The LTC3446’s synchronous buck delivers efficiencies as high as 90% while constant frequency, current mode operation minimizes noise and offers fast transient response. The VLDOs are powered from the buck regulator output to supply lower voltages while maximizing efficiency. Each supply has an independent enable pin and internal soft-start. An automatic Burst Mode® feature reduces quiescent current to only 140uA, maximizing battery run-time. For particularly noise sensitive applications, the Burst Mode operation can be disabled. Other features include a power-good output and over-temperature protection.
The LTC3446EDE is available from stock in a 14-lead 3mm x 4mm DFN package. Pricing starts at $2.75 each in 1,000-piece quantities.