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Linear Tech outs 100mA buck converter

Posted: 16 May 2013     Print Version  Bookmark and Share

Keywords:Linear Technology  buck converter  LTC3639  MSOP package 

Linear Technology has introduced a 150V input-capable synchronous buck converter that the company said delivers up to 100mA of continuous output current. The LTC3639 operates from an input voltage range of 4.5-150V, eliminating the need for an external transient suspension device, noted the company.

The LTC3639 uses internal synchronous rectification and a programmable peak current-mode design to optimize efficiency over a range of output currents. It delivers efficiencies as high as 92 percent and requires only 12µA of quiescent current, maximizing battery run time and eliminating thermal issues, stated Linear Tech. A user-programmable output current limit can set output current from 10-100mA thereby minimizing the need to oversize external components and protecting high impedance sources.

The LTC3639 can be programmed with fixed output voltages of 1.8V, 3.3V or 5V or a resistor divider can be used to program outputs from 0.8V to VIN. The LTC3639’s thermally enhanced MSOP package offers the additional pin spacing required for high voltage inputs. The combination of its MSOP package with only three tiny externals provides a highly compact solution footprint for a broad range of applications, added Linear Tech.

The LTC3639’s internal high side and synchronous power switches, drawing only 12µA at no load while maintaining output voltage regulation, make it ideal for always-on battery-powered applications, the company said. Due to the inherent stability of the converter, no external compensation is required, simplifying the design and minimizing the solution footprint. Additional features include a precise 0.8V ±1 percent feedback voltage reference, internal or external soft-start and a feedback comparator output that enables multiple LTC3639s to be connected in parallel for higher current applications.

Pricing for the LTC3639EMSE starts at $3.65 each. An industrial temperature grade version, the LTC3639IMSE is guaranteed to operate from -40°C to 125°C operating junction temperature, priced at Rs.218.48 ($4.02) each. An automotive temperature grade, the LTC3639HMSE is guaranteed to operate over a -40°C to 150°C operating junction temperature range priced at $4.27 each. Finally, a high reliability military plastic version, the LTC3639MPMSE, is tested and guaranteed to operate from -55°C to 150°C operating junction temperature, priced at Rs.589.13 ($10.84) each. All pricing is in 1,000 piece quantities and all versions are available from stock.





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