The LTC7138 consumes only 12μA at no load and is ideal for always-on battery-powered applications while maintaining output voltage regulation. Due to the converter's inherent stability, no external compensation components are required, simplifying design and minimizing solution footprint. Additionally, features such as precision 0.8V ±1% feedback voltage reference, 100% duty cycle dropout operation, internal or external soft-start, and feedback comparator output are included. Notably, through the feedback comparator output function, multiple LTC7138 products can be paralleled for higher current applications.

The LTC7138EMSE is priced at $3.80 per unit. The industrial temperature version LTC7138IMSE is priced at $4.18 per unit. Furthermore, the automotive temperature version LTC7138HMSE is designed to operate in an operating junction temperature range of –40°C to 150°C and is priced at $4.43 per unit. The LTC7138MPMSE is a high-reliability version guaranteeing operation over an operating junction temperature range of –55°C to 150°C. This product costs $11.29 per unit. All products are based on a quantity of 1,000 units and are available immediately. For more information, refer to www.linear.com/product/LTC7138.

Photo caption: 140V, 400mA buck converter with adjustable output current limiting

Product Features: LTC7138

• Wide operating input range: 4V to 140V

• Internally low-resistance power MOSFET

• Inherent stability: no compensation required

• Adjustable maximum output current from 100mA to 400mA

• Low dropout operation: 100% duty cycle

• Low quiescent current: 12μA

• Wide output range: 0.8V to VIN

• 0.8V ±1% feedback voltage reference

• Precision RUN pin threshold

• Internal or external soft-start function

• Output programmable or adjustable at 1.8V, 3.3V, 5V

• Requires only minimal external components

• Programmable input overvoltage lockout

• Thermally enhanced high-voltage MSOP package