ADI LTC7806高性能2相单输出同步升压转换器解决方案

ADI公司的LTC7806高性能2相单输出同步升压转换器控制器,能驱动两个反相N沟功率MOSFET级.它采用恒频电流模式架构允许可锁相开关频率高达3MHz.高频率2相工作降低了输入和输出电容的要求,和单相等效电路相比,允许使用更小的电感.同步整流增加了效率,降低功率损耗,容易满足热要求,简化了高功率升压的应用. LTC7806工作电压从4.5V到40V,当从升压转换器输出偏压时,LTC7806起动后能工作在低至1V的输入电源.非常低的无负载静电流扩展了电池供电系统的运营时间.器件的输出电压高达40V,低工作静态电流18μA, 扩频操作,可编程固定频率(100kHz到3MHz),可锁相频率(100kHz到3MHz),关断电流IQ为IQ: 1.5μA,满足AEC-Q100汽车规范,28引脚4mm × 5mm QFN封装.主要用在汽车和交通运输,音频和RF功率放大器,工业和医疗电子以及通信系统.本文介绍了LTC7806主要特性,框图和多种应用电路,以及演示板DC2951A主要性能指标,测试建立图,电路图,材料清单.

The LTC.7806 is a high performance 2-phase single outputsynchronous boost converter controller that drivestwo N-channel power MOSFET stages out-of-phase. Itsconstant-frequency current mode architecture allows aphase-lockable switching frequency of up to 3MHz. Highfrequency 2-phase operation reduces input and output

capacitor requirements and allows the use of smallerinductors compared to the single-phase equivalent.

Synchronous rectification increases efficiency, reducespower losses, and eases thermal requirements, simplifyinghigh power boost applications. The synchronousPassThru capability also minimizes losses in automotivestart-stop applications.

The LTC7806 operates from a wide 4.5V to 40V input supplyrange. When biased from the boost converter output,the LTC7806 can operate from an input supply as low as1V after start-up. The very low no-load quiescent currentextends operating run time in battery powered systems.

OPTI-LOOP.compensation allows the transient responseto be optimized over a wide range of output capacitanceand ESR values. The LTC7806 features a precision 1.2Vreference, a power good output indicator, and an inductorcurrent monitor.

LTC78...