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LM2599 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM2599
Description  SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM2599
SIMPLE SWITCHER® Power Converter 150 kHz 3A
Step-Down Voltage Regulator, with Features
General Description
The LM2599 series of regulators are monolithic integrated
circuits that provide all the active functions for a step-down
(buck) switching regulator, capable of driving a 3A load with
excellent line and load regulation. These devices are avail-
able in fixed output voltages of 3.3V, 5V, 12V, and an adjust-
able output version.
This series of switching regulators is similar to the LM2596
series, with additional supervisory and performance features
added.
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, error flag de-
lay and error flag output.
The LM2599 series 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-lead TO-220 package with several
different lead bend options, and a 7-lead TO-263 Surface
mount package.
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 LM2599 series. This fea-
ture 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 80 µA
standby current. Self protection features include a two stage
current limit for the output switch and an over temperature
shutdown for complete protection under fault conditions.
Features
n
3.3V, 5V, 12V, and adjustable output versions
n
Adjustable version output voltage range, 1.2V to 37V
±4% max over line and load conditions
n
Guaranteed 3A output current
n
Available in 7-pin TO-220 and TO-263 (surface mount)
Package
n
Input voltage range up to 40V
n
150 kHz fixed frequency internal oscillator
n
Shutdown/Soft-start
n
Out of regulation error flag
n
Error output delay
n
Low power standby mode, I
Q typically 80 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 converter
Note: † Patent Number 5,382,918.
Typical Application (Fixed Output Voltage Versions)
SIMPLE SWITCHER® and
Switchers Made Simple® are registered trademarks of National Semiconductor Corporation.
DS012582-1
April 1998
© 2000 National Semiconductor Corporation
DS012582
www.national.com




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