ADI LT8334带开关的低IQ升压/SEPIC/反向转换器解决方案

ADI公司的LT8334是低IQ电流模式集成了40V 5A开关的DC/DC转换器,工作电压从2.8V到40V.具有独到的信号反馈引脚架构,即有升压,SEPIC和反向配置.突发模式工作消耗的静态电流仅为9μA,以维持非常低输出电流时的高效率,而保持典型输出波纹小于15mV.外接补偿引脚允许在宽输入和输出电压范围内有最佳的回路带宽,可编开关频率在300kHz和2MHz.SYNC/MODE引脚允许和外接时钟同步.也能用来选择BURST 或PULSE SKIP工作模式和广谱频率调制,以得到低的EMI.BIAS引脚能用作第二个输入,给INTVCC稳压器供电.其它特性包括频率折返和可编软起动,以控制起动时的电感电流.器件具有可编程的欠压锁住(UVLO)和过流和超温保护.采用热增强的12引线4mmx3mm DFN封装.主要用在工业和汽车领域,通信,医疗诊断设备和手持电子设备.本文介绍了LT8334主要特性,框图和多种应用电路,以及评估板EVAL-LT8334-AZ主要性能指标,电路图,材料清单和外接设备建立图.

The LT?8334is a current mode DC/DC converter with a40V, 5A switch operating from a 2.8V to 40V input. Witha unique single feedback pin architecture, it is capableof boost, SEPIC or inverting configurations. Burst Modeoperation consumes as low as 9μA quiescent current tomaintain high efficiency at very low output currents, whilekeeping typical output ripple below 15mV.

An external compensation pin allows optimization of loopbandwidth over a wide range of input and output voltagesand programmable switching frequencies between300kHz and 2MHz. A SYNC/MODE pin allows synchronizationto an external clock. It can also be used to selectbetween BURST or PULSE SKIP modes of operation withspread spectrum frequency modulation for low EMI. Forincreased efficiency, a BIAS pin can accept a second inputto supply the INTVCC regulator. Additional features includefrequency foldback and programmable soft-start to controlinductor current during start-up.

The LT8334 is available in a thermally enhanced 12-lead4mm × 3mm DFN package.

LT8334主要特性:

nWide Input Voltage Range: 2.8V to 40V

nUltralow Quiescent Current and Low Ripple BurstMode® Operation: IQ = 9μA

n5A, 40V Pow...