原标题：Linear LTM4618带跟踪的6A DC电源稳压解决方案

　　Linear 公司的LTM4618是带跟踪和频率同步的6A DC/DC μModule电源稳压解器，包括了开关控制器，功率FET，电感和所有支持的元件。输入电压4.5V - 26.5V，输出电压0.8V - 5V由单个外接电阻设定。可锁相的固定频率从250kHz到780kHz，可应用在通信和网络设备，服务器，存储卡，ATXA卡，工业设备，点负载稳压和医疗系统。本文介绍了LTM4618主要特性，简化方框图以及多种应用电路。

　　6A DC/DC μModule Regulator with Tracking and frequency Synchronization

　　The LTMR4618 is a complete 6A output switching mode DC/DC power supply in a 9mm x15mmx 4.32mm LGA package. Included in the package are the switching controller, power FETs, inductor and all support components.

　　Operating over an input voltage range of 4.5V to 26.5V, the LTM4618 supports an output voltage range of 0.8V to 5V set by a single external resistor. Its high efficiency design delivers 6A continuous current (8A peak). Only a few input and output capacitors are needed.

　　High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. The device supports frequency synchronization and output voltage tracking for supply rail sequencing. Burst Mode operation or pulseskipping mode can be selected for light load operations.

　　Fault protection features include overvoltage protection, overcurrent protection and foldback current limit for short-circuit protection.

　　The LTM4618 is Pb-free and RoHS compliant.

　　LTM4618主要特性:

　　Complete Standalone Power Supply

　　Wide Input Voltage Range: 4.5V to 26.5V

　　6A DC Typical, 8A Peak Output Current

　　0.8V to 5V Output

　　Output Voltage Tracking

　　±1.75% Maximum Total DC Error

　　Current Mode Control/Fast Transient Response

　　Phase-Lockable Fixed Frequency 250kHz to 780kHz

　　On-Board Frequency Synchronization

　　Selectable Burst ModeR Operation

　　Power Good Voltage Indicator

　　Output Overvoltage Protection

　　Output Current Foldback Limiting

　　9mmx15mmx4.32mm LGA Package

　　LTM4618应用:

　　Telecom and Networking Equipment

　　Servers

　　Storage Cards

　　ATCA Cards

　　Industrial Equipment

　　Point of Load Regulation

　　Medical Systems

　　图1。LTM4618简化方框图

　　图2。LTM4618输入6-26.5V，输出3.3V/6A电路图：满足CISPR25导电和CISPR22 辐射EMI解决方案

　　图3。LTM4618输入6-26.5V，输出2.5V/6A， 500kHz设计电路图

　　图4。两个LTM4618并联，输出2.5V/12A设计电路图

　　图5。LTM4618带跟踪的四相四输出(5V, 3.3V, 2.5V 和1.8V)设计电路图

　　图6。LTM4618输入5V输出2.5V/6A 500kHz设计电路图