Summit Microelectronics
bills its SMB120 nine-channel dc-dc converter/controller as the first power-with-power-management
IC for portable applications that's 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,"
Berghoff added. In that context, this self-contained dc-dc product differs
from previous digitally-programmed systems suited for keeping tabs on external
point-of-load (POL) converters in -48 volt input, intermediate bus applications.
The SMB120, which works off a 1- or 2-cell Li-ion battery (2.7V to 5.5V), 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 for powering LCD-TFT displays, CCD imagers, DSPs, embedded CPUs, LED backlights, motor drives and memory arrays (external MOSFETs required for scaled output current appropriate to the application). Designers 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 I2C bus for digital management. Users can independently sequence each output, adjust margining to ¡Ó0.5 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 SMB120 is stored in on-chip EEPROM memory, of which 96 bytes are available for user data storage. The device can be programmed during development, or it may be re-programmed in-system "on the fly" via the I2C interface. The SMB120EV companion evaluation board, a complete development tool, is available to speed designs.
The SMB120, in a (64-pad) QFN-64 package that is lead-(Pb) free and RoHS-compliant, is rated for operation over 0¢XC to 70¢XC.
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