application (Fixed Output Voltage Versions)
DS012582-1
December 2000
LM2599
SIMPLE
SWITCHER
Power
Converter
kHz
Step-Down
oltage
Regulator
with
Features
