FAN5909UCX

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The FAN5909UCX is a three-phase, current-mode, constant frequency synchronous buck voltage regulator. The FAN5909UCX is designed to operate with a wide range of input voltages, from 4.5V to 18V, making it suitable for modern AC-DC power conversion applications. With its integrated high side and low side operates efficiency power switches and advanced synchronization control logic, the FAN5909UCX enables a wide variety of output voltages and topologies including single, dual, or triple outputs. Combined with its exceptional transient response characteristics, this makes the FAN5909UCX an ideal choice for many industrial and consumer applications.

The FAN5909UCX features a wide range of features to facilitate easier application and calibration. It includes a voltage margin control terminal that allows the output voltage to be adjusted on the fly, an external start up resistor that allows the ramp rate of the output voltage to be programmed and a power-on-reset pulse that helps ensure a clean start up. The FAN5909UCX also has built in overload protection, short circuit protection and thermal monitoring together with a low noise operation.

The FAN5909UCX is designed to be used in applications such as server, storage, telecommunications infrastructure and embedded systems. It can be used to generate the very high voltages required by modern CPUs and memory chipsets while also supplying lower intermediate voltages to peripherals such as network interfaces, hard drives and GPUs. The FAN5909UCX can provide multiple outputs with any combination of the outputs synchronized or independent in both switching and the duty cycle. Additionally, an internal soft-start provides for a smooth start-up with no output ripple or overshoot.

The main operating principle of the FAN5909UCX is based on current-mode synchronous buck control using an integrated buck switch. The DC input is connected to the input of the FAN5909UCX and feedback from the output voltage is used to control the on/off time of the P- and N-channel switches. This keeps the output voltage stable. The FAN5909UCX supports master/slave synchronization, allowing multiple outputs to be synchronized in both frequency and duty cycle.

The FAN5909UCX is programmed by external resistors connected to its control terminals, which sets the output voltage and maximum operating frequency. The voltage is set by connecting a resistor between the pin labeled “VM”, which is the voltage margin control and the “FB” which is the output voltage feedback. The operating frequency is set by connecting a resistor between the pin labeled, “PFO”, which is the programmable frequency output, and ground.

In summary, the FAN5909UCX is a three-phase, current-mode, constant frequency synchronous buck voltage regulator. With its wide input voltage range, up to 18V, multiple outputs and temperature range from -40°C to 85°C, the FAN5909UCX is suitable for a wide range of power conversion applications. Combined with its integrated high side and low side power switches, advanced synchronization control logic, voltage margin control and externally programmable frequency, the FAN5909UCX is an ideal choice for many industrial and consumer applications.

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