3A adjustable LDO in a DDPAK — what it is and where it fits
The LMS1587ISX-ADJ is a single-output, adjustable positive linear regulator rated for 3A continuous output. Its maximum dropout voltage is 1.3V at 3A.
Dropout voltage at 3A — the headroom number that matters
The 1.3V maximum dropout at 3A is the spec that decides whether this regulator holds regulation under brownout or with a sagging input rail.
PSRR at 120 Hz — ripple rejection for post-rectifier rails
72dB PSRR at 120Hz means the regulator attenuates full-wave-rectified ripple.
Package and rework — DDPAK/TO-263-3
The DDPAK/TO-263-3 is a surface-mount tabbed package with three leads plus the tab.
Protection features — over-current and thermal shutdown
Built-in over-current and over-temperature protection mean the regulator survives a shorted output or a stalled fan without failing.
Lifecycle and sourcing
It is RoHS non-compliant, which may restrict use in EU RoHS-regulated markets unless an exemption applies — check your local compliance requirements.