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TPS54361 4.5-V to 60-V Input, 3.5-A, Step-Down DC-DC Converter With Soft-Start and Eco-Mode™
SLVSC39D
November 2013 – January 2017
TPS54361
PRODUCTION DATA.
CONTENTS
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TPS54361 4.5-V to 60-V Input, 3.5-A, Step-Down DC-DC Converter With Soft-Start and Eco-Mode™
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
Timing Requirements
6.7
Switching Characteristics
6.8
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
Slope Compensation Output Current
7.3.3
Pulse-Skip Eco-Mode
7.3.4
Low Dropout Operation and Bootstrap Voltage (BOOT)
7.3.5
Error Amplifier
7.3.6
Adjusting the Output Voltage
7.3.7
Enable and Adjust Undervoltage Lockout
7.3.8
Soft-Start/Tracking Pin (SS/TR)
7.3.9
Sequencing
7.3.10
Constant Switching Frequency and Timing Resistor (RT/CLK) Pin)
7.3.11
Synchronization to RT/CLK Pin
7.3.12
Maximum Switching Frequency
7.3.13
Accurate Current Limit Operation
7.3.14
Power Good (PWRGD Pin)
7.3.15
Overvoltage Protection
7.3.16
Thermal Shutdown
7.3.17
Small Signal Model for Loop Response
7.3.18
Simple Small Signal Model for Peak Current Mode Control
7.3.19
Small Signal Model for Frequency Compensation
7.4
Device Functional Modes
8
Application and Implementation
8.1
Application Information
8.2
Typical Applications
8.2.1
Buck Converter With 7-V to 60-V Input and 5-V at 3.5-A Output
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.2.1
Custom Design with WEBENCH® Tools
8.2.1.2.2
Selecting the Switching Frequency
8.2.1.2.3
Output Inductor Selection (LO)
8.2.1.2.4
Output Capacitor
8.2.1.2.5
Catch Diode
8.2.1.2.6
Input Capacitor
8.2.1.2.7
Soft-Start Capacitor
8.2.1.2.8
Bootstrap Capacitor Selection
8.2.1.2.9
Undervoltage Lockout Set Point
8.2.1.2.10
Output Voltage and Feedback Resistors Selection
8.2.1.2.11
Compensation
8.2.1.2.12
Power Dissipation Estimate
8.2.1.2.13
Discontinuous Conduction Mode and Eco-Mode Boundary
8.2.1.3
Application Curves
8.2.2
Inverting Power Supply
8.2.3
Split-Rail Power Supply
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
10.3
Estimated Circuit Area
11
Device and Documentation Support
11.1
Device Support
11.1.1
Third-Party Products Disclaimer
11.1.2
Development Support
11.2
Documentation Support
11.2.1
Related Documentation
11.2.2
Custom Design with WEBENCH® Tools
11.3
Receiving Notification of Documentation Updates
11.4
Community Resources
11.5
Trademarks
11.6
Electrostatic Discharge Caution
11.7
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
DPR|10
MPSS046B
Thermal pad, mechanical data (Package|Pins)
Orderable Information
slvsc39d_oa
slvsc39d_pm
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