100-mA buck converter features 150-V input

The LTC3639 synchronous buck converter features a 150-V input and delivers up to 100-mA continuous output current. It operates from an input voltage range of 4.5 to 150 V and eliminates the need for an external transient suspension device.

The LTC3639 delivers efficiencies as high as 92% and requires only 12-µA quiescent current, maximizing battery run time and eliminating thermal issues. A user-programmable output current limit can set output current from 10 to 100-mA. It can be programmed with fixed output voltages of 1.8, 3.3 or 5 V, or a resistor divider can be used to program outputs from 0.8 to VIN. The thermally enhanced MSOP package offers the additional pin spacing required for high voltage inputs. It also features a precise 0.8-V +1% feedback voltage reference, internal or external soft-start, and a feedback comparator output.