Buck Regulator. LM26400Y Datasheet

LM26400Y Regulator. Datasheet pdf. Equivalent


Part LM26400Y
Description 500-kHz Wide Input Range Buck Regulator
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LM26400Y Dual 2A, 500kHz Wide Input Range Buck Regulator Fe LM26400Y Datasheet
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LM26400Y
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LM26400Y
SNVS457D – FEBRUARY 2007 – REVISED OCTOBER 2015
LM26400Y Dual 2-A, 500-kHz Wide Input Range Buck Regulator
1 Features
1 Input Voltage Range of 3 V to 20 V
• Dual 2-A Output
• Output Voltage Down to 0.6 V
• Internal Compensation
• 500-kHz PWM Frequency
• Separate Enable Pins
• Separate Soft-Start Pins
• Frequency Foldback Protection
• 175-mNMOS Switch
• Integrated Bootstrap Diodes
• Overcurrent Protection
• HTSSOP and WSON Packages
• Thermal Shutdown
2 Applications
• DTV-LCD
• Set-Top Boxes
• XDSL
• Automotive
• Computing Peripherals
• Industrial Controls
• Points-of-Load
3 Description
The LM26400Y device is a monolithic, two-output
fixed-frequency PWM step-down DC-DC regulator, in
a 16-pin WSON or thermally-enhanced HTSSOP
package. With a minimum number of external
components and internal loop compensation, the
LM26400Y is easy to use.
The ability to drive 2-A loads with an internal 175-m
NMOS switch using state-of-the-art 0.5-µm BiCMOS
technology results in a high-power density design.
The world class control circuitry allows for an ON-
time as low as 40 ns, thus supporting high-frequency
conversion over the entire input range of 3 V to 20 V
and down to an output voltage of only 0.6 V. The
LM26400Y utilizes peak current-mode control and
internal compensation to provide high-performance
regulation over a wide range of line and load
conditions. Switching frequency is internally set to
500 kHz, optimal for a broad range of applications in
terms of size versus thermal tradeoffs.
Given a nonsynchronous architecture, efficiencies
above 90% are easy to achieve. External shutdown is
included, enabling separate turnon and turnoff of the
two channels. Additional features include
programmable soft-start circuitry to reduce inrush
current, pulse-by-pulse current limit and frequency
foldback, integrated bootstrap structure, and thermal
shutdown.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM26400Y
WSON (16)
HTSSOP (16)
5.00 mm × 5.00 mm
4.40 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
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.



LM26400Y
LM26400Y
SNVS457D – FEBRUARY 2007 – REVISED OCTOBER 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 6
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 13
8 Application and Implementation ........................ 15
8.1 Application Information............................................ 15
8.2 Typical Applications ............................................... 15
9 Power Supply Recommendations...................... 19
9.1 Low Input Voltage Considerations .......................... 19
9.2 Programming Output Voltage ................................. 19
10 Layout................................................................... 20
10.1 Layout Guidelines ................................................. 20
10.2 Layout Example .................................................... 24
10.3 Thermal Considerations ........................................ 24
11 Device and Documentation Support ................. 26
11.1 Device Support...................................................... 26
11.2 Community Resources.......................................... 26
11.3 Trademarks ........................................................... 26
11.4 Electrostatic Discharge Caution ............................ 26
11.5 Glossary ................................................................ 26
12 Mechanical, Packaging, and Orderable
Information ........................................................... 26
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (April 2013) to Revision D
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................. 1
Changes from Revision B (April 2013) to Revision C
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 18
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