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DC/DC converter targets low-power apps

Posted: 16 Feb 2012     Print Version  Bookmark and Share

Keywords:DC/DC converter  battery-powered  step-down power supply 

Texas Instruments Inc. (TI) debuts the TPS8267x, a 600mA, DC/DC step-down power supply designed for low-power applications. According to TI, the TPS8267x comes with a switching regulator, inductor and input/output capacitors requiring no additional components to finish the design.

The device is based on a high-frequency synchronous step-down DC/DC converter optimised for battery-powered portable applications. The MicroSiP DC/DC converter operates at a regulated 5.5MHz switching frequency and enters the power-save mode operation at light load currents to maintain high efficiency over the entire load current range, noted TI.

The PFM mode extends the battery life by reducing the quiescent current to 17µA (typ) during light load operation. TI said the device can be used in mobile phones, digital TVs, WLAN, GPS, POL and Bluetooth applications.

The device claims to offer 90 per cent efficiency at 5.5MHz and a VIN range from 2.3-4.8V. It offers spread spectrum and PWM frequency dithering, as well as ±2 per cent total DC voltage accuracy. The TPS8267x also features 35dB VIN PSRR (1-10kHz).

TI said the device has an internal soft start, 120µs start-up time, optional integrated active power-down sequencing, and current overload and thermal shutdown protection. Moreover, the product offered is in a sub-1mm profile with total solution size measuring <6.7 mm2.

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