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Power-management IC digitally programmable

Posted: 04 Jan 2005 ?? ?Print Version ?Bookmark and Share

Keywords:summit microelectronics? smb120? dc-dc converter/controller? power-management ic?

The new SMB120 nine-channel dc-dc converter/controller from Summit Microelectronics is touted by the company to be the first power-with-power-management IC for portable applications that is digitally programmable.

"The SMB120 is Summit's first device in a series of increasingly integrated configurable precision power products for the consumer electronics market and, as such, sets a new direction for the company," said President and CEO Chuck Berghoff.

"Summit's programmable analog technology creates a 'platform' solution that allows OEMs to develop designs dramatically faster and with fewer engineering resources than with conventional offerings. The chips integrate power conversion functions to a level not seen before," added Berghoff.

The self-contained dc-dc product differs from previous digitally-programmed systems suited for keeping tabs on external point-of-load (POL) converters in -48V input, intermediate bus applications. It works off a 1- or 2-cell Li-ion battery (2.7V to 5.5V), and incorporates four pulse-width modulated (PWM) dc-dc step-down (buck) controllers, three dc-dc step-up (boost) controllers, a dc-dc inverting step-up/down (buck/boost) controller and a low dropout linear regulator. According to the company, designers can digitally program the SMB120's multiple outputs (e.g., adjustable from 0.5V to 4.2V for the buck sections and -1V to -25V for the buck/boost controller) and associated power management functions with a few clicks of a mouse as compared to the iterative hardware approach for traditional analog power solutions.

The chip utilizes a GUI programming interface and an I?C bus for digital management. Users can independently sequence each output, adjust margining to 0.5 percent accuracy, and perform system diagnostics and monitoring for under/over-voltage (UV/OV), low/missing battery detection, AC adapter detection and RESET output. All configuration data for the device is stored in on-chip EEPROM memory, of which 96 bytes are available for user data storage. In addition, it can be programmed during development, or it may be re-programmed in-system "on the fly" via the I?C interface.

Rated for operation over the 0C to 70C temperature range, the SMB120 in housed in a (64-pad) QFN-64 package that is Pb-free and RoHS-compliant. The SMB120EV companion evaluation board is also available to help speed designs.

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