LM3880MF-1AE

The LM3880MF-1AE from Texas Instruments is a simple power supply sequencer that provides an easy method for controlling the power-up and power-down sequence of multiple independent voltage rails. By staggering the startup sequence, this IC helps to avoid latch conditions or large in-rush currents, thereby enhancing system reliability.

This device features three sequenced outputs and offers standard fixed time delay options including 2, 10, 16, 30, 60, and 120 ms. It operates with a low quiescent current of 25 µA and supports an input voltage range of 2.7 V to 5.5 V. The LM3880MF-1AE is available in a compact 6-pin SOT-23 package, measuring 2.9 mm x 2.8 mm, making it suitable for space-constrained applications.

Designed for ease of use, the LM3880MF-1AE includes a precision enable pin and three open-drain output flags. These flags can be pulled up to different voltage supplies, allowing interface with ICs requiring various enable signal ranges. The output flags sequentially release after individual time delays during power-up and follow a reverse sequence during power-down to prevent latch-up conditions. It is also possible to cascade up to three devices to sequence as many as nine voltage rails.