Analog Devices Inc./Maxim Integrated MAX1792EUA50+

Overview

MAX1792EUA50+ from Maxim Integrated is a 500mA, low-dropout linear regulator with fixed 5.0V output, operating from +2.5V to +5.5V input, featuring ±1% output voltage accuracy, 130mV dropout at full load, and an active-low open-drain reset output with 4ms timeout. It is designed for space-constrained, battery-powered systems requiring stable 5V rail generation under variable load and temperature.

For engineers reviewing the MAX1792EUA50+ datasheet, MAX1792EUA50+ pinout, MAX1792EUA50+ application, or MAX1792EUA50+ equivalent, key selection considerations include guaranteed 500mA output current, ultra-low 80µA ground current in active mode, 0.1µA shutdown current, thermal overload protection, and compatibility with standard 3.3µF low-ESR ceramic output capacitors.

Technical Context

The MAX1792EUA50+ uses an internal PMOS pass transistor (R_DS(ON) ≈ 0.25Ω) enabling low dropout and load-independent quiescent current. Its Dual Mode™ architecture selects between factory-trimmed 5.0V regulation (SET tied to GND) and adjustable operation via external resistive divider - though the MAX1792EUA50+ variant is configured exclusively for preset 5.0V output per its suffix and top-mark "AAAD".

It integrates a 1.25V reference, error amplifier, thermal shutdown (170°C trip, 20°C hysteresis), short-circuit current limiting (0.55–1.8A), and a precision reset comparator monitoring V_OUT at 90–96% of nominal voltage with 1.5–8ms release delay. The RST output is open-drain N-channel, requiring external pull-up to OUT or V_IN.

Key Specifications

Pinout & Package

The MAX1792EUA50+ is housed in an 8-pin Power-µMAX package (U8E+2 outline) with an exposed thermal pad (EP) on the underside, requiring soldering to PCB ground plane for optimal thermal performance. Pin 1 and 2 are paralleled IN inputs; pins 7 and 8 are paralleled OUT outputs; EP is not internally connected but must be externally grounded.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Compared with TPS76350DBVR and MCP1703T-5002E/MB, the MAX1792EUA50+ uniquely combines 500mA capability, 130mV dropout, and integrated reset in a thermally robust µMAX package - making it the sole option among these three for high-current, low-headroom, and sequenced-power applications.

Availability

MAX1792EUA50+ is available at Aetrix Electronics and suitable for USB hubs, notebook computers, cellular telephones, docking stations, and base stations requiring stable component supply, RoHS-compliant packaging, and guaranteed -40°C to +85°C operation.

Supply support for MAX1792EUA50+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power-management ICs for industrial, communications, computing, and consumer applications.

The MAX1792 series was developed specifically for battery-powered portable electronics needing high-current, low-dropout regulation with integrated power-good signaling - targeting PDA, smartphone, and ultraportable computing power architectures.

FAQ

What is the maximum input voltage for the MAX1792EUA50+?

The MAX1792EUA50+ supports an absolute maximum input voltage of +6V on the IN pin, but its specified operating range is +2.5V to +5.5V. Operation above +5.5V risks exceeding absolute maximum ratings and is not guaranteed. For reliable 5.0V output, VIN must remain ≥5.13V to stay above dropout; inputs near +5.5V are acceptable but require attention to power dissipation.

Does the MAX1792EUA50+ require external components to operate?

Yes, the MAX1792EUA50+ requires two external capacitors: a 1µF ceramic capacitor between IN and GND, and a 3.3µF low-ESR (≤0.1Ω) ceramic capacitor between OUT and GND. A 100kΩ pull-up resistor from RST to OUT is needed if the reset signal is used. No external feedback resistors are required for the MAX1792EUA50+ since it is factory-configured for fixed 5.0V output.

Can the MAX1792EUA50+ be used in adjustable-output mode?

No - the MAX1792EUA50+ is a preset-output variant with internal feedback trimmed to 5.0V. Its SET pin is intended to be tied to GND for this mode. While the underlying MAX1792 architecture supports adjustable operation via external resistors, the MAX1792EUA50+'s factory programming and top-mark "AAAD" lock it to 5.0V; using SET for adjustment would violate datasheet specifications and result in undefined output voltage.

How does the reset output (RST) function on the MAX1792EUA50+?

The RST pin on the MAX1792EUA50+ is an open-drain N-channel output that pulls low when V_OUT falls below 90–96% of 5.0V (i.e., 4.5–4.8V). After V_OUT recovers, RST remains low for a guaranteed 1.5–8ms timeout before going high-impedance. To generate a logic-high signal, a 100kΩ pull-up resistor to OUT is required. During shutdown, RST is forcibly held low regardless of V_OUT.

Is the exposed thermal pad (EP) on the MAX1792EUA50+ electrically connected?

No, the exposed pad (EP) on the MAX1792EUA50+ is not internally connected to any die node. It serves solely as a thermal conduction path and must be soldered to the PCB ground plane to achieve the rated 1.3W power dissipation and prevent thermal shutdown. Leaving EP unconnected or floating degrades thermal performance and may cause premature thermal limiting at currents well below 500mA.