PSRR across the band — why it matters for noise-sensitive rails
The ADM7155ACPZ-03-R7 is an adjustable-output LDO from Analog Devices that delivers up to 600 mA with a PSRR of 94 dB at 1 kHz, rolling off to 57 dB at 1 MHz. That PSRR curve is the part's main event: it keeps switching-regulator ripple and high-frequency noise off sensitive analog, RF, or data-converter supply rails. The dropout voltage maxes at 0.21 V at full load, so a 3.3 V rail can regulate down to 2.9 V with only 3.6 V input — useful in systems where the input bus sags under transient load.
Package, temperature, and protection — design-in checklist
Housed in an 8-WFDFN exposed-pad CSP (8-LFCSP-WD, 3x3 mm), surface-mount only. Protection features include over-current and over-temperature shutdown; an enable pin lets the system sequence the rail on and off. Quiescent current is 7 mA typical, supply current maxes at 10 mA.