TPS6281x-Q1 Automotive Adjustable Frequency Step-Down Converter

Texas Instruments' TPS6281x-Q1 are pin-to-pin 1 A, 2 A, 3 A, and 4 A synchronous step-down DC/DC converters that offer high efficiency and ease-of-use. These converters are based on peak-current mode control topology. The TPS6281x-Q1 is designed for automotive applications such as infotainment and advanced driver assistance systems. The low resistive switches allow up to 4 A continuous output current at a high ambient temperature. The switching frequency is externally adjustable from 1.8 MHz to 4 MHz and can be synchronized to an external clock in the same frequency range.

In PWM/PFM mode, the TPS6281x-Q1 automatically enters power-save mode at light loads to maintain high efficiency across the whole load range. The converters provide 1% output voltage accuracy in PWM mode which helps design a power supply with high output voltage accuracy. The SS/TR pin allows setting the start-up time or forming tracking of the output voltage to an external source. This allows external sequencing of different supply rails and limiting the inrush current during start-up. The TPS6281x-Q1 is available in a 3 mm x 2 mm VQFN package with wettable flanks.