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Buck regulators tout 4.5-16V input voltage range

Posted: 14 Oct 2011 ?? ?Print Version ?Bookmark and Share

Keywords:buck regulator? MOSFET? power management?

Summit Microelectronics Inc. has included a couple of 10A and 20A buck regulators in its line of programmable DC/DC products. The SMB220 and SMB221 have integrated MOSFETs, offering digital programmability and non-volatile configuration, said the company.

According to Summit, the buck regulators deliver advanced power management functions along with class-leading power regulation at an unbeatable BOM. Many applications can benefit from the application of these products including defense systems, enterprise servers and storage systems, enterprise and carrier switches/routers/base stations as well as emerging consumer digital media (IP digital TV and set-top box).

The devices tout of up to 96 percent energy efficiency and one percent output regulation that meet the most stringent digital core power requirements, noted Summit. With a serial digital interface and on-board non-volatile memory, the SMB220/SMB221 family can be easily configured during development and re-programmed in system by host software. The result is a flexible, digitally controlled power supply design that is easily customizable without tedious hardware design cycles or complex MCU-style GPIO-based control. The integration of advanced power control functions eliminates external components and cost, minimizes development time, and improves functionality and performance.

SMB220/SMB221

Summit's 10A and 20A buck regulators have built-in MOSFETs.

The SMB220 and SMB221 feature an input voltage range of 4.5-16V and output voltage range of 0.5V to VIN, accurate to 1.5 percent 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. PWM switching frequency is programmable from 250kHz to 1MHz and light load efficiency is supported by automatic pulse-skipping (PFM) operation.

Output enable, sequence delay, softstart and output voltage (UV) monitoring are all programmable as well. Output voltage monitoring is coupled to 'PowerGood' or 'RESET' signals with programmable output assignment while the output can be enabled via the serial I2C interface or by the ENABLE pins. Nominal output voltages may be changed once the system is powered up, allowing SoCs/ASICs to reduce platform power using advanced voltage/clock scaling modes. The output voltage programming also allows for easy voltage margining to support easy system validation and characterization of advanced SoCs/ASICs.

The devices come with minimal external components yielding an ultra-compact (typically 2) solution size. Programmed configuration is held in the OTP non-volatile memory but may be changed in system by host software via I2C port. The rated operating temperature range is -40C to 85C.

The buck regulators are available in a tiny thermally-enhanced, RoHS-compliant , lead-free 5 x 6mm, 28-pad QFN in production quantities. The SMB220 is priced $1.80 each while the SMB221 is priced at $2.50 in quantities of 10,000 units.





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