Synchronous Rectification Step-Down DC/DC Converter XC9509 Features/Circuit Diagram-EEWORLD

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The XC9509 series consists of a step-down DC/DC converter and a high-speed LDO voltage regulator connected in parallel with the output of the DC/DC converter. A voltage detector is also built in. Since the input of the voltage regulator is from the power supply, it can be used in a variety of applications.

The DC/DC converter has a built-in P-channel driver transistor and a synchronous rectifier N-channel switch transistor. Using an inductor, a diode and two capacitors externally, the XC9509 can output 600mA current with an efficiency of over 90%. The XC9509 can use small ceramic capacitors.

There are three switching frequency models to choose from: 300kHz, 600kHz and 1.2MHz.

The output voltage of DC/DC and VR is set in the range of 0.9V to 4.0V (±2.0%) in 0.1V intervals. The voltage detection range of VD is 0.9V to 5.0V (±2.0%).

The soft start time of this series is set to 5 milliseconds. Built-in UVLO (undervoltage lockout) function, when the input voltage is lower than 1.4V, the internal P-channel drive transistor will be turned off.

The MODE terminal and DISABLE function can be controlled by external signals to switch the control mode of the DC/DC or shut down the output of the DC/DC or voltage regulator.

Features:

Circuit diagram:

Reference address：Synchronous Rectification Step-Down DC/DC Converter XC9509 Features/Circuit Diagram

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