LM22670
www.ti.com
SNVS584O –SEPTEMBER 2008–REVISED MARCH 2013
®
LM22670/LM22670Q 42V, 3A SIMPLE SWITCHER , Step-Down Voltage Regulator with
Features
Check for Samples: LM22670
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FEATURES
DESCRIPTION
The LM22670 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
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Wide Input Voltage Range: 4.5V to 42V
Internally Compensated Voltage Mode Control
Stable with Low ESR Ceramic Capacitors
120 mΩ N-channel MOSFET PFM Package
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incorporates
a 42V N-channel MOSFET switch
capable of providing up to 3A 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. The default switching
frequency is set at 500 kHz allowing for small
external components and good transient response. In
addition, the frequency can be adjusted over a range
of 200 kHz to 1MHz with a single external resistor.
The internal oscillator can be synchronized to a
system clock or to the oscillator of another regulator.
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 LM22670 also has built in thermal
shutdown, and current limiting to protect against
accidental overloads.
100 mΩ N-channel MOSFET SO PowerPAD-8
Package
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Output Voltage Options:
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-ADJ (outputs as low as 1.285V)
-5.0 (output fixed to 5V)
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±1.5% Feedback Reference Accuracy
500 kHz Default Switching Frequency
Adjustable Switching Frequency and
Synchronization
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-40°C to 125°C Operating Junction
Temperature Range
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Precision Enable Pin
Integrated Boot-Strap Diode
Integrated Soft-Start
Fully WEBENCH® enabled
LM22670Q is an Automotive Grade Product
that is AEC-Q100 Grade 1 Qualified (-40°C to
+125°C Operating Junction Temperature)
The LM22670 is a member of Texas Instruments'
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SO PowerPAD-8 (Exposed Pad) Package
PFM (Exposed Pad) Package
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.
APPLICATIONS
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Industrial Control
Telecom and Datacom Systems
Embedded Systems
Conversions from Standard 24V, 12V and 5V
Input Rails
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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.
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SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments Incorporated.
All other trademarks are the property of their respective owners.
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.
Copyright © 2008–2013, Texas Instruments Incorporated