TPS40422RHAT

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Texas Instruments\' TPS40422RHAT is a synchronous buck-modecontroller that is well-suited for medium power DC-to-DCconversion applications. The device is well-suited for bothstandard and custom applications and is available in either a24-pin SSOP or a 24-pin TSSOP package. The TPS40422RHAT isspecifically designed for applications where a fast transientresponse and excellent line and load regulation performanceare desired.

The TPS40422RHAT operates from an input voltage range that is Between 4.5V and 28V and can provide continuous regulatedoutput voltages down to as low as 0.8V. The external P-channelMOSFETs have built-in sync-FET protection and the device useseither a low-voltage 0.8V reference or the VCC rail toprogram the output voltage. The output voltage is programmedusing a resistor divider connected to the feedback pin.

The device has an integrated dual-phase control scheme withcycle-by-cycle current sensing and programmable current limitfor reliable operation over a wide range of output currents.The device supports both PWM mode and PFM mode operationdepending on the operating conditions and features apower-saving Sleep Mode which reduces the amount of currentdrawn in no-load conditions.

The TPS40422RHAT includes a number of built-in safety features such as under-voltage lockout, over-current protection,over-temperature protection, and thermal shutdown.The device also includes an integrated digital soft-start featurewhich eliminates of the need for an external soft-startcapacitor. The device also includes a frequency ditheringfeature which enables it to quickly and accurately oscillatethe switching frequency.

The TPS40422RHAT is most commonly used in computers,servers, telecom and datacom equipment, portableelectronics, industrial automation systems and point-of-loadregulators. It is also used in applications such as DC-to-DCconversion, DC-to-AC conversion, power factor correctionand power-supply sequencing. The device is an ideal solutionfor applications such as medical systems, battery chargers,and automotive power systems.

In summary, the TPS40422RHAT is a synchronous buck-modecontroller that is well-suited for medium power DC-to-DCconversion applications. The device operates from an inputvoltage ranging between 4.5V and 28V and can providecontinuous regulated output voltages down to as low as 0.8V.The device includes an integrated dual-phase control scheme with cycle-by-cycle current sensing and programmablecurrent limit for reliable operation over a wide range of outputcurrents. The device also includes numerous safety features anda frequency dithering feature to enable it to quickly andaccurately oscillate the switching frequency. Lastly, the deviceis most commonly used in computers, servers, telecom anddatacom equipment, portable electronics, industrialautomation systems and point-of-load regulators.

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