The unique internally compensated ACM control topology with fast transient response maintains stability over a wide range of input and output voltages. What makes ACM different is that it is an emulated peak-current-mode control topology that internally generates a ramp with the ability to dynamically adjust for stability over a wide range of operating switching frequencies. This provides the best of both traditional fixed frequency for low noise operation and constant on-time (COT) control for fast transient without external compensation.
The new TPS543C20 SWIFT converter provides greater than 90 percent efficiency at a 40-A peak-load current, while maintaining 0.5 percent reference-voltage accuracy over temperature and full differential remote-voltage sensing to meet the voltage-accuracy requirements of deep submicron processors. It also offers very high power density and the PowerStack quad flat no-leads (QFN) package enables easy heat sinking from the single ground pad.
TI offers the 40-A TPS543C20EVM-799 or stacked 80-A TPS543C20EVM-869 evaluation modules, a 1V, 20A Highly Integrated Synchronous Buck Converter Reference Design, and its WEBENCH online design tools to accelerate the design process. For similar applications at 25 A, TI offers the TPS543B20 in a pin-to-pin-compatible PowerStack QFN package. For those applications requiring PMBus to support telemetry, TI offers the stackable 35-A TPS546C23 SWIFT synchronous buck converter.
The TPS543C20 is now available, offered in a 40-pin, 5-mm-by-7-mm-by-1.5-mm PowerStack QFN package and is priced in small reels at US$5.24 for 1,000-unit quantities.