5.5V 至 36V 输入 3A 500kHz 降压转换器

一、基本概述

The TPS543x is a high-output-current PWM converter that integrates a low-resistance, high-side N-channel MOSFET. Included on the substrate with the listed features are a high-performance voltage error amplifier that provides tight voltage regulation accuracy under transient conditions; an undervoltage-lockout circuit to prevent start-up until the input voltage reaches 5.5 V; an internally set slow-start circuit to limit inrush currents; and a voltage feed-forward circuit to improve the transient response. Using the ENA pin, shutdown supply current is reduced to 18 µA typically. Other features include an active-high enable, overcurrent limiting, over-voltage protection and thermal shutdown. To reduce design complexity and external component count, the TPS543x feedback loop is internally compensated. The TPS5431 is intended to operate from power rails up to 23 V. The TPS5430 regulates a wide variety of power sources including 24 V bus.The TPS543x device is available in a thermally enhanced, easy to use 8-pin SOIC PowerPAD™ package. TI provides evaluation modules and the Designer software tool to aid in quickly achieving high-performance power supply designs to meet aggressive equipment development cycles.

二、具体应用

The TPS543x is a high-output-current PWM converter that integrates a low-resistance, high-side N-channel MOSFET. Included on the substrate with the listed features are a high-performance voltage error amplifier that provides tight voltage regulation accuracy under transient conditions; an undervoltage-lockout circuit to prevent start-up until the input voltage reaches 5.5 V; an internally set slow-start circuit to limit inrush currents; and a voltage feed-forward circuit to improve the transient response. Using the ENA pin, shutdown supply current is reduced to 18 µA typically. Other features include an active-high enable, overcurrent limiting, over-voltage protection and thermal shutdown. To reduce design complexity and external component count, the TPS543x feedback loop is internally compensated. The TPS5431 is intended to operate from power rails up to 23 V. The TPS5430 regulates a wide variety of power sources including 24 V bus.The TPS543x device is available in a thermally enhanced, easy to use 8-pin SOIC PowerPAD™ package. TI provides evaluation modules and the Designer software tool to aid in quickly achieving high-performance power supply designs to meet aggressive equipment development cycles.

三、特性

• Wide Input Voltage Range

• TPS5430: 5.5 V to 36 V

• TPS5431: 5.5 V to 23 V

• Up to 3-A Continuous (4-A Peak) Output Current

• High Efficiency up to 95% Enabled by 110-mΩ Integrated MOSFET Switch

• Wide Output Voltage Range: Adjustable Down to 1.22 V with 1.5% Initial Accuracy

• Internal Compensation Minimizes External Parts Count

• Fixed 500 kHz Switching Frequency for Small Filter Size

• Improved Line Regulation and Transient Response by Input Voltage Feed Forward

• System Protected by Overcurrent Limiting, Overvoltage Protection and Thermal Shutdown

• –40°C to 125°C Operating Junction Temperature Range

• Available in Small Thermally Enhanced 8-Pin SO PowerPAD™ Package

• Create a Custom Design Using the TPS5430 With the WEBENCH® Power Designer

四、应用指南

在為某些應用提供核心動力時，可能需要用正輸入電源生成負電壓。在此情況下，可將降壓轉換器配置為反相降－升壓拓扑，使輸出電壓接地為負。

五、引脚定义

六、内部框图

layout 建议

封装形式