Milpitas, Calif. -- Linear Technology offers the LTC3638, a 140-V 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, which makes it suitable for telecom, industrial, avionic and automotive applications. The devices are available in industrial, automotive, and military temperature versions.
The LTC3638 uses internal synchronous rectification and a programmable hysteretic-mode design to optimize efficiency over a broad range of output currents, said Linear Tech. It also 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 20 mA to 250 mA as required by the application, according to the company. In addition, it 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 thermally enhanced skipped-lead MSOP package offers the additional pin spacing required for high voltage inputs.
The buck converter uses internal high side and synchronous power switches which draw only 12µA at no load while maintaining output voltage regulation, making it suitable for always on battery-powered applications, said Linear Tech. Due to the inherent stability of the converter, no external compensation is required, which simplifies the design and minimizes the solution footprint.
Availability: All versions are available from stock.
Pricing: Starts at $3.65 each for the LTC3638EMSE. An industrial temperature version, the LTC3638IMSE, is guaranteed over a -40°C to 125°C operating junction temperature and is priced starting at $4.02 each. An automotive temperature version, the LTC3638HMSE, is guaranteed from -40°C to 150°C operating junction temperature and is priced starting at $4.27 each. A high reliability military plastic version, the LTC3638MPMSE, is tested and guaranteed over a -55°C to 150°C operating junction temperature and is priced starting at $10.84 each. All pricing is in quantities of 1,000.