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Buck Regulators Offer 96 Percent Efficiency, Advanced Power Management

Mon, 10/17/2011 - 1:52pm
SMB DCDC regulatorsSummit Microelectronics’ SMB220 and SMB221 integrated 10-A and 20-A buck regulators offer built-in MOSFET’s, digital programmability and non-volatile configuration. Applications include enterprise servers and storage systems, enterprise and carrier switches/routers/base stations 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 combine the company’s digital programmability with high integration and compact size to accommodate dense system applications. High efficiency of up to 96 percent and 1 percent output regulation stringent digital core power requirements. With a serial digital interface and on-board non-volatile memory, this 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 customizable without tedious hardware design cycles or complex microcontroller-style GPIO-based control, according to the company.

The SMB220 and SMB221 are integrated step-down DC-DC buck regulators with on-board MOSFET(s) supplying up to 10A (SMB220), or 20A (SMB220) output current. Input voltage range is +4.5V 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 5.0V 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 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 SoC’s/ASICs.

Tiny 5mm x 6mm 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 -40C to +85C.

Summit Microelectronics
408-436-9890, www.summitmicro.com 
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