LM2574HVM12

Manufacturer Part NumberLM2574HVM12
DescriptionSOP-14
ManufacturerNational Semiconductor
LM2574HVM12 datasheet
 


Specifications of LM2574HVM12

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LM2574/LM2574HV
SIMPLE SWITCHER
General Description
The LM2574 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 devices are
available in fixed output voltages of 3.3V, 5V, 12V, 15V, and
an adjustable output version.
Requiring a minimum number of external components, these
regulators are simple to use and include internal frequency
compensation and a fixed-frequency oscillator.
The LM2574 series offers a high-efficiency replacement for
popular three-terminal linear regulators. Because of its high
efficiency, the copper traces on the printed circuit board are
normally the only heat sinking needed.
A standard series of inductors optimized for use with the
LM2574 are available from several different manufacturers.
This feature greatly simplifies the design of switch-mode
power supplies.
±
Other features include a guaranteed
4% tolerance on out-
put voltage within specified input voltages and output load
±
conditions, and
10% on the oscillator frequency. External
shutdown is included, featuring 50 µA (typical) standby cur-
rent. The output switch includes cycle-by-cycle current limit-
ing, as well as thermal shutdown for full protection under
fault conditions.
Typical Application
(Fixed Output Voltage Versions)
Note: Pin numbers are for 8-pin DIP package.
Patent Pending
SIMPLE SWITCHER
is a trademark of National Semiconductor Corporation
© 1999 National Semiconductor Corporation
DS011394
0.5A Step-Down Voltage Regulator
Features
n 3.3V, 5V, 12V, 15V, and adjustable output versions
n Adjustable version output voltage range, 1.23V to 37V
(57V for HV version)
conditions
n Guaranteed 0.5A output current
n Wide input voltage range, 40V, up to 60V for HV version
n Requires only 4 external components
n 52 kHz fixed frequency internal oscillator
n TTL shutdown capability, low power standby mode
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 (Buck-Boost)
June 1999
±
4% max over line and load
DS011394-1
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