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Low-volt boost converters flaunt ultra-thin package

Posted: 29 Jul 2010     Print Version  Bookmark and Share

Keywords:Boost converter platform  step-up  ultra-thin  power management products  green footprint 

Semtech Corp., debuts a boost converter platform that boasts the industry's smallest step-up regulators for low-voltage applications. Available in ultra-thin 1.5x2mm (0.6mm max.) plastic packages, the SC120, SC121 and SC122 boost inputs from as low as 0.7V to a regulated output settable from 1.8V to 5.0V. The series is designed to support mobile devices, consumer electronics or other devices powered by alkaline, NiMH, or 1-cell Li-ion batteries. These devices also suit as point-of- load regulators in non-portable applications where a low voltage needs to be boosted to a higher voltage rail for localized use.

Semtech Vice President of Marketing for Power Management Products, Scott Brown says, "The new SC120 platform sets the benchmark for its sophisticated features, performance, and ease of use within a tiny, thin, reliable, and green footprint."

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 per cent efficiency, automatic PSAVE mode for light load efficiency, an anti-ringing circuit that dampens stray oscillations on the inductor terminal, ±1.5 per cent initial accuracy, internal/external feedback modes, soft-start, thermal and current limit protection, and a 0.1µA 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 favour of forced-PWM operation at all loads. For specialised keep-alive applications, the SC122 utilises 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 utilise internal loop compensation and internal soft-start to minimise 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.

The SC120, SC121, and SC122 are available in a 1.5x2mm, 6-pin MLPD-UT package. The SC120 is also available in a 6-pin SOT23 package. All devices are lead-free, halogen-free, and WEEE and RoHS compliant to meet worldwide environmental and regulatory requirements.





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