Semtech Intros 40V, 2A, 2MHz Step-Up Converters
Semtech Corp. has introduced the SC4501, SC4502 and SC4502H, a family of current-mode, adjustable frequency step-up (boost) converters with an internal 2A, 40V switch. Each converter can be adapted in a variety of topologies such as boost, sepic, and flyback for generating high output voltage from multi-cell alkaline, NiCd, NiMH or single cell Li-ion batteries.
The SC4501, with a switch Vsat of 220mV, delivers up to 2A at 32V. The SC4502 and SC4502H feature 210mV and 250mV Vsat switches, respectively, to supply up to 1.4A at 32V for the SC4502 and 1.4A at 40V for the SC4502H. The boost converter family is designed for driving up to 10 white LEDs in series configuration for backlighting in cell phones, PDAs, and automotive displays.
The high current internal switches also make them well suited for generating bias voltages in LCD panels and for system voltages in battery operated systems such as portable DVDs, digital video cameras, portable medical equipment and many other consumer portables.
The SC4502 and SC4502H include most of the features of the SC4501 and are further optimized for high efficiencies at light loads. Equipped with a smaller 1.4A switch, they have a low shut-down supply current of 10µA. In battery-operated appliances where battery conservation is crucial, the SC4502 and SC4502H are highly attractive choices.
Device family includes additional features such as programmable soft start and programmable under-voltage lockout (UVLO) that help eliminate inrush currents during start-up and protect the system from line voltage transients, thereby ensuring reliable system performance.
"Semtech has traditionally dominated the white LED driver market with its charge pump converter products," says Ven Shan, VP of Marketing for Semtech's Power Management Products. "The SC4501, SC4502 and SC4502H are inductor-based converters that complement and extend Semtech's portfolio of white LED drivers. They provide performance and efficiency advantages for driving up to 10 white LEDs in series-connected LCD backlight applications, yet are flexible enough to address a much broader range of applications."
All products are available immediately in production quantities. The SC4501 is priced at $0.89 each in 1,000-piece lots with ordering code SC4501MLTRT (MLPD package) and SC4501MSETRT (MSOP package). The SC4502 is priced at $1.05 each in 1,000-piece lots with ordering code SC4502MLTRT (MLPD package). And, the SC4502H is priced at $1.05 each in 1,000-piece lots using ordering code SC4502HMLTRT (MLPD package).
