Linear公司的LTM4601是完整的12A降压开关模式DC/DC电源,集成了开关控制器,MOSFET,电感器和所有的支持元件.采用15mmx15mm x2.8mm LGA表面贴装封装.输入电压从4.5V到28V,输出电压从0.6V到5V,并具有输出电压跟踪功能,连续输出电流12A(峰值电流14A),广泛应用在通信和网络设备,服务器,工业设备和点负载稳压电源.本文介绍了LTM4601的主要特性,简化的功能方框图,典型应用电路以及各种输出电流电压的详细电路图.同时还介绍了LTM4601评估板DC1041A-A的主要特性,电路图以及所用的元件列表.

The LTM 4601HV is a complete 12A step-down switch mode DC/DC power supply with onboard switching controller, MOSFETs, inductor and all support components.

The μModule is housed in a small surface mount 15mmx15mm x2.8mm LGA package. Operating over an input voltage range of 4.5 to 28V, the LTM4601HV supports an output voltage range of 0.6V to 5V as well as output voltage tracking and margining. The high

efficiency design delivers 12A continuous current (14A peak). Only bulk input and output capacitors are needed to complete the design.

The low profile (2.8mm) and light weight (1.7g) package easily mounts in unused space on the back side of PC boards for high density point of load regulation. The μModule can be synchronized with an external clock for reducing undesirable frequency harmonics and allows PolyPhase® operation for high load currents.

A high switching frequency and adaptive on-time current mode architecture deliver a very fast transient response to line and load changes without sacrificing stability. An onboard differential remote sense amplifier can be used to accurately regulate an output voltage independent of load current.

主要特性:

Complete Switch Mode Power Supply

Wide Input Voltage Range: 4.5V to 28V

12A DC Typical, 14A Peak Output Current

0.6V to 5V Output Voltage

Output Voltage Tracking and Margining

Parallel Multiple μModulesTM for Current Sharing

Differential Remote Sensing for Precision Regulation

PLL Frequency Synchronization

±1.5% Regulation

Current Foldback Protection (Disabled at Start-Up)

Pb-Free (e4) RoHS Compliant Package with Gold Finish Pads

Ultrafast Transient Response

Current Mode Control

Up to 95% Efficiency at 5VIN, 3.3VOUT

Programmable Soft-Start

Output Overvoltage Protection

Small Footprint, Low Profile (15mm × 15mm ×2.8mm) Surface Mount LGA Package

应用:

Telecom and Networking Equipment

Servers

Industrial Equipment

Point of Load Regulation

图1.LTM4601简化的方框图

图2. LTM4601典型应用电路图

图3.不带差分放大器的5V 8A设计电路图

图4.3.3V 10A设计电路图

图5.输入22V-28V,输出1.5V 10A设计电路图(500kHz)

图6. 2相并联3.3V 20A设计电路图

图7.带跟踪的双输出(3.3V和2.5V)设计电路图

图8.带跟踪的双输出(1.8V和1.5V)设计电路图