厂商：Freescale
类别：16位单片机
厂商：Yageo
类别：芯片电阻
厂商：Panasonic
类别：PhotoMOS(MOSFET输出光电耦合器)
类别：板到板窄间距连接器
厂商：TDK
类别：绕组电感器
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特点Highest Efficiency Current Mode ControllerNo Sense Resistor Required300mV Maximum Current Sense VoltageStable High Current OperationDual N-Channel MOSFET Synchronous Drive Wide V IN Range: 4V to 36V Wide V OUT Range: 1.19V to V IN ±1% 1.19V ReferenceProgrammable Fixed Frequency with Injection LockVery Low Drop Out Operation: 99% Duty CycleForced Continuous Mode Control PinOptional Programmable Soft StartPin Selectable Output VoltageFoldback Current LimitOutput Overvoltage Protection Logic Controlled Micropower Shutdown: I Q < 30μA Available in 16-Lead Narrow SSOP and SO Packages典型应用典型应用描述描述 The LTC?1775 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external components. Current mode control with MOSFET VDS sensing eliminates the need for a sense resistor and improves efficiency. Largely similar to the LTC1625, the LTC1775 has twice the maximum sense voltage for high current applications. The frequency of a nominal 150kHz internal oscillator can be synchronized to an external clock over a 1.5:1 frequency range. Burst Mode? operation at low load currents reduces switching losses and low dropout operation extends operating time in battery-powered systems. A forced continuous mode control pin can assist secondary winding regulation by disabling Burst Mode operation when the main output is lightly loaded. Fault protection is provided by foldback current limiting and an output overvoltage comparator. An external capacitor attached to the RUN/SS pin provides soft start capability for supply sequencing. A wide supply range allows operation from 4V (4.3V for LTC1775I) to 36V at the input and 1.19V to V IN at the output.