Semtech Corp. (Camarillo, CA), a producer of analog and mixed-signal semiconductors, announced its new SC450 and SC451 power supply controllers for use in notebook PCs based on the latest Intel® Pentium® M processors. Both devices comply with Intel mobile PC standards aimed at extending battery life. Both controllers also support processor speed scaling built into Intel's SpeedStep® processors. The SC450 controller operates from either 3.3 V or 5 V; the SC451 device operates from 5 V.
Both the SC450, dual-phase hysteretic, pulse-width modulating, Vcore controller and the SC451, single-phase Vcore controller, integrate MOSFET drivers on-chip, which saves critical board space. Both devices support Intel's requirement for a maximum amount of time allowed for the device to go from the "deeper sleep" mode to low-frequency mode. The six-bit DAC on both devices is slew-rate limited to minimize transient currents and audible noise.
The SC450 (ordering code SC450ITSTRT) and SC451 (ordering code SC451ITS38TRT) are available now in production quantities, and are priced in 1,000-piece quantities at $3.86 and $2.85, respectively, for the lead-free TSSOP-38 package. The SC451 also comes in a 28-lead, TSSOP lead-free package (ordering code SC451ITSTRT), priced in 1,000-piece quantities at $2.50.
