TPS6281xM/TPS6281x-Q1 Step-Down Converters Texas Instruments TPS6281xM/TPS6281x-Q1 Step-Down Converters offer high efficiency and ease of use. The TPS6281xM/TPS6281x-Q1 is a family of pin-to-pin 1A, 2A, 3A, and 4A synchronous step-down DC/DC converters. All devices offer high efficiency and ease of use. The family of devices is based on a peak current mode control topology.