Four-rail power sequencer for controlled start-up
The LTC2928CUHF#PBF is a four-channel power supply sequencer from Analog Devices that manages the turn-on and turn-off order of up to four independent voltage rails. It monitors each rail against an adjustable threshold and asserts an active-low reset signal when any rail falls outside the programmed window. The 5 ms minimum reset timeout gives downstream logic a clean power-good window before the system starts. This part is built for controlled start-up sequencing in multi-rail systems — think server motherboards, base stations, or industrial controllers where the FPGA core must come up before the I/O banks.
Four monitored voltages means this single 38-QFN replaces what used to take a handful of reset ICs and a CPLD. The adjustable threshold per channel lets you set each rail's trip point independently — no fixed-voltage variants to stock. The active-low reset output matches the majority of FPGA and processor reset inputs, so no external inverter is needed.
Housed in a 38-lead WFQFN with an exposed pad (5x7 mm body). The tube shipping medium is fine for prototype builds; for production, order the tape-and-reel variant if your pick-and-place needs it.
If you are looking for a second-source option, the ADM1186-2ARQZ is a functional peer — same sequencer type, same 4-channel count, but its reset is active high and its operating temperature range extends to -40°C to 85°C. That wider temperature grade makes the ADM1186 a better fit for outdoor or industrial builds, but the polarity difference means a board spin if you swap directly.