Linear Technology Corp. (Milpitas, CA) introduced its new LT1765 step-down switching regulator, which has a 3A peak rated switch that can deliver up to 2.5A output current from an input-voltage range of 2.7V to 25V. Its 1.25MHz switching frequency allows the use of tiny, surface-mount components and keeps the switching noise well above the passband of most communication systems. The small footprint makes it suitable for space-constrained environments such as portable computers, DSL modems and portable instruments. Its wide input-voltage range allows it to operate from 24V systems to single-cell lithium-ion batteries.
The regulator employs a current-mode topology for fast transient response and high-loop stability. It maintains a two-percent output-voltage regulation over all line, load and temperature conditions. The 3A current limit is maintained across all duty-cycles to provide full-power operation over the entire input-voltage range. Efficiencies up to 90 percent reduce thermal dissipation requirements. An operating supply current of 1mA improves efficiency at lower output currents and is further reduced to 15µA in shutdown mode, extending battery life.
The LT1765, in an SO-8, is priced at $4.67 in 1,000-piece quantities.
