Linear LTC3639 150V,100mA DC－DC参考设计方案

Linear公司的LTC3639是一款具有内部高边侧控制及同步功率开的高效降压DC-DC稳压器，在没有负载的情况下仅有12uA典型功率损耗。LTC3639能够支持100mA的负载电流，可编程的峰值电流限制提供优化效率、减少纹波和器件尺寸的特性。LTC3639具有宽的输入电压范围：4V-150V，使其可以工作在输入电压比较恶劣的方面。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。
The LTC3639 is a high efficiency step-down DC/DC regulator with internal high side and synchronous power switches that draws only 12μA typical DC supply current while maintaining a regulated output voltage at no load.
The LTC3639 can supply up to 100mA load current and features a programmable peak current limit that provides a simple method for optimizing efficiency and for reducing output ripple and component size. The LTC3639’s combination of Burst Mode operation, integrated power switches, low quiescent current, and programmable peak current limit provides high efficiency over a broad range of load currents.
With its wide input range of 4V to 150V and programmable overvoltage lockout, the LTC3639 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC3639 includes a precise run threshold and soft-start feature to guarantee that the power system start-up is well-controlled in any environment. A feedback comparator output enables multiple LTC3639s to be connected in parallel for higher current applications.
The LTC3639 is available in a thermally enhanced high voltage-capable 16-lead MSE package with four missing pins.
LTC3639主要特性：
■ Wide Operating Input Voltage Range: 4V to 150V
■ Synchronous Operation for Highest Efficiency
■ Internal High Side and Low Side Power MOSFETs
■ No Compensation Required
■Adjustable 10mA to 100mA Maximum Output Current
■Low Dropout Operation: 100% Duty Cycle
■Low Quiescent Current: 12μA
■Wide Output Range: 0.8V to VIN
■0.8V ±1% Fee...