1A LDO with 0.45V dropout — rail fit and thermal budget
The MAX1793EUE25 from Analog Devices is a 1A positive-output LDO regulator in a 16-TSSOP exposed-pad package. It delivers 1A continuous with a maximum dropout voltage of 0.45V at full load — meaning the input rail must stay at least 0.45V above the output voltage to maintain regulation. Output is adjustable from 1.25V up to 5V, with a fixed 2.5V option on the same die — the pin-strap selects the internal divider. The 200 µA quiescent current is moderate; it suits always-powered rails in industrial controls or test equipment where battery life is not the primary constraint. Without it, the thermal resistance rises and the part may current-limit or thermal-cycle prematurely.
Protection suite and control interface
On-chip protection covers overcurrent, overtemperature, and short-circuit — the output folds back under fault and recovers automatically when the condition clears. The Enable and Reset control pins allow external sequencing: pulling EN low shuts down the output (quiescent current drops to near zero), while the open-drain RESET output asserts low when the output falls out of regulation — useful for driving a microcontroller reset line or a power-good indicator. The 1.25V minimum output lets it power 1.2V-core logic from a 1.8V intermediate rail, provided the dropout headroom is respected.
Sourcing and lifecycle — active, no second-source on record
No official pin-compatible second-source or cross-reference is recorded for this order code. The MAX1793EUE25 is a single-source Analog Devices part; BOM hedging would require a board-level alternate with a different pinout or package. Sourced to order against RFQ through independent distribution. The package is Bulk (not tape-and-reel), which is typical for small-quantity or prototype procurement — verify the reel quantity if your pick-and-place requires tape.