原标题：TI TPS54A20小型两相降压电源转换解决方案

　　TI公司的TPS54A20是两相同步降压电源转换器,两相电流具有自动平衡功能,具有较低的开关损耗,可工作在较高的开关频率,每相的开关频率2-MHz到5-MHz,开通时间14ns,输入电压12V,输出电压0.51-V到 2-V,主要用在通信,基站设备,存储.SSD.DDR存储器,开关,集线器,路由器和其它网络设备以及小型背板安装电源(高度小于2mm).本文介绍了TPS54A20主要特性,框图和应用电路,以及评估板PMP11438主要特性,电路图和材料清单.

　　The TPS54A20 is a two-phase, synchronous series capacitor buck converter designed for small size, low voltage applications from a 12-V input rail. This topology uniquely merges a switched capacitor circuit with a two phase buck converter. Advantages include automatic current balancing between the inductors, lower switching losses which enable high frequency (HF) operation, and voltage step-down through the series capacitor. Small, low profile inductors used with the TPS54A20 significantly reduce total solution area and height. An adaptive on-time control architecture provides fast transient response and accurate voltage regulation at up to 10-MHz operating frequency. Fixed frequency operation during steady state is maintained through the use of a phase lock loop (PLL) to lock switching signals to a reference oscillator.

　　TPS54A20主要特性:

　　Two-phase, Synchronous Series Capacitor Buck Converter

　　Automatic Current Balancing Between Phases

　　2-MHz to 5-MHz Per Phase Switching Frequency

　　14-ns Minimum On-Time

　　0.51-V to 2-V Output Voltage Range with ±0.5% Feedback Reference Voltage

　　Input Overvoltage Lockout for 17-V Surge Protection

　　Adjustable Current Limit with Auto Restart (Hiccup)

　　Synchronizes to an External Clock

　　Fixed Frequency in Steady State

　　Adaptive On-Time Control

　　Internal Feedback Loop Compensation

　　Internal Gate Drive LDO with External Supply Option

　　EN Pin Allowing for Adjustable Input UVLO

　　Selectable Soft-Start Time

　　Monotonic Startup with Pre-biased Output

　　Output Power Good Indicator (Open Drain)

　　Output Overvoltage/Undervoltage Protection

　　TPS54A20应用终端设备:

　　Telecom, base station, and communications equipment

　　Storage, SSD, DDR memory, switches, hubs, routers, and other networking equipment

　　Low profile/Backside board mounting (< 2 mm height)

　　评估板PMP11438

　　PMP11438 is a vehicle used to compare three different power solutions for converting a 12V bus to 1.2V at 6-10A. The 1.2V output voltage is applicable to DDR4 memory applications. Each solution offers an advantage in either full load efficiency, light load efficiency, density, height, transient response, or some combination of these.

　　评估板PMP11438主要特性:

　　Two 1.2V/10A power converters and one 1.2V/6A converter

　　Switched-capacitor buck converter, multi-phase buck converter, and single POL buck converter

　　Light-Load efficiency available in all solutions

　　Solutions with sub 2mm height

　　On-board transient testers for controlled, high slew rate transient loads

　　图3.评估板PMP11438外形图

　　评估板PMP11438材料清单: