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LM22670QMRE-ADJ Scheda tecnica(PDF) 1 Page - Texas Instruments

Il numero della parte LM22670QMRE-ADJ
Spiegazioni elettronici  LM22670/LM22670Q 42V, 3A SIMPLE SWITCHER, Step-Down Voltage Regulator with
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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
1
FEATURES
DESCRIPTION
The LM22670 switching regulator provides all of the
23
Wide Input Voltage Range: 4.5V to 42V
functions necessary to implement an efficient high
Internally Compensated Voltage Mode Control
voltage step-down (buck) regulator using a minimum
Stable with Low ESR Ceramic Capacitors
of external components. This easy to use regulator
incorporates
a
42V
N-channel
MOSFET
switch
120 m
Ω N-channel MOSFET PFM Package
capable of providing up to 3A of load current.
100 m
Ω N-channel MOSFET SO PowerPAD-8
Excellent line and load regulation along with high
Package
efficiency (>90%) are featured. Voltage mode control
Output Voltage Options:
offers short minimum on-time, allowing the widest
ratio between input and output voltages. Internal loop
-ADJ (outputs as low as 1.285V)
compensation means that the user is free from the
-5.0 (output fixed to 5V)
tedious task of calculating the loop compensation
±1.5% Feedback Reference Accuracy
components. Fixed 5V output and adjustable output
voltage options are available. The default switching
500 kHz Default Switching Frequency
frequency is set at 500 kHz allowing for small
Adjustable Switching Frequency and
external components and good transient response. In
Synchronization
addition, the frequency can be adjusted over a range
-40°C to 125°C Operating Junction
of 200 kHz to 1MHz with a single external resistor.
Temperature Range
The internal oscillator can be synchronized to a
system clock or to the oscillator of another regulator.
Precision Enable Pin
A precision enable input allows simplification of
Integrated Boot-Strap Diode
regulator control and system power sequencing. In
Integrated Soft-Start
shutdown mode the regulator draws only 25 µA (typ.).
Built
in
soft-start
(500µs,
typ)
saves
external
Fully WEBENCH® enabled
components. The LM22670 also has built in thermal
LM22670Q is an Automotive Grade Product
shutdown, and current limiting to protect against
that is AEC-Q100 Grade 1 Qualified (-40°C to
accidental overloads.
+125°C Operating Junction Temperature)
The LM22670 is a member of Texas Instruments'
SO PowerPAD-8 (Exposed Pad) Package
SIMPLE
SWITCHER®
family.
The
SIMPLE
PFM (Exposed Pad) Package
SWITCHER concept provides for an easy to use
complete design using a minimum number of external
APPLICATIONS
components and the TI WEBENCH design tool. TI's
WEBENCH tool includes features such as external
Industrial Control
component calculation, electrical simulation, thermal
Telecom and Datacom Systems
simulation, and Build-It boards for easy design-in.
Embedded Systems
Conversions from Standard 24V, 12V and 5V
Input Rails
1
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.
2
SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments Incorporated.
3
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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