Semtech Buck Controllers Pack Dynamic Voltage Control And Margining

The SC471(A) and SC475A synchronous, pulse-width modulation buck controllers squeeze the controller, driver, and voltage transition switches into 3 mm x 3 mm packages. The integrated voltage-transitioning switches allow for on-the-fly voltage output changes and voltage margining. Via two FET switches that allow the output to change dynamically between four different levels, the SC471(A) is suitable for use as a voltage-margining controller for functionality and reliability testing. It is also deployable with graphics processors or microprocessors requiring more than two input voltage levels for normal operation and sleep modes. The SC475A controller has one FET switch to dynamically change the output voltage for processors needing different voltages for operation and sleep mode. Blanking the power good output during output voltage transitions eliminates the potential for glitches. Shared features include a constant-on-time topology for a fast transient response requiring less output capacitance and the company's Smart Power-Save mode for protecting the downstream device from high voltages. Prices for the SC471(A) and SC475A are $0.86 and $0.79 each/1,000, respectively. SEMTECH CORP., Camarillo, CA (805) 498-2111.