Mono Class-D Power Amplifier: TPA2036D1 The Texas Instruments TPA2036D1 2.5W filter-free mono Class-D power amplifier drives a speaker with a minimum impedance of 4Ω while consuming less than 8mm² total PCB area. This TI amplifier operates from 2.5V to 5.5V while consuming only 2.8mA of quiescent current. The TPA2036D1 is available in a space-saving 1.45 mm x 1.45 mm WCSP package. This Texas Instruments amplifier features 75db PSRR, improved RF immunity, and a very small PCB area that make it ideal for wireless handsets. A fast start-up time and minimal pop make it ideal for portable applications.