LM2672 Datasheet, PDF (1/36 Pages) National Semiconductor (TI) – SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features

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LM2672
SNVS136L – SEPTEMBER 1998 – REVISED JUNE 2016
LM2672 SIMPLE SWITCHER^® Power Converter High Efficiency 1-A Step-Down Voltage
Regulator with Features
1 Features
•1 Efficiency up to 96%
• Available in 8-Pin SOIC and PDIP Packages
• Requires only 5 External Components
• 3.3-V, 5-V, 12-V, and Adjustable Output Versions
• Adjustable Version Output Voltage Range: 1.21 V
to 37 V
• ±1.5% Maximum Output Voltage Tolerance Over
Line and Load Conditions
• Specified 1-A Output Load Current
• Wide Input Voltage Range: 8 V to 40 V
• 260-kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability, Low Power Standby
Mode
• Soft-Start and Frequency Synchronization
• Thermal Shutdown and Current Limit Protection
2 Applications
• Simple High Efficiency (>90%) Step-Down (Buck)
Regulator
• Efficient Preregulator for Linear Regulators
3 Description
The LM2672 series of regulators are monolithic
integrated DC-DC converter built with a LMDMOS
process. These regulators provide all the active
functions for a step-down (buck) switching regulator,
capable of driving a 1-A load current with excellent
line and load regulation. These devices are available
in fixed output voltages of 3.3 V, 5 V, 12 V, and an
adjustable output version.
Requiring a minimum number of external
components, these regulators are simple to use and
include patented internal frequency compensation,
fixed frequency oscillator, external shutdown, soft-
start, and frequency synchronization.
The LM2672 series operates at a switching frequency
of 260 kHz, thus allowing smaller sized filter
components than what is required with lower
frequency switching regulators. Because of its very
high efficiency (>90%), the copper traces on the
printed-circuit board are the only heat sinking
required.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SOIC (8)
5.00 mm × 6.20 mm
LM2672
PDIP (8)
10.16 mm × 6.60 mm
WSON (16)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
Fixed output voltage versions
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.