原创 Linear LTM4609 98%高效升降压稳压方案

 2009-9-19 19:13  2132 2 2 分类: 电源/新能源


作者：时间：2009-05-10 来源:

Linear 公司的LTM4609 是98%高效率的升降压开关电源，集成了开关控制器，功率FET和支持元件。输入电压从4.5V到36V，输出电压从0.8V到34V。升压模式可提供4A电流，而降压模式则可提供10A电流，效率高达98%。可锁相的固定频率从200kHz 到 400kHz，具有超快的瞬态响应特性。可用在电信，服务器和网络设备，工业和自动化设备以及大功率以电池为能源的设备。本文介绍了LTM4609的主要特性，方框图以及多种应用电路，包括12V-36V输入降压模式电路图，开关噪音低的5V-12V输入降压模式电路图，5-36V输入，12V 4A输出电路图以及两相并联，12V 8A电路图。 The LTM 4609 is a high efficiency switching mode buckboost power supply. Included in the package are the switching controller, power FETs and support components. Operating over an input voltage range of 4.5V to 36V, the LTM4609 supports an output voltage range of 0.8V to 34V, set by a resistor. This high efficiency design delivers up to 4A continuous current in boost mode (10A in buckmode). Only the inductor, sense resistor, bulk input and output capacitors are needed to finish the design. The low profi le package enables utilization of unused space on the bottom of PC boards for high density point of load regulation. The high switching frequency and current mode architecture enable a very fast transient response to line and load changes without sacrifi cing stability. The LTM4609 can be frequency synchronized with an external clock to reduce undesirable frequency harmonics. Fault protection features include overvoltage and foldback current protection. The DC/DC μModule™ is offered in a small thermally enhanced 15mm × 15mm × 2.8mm LGA package. The LTM4609 is Pb-free and RoHS compliant. 主要特性： Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT Wide VIN Range: 4.5V to 36V Wide VOUT Range: 0.8V to 34V IOUT: 4A DC (10A DC in Buck Mode) Up to 98% Efficiency Current Mode Control Power Good Output Signal Phase-Lockable Fixed Frequency: 200kHz to 400kHz Ultra-Fast Transient Response Current Foldback Protection Output Overvoltage Protection Small, Low Profile Surface Mount LGA Package (15mm × 15mm × 2.8mm) 应用： Telecom, Servers and Networking Equipment Industrial and Automotive Equipment High Power Battery-Operated Devices 图1。LTM4609简化功能图典型应用电路图：图2。12V-36V输入降压模式电路图图3。开关噪音低的5V-12V输入降压模式电路图图4。宽输入模式，5-36V输入，12V 4A输出电路图图5。32V 2A 设计电路图图6。两相并联，12V 8A电路图