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TPS54331 3-A, 28-V Input, Step Down DC-DC Converter With Eco-mode
SLVS839H
July 2008 – October 2023
TPS54331
PRODUCTION DATA
CONTENTS
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TPS54331 3-A, 28-V Input, Step Down DC-DC Converter With Eco-mode
1
1
Features
2
Applications
3
Description
4
Revision History
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Switching Characteristics
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Fixed-Frequency PWM Control
7.3.2
Voltage Reference (VREF)
7.3.3
Bootstrap Voltage (BOOT)
7.3.4
Enable and Adjustable Input Undervoltage Lockout (VIN UVLO)
7.3.5
Programmable Slow Start Using SS Pin
7.3.6
Error Amplifier
7.3.7
Slope Compensation
7.3.8
Current-Mode Compensation Design
7.3.9
Overcurrent Protection and Frequency Shift
7.3.10
Overvoltage Transient Protection
7.3.11
Thermal Shutdown
7.4
Device Functional Modes
7.4.1
Eco-mode
7.4.2
Operation With VIN < 3.5 V
7.4.3
Operation With EN Control
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Custom Design with WEBENCH® Tools
8.2.2.2
Switching Frequency
8.2.2.3
Output Voltage Set-Point
8.2.2.4
Input Capacitors
8.2.2.5
Output Filter Components
8.2.2.5.1
Inductor Selection
8.2.2.6
Capacitor Selection
8.2.2.7
Compensation Components
8.2.2.8
Bootstrap Capacitor
8.2.2.9
Catch Diode
8.2.2.10
Output Voltage Limitations
8.2.2.11
Power Dissipation Estimate
8.2.3
Application Curves
8.3
Power Supply Recommendations
8.4
Layout
8.4.1
Layout Guidelines
8.4.2
Layout Example
8.4.3
Electromagnetic Interference (EMI) Considerations
9
Device and Documentation Support
9.1
Device Support
9.1.1
Development Support
9.1.1.1
Custom Design with WEBENCH® Tools
9.2
Support Resources
9.3
Receiving Notification of Documentation Updates
9.4
Trademarks
9.5
Electrostatic Discharge Caution
9.6
Glossary
10
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
D|8
MSOI002K
DDA|8
MPDS092F
Thermal pad, mechanical data (Package|Pins)
DDA|8
PPTD087E
Orderable Information
slvs839h_oa
slvs839h_pm
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Data Sheet
TPS54331 3-A, 28-V Input, Step Down DC-DC Converter With Eco-mode
1
Features
3.5 to 28-V input voltage range
Adjustable output voltage down to 0.8 V
Integrated 80-mΩ high-side MOSFET supports up to 3-A continuous output current
High efficiency at light loads with a pulse skipping Eco-mode
Fixed 570-kHz switching frequency
Typical 1-μA shutdown quiescent current
Adjustable slow-start limits inrush currents
Programmable UVLO threshold
Overvoltage transient protection
Cycle-by-cycle current limit, frequency foldback, and thermal shutdown protection
Available in easy-to-use SOIC8 package or thermally-enhanced SOIC8
PowerPAD™
integrated circuit package
Create a custom design using the TPS54331 with the
WEBENCH®
Power Designer
Use
TPS62933
for a 30 VIN converter with higher frequency, lower IQ and improved EMI
2
Applications
Consumer applications such as
set-top boxes
, CPE equipment, LCD displays, peripherals, and
battery chargers
Industrial
and car-audio power supplies
5-V, 12-V, and 24-V distributed power systems
