Analog Devices Inc./Maxim Integrated MAX1792EUA25

Overview

The MAX1792EUA25 from Maxim Integrated is a 2.5V fixed-output, 500mA low-dropout linear regulator featuring an internal PMOS pass transistor, ±1% output voltage accuracy over temperature and load, 130mV dropout at full load, and integrated active-low open-drain reset with 4ms timeout - designed for power-sensitive portable systems including notebook computers and cellular handsets.

For engineers reviewing the MAX1792EUA25 datasheet, MAX1792EUA25 pinout, MAX1792EUA25 application, or MAX1792EUA25 equivalent, key selection criteria include guaranteed 500mA output under 130mV dropout, 80µA ground current independent of load, 0.1µA shutdown current, thermal and short-circuit protection, and compatibility with low-ESR ceramic output capacitors (3.3µF).

Technical Context

The MAX1792EUA25 employs a P-channel MOSFET pass element with 0.25Ω R_DS(ON), enabling low dropout and eliminating base-drive current losses typical of PNP-based regulators. Its Dual Mode™ architecture selects between factory-trimmed 2.5V output (SET tied to GND) or adjustable mode (via external resistor divider), with V_SET threshold at 1.25V ±12mV.

Regulation relies on a precision 1.25V bandgap reference and error amplifier comparing feedback against that reference. The reset function monitors V_OUT against 93% of nominal output, asserting RST low until V_OUT stabilizes and holds high-impedance for ≥4ms post-regulation.

Key Specifications

Pinout & Package

The MAX1792EUA25 is housed in an 8-pin Power-µMAX package (U8E+2) with an exposed thermal pad (EP) on the underside, requiring soldering to PCB ground plane for optimal thermal performance. Package outline conforms to Maxim land pattern 90-0145.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1792EUA25, both alternatives offer smaller footprints but sacrifice 500mA capability, integrated reset, and sub-200mV dropout - making them viable only in lower-power, non-sequencing roles where thermal performance and load headroom are less critical.

Availability

MAX1792EUA25 is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and personal digital assistants requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.

Supply support for MAX1792EUA25 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 series was developed specifically for battery-powered portable electronics demanding ultra-low quiescent current, tight output accuracy, and robust fault protection in miniature packages - targeting PDA, handset, and ultraportable computing markets.

FAQ

What is the guaranteed dropout voltage of the MAX1792EUA25 at 500mA load?

The MAX1792EUA25 guarantees a maximum dropout voltage of 360mV at 500mA load and V_OUT = 2.5V over the full operating temperature range (-40°C to +85°C). Typical dropout is 210mV under the same conditions. This specification ensures reliable regulation even as input voltage drops near battery end-of-life, such as from a single-cell Li-ion source discharging to 2.85V.

Can the MAX1792EUA25 be used in adjustable-output configuration?

Yes, the MAX1792EUA25 supports adjustable output from 1.25V to 5.0V by connecting the SET pin to a resistive divider between OUT and GND. Although its suffix "25" denotes factory-trimmed 2.5V operation, the underlying Dual Mode™ architecture permits reconfiguration. The SET pin threshold is 1.25V ±12mV, and R2 should be selected between 25kΩ and 100kΩ for optimal accuracy and noise immunity.

How does the RST pin function on the MAX1792EUA25, and what external components are needed?

The RST pin on the MAX1792EUA25 is an open-drain, active-low output that asserts low when V_OUT falls below 93% of 2.5V (i.e., 2.325V) and releases high-impedance 4ms after V_OUT rises above that threshold. To generate a logic-high signal, a pullup resistor (typically 100kΩ) must connect RST to OUT. No additional timing components are required - the 4ms delay is internally generated and temperature-stable.

What thermal design considerations apply to the MAX1792EUA25 in its Power-µMAX package?

The MAX1792EUA25's Power-µMAX package features an exposed thermal pad (EP) and GND pin that jointly serve as thermal conduction paths. For reliable 500mA operation at +70°C ambient, both EP and pin 5 (GND) must be soldered to a minimum 200mm² copper area connected to the PCB ground plane via ≥4 thermal vias. Without this, power dissipation is limited to <0.8W instead of the rated 1.3W, risking thermal shutdown under sustained load.

Is the MAX1792EUA25 compatible with ceramic output capacitors, and what ESR requirements apply?

Yes, the MAX1792EUA25 is fully compatible with ceramic output capacitors. It requires a 3.3µF low-ESR capacitor (≤0.1Ω) placed directly at the OUT pins for stability across temperature and load. For 2.5V output, X5R or X7R dielectrics in 0805 or 1206 case sizes meet this requirement. Using higher capacitance (e.g., 10µF) further improves transient response and PSRR without compromising stability.