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TPS57040-Q1 0.5-A 42-V Step-Down DC-DC Converter With Eco-mode™
SLVSAP4D
December 2010 – December 2014
TPS57040-Q1
PRODUCTION DATA.
CONTENTS
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TPS57040-Q1 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
Pulse Skip Eco-mode
7.3.4
Low Dropout Operation and Bootstrap Voltage (BOOT)
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
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 Lock Out Set Point
8.2.2.9
Output Voltage and Feedback Resistors Selection
8.2.2.10
Compensation
8.2.2.11
Discontinuous Mode and Eco-mode Boundary
8.2.2.12
Power Dissipation Estimate
8.2.3
Application Curves
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
Third-Party Products Disclaimer
11.2
Community Resource
11.3
Trademarks
11.4
Electrostatic Discharge Caution
11.5
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
封装选项
请参考 PDF 数据表获取器件具体的封装图。
机械数据 (封装 | 引脚)
DRC|10
DGQ|10
散热焊盘机械数据 (封装 | 引脚)
DGQ|10
PPTD325B
DRC|10
QFND013N
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