Buck converters need 2.7-µA quiescent current

Buck converters need 2.7-µA quiescent current

The LT3975 and LT3976 42-V step-down switching regulators delivers 2.5-A continuous output current and requires only 2.7–µA quiescent current. The converters can operate from a 40-V input, deliver up to 5-A output current and require only 3.3–µA of quiescent current. Both devices offer a 4.2- to a nominal 40-V input voltage range, suiting them for automotive and industrial applications.

The buck regulators have 75-mΩ switches that deliver 90% efficiency. The device maintains a minimum dropout voltage of 500 mV when the output voltage drops below the programmed output voltage. Switching frequency is user-programmable from 200 kHz to 2 MHz, and synchronizable from 250 kHz to 2 MHz. They are packaged in a thermally enhanced MSOP-16. (Ea/1,000: LT3975, $3.10; LT3976, $3.75 — available now.)

By Paul O’Shea

Linear Technology , Milpitas , CA
Sales Office 408-428-2050
www.linear.com