Datasheet

LM22678-ADJ
VIN
EN
SW
BOOT
FB
GND
VIN
VOUT
LM22678
www.ti.com
SNVS585K SEPTEMBER 2008REVISED MARCH 2013
LM22678/LM22678Q 42V, 5A SIMPLE SWITCHER
®
Step-Down Voltage Regulator with
Features
Check for Samples: LM22678
1
FEATURES
DESCRIPTION
The LM22678 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
100 m N-Channel MOSFET
capable of providing up to 5A of load current.
Output Voltage Options:
Excellent line and load regulation along with high
-ADJ (Outputs as Low as 1.285V)
efficiency (>90%) are featured. Voltage mode control
offers short minimum on-time, allowing the widest
-5.0 (Output Fixed to 5V)
ratio between input and output voltages. Internal loop
±1.5% Feedback Reference Accuracy
compensation means that the user is free from the
Switching Frequency of 500 kHz
tedious task of calculating the loop compensation
components. Fixed 5V output and adjustable output
-40°C to 125°C Operating Junction
voltage options are available. A switching frequency
Temperature Range
of 500 kHz allows for small external components and
Precision Enable Pin
good transient response. A precision enable input
Integrated Boot-Strap Diode
allows simplification of regulator control and system
power sequencing. In shutdown mode the regulator
Integrated Soft-Start
draws only 25 µA (typ.). Built in soft-start (500µs, typ)
Fully WEBENCH
®
enabled
saves external components. The LM22678 also has
LM22678Q is an Automotive Grade Product
built in thermal shutdown, and current limiting to
that is AEC-Q100 Grade 1 Qualified (-40°C to
protect against accidental overloads.
+125°C Operating Junction Temperature)
The LM22678 is a member of Texas Instruments'
PFM (Exposed Pad) Package
SIMPLE SWITCHER
®
family. The SIMPLE
SWITCHER concept provides for an easy to use
APPLICATIONS
complete design using a minimum number of external
components and the TI WEBENCH design tool. TI's
Industrial Control
WEBENCH tool includes features such as external
Telecom and Datacom Systems
component calculation, electrical simulation, thermal
Embedded Systems
simulation, and Build-It boards for easy design-in.
Conversions from Standard 24V, 12V and 5V
Input Rails
Simplified Application Schematic
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.
2SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments.
3All 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.

Summary of content (23 pages)