tps54331数据手册_TPS54331

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100

0.01 0.1 1 10

Efficiency-%

I -LoadCurrent- A

V =3.3V

V =12V

V =18V

V =24V

V =28V

V =5V

VIN

GND

BOOT

VSENSE

COMP

VIN

BOOT

Ren1

Ren2

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TPS54331

SLVS839F –JULY 2008–REVISED OCTOBER 2014

TPS54331 3-A, 28-V Input, Step Down DC-DC Converter With Eco-mode™

1 Features 3 Description

The TPS54331 device is a 28-V, 3-A non-

• 3.5 to 28-V Input Voltage Range

synchronous buck converter that integrates a low

• Adjustable Output Voltage Down to 0.8 V

DS(on)

high-side MOSFET. To increase efficiency at

• Integrated 80-m Ω High-Side MOSFET Supports

light loads, a pulse skipping Eco-mode feature is

up to 3-A Continuous Output Current

automatically activated. Furthermore, the 1- μA

shutdown supply-current allows the device to be used

• High Efficiency at Light Loads With a Pulse

in battery-powered applications. Current mode control

Skipping Eco-mode™

with internal slope compensation simplifies the

• Fixed 570 kHz Switching Frequency

external compensation calculations and reduces

• Typical 1-μA Shutdown Quiescent Current

component count while allowing the use of ceramic

output capacitors. A resistor divider programs the

• Adjustable Slow-Start Limits Inrush Currents

hysteresis of the input undervoltage lockout. An

• Programmable UVLO Threshold

overvoltage transient protection circuit limits voltage

• Overvoltage Transient Protection

overshoots during startup and transient conditions. A

cycle-by-cycle current-limit scheme, frequency

• Cycle-by-Cycle Current Limit, Frequency Fold

foldback and thermal shutdown protect the device

Back, and Thermal Shutdown Protection

and the load in the event of an overload condition.

• Available in Easy-to-Use SOIC8 Package or

The TPS54331 device is available in an 8-pin SOIC

Thermally Enhanced SOIC8 PowerPAD™

package and 8-pin SO PowerPAD package that have

Package

been internally optimized to improve thermal

• Supported by WEBENCH

Software Tool

performance.

(www.TI.com/WEBENCH)

Device Information

(1)

2 Applications PART NUMBER PACKAGE BODY SIZE (NOM)

SOIC (8)

• Consumer Applications such as Set-Top Boxes,

TPS54331 4.90 mm × 3.90 mm

SO PowerPAD (8)

CPE Equipment, LCD Displays, Peripherals, and

Battery Chargers

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

• Industrial and Car-Audio Power Supplies

• 5-V, 12-V, and 24-V Distributed Power Systems

4 Simplified Schematic

TPS54331 (D Package) Efficiency

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.

TPS54331

SLVS839F –JULY 2008–REVISED OCTOBER 2014

www.ti.com

Table of Contents

8.3 Feature Description................................................. 10

1 Features.................................................................. 1

8.4 Device Functional Modes........................................ 13

2 Applications ........................................................... 1

9 Application and Implementation ........................ 14

3 Description ............................................................. 1

9.1 Application Information............................................ 14

4 Simplified Schematic............................................. 1

9.2 Typical Application .................................................. 14

5 Revision History..................................................... 2

10 Power Supply Recommendations ..................... 24

6 Pin Configuration and Functions......................... 4

11 Layout................................................................... 24

7 Specifications......................................................... 5

11.1 Layout Guidelines ................................................. 24

7.1 Absolute Maximum Ratings ..................................... 5

11.2 Layout Example .................................................... 25

7.2 Handling Ratings....................................................... 5

11.3 Electromagnetic Interference (EMI)

7.3 Recommended Operating Conditions....................... 5

Considerations ......................................................... 25

7.4 Thermal Information.................................................. 6

12 Device and Documentation Support ................. 26

7.5 Electrical Characteristics........................................... 6

12.1 Device Support...................................................... 26

7.6 Switching Characteristics.......................................... 7

12.2 Trademarks ........................................................... 26

7.7 Typical Characteristics.............................................. 7

12.3 Electrostatic Discharge Caution............................ 26

8 Detailed Description.............................................. 9

12.4 Glossary ................................................................ 26

8.1 Overview ................................................................... 9

13 Mechanical, Packaging, and Orderable

8.2 Functional Block Diagram ....................................... 10

Information ........................................................... 26

5 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision E (February 2012) to Revision F Page

• Added Handling 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

• Updated the inductor current equations for I

L(RMS)

and I

L(PK)

............................................................................................... 16

Changes from Revision D (January 2012) to Revision E Page

• Deleted Feature Item: For SWIFT™ Documentation, See the TI Website at www.ti.com/swift............................................. 1

• Removed Swift™ from the data sheet title............................................................................................................................. 1

Changes from Revision C (March 2010) to Revision D Page

• Added the DDA Package to the Pin Assignments ................................................................................................................. 4

• Added TPS54331 device DDA option to the Ordering Information table ............................................................................... 4

• Changed Figure 21............................................................................................................................................................... 22

• Added Figure 24 ................................................................................................................................................................... 23

Changes from Revision B (October 2008) to Revision C Page

• Changed the ABSOLUTE MAXIMUM RATINGS table, Input Voltage - EN pin max value From: 5V to 6V.......................... 5

• Added a new table to the Description - For additional design needs................................................................................... 14