SNVS590L – SEPTEMBER 2008 – REVISED APRIL 2013
LM22674/LM22674-Q1 42V, 500 mA SIMPLE SWITCHER® Step-Down Voltage Regulator
with Features
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FEATURES
Wide Input Voltage Range: 4.5V to 42V
Internally Compensated Voltage Mode Control
Stable with Low ESR Ceramic Capacitors
200 mΩ N-Channel MOSFET
Output Voltage Options:
– ADJ (Outputs as Low as 1.285V)
– 5.0 (Output Fixed to 5V)
±1.5% Feedback Reference Accuracy
Switching Frequency of 500 kHz
-40°C to 125°C Operating Junction
Temperature Range
Precision Enable Pin
Integrated Boot-Strap Diode
Integrated Soft-Start
Fully WEBENCH
®
Enabled
LM22674-Q1 is an Automotive Grade product
that is AEC-Q100 Grade 1 Qualified (-40°C to
+125°C Operating Junction Temperature)
DESCRIPTION
The LM22674 switching regulator provides all of the
functions necessary to implement an efficient high
voltage step-down (buck) regulator using a minimum
of external components. This easy to use regulator
incorporates a 42V N-channel MOSFET switch
capable of providing up to 500mA of load current.
Excellent line and load regulation along with high
efficiency (>90%) are featured. Voltage mode control
offers short minimum on-time, allowing the widest
ratio between input and output voltages. Internal loop
compensation means that the user is free from the
tedious task of calculating the loop compensation
components. Fixed 5V output and adjustable output
voltage options are available. A switching frequency
of 500 kHz allows for small external components and
good transient response. A precision enable input
allows simplification of regulator control and system
power sequencing. In shutdown mode the regulator
draws only 25 µA (typ.). Built in soft-start (500µs, typ)
saves external components. The LM22674 also has
built in thermal shutdown, and current limiting to
protect against accidental overloads.
The LM22674 is a member of Texas Instruments'
SIMPLE SWITCHER™ family. The SIMPLE
SWITCHER™ concept provides for an easy to use
complete design using a minimum number of external
components and the TI WEBENCH
®
design tool. TI's
WEBENCH
®
tool includes features such as external
component calculation, electrical simulation, thermal
simulation, and Build-It boards for easy design-in.
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PACKAGE
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SO PowerPAD (Exposed Pad)
APPLICATIONS
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Industrial Control
Telecom and Datacom Systems
Embedded Systems
Conversions from Standard 24V, 12V and 5V
Input Rails
Simplified Application Schematic
VIN
VIN
FB
LM22674-ADJ
BOOT
VOUT
EN
GND
SW
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
Copyright © 2008–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TI [ TEXAS INSTRUMENTS ]
