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TPS57140-Q1 1.5-A 42-V Step-Down DC-DC Converter With Eco-mode™ Control
SLVSAP3D
December 2010 – February 2016
TPS57140-Q1
PRODUCTION DATA.
CONTENTS
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TPS57140-Q1 1.5-A 42-V Step-Down DC-DC Converter With Eco-mode™ Control
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
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
Low-Dropout Operation and Bootstrap Voltage (Boot)
7.3.4
Error Amplifier
7.3.5
Voltage Reference
7.3.6
Adjusting the Output Voltage
7.3.7
Enable and Adjusting Undervoltage Lockout (UVLO)
7.3.8
Slow-Start and Tracking Pin (SS/TR)
7.3.9
Overload Recovery Circuit
7.3.10
Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
7.3.11
Overcurrent Protection and Frequency Shift
7.3.12
Selecting the Switching Frequency
7.3.13
How to Interface to RT/CLK Pin
7.3.14
Power Good (PWRGD Pin)
7.3.15
Overvoltage Transient 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
7.4.1
Sequencing
7.4.2
Pulse-Skip Eco-mode
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
Selecting the Switching Frequency
8.2.2.2
Output Inductor Selection (LO)
8.2.2.3
Output Capacitor
8.2.2.4
Catch Diode
8.2.2.5
Input Capacitor
8.2.2.6
Slow-Start Capacitor
8.2.2.7
Bootstrap Capacitor Selection
8.2.2.8
Undervoltage Lockout (UVLO) Set Point
8.2.2.9
Output Voltage and Feedback Resistors Selection
8.2.2.10
Compensation
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
10.3
Power Dissipation Estimate
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
11.3
Community Resource
11.4
Trademarks
11.5
Electrostatic Discharge Caution
11.6
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
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