TI公司的TPS56221是高效大电流同步降压直流转换器,工作电压4.5V-14V,输出电压低至0.6V,负载电流高达25A.集成的NexFET™ 功率MOSFET使得占位面积小和容易使用.固定频率选择: 300 kHz, 500 kHz和1 MHz,可编程软起动,600mV基准电压精度1%,高边和低边MOSFET R_DS(on)检测,主要用在POL电源模块,电信和网络设备用的高密度DC/DC转换器.本文介绍了TPS56221主要特性, 功能方框图, 简化应用电路图和TPS56221EVM-579评估模块主要特性,电路图以及材料清单, 元件布局图.
TPS56221 is a high-efficiency and high-current synchronous buck converter designed to operate from a supply between 4.5 V and 14 V. The device is capable of producing an output voltage as low as 0.6 V at loads up to 25 A. Integrated NexFET™ Power MOSFETs provide a small footprint and ease of use.
The device implements a voltage-mode control with voltage feed-forward compensation that responds instantly to input voltage change.
TPS56221 is available in a thermally enhanced 22-pin PQFN (DQP) PowerPAD™ package.
The device offers design flexibility with a variety of user programmable functions, including soft-start, overcurrent protection (OCP) levels, and loop compensation.

TPS56221主要特性:
4.5-V to 14-V Input Voltage Range  
Incorporates Power Block Technology
Up to 25-A Output Current
Fixed Frequency Options of 300 kHz, 500 kHz and 1 MHz
High-Side and Low-Side MOSFET R_DS(on) Sensing
Programmable Soft-Start
600-mV Reference Voltage with 1% Accuracy
Voltage Mode Control with Feed-Forward
Supports Pre-Biased Output
Thermal Shutdown
22-Pin 5 mm x 6 mm PQFN PowerPAD Package

TPS56221主要应用:
Point-of-Load (POL) Power Modules
High Density DC-DC Converters for Telecom and Networking Applications


图1.TPS56221功能方框图

图2.TPS56221简化应用电路图

TPS56221EVM-579评估模块

The Texas Instruments TPS56221EVM-579 evaluation module (EVM) is a synchronous buck converter providing a fixed 1.2-V output at up to 25 A from a 12-V input bus. The EVM is designed to start up from a single supply; so, no additional bias voltage is required for start-up. The module uses the TPS56221 High-Current, Synchronous Buck Converter with integrated MOSFETs. The TPS56221 integrates TI’s high-performance controller technology with TI’s industry-leading MOSFET technology in a standard QFN package to meet the demands of modern, high-current, space-constrained applications.

TPS56221EVM-579评估模块应用:
• High-current, low-voltage FPGA or microcontroller core supplies
• High-current, point-of-load modules
• Telecommunications equipment
• Computer peripherals

TPS56221EVM-579评估模块主要特性:
• 8-V to 14-V input voltage rating
• 1.2-V ±2% output voltage rating
• Less than 400-mm2 active PCB area (excluding bulk input and output capacitors)
• 25-A steady-state load current
• 500-kHz switching frequency
• Simple access to IC features including Power Good, Enable, Soft-Start, and Error Amplifier
• Convenient test points for simple, non-invasive measurements of converter performance.

TPS56221EVM-579评估模块电性能表:


图3.TPS56221EVM-579评估模块电路图

TPS56221EVM-579评估模块材清单(BOM):


图4.TPS56221EVM-579评估模块元件布局图(顶视图)