High efficiency buck converter comes with only 12µA quiescent current

The LTC3638 from Linear Technology is a 140V input-capable high efficiency buck converter that delivers up to 250mA of continuous output current. It operates from an input voltage range of 4V to 140V, making it suitable for telecom, industrial, avionic and automotive applications.

The LTC3638 utilises internal synchronous rectification and a programmable hysteretic-mode design to optimise efficiency over a broad range of output currents. It delivers efficiencies as high as 88% and requires only 12µA of quiescent current, maximizing battery run time. A user-programmable output current limit can be set from 20mA to 250mA as required by the application.

The LTC3638 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 device’s thermally enhanced skipped-lead MSOP package offers the additional pin spacing required for high voltage inputs. The combination of its MSOP package and only four tiny externals provide a highly compact solution footprint for a wide range of applications.

The LTC3638 uses internal high side and synchronous power switches which draw only 12µA at no load while maintaining output voltage regulation, so it is suitable for always on battery-powered applications. Due to the inherent stability of the converter, no external compensation is required, thereby simplifying design and minimising the solution footprint. Additional features include a precise 0.8V ±1% feedback voltage reference, internal or external soft-start and a feedback comparator output, which enables multiple LTC3638s to be connected in parallel for higher current applications.



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