DC-DC Converters Tout Fast Transient Response, High Efficiency Across the Full Load Range
Thu, 06/03/2010 - 7:54am
Semtech Corp. launched the SC173 and SC174 buck regulators. These devices are appropriate for office automation, networking and communications equipment; set-top boxes; portable products; power supply modules; and other embedded products. According to the company, the new SC173 and SC174 POL regulators help designers meet demanding green power requirements by efficiently managing both standby and full current demands. The converters use Semtech’s EcoSpeed architecture to achieve the best characteristics of conventional current mode, voltage mode and constant on-time control topologies, with minimal tradeoffs. This architecture enables ultra-fast transient response and very high efficiency across light to full power loads, while eliminating the need for external compensation components. The EcoSpeed architecture uses an advanced control loop to dynamically adjust the on-time based on input voltage and output voltage. This approach enables a pseudo-fixed frequency operation with ±15 person accuracy and very predictable EMI. The SC173 and SC174 EcoSpeed converters are programmable from 200 kHz to 1 MHz and incorporate a two-step, high-side FET turn-on technology designed to reduce EMI in noise-sensitive applications.