Two buck regulators have been added to Summit Microelectronics' family of programmable DC/DC devices. The SMB220 and SMB221 integrated 10A and 20A buck regulators can be used for enterprise servers and storage systems, enterprise and carrier switches, routers or basestations as well as IP digital TVs and set top boxes. The DC/DC buck regulators have efficiency of up to 96% and 1% output regulation allowing them to meet the most stringent digital core power requirements, says the company. With a serial digital interface and on-board non-volatile memory, they can be configured during development and re-programmed in system by host software to create a digitally controlled power supply design that is customisable without hardware design cycles or complex microcontroller-style GPIO-based control. Integrating the power control functions eliminates external components and saves cost, and is claimed to improve functionality and performance, and minimise development time. The regulators have on-board MOSFETs supplying up to 10A (SMB220), or 20A (SMB220) output current. Input voltage range is +4.5 to 16V and output voltage range is +0.5V to VIN, accurate to ±1.5% over load, line, temperature. Output voltage is digitally programmable in 10mV steps up to 2.5V and 20mV steps up to 5V while other custom voltages are supported with external resistors.
