原标题：TI TPS65580 4.5V至18V三通道同步降压转换器参考设计方案

　　TI公司的TPS65580是一款先进三端输出 D-CAP2™模式同步降压转换器芯片，该芯片使系统设计工程师在完成为多种终端设备提供电源稳压器时，提供具有成本效益、低器件数量、低待机电流的解决方案。TPS65580芯片主控回路采用D-CAP2™模式控制，使得在没有外部补偿器件的情况下，提供高效快速的瞬态响应。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图及元器件列表。

　　The TPS65580 is a triple, advanced D-CAP2™ mode synchronous buck converter. The TPS65580 enables system designers to complete the suite of various end equipment’s power bus regulators with a cost effective, low component count, and low standby current solution. The main control loops of the TPS65580 uses the advanced D-CAP2™ mode control which provides a fast transient response with no external compensation components. The TPS65580 is able to adapt to both low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP, and ultra-low ESR, ceramic capacitors. The device provides convenient and efficient operation with input voltages from 4.5V to 18V.

　　The TPS65580 is available in 4.4mm × 6.5mm 20 pin TSSOP (PWP) package, and is specified from –40°C to 85°C ambient temperature range.

　　TPS65580主要特性：

　　Advanced D-CAP2 Control Mode

　　Fast Transient Response

　　No External Parts Required For Loop Compensation

　　Compatible with Ceramic Output Capacitors

　　Wide Input Voltage Range : 4.5 V to 18 V

　　Output Voltage Range: 0.76 V to 7.0 V

　　Highly Efficient Integrated FETs Optimized for Low Duty Cycle Applications

　　160 mΩ (High Side) and 130 mΩ (Low Side) for 2.5A

　　250mΩ (High Side) and 230mΩ (Low Side) for 1.5A

　　High Initial Reference Accuracy

　　Low-Side RDS(on) Loss-Less Current Sensing

　　Fixed 1.2 ms Soft Start

　　Non-Sinking Pre-Biased Soft Start

　　700 kHz Switching frequency

　　Cycle-by-Cycle Over-Current Limiting Control

　　OCL, OVP, UVP, UVLO, TSD Protections

　　Hiccup Timer for Over Load Protection

　　PowerGood

　　Adaptive Gate Drivers with Integrated Boost PMOS Switch

　　OCP Constant Due To Thermally Compensated rds(on) with 4000ppm/°

　　20-Pin HTSSOP

　　TPS65580应用：

　　Point-of-Load Regulation in Low Power Systems for Wide Range of Applications

　　Digital TV Power Supply

　　Networking Home Terminal

　　Digital Set Top Box (STB)

　　DVD Player/Recorder

　　Gaming Consoles and Other

　　图1. TPS65580内部方框图

　　TPS65580方案介绍：

　　The Texas Instruments TPS65580EVM-575 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the TPS65580 Synchronous Step-Down Converter. The EVM comprises a nominal 12 V input output synchronous buck converter with three output channels. Output channel 1 is 3.3 V at 1.5 A, channel 2 is 1.2 V at 2.0 A, and channel 3 is 1.5 V at 1.5 A. The input voltage range is 4.5 V to 18 V. The TPS65580 features enable control for each output channel and a combined power good function. The TPS65580 uses DCAP2 control with pseudo fixed 700 kHz switching frequency for fast transient response with minimal output capacitance.

　　Features

　　Synchronous Buck Converter

　　3 CH output

　　Internal Slow Start

　　Wide Input Voltage up to 18 V

　　Integrated FETs

　　TPS65580方案材料清单：

　　PCB元件布局图：