140V, 400mA Step-Down Converter with quiescent current of only 12μA

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Photocoupler

Linear Technology Corporation (Linear Technology Corporation) Release 140V input, high efficiency buck converter LTC7138, the device provides continuous output current up to 400mA. Operating over an input voltage range of 4V to 140V, the LTC7138 is ideal for a wide range of applications in telecommunications, industrial, avionics and automotive. The LTC7138 is designed with programmable hysteresis mode to optimize efficiency over a wide output current range. The device uses an internal 1.8Ω power MOSFET for reliable and high efficiency operation. The user-programmable output current limit sets the output current from 100mA to 400mA, depending on the application. The LTC7138 can be set to a fixed output voltage of 1.8V, 3.3V or 5V, or a resistor divider can be used to set the output from 0.8V to VIN. The LTC7138's thermally enhanced MSOP package provides the extra pin spacing required for high voltage inputs. The combination of its MSOP and only four tiny external components creates a very compact footprint for a wide range of applications.

The LTC7138 draws only 12μA at no load while keeping the output voltage stable, making it ideal for battery-powered applications that are always on. Thanks to the inherent stability of the converter, no external compensation is required, which simplifies the design and minimizes the solution footprint. In addition, the device's features include a precision 0.8V ±1% feedback voltage reference, 100% duty cycle differential operation, internal or external soft-start, and a feedback comparator output, which allows multiple LTC7138s to be connected in parallel for current Bigger application.