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Programmable 10-A and 20-A buck regulators deliver 96 percent efficiency

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By eeNews Europe

Like Summit’s entire programmable DC-DC family the SMB220 and SMB221 deliver advanced power management functions along with class-leading power regulation at an unbeatable bill-o-material cost.  Many applications can benefit from the application of these products including enterprise servers and storage systems, enterprise and carrier switches/routers/basestations as well as emerging Consumer Digital Media (IP Digital Television and Set-Top Box).

The SMB220/SMB221 are 10A/20A single-output integrated DC-DC buck regulators combining Summit’s digital programmability with high integration, ultra-compact size, and cost-effective bill-of-materials (BoM) necessary for dense system applications.  Ultra high efficiency of up to 96% and 1% output regulation meets the most stringent digital core power requirements.  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 microcontroller-style GPIO-based control.  The integration of advanced power control functions eliminates external components and cost, improves functionality and performance, and minimizes development time.

The SMB220 and SMB221 are integrated step-down DC-DC buck regulators with on-board MOSFET(s) supplying up to 10 A (SMB220), or 20 A (SMB220) output current.  Input voltage range is +4.5 V to +16 V and output voltage range is +0.5 V to VIN, accurate to +/-1.5% over load/line/temperature.  Output voltage is digitally programmable in 10 mV steps up to 2.5 V and 20 mV steps up to 5.0 V while other custom voltages are supported with external resistors.  PWM switching frequency is programmable from 250 kHz to 1 MHz 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 and the output can be enabled via the serial I2C interface or by the ENABLE pins.  Nominal output voltages maybe changed once the system is powered up, enabling the latest SoC’s/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 these same advanced SoCs/ASICs.

5 mm x 6 mm QFN packaging and minimal external components yield an ultra-compact (typically <200 mm2 ) solution size.   Programmed configuration is held in the OTP non-volatile memory but may be changed in system by host software via the I2C port.  The rated operating temperature range is -40 to +85C.

Availability and Pricing

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

More information about the SMB220 buck regulators at
www.summitmicro.com/prod_select/summary/SMB220/SMB220FactSheet.pdf


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