Low-IQ PMIC for handheld gear — what the 225 µA means
The MAX1586AETM is a low-quiescent-current power-management IC from Maxim, built for handheld and mobile devices where every microamp on the battery rail matters. Its 225 µA supply current is the number a portable-system designer checks first: it tells you the PMIC itself won't eat the standby budget. The 2.6 V to 5.5 V input range covers a single-cell Li-ion through USB 5 V, so it fits right into a phone, tablet, or portable instrument without a separate pre-regulator.
No AEC-Q100 sticker here, so it's not aimed at under-hood automotive, but the industrial temp range covers most mobile equipment that lives outside a climate-controlled office.
Package and layout — the 48-TQFN exposed pad
Without it, the part derates hard above 400 mA continuous, though the datasheet thermal curves tell the full story. Surface-mount only; no socket option, so plan for reflow or hot-air rework if you need to swap it in the field.
The part is RoHS non-compliant, so if your BOM requires lead-free assembly, you'll need to qualify the MAX1586AETM+ (the lead-free variant) or work the exemption.