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LM22676, LM22676-Q1
SNVS587L –SEPTEMBER 2008–REVISED NOVEMBER 2014
LM22676/-Q1 42 V, 3 A SIMPLE SWITCHER® Step-Down Voltage Regulator
with Features
1 Features
3 Description
The LM22676 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
incorporates a 42 V N-channel MOSFET switch
capable of providing up to 3 A 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 5 V output and adjustable output
voltage options are available. A switching frequency
of 500 kHz allows for small external components and
good transient response. 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 (500 µs, typ)
saves external components. The LM22676 also has
built in thermal shutdown, and current limiting to
protect against accidental overloads.
1
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Wide Input Voltage Range: 4.5 V to 42 V
Internally Compensated Voltage Mode Control
Stable with Low ESR Ceramic Capacitors
120 mΩ N-Channel MOSFET PFM Package
100 mΩ N-Channel MOSFET PSOP-8 Package
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Output Voltage Options:
-ADJ (Outputs as Low as 1.285 V)
-5.0 (Output Fixed to 5 V)
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±1.5% Feedback Reference Accuracy
Switching Frequency of 500 kHz
–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
LM22676Q is an Automotive Grade Product
that is AEC-Q100 Grade 1 Qualified (–40°C to
+125°C Operating Junction Temperature)
The LM22676 is a member of Texas Instruments'
SIMPLE
SWITCHER®
family.
The
SIMPLE
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•
SO PowerPAD (Exposed Pad
PFM (Exposed Pad)
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.
2 Applications
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Industrial Control
Telecom and Datacom Systems
Embedded Systems
Device Information(1)
Conversions from Standard 24 V, 12 V and 5 V
Input Rails
PART NUMBER
PACKAGE
HSOP (8)
TO-263 (3)
BODY SIZE (NOM)
4.89 mm x 3.90 mm
10.16 mm x 9.85 mm
LM22676,
LM22676-Q1
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Schematic
VIN
VIN
FB
BOOT
SW
LM22676-ADJ
VOUT
EN GND
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.