76 V, 1 A Buck Converter Exhibits 12µA Quiescent Current
Linear Technology announces the LTC3637, a 76 V input-capable high efficiency buck converter that delivers up to 1 A of continuous output current. It operates from an input voltage range of 4 V to 76 V, making it ideal for telecom, industrial, avionic and automotive applications. The LTC3637 utilizes a programmable peak current-mode design to optimize efficiency over a broad range of output currents. It delivers efficiencies as high as 90% and requires only 12 µA of quiescent current, maximizing battery run time. A user-programmable output current limit can set output current from 100 mA to 1 A as required by the application. The LTC3637 can be programmed with fixed output voltages of 1.8 V, 3.3 V or 5 V or a resistor divider can be used to program outputs from VIN to 0.8 V. The LTC3637’s thermally enhanced MSOP or 3 mm x 5 mm DFN packages offer additional pin spacing required for high voltage inputs. The combination of its MSOP or DFN package and only four tiny externals provide a highly compact solution footprint for a wide array of applications.
The LTC3637 utilizes an internal 350mO power MOSFET that draws only 12 µA at no load while maintaining output voltage regulation, making it ideal for always-on battery-powered applications. Due to the inherent stability of the converter, no external compensation is required, thereby simplifying design and minimizing the solution footprint. Additional features include a precise 0.8 V ±1% feedback voltage reference and internal or external soft-start.
Pricing for the 16-Lead TSSOP version, the LTC3637EMSE and the DFN version, the LTC3637EDHC, starts at $3.20 each. Industrial temperature versions, the LTC3637IMSE and LTC3637IDHC, are tested and guaranteed to operate from a -40 °C to 125 °C operating junction temperature, priced starting at $3.52 each. Automotive temperature versions, the LTC3637HMSE and LTC3637HDHC, are tested and guaranteed to operate from a -40 °C to 150 °C operating junction temperature, priced starting at $3.77 each. Finally high reliability versions, the LTC3637MPMSE and LTC3637MPDHC, are tested and guaranteed to operate from a -55 °C to 150 °C operating junction temperature, priced starting at $9.50 each. All pricing is in 1,000-piece quantities and all versions are available from stock.