Active production — 150 mA fixed-output LDO for small-signal rails
The LP3987ITL-2.6/NOPB: Quiescent current is 120 µA typical, with a maximum supply current of 200 µA across the operating range. For a battery-powered sensor node that spends most of its time in a low-power state, that 120 µA is the regulator's own draw — it sets the floor for the system's sleep current.
PSRR profile and noise rejection at 10 kHz
Power supply rejection ratio (PSRR) is specified at 50 dB to 10 dB at 10 kHz. The drop to 10 dB at 10 kHz is the crossover where the control loop runs out of gain; above that frequency, upstream switching noise from a buck converter passes through largely unattenuated. If the LP3987ITL-2.6/NOPB is powering a low-noise analog front-end (ADC reference, op-amp supply), the 10 kHz PSRR floor means the input rail needs to be clean above that frequency — a ferrite bead or a second LC filter ahead of the regulator helps keep switching artifacts off the output.
Package, temperature grade, and protection
Housed in a 5-bump DSBGA (5-WFBGA) package measuring 1.41 x 1.08 mm, this is a tiny footprint — the sort of package that fits under a shield can or on the back side of a densely populated board. The -40°C to 125°C operating range covers both industrial enclosures and under-hood automotive ambient. The Enable pin lets a GPIO or a supervisor IC gate the output rail.