Analog Devices Inc./Maxim Integrated MAX1792EUA18+

Overview

MAX1792EUA18+ from Maxim Integrated is a 500mA low-dropout linear regulator with preset 1.8V output, operating from +2.5V to +5.5V input, featuring 130mV dropout at full load, ±1% output voltage accuracy over temperature, and integrated active-low open-drain reset with 4ms timeout - used in portable power rails for microcontrollers and RF modules in battery-powered handheld devices.

For engineers reviewing the MAX1792EUA18+ datasheet, MAX1792EUA18+ pinout, MAX1792EUA18+ application, or MAX1792EUA18+ equivalent, key selection criteria include guaranteed 500mA output under 130mV dropout, 80µA ground current independent of load, 0.1µA shutdown current, thermal shutdown at +170°C, and compatibility with 3.3µF low-ESR ceramic output capacitors.

Technical Context

The MAX1792EUA18+ employs 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 1.8V output (SET tied to GND) or adjustable mode (via external resistor divider), with V_SET threshold at 1.25V ±1.5%.

It integrates fault protection including short-circuit current limiting (0.55–1.8A), thermal shutdown with 20°C hysteresis, and undervoltage lockout (2.0–2.3V). The RST output asserts low when V_OUT falls below 93% of nominal and releases after 4ms delay upon recovery.

Key Specifications

Pinout & Package

MAX1792EUA18+ uses the 8-pin Power-µMAX package (U8E+2 outline) with exposed thermal pad (EP) on underside, requiring soldering to PCB ground plane for thermal performance and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76318DBVR and MCP1826-1802E/DB, the MAX1792EUA18+ uniquely combines 500mA capability, 130mV dropout, integrated RST with programmable delay, and thermal hysteresis in a thermally optimized µMAX package - making it optimal for high-reliability, space-constrained portable designs demanding full-feature integration.

Availability

MAX1792EUA18+ is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, personal digital assistants (PDAs), and USB peripheral power management requiring stable component supply across industrial temperature ranges.

Supply support for MAX1792EUA18+ 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX1792 belongs to Maxim's precision low-dropout regulator product line, designed specifically for battery-powered portable equipment requiring high accuracy, ultra-low quiescent current, and integrated system-monitoring features like reset outputs.

FAQ

What is the maximum output current capability of the MAX1792EUA18+ under typical operating conditions?

The MAX1792EUA18+ delivers a guaranteed 500mA output current when input voltage exceeds output by at least 500mV and ambient temperature is within -40°C to +85°C. At higher temperature or lower input-output differential, current capability decreases per the power operating region curve in the datasheet; for example, at VIN = 3.3V and TA = +85°C, maximum sustainable current is ~420mA due to thermal limits.

Does the MAX1792EUA18+ require external components to operate in its preset 1.8V mode?

No, the MAX1792EUA18+ operates in preset 1.8V mode with only two external components: a 1µF input capacitor (CIN) between IN and GND, and a 3.3µF low-ESR output capacitor (COUT) between OUT and GND. The SET pin must be connected directly to GND to select factory-trimmed output; no resistors or feedback network is needed.

How does the RST output of the MAX1792EUA18+ behave during shutdown?

When SHDN is pulled low, the MAX1792EUA18+ enters shutdown mode and forces the RST output low regardless of VOUT level - this differs from normal operation where RST responds to output regulation status. This behavior ensures a known reset state during system power-down sequences, preventing unintended microcontroller wake-up or latch-up.

Can the MAX1792EUA18+ be used with ceramic output capacitors, and what ESR range is supported?

Yes, the MAX1792EUA18+ is fully compatible with ceramic output capacitors. It is stable with COUT ≥3.3µF and ESR ≤0.1Ω - a range easily met by standard X5R/X7R MLCCs. Using higher-value ceramics (e.g., 10µF) further improves PSRR and load-transient response without compromising stability.

What thermal considerations apply to the exposed pad (EP) of the MAX1792EUA18+?

The exposed pad (EP) of the MAX1792EUA18+ is not electrically connected but serves as the primary thermal conduction path. To achieve rated 1.3W power dissipation and sustain 500mA at +85°C ambient, EP must be soldered to a minimum 100mm² copper area connected to the PCB ground plane via ≥4 thermal vias (0.3mm diameter). Inadequate EP connection reduces thermal performance and may trigger premature thermal shutdown.