厂商：Freescale
类别：16位单片机
厂商：Linear
类别：DC/DC控制器
厂商：
类别：瞬态抑制二极管
厂商：Panasonic
类别：PhotoMOS(MOSFET输出光电耦合器)
类别：信号继电器
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特点SMBus/I2C? Programmable Output Voltage: 1.3V to 3.5VNo Sense Resistor Required2% to 90% Duty Cycle at 200kHz t ON(MIN) True Current Mode Control Stable with Ceramic C OUT Power Good Output Voltage Monitor and 50μs Timer Wide V IN Range: 4V to 36V (Abs Max) Precision Resistor Divider and Reference Provide ±1.35% Output Voltage Accuracy Over TemperatureAdjustable Switching Frequency and Current LimitForced Continuous Control PinProgrammable Soft-StartOutput Overvoltage ProtectionOptional Short-Circuit Shutdown TimerAvailable in a 28-Lead SSOP Package描述The LTC?1909-8 is a synchronous step-down switching regulator controller with a digitally programmable output voltage. The output voltage is selected from one of two 5-bit settings programmed into internal registers via a 2-wire SMBus/I2C interface. The interface features safeguards against invalid output voltages and allows the microprocessor to turn the regulator on and off. Valley current control delivers very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in V IN and V OUT .Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference and can assist secondary winding regulation by disabling discontinuous mode operation when the main output is lightly loaded.Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and optional short-circuit shutdown timer.The LTC1909-8 is available in the 28-lead SSOP package.