76V, 1A step-down converter has 12 µA Iq, suits automotive applications
The device uses a programmable peak current-mode design to optimise efficiency over a broad range of output currents. It delivers efficiencies as high as 90% and requires only 12 µA of quiescent current. A user-programmable output current limit can set output current from 100 mA to 1A. The LTC3637 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 VIN to 0.8V. Its thermally enhanced MSOP or 3 x 5mm 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 compact solution footprint for a wide array of applications.
The LTC3637 has an internal 350-mΩ power MOSFET that draws only 12 µA at no load while maintaining output voltage regulation, suiting it tor 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 and internal or external soft-start.
In various package options and temperature ranges, pricing ranges from $3.20 to $3.77 (1000), with a hi-rel version at $9.50 (1000).
Linear Technology; www.linear.com/product/LTC3637
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