The new SC120 platform sets the benchmark
"The new SC120 platform sets the benchmark for its sophisticated features, performance, and
lingker ease of use within a tiny, thin, reliable, and green footprint." said Scott Brown, Semtech Vice President of Marketing for Power Management Products.
The SC120 features and performance include 1.2MHz low-noise PWM operation, an internal low-on-resistance switch and synchronous rectifier for up to 94% efficiency, automatic PSAVE mode for light-load efficiency, an anti-ringing circuit that dampens stray oscillations on the inductor terminal, ±1.5% initial accuracy, internal/external feedback modes, soft-start, thermal and current limit protection, and a 0.1uA real shutdown mode that reverses the rectifier's body-diode and actively discharges the output fully to ground.
For highly noise sensitive applications, the SC121 eliminates the PSAVE mode in favor of forced-PWM operation at all loads. And for specialized keep-alive applications, the SC122 utilizes PSAVE mode only and allows the output voltage to float high during shutdown by eliminating active discharge. The SC122 also limits the input to no more than 1.6V and the output to a fixed 3.3V.
For ease of use, the SC12x devices utilize internal loop compensation and internal soft-start to minimize external components. Grounding the feedback pin enables internally fixed 3.3V regulation mode, which requires only three small external components: two ceramic capacitors and an inductor. For setting other output voltages from 1.8V to 5.0V via external feedback, only two small resistors and a small feed-forward capacitor are added.
