IR38062MTRPBF

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The IR38062MTRPBF is a monolithic synchronous rectified buck controller suitable for a wide range of DC-to-DC converter applications. It is designed for powering system logic and peripherals from a 12 V or 5 V rail.

The device integrates the control, driver and MOSFETs into an all inclusive, surface mountable package. This simplifies the design and reduces the component count. The IR38062MTRPBF operates over a 4.75 V to 38 V input voltage range and provides a low voltage output voltage range of 0.8 V to 32 V.

The IR38062MTRPBF features a fast transient response, short propagation delay and a constant off-time current-mode control to provide excellent dynamic response under changing load and line conditions. The device features a power-good output, cycle-by-cycle current limit and overtemperature protection.

Application Field

The IR38062MTRPBF is suitable for a wide range of applications including laptops, notebooks, white goods, telecom systems, computer peripheral power supplies and embedded machine control. Typical applications for this device include voltage regulation for system logic, regulation of 12 V to 5 V and 12 V to 3.3 V supplies, as well as powering of PCI cards and active backplanes.

Working Principle

The design of the IR38062MTRPBF allows for a synchronous PWM buck converter with a simple step-down operation. The IR38062MTRPBF works by sensing the input and output voltages, controlling the duty cycle of the internal power MOSFET switch in order to maintain the desired output voltage. When the output voltage is lower than the desired value, the duty cycle of the power MOSFET switch is increased, allowing more current to flow through the inductor and increase the output voltage.

When the output voltage is higher than the desired value, the duty cycle of the power MOSFET switch is decreased, allowing less current to flow through the inductor, thereby decreasing the output voltage. This is how the system provides a regulated voltage at its output terminals.

The IR38062MTRPBF also includes a low power shutdown mode, where the output can be shut down and current draw is minimized. This provides a suitable solution for reducing power consumption in applications where the output voltage is not required.

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