LM2672M-12 National Semiconductor, LM2672M-12 Datasheet
![DC/DC Converter IC](/photos/18/97/189768/3778330_sml.jpg)
LM2672M-12
Manufacturer Part Number
LM2672M-12
Description
DC/DC Converter IC
Manufacturer
National Semiconductor
Specifications of LM2672M-12
Input Voltage
40V
Output Current
1A
Output Voltage
12V
No. Of Pins
8
Mounting Type
Surface Mount
Voltage Regulator Type
Switching
Output Current Max
1A
Peak Reflow Compatible (260 C)
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM2672M-12/NOPB
Manufacturer:
National Semiconductor
Quantity:
135
Company:
Part Number:
LM2672M-12/NOPB
Manufacturer:
NS
Quantity:
10
© 2005 National Semiconductor Corporation
LM2672
SIMPLE SWITCHER
1A Step-Down Voltage Regulator with Features
General Description
The LM2672 series of regulators are monolithic integrated
circuits built with a LMDMOS process. These regulators
provide all the active functions for a step-down (buck)
switching regulator, capable of driving a 1A load current with
excellent line and load regulation. These devices are avail-
able 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 LM2672 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 (
per traces on the printed circuit board are the only heat
sinking needed.
A family of standard inductors for use with the LM2672 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
output voltage within specified input voltages and output
load conditions, and
ternal shutdown is included, featuring typically 50 µA
stand-by current. The output switch includes current limiting,
as well as thermal shutdown for full protection under fault
conditions.
Typical Application
Versions)
SIMPLE SWITCHER
Windows
®
is a registered trademark of Microsoft Corporation.
®
is a registered trademark of National Semiconductor Corporation.
±
10% on the oscillator frequency. Ex-
(Fixed Output Voltage
±
DS012934
1.5% tolerance on
®
>
90%), the cop-
Power Converter High Efficiency
To simplify the LM2672 buck regulator design procedure,
there exists computer design software, LM267X Made
Simple version 1.0.
Features
n Efficiency up to 96%
n Available in SO-8 and 8-pin DIP packages
n Computer Design Software LM267X Made Simple
n Simple and easy to design with
n Requires only 5 external components
n Uses readily available standard inductors
n 3.3V, 5.0V, 12V, and adjustable output versions
n Adjustable version output voltage range: 1.21V to 37V
n
n Guaranteed 1A output load current
n 0.25Ω DMOS Output Switch
n Wide input voltage range: 8V to 40V
n 260 kHz fixed frequency internal oscillator
n TTL shutdown capability, low power standby mode
n Soft-start and frequency synchronization
n Thermal shutdown and current limit protection
Typical Applications
n Simple High Efficiency (
n Efficient Pre-Regulator for Linear Regulators
version 1.0
conditions
Regulator
±
1.5% max output voltage tolerance over line and load
01293401
>
90%) Step-Down (Buck)
February 2005
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