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LM22670 bảng dữ liệu(PDF) 1 Page - Texas Instruments

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LM22670 bảng dữ liệu(HTML) 1 Page - Texas Instruments

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LM22670, LM22670-Q1
SNVS584P – SEPTEMBER 2008 – REVISED NOVEMBER 2014
LM22670/-Q1 42-V, 3-A SIMPLE SWITCHER®, Step-Down Voltage Regulator
With Features
1 Features
3 Description
The LM22670 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
120-m
Ω N-channel MOSFET PFM Package
can provide up to 3 A of load current. Excellent line
100-m
Ω N-channel MOSFET SO PowerPAD™-8
and load regulation along with high efficiency (> 90%)
Package
are featured. Voltage mode control offers short
Output Voltage Options:
minimum on-time, allowing the widest ratio between
-ADJ (Outputs as Low as 1.285 V)
input and output voltages. Internal loop compensation
-5.0 (Output Fixed to 5 V)
means that the user is free from the tedious task of
calculating the loop compensation components. Fixed
±1.5% Feedback Reference Accuracy
5-V output and adjustable output voltage options are
500-kHz Default Switching Frequency
available. The default switching frequency is set at
Adjustable Switching Frequency and
500 kHz, thus allowing for small external components
Synchronization
and
good
transient
response.
In
addition,
the
frequency can be adjusted over a range of 200 kHz
–40°C to 125°C Operating Junction Temperature
to 1 MHz with a single external resistor. The internal
Range
oscillator can be synchronized to a system clock or to
Precision Enable Pin
the oscillator of another regulator. A precision enable
Integrated Boot-Strap Diode
input allows simplification of regulator control and
system power sequencing. In shutdown mode the
Integrated Soft-Start
regulator draws only 25 µA (typical). Built in soft-start
Fully WEBENCH® Enabled
(500 µs, typical) saves external components. The
LM22670-Q1 is an Automotive-Grade Product
LM22670 device also has built-in thermal shutdown,
that is AEC-Q100 Grade 1 Qualified (–40°C to
and current limiting to protect against accidental
+125°C Operating Junction Temperature)
overloads.
The
LM22670
device
is
a
member
of
Texas
2 Applications
Instruments'
SIMPLE
SWITCHER®
family.
The
SIMPLE SWITCHER® concept provides for an easy-
Industrial Control
to-use complete design using a minimum number of
Telecom and Datacom Systems
external components and the TI WEBENCH design
Embedded Systems
tool. TI's WEBENCH tool includes features such as
Conversions from Standard 24-V, 12-V and 5-V
external component calculation, electrical simulation,
thermal simulation, and Build-It boards for easy
Input Rails
design-in.
Simplified Application Schematic
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
HSOP (8)
4.89 mm x 3.90 mm
LM22670
LM22670-Q1
TO-263 (7)
10.16 mm x 9.85 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
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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