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TPS54040A 0.5-A, 42-V Step-Down DC-DC Converter With Eco-Mode™
SLVSB58B
March 2012 – January 2016
TPS54040A
PRODUCTION DATA.
CONTENTS
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TPS54040A 0.5-A, 42-V Step-Down DC-DC Converter With 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
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
Bootstrap Voltage (BOOT)
7.3.4
Low Dropout Operation
7.3.5
Error Amplifier
7.3.6
Voltage Reference
7.3.7
Adjusting the Output Voltage
7.3.8
Enable and Adjusting Undervoltage Lockout
7.3.9
Slow Start/Tracking Pin (SS/TR)
7.3.10
Overload Recovery Circuit
7.3.11
Sequencing
7.3.12
Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
7.3.13
Overcurrent Protection and Frequency Shift
7.3.14
Selecting the Switching Frequency
7.3.15
How to Interface to RT/CLK Pin
7.3.16
Power Good (PWRGD Pin)
7.3.17
Overvoltage Transient Protection
7.3.18
Thermal Shutdown
7.3.19
Small Signal Model for Loop Response
7.3.20
Simple Small Signal Model for Peak Current Mode Control
7.3.21
Small Signal Model for Frequency Compensation
7.4
Device Functional Modes
7.4.1
Pulse-Skip Eco-Mode
7.4.2
Normal Operation
7.4.3
Standby Operation
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
Under Voltage Lock Out Set Point
8.2.2.9
Output Voltage and Feedback Resistors Selection
8.2.2.10
Compensation
8.2.2.11
Power Dissipation Estimate
8.2.3
Application Curves
8.3
System Examples
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
11.2
Community Resources
11.3
Trademarks
11.4
Electrostatic Discharge Caution
11.5
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
DGQ|10
MPDS043F
DRC|10
MPDS117L
Thermal pad, mechanical data (Package|Pins)
DGQ|10
PPTD325B
DRC|10
QFND013N
Orderable Information
slvsb58b_oa
slvsb58b_pm
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