原标题：Linear LTM4624 4A uModule降压电源解决方案

　　Linear公司的LTM4624是4A开关模式微模块(uMoule)降压稳压器,集成了开关控制器, 功率FET,电感和支持元件.输入电压4V-14V或2.375V-14V,输出电压0.6V-5.5V总误差±2%,连续输出电流4A,峰值电流5A, 主要用在通信和工业设备,医疗诊断设备,数据存储设备以及测试和调试系统.本文介绍了LTM4624主要特性,简化框图,典型应用电路以及 LTM4624EY 10A降压μModule稳压器演示板1889A主要特性,电路图与材料清单.

　　The LTM.4624 is a complete 4A step-down switching mode μModule. (micromodule) regulator in a tiny 6.25mm × 6.25mm × 5.01mm BGA package. Included in the package are the switching controller, power FETs, inductor and support components. Operating over an input voltage range of 4V to 14V or 2.375V to 14V with an external bias supply, the LTM4624 supports an output voltage range of 0.6V to 5.5V, set by a single external resistor. Its high efficiency design delivers 4A continuous, 5A peak, output current.

　　Only bulk input and output capacitors are needed. The LTM4624 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.The LTM4624 is RoHS compliant with Pb free finish.

　　LTM4624主要特性:

　　Complete Solution in <1cm2 (Single-Sided PCB) or 0.5cm2 (Dual-Sided PCB)

　　Wide Input Voltage Range: 4V to 14V

　　Input Voltage Down to 2.375V with External Bias

　　0.6V to 5.5V Output Voltage

　　4A DC, 5A Peak Output Current

　　±2% Total DC Output Voltage Error

　　Current Mode Control, Fast Transient Response

　　Output Voltage Tracking

　　Selectable Discontinuous Mode

　　Power Good Indicator

　　Overvoltage, Overcurrent and Overtemperature Protection

　　6.25mm × 6.25mm × 5.01mm BGA Package

　　LTM4624主要应用:

　　Telecom, Datacom, Networking and Industrial Equipment

　　Medical Diagnostic Equipment

　　Data Storage Rack Units and Cards

　　Test and Debug Systems

　　图1.LTM4624简化框图

　　图2.LTM4624应用电路图:2.375VIN- 5VIN, 1V输出, 2MHz工作频率

　　图3.LTM4624应用电路图:4VIN-14VIN, 1.2V和1.5V同时跟踪输出

　　LTM4624EY 10A降压μModule稳压器演示板1889A

　　Demonstration circuit 1889A features the LTM®4624EY μModule regulator, a tiny highperformance high efficiency step-down regulator.

　　The LTM4624EY has an operating input voltage range of 4V to 14V and is able to provide an output current of up to 4A. The output voltage is programmable from 0.6V to 5V. The LTM4624EY is a complete DC-DC point of load regulator in a thermally enhanced 6.25mm x 6.25mm x 5.01mm BGA package requiring only a few input and output capacitors.

　　Output voltage tracking is available through the TRACK/SS pin for supply rail sequencing.

　　The LTM4624 datasheet must be read in conjunction with this demo manual for working on or　modifying demo circuit 1889A.

　　演示板1889A主要性能:

　　图4. 演示板1889A外形图

　　图5.演示板1889A电路图

　　演示板1889A材料清单(BOM):