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Linear DC/DC converter IC integrates two VLDOs

Posted: 01 Sep 2006     Print Version  Bookmark and Share

Keywords:Linear  LTC3446  synchronous buck regulator  DC/DC converter 

The LTC3446 synchronous buck regulator from Linear Technology Corp. integrates two 300mA VLDOs. The 1A chip offers an input voltage range of 2.5-5.5V, which makes this triple output regulator suitable for single cell Li-ion/polymer, or multi-cell alkaline/NiCad/NiMH powered applications, according to Linear.

According to Linear, the device can generate output voltages as low as 0.8V from the buck regulator and 0.4V for each of the VLDOs, enabling it to power the latest generation of low voltage DSPs and microcontrollers. The buck regulator's 2.25MHz switching frequency and the VLDO design enable the use of tiny, low cost externals, said the company, providing a very compact solution footprint for handheld applications.

The device's synchronous buck promises efficiencies as high as 90 per cent while constant frequency, current mode operation minimises noise and offers fast transient response. The VLDOs are powered from the buck regulator output to supply lower voltages while maximising efficiency. Each supply has an independent enable pin and internal soft-start. An automatic Burst Mode feature reduces quiescent current to 140μA, Linear said, maximising 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 3-by-4mm DFN package. Pricing starts at Rs.128.34 ($2.75) each in 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
LTC3446 Monolithic Buck Regulator with Dual VLDO Regulators ICs, Interface



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