LM2671MX-5.0

Manufacturer Part NumberLM2671MX-5.0
DescriptionIC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR/MOS,SOP,8PIN,PLASTIC
ManufacturerNational Semiconductor
LM2671MX-5.0 datasheets
 


Specifications of LM2671MX-5.0

Rohs CompliantNO  
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LM2671
SIMPLE SWITCHER
500mA Step-Down Voltage Regulator with Features
General Description
The LM2671 series of regulators are monolithic integrated
circuits built with a LMDMOS process. These regulators pro-
vide all the active functions for a step-down (buck) switching
regulator, capable of driving a 500mA load current with ex-
cellent line and load regulation. These devices are available
in fixed output voltages of 3.3V, 5.0V, 12V, and an adjustable
output version.
Requiring a minimum number of external components, these
regulators are simple to use and include patented internal
frequency compensation (Patent Nos. 5,382,918 and
5,514,947), fixed frequency oscillator, external shutdown,
soft-start, and frequency synchronization.
The LM2671 series operates at a switching frequency of
260 kHz, thus allowing smaller sized filter components than
what would be needed with lower frequency switching regu-
lators. Because of its very high efficiency (>90%), the copper
traces on the printed circuit board are the only heat sinking
needed.
A family of standard inductors for use with the LM2671 are
available from several different manufacturers. This feature
greatly simplifies the design of switch-mode power supplies
using these advanced ICs. Also included in the datasheet are
selector guides for diodes and capacitors designed to work in
switch-mode power supplies.
Other features include a guaranteed ±1.5% tolerance on out-
put voltage within specified input voltages and output load
conditions, and ±10% on the oscillator frequency. External
shutdown is included, featuring typically 50 μA stand-by cur-
rent. The output switch includes current limiting, as well as
thermal shutdown for full protection under fault conditions.
Typical Application
(Fixed Output Voltage Versions)
SIMPLE SWITCHER
®
is a registered trademark of National Semiconductor Corporation
Windows
®
is a registered trademark of Microsoft Corporation.
© 2007 National Semiconductor Corporation
®
Power Converter High Efficiency
To simplify the LM2671 buck regulator design procedure,
there exists computer design software, LM267X Made Sim-
ple (version 6.0).
Features
Efficiency up to 96%
Available in SO-8, 8-pin DIP and LLP packages
Computer Design Software LM267X Made Simple
(version 6.0)
Simple and easy to design with
Requires only 5 external components
Uses readily available standard inductors
3.3V, 5.0V, 12V, and adjustable output versions
Adjustable version output voltage range: 1.21V to 37V
±1.5% max output voltage tolerance over line and load
conditions
Guaranteed 500mA output load current
0.25Ω DMOS Output Switch
Wide input voltage range: 8V to 40V
260 kHz fixed frequency internal oscillator
TTL shutdown capability, low power standby mode
Soft-start and frequency synchronization
Thermal shutdown and current limit protection
Applications
Simple High Efficiency (>90%) Step-Down (Buck)
Regulator
Efficient Pre-Regulator for Linear Regulators
100042
April 2007
10004201
www.national.com