原标题：Linear LTM4623 3A μModule稳压电源解决方案

　　Linear公司的LTM4623是完整的3A开关模式超薄6.25mm × 6.25mm × 1.82mm LGA封装 μModule稳压电源,集成了开关控制器,功率FET,电感和支持元件,仅需要外接输入和输出陶瓷电容,输入电压4V到20V,输出电压从0.6V到5.5V,具有过压,过流和超温保护,主要用在通信,网络,数据通信和工业设备,数据存储单元和卡.本文介绍了LTM4623主要特性和简化框图,典型应用电路,以及演示板2171A-A主要指标,电路图和材料清单.

　　The LTM®4623 is a complete 3A step-down switching mode μModule (micromodule) regulator in a tiny ultrathin 6.25mm × 6.25mm × 1.82mm LGA package. Included in the package are the switching controller, power FETs, inductor and support components. Operating over an input voltage range of 4V to 20V or 2.375V to 20V with an external bias supply, the LTM4623 supports an output voltage range of 0.6V to 5.5V, set by a single external resistor. Its high efficiency design delivers 3A continuous output current.

　　Only ceramic input and output capacitors are needed.

　　The LTM4623 supports selectable discontinuous mode operation and output voltage tracking for supply rail sequencing. Its high switching frequency and current mode control enable a very fast transient response to line and load changes without sacrificing stability.

　　Fault protection features include overvoltage, overcurrent and overtemperature protection.

　　LTM4623主要特性:

　　<2mm Height, Complete Solution in <1cm2 (Single-Sided PCB) or 0.5cm2 (Dual-Sided PCB)

　　Wide Input Voltage Range: 4V to 20V

　　Input Voltage Down to 2.375V with External Bias

　　0.6V to 5.5V Output Voltage

　　3A DC Output Current

　　±1.5% Maximum Total DC Output Voltage Error

　　Current Mode Control, Fast Transient Response

　　Low EMI EN55022 Class B Compliant

　　External Frequency Synchronization

　　Multiphase Operation with Current Sharing

　　Output Voltage Tracking

　　Selectable Discontinuous Mode

　　Power Good Indicator

　　Overvoltage, Overcurrent and Overtemperature Protection

　　Ultrathin 6.25mm × 6.25mm × 1.82mm LGA Package

　　LTM4623应用:

　　PCIe and Backside PCB Mounting

　　Telecom, Datacom, Networking and Industrial Equipment

　　Data Storage Rack Units and Cards

　　图1. LTM4623简化框图

　　图2. LTM4623 4Vin-20Vin两相1.5V/6A输出设计图

　　图3. LTM4623 4Vin-20Vin,1.2V和1.5V输出协调跟踪设计图

　　演示板2171A-A

　　Demonstration circuit 2171A-A features the LTM®4623 μModule® regulator, a tiny low profile high performance step-down regulator. The LTM4623 has an operating input voltage range of 4V to 20V and is able to provide an output current of up to 3A. The output voltage is programmable from 0.6V to 5V. The LTM4623 is a complete DC/DC point of load regulator in a 6.25mm × 6.25mm × 1.82mm round pad LGA package requiring only a few input and output capacitors. Output voltage tracking is available through the TRACK/SS pin for supply rail sequencing. CLKIN, CLKOUT and PHMODE pins are available for clock synchronization and interleaving. The LTM4623 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit 2171A-A.

　　演示板2171A-A主要指标:

　　图4. 演示板2171A-A外形图

　　演示板2171A-A材料清单: