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LM22678 Arkusz danych(PDF) 1 Page - Texas Instruments

Numer części LM22678
Szczegółowy opis  SIMPLE SWITCHER Step-Down Voltage Regulator With Features
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Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

LM22678 Arkusz danych(HTML) 1 Page - Texas Instruments

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LM22678, LM22678-Q1
SNVS585L – SEPTEMBER 2008 – REVISED NOVEMBER 2014
LM22678/-Q1 42-V, 5-A SIMPLE SWITCHER® Step-Down Voltage Regulator
With Features
1 Features
3 Description
The LM22678 switching regulator provides all of the
1
Wide Input Voltage Range: 4.5 V to 42 V
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 42-V N-channel MOSFET switch that
100-m
Ω N-Channel MOSFET
can provide up to 5 A of load current. Excellent line
Output Voltage Options:
and load regulation along with high efficiency (> 90%)
-ADJ (Outputs as Low as 1.285 V)
are featured. Voltage mode control offers short
-5.0 (Output Fixed to 5 V)
minimum on-time, allowing the widest ratio between
±1.5% Feedback Reference Accuracy
input and output voltages. Internal loop compensation
means that the user is free from the tedious task of
Switching Frequency of 500 kHz
calculating the loop compensation components. Fixed
–40°C to 125°C Operating Junction Temperature
5-V output and adjustable output voltage options are
Range
available. A switching frequency of 500 kHz allows for
Precision Enable Pin
small
external
components
and
good
transient
response.
A
precision
enable
input
allows
Integrated Boot-Strap Diode
simplification of regulator control and system power
Integrated Soft-Start
sequencing. In shutdown mode the regulator draws
Fully WEBENCH® Enabled
only 25 µA (typical). Built-in soft-start (500 µs, typical)
saves external components. The LM22678 device
LM22678-Q1 is an Automotive-Grade Product
also has built-in thermal shutdown, and current
that is AEC-Q100 Grade 1 Qualified (–40°C to
limiting to protect against accidental overloads.
+125°C Operating Junction Temperature)
PFM (Exposed Pad) Package
The
LM22678
device
is
a
member
of
Texas
Instruments'
SIMPLE
SWITCHER®
family.
The
SIMPLE SWITCHER concept provides for an easy-to-
2 Applications
use complete design using a minimum number of
Industrial Control
external components and the TI WEBENCH design
Telecom and Datacom Systems
tool. TI's WEBENCH tool includes features such as
external component calculation, electrical simulation,
Embedded Systems
thermal simulation, and Build-It boards for easy
Conversions from Standard 24-V, 12-V and 5-V
design-in.
Input Rails
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM22678
TO-263 (7)
10.16 mm x 9.85 mm
LM22678-Q1
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Schematic
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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