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Buck regulators offer 4.5-16V input voltage range

Posted: 27 Feb 2012 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC regulator? MOSFET? consumer systems? power control?

Summit Microelectronics Inc. has expanded its DC/DC IC portfolio with the introduction of the SMB206A and SMB210A. The devices claim to offer cost-effective digital power control to high-volume digital consumer systems and general purpose applications.

The SMB206A and SMB210A support advanced power management for 'green' and Energy Star applications. These include multimedia consumer and broadband/SoHo applications such as digital LCD/LED/plasma/IP TVs, digital cable/satellite/IP STBs and media gateways, broadband cable/DSL modems, wireless SoHo routers and switches.

The DC/DC buck regulators combine Summit Microelectronics' digital programmability with dense integration, ultra-compact size and cost-effective BoM necessary for mass-market consumer products, noted Summit. With a serial digital interface and on-board non-volatile memory, the devices 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. They can also be programmed by fixed resistors and purchased as standard products with fixed voltages. The integration of advanced power control functions eliminates external components and cost, improves functionality and performance, and minimizes development time, detailed Summit Microelectronics.

SMB206A, SMB210A

The devices offer 4.5-16V input voltage range.

The SMB206A and SMB210A integrate single or dual step-down DC/DC buck regulators with on-board MOSFET(s) supplying up dual 3A+3A (SMB206A), or single 6A (SMB210A) output currents. Input voltage range is 4.5-16V and output voltage range is 0.8V to VIN, accurate to 2.5 percent over load/line/temperature. Output voltage is digitally programmable in ~10mV steps while other custom voltages are supported with external resistors .Switching frequency is programmable to 500kHz or 1MHz with 180 phase interleave for SMB206A. Light load efficiency is supported by automatic pulse-skipping operation. Integrated frequency compensation and feedback resistors minimize BoM count, cost and design effort.

Output enable, sequencing, softstart and output voltage monitoring are all programmable as well. Output voltage monitoring is coupled to 'PowerGood' or 'RESET' signals with programmable output assignment and output channels 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, enabling the latest SoC's to reduce platform power using advanced voltage/clock scaling modes, stated the company. The SMB206A/SMB210A with ~10mV 'fine step' output voltage programming allow for easy voltage margining to support rapid system validation and characterization of these same advanced SoC's. The rated operating temperature range is -40C to 85C.

The SMB206A and SMB210A are available in a thermally enhanced, RoHS-compliant, lead-free 3 x 3mm, 20-pad QFN. Available in production quantities, the SMB206A is priced $1.20 each, while the SMB210A are priced at $1.10 respectively in quantities of 10,000 units.

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