Analog Devices Inc./Maxim Integrated MAX1792EUA25/V+

Overview

MAX1792EUA25/V+ from Maxim Integrated is a 500mA, low-dropout linear regulator with preset 2.5V output, operating from +2.5V to +5.5V input, featuring ±1% output voltage accuracy over temperature and load, 130mV dropout at 500mA, and integrated active-low open-drain reset with 4ms timeout - used in automotive-grade power rails for microcontrollers in USB hubs and docking stations.

For engineers reviewing the MAX1792EUA25/V+ datasheet, MAX1792EUA25/V+ pinout, MAX1792EUA25/V+ application, or MAX1792EUA25/V+ equivalent, key selection criteria include guaranteed 500mA output under automotive temperature range (−40°C to +85°C), 0.1µA shutdown current, thermal shutdown at 170°C, and Power-µMAX package compatibility with exposed thermal pad for enhanced thermal performance.

Technical Context

The MAX1792EUA25/V+ uses an internal PMOS pass transistor with 0.25Ω R_DS(ON), enabling low ground current (80µA typical) independent of load and eliminating base-drive losses common in PNP-based regulators. Its Dual Mode™ architecture selects between factory-trimmed 2.5V output (SET tied to GND) and adjustable mode via external resistor divider.

Reset functionality is implemented as an open-drain N-channel output referenced to 93% of nominal V_OUT, with 4ms release delay after regulation recovery; shutdown control is active-low with 0.6V logic threshold and 100nA bias current, supporting direct connection to IN for normal operation.

Key Specifications

Pinout & Package

The MAX1792EUA25/V+ is housed in an 8-pin Power-µMAX package (U8E+2 outline) with exposed thermal pad (EP) on underside, requiring soldering to PCB ground plane for optimal thermal performance (θ_JA reduced by >30% vs. standard µMAX).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4701RGWR and MCP1826T-2502E/OT, the MAX1792EUA25/V+ uniquely combines automotive temperature rating, integrated reset with programmable delay, thermal shutdown, and 130mV dropout in a thermally enhanced Power-µMAX package - making it the sole option for space-constrained, safety-critical 2.5V rail generation in vehicle electronics.

Availability

MAX1792EUA25/V+ is available at Aetrix Electronics and suitable for automotive telematics modules, USB hub power management, docking station core rails, and cellular baseband power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1792EUA25/V+ 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 demanding industrial, automotive, and communications applications.

The MAX1792 series was developed specifically for battery-powered and automotive systems requiring high-accuracy, low-quiescent-current LDOs with integrated power-good signaling and robust thermal protection in miniature packages.

FAQ

What is the guaranteed output voltage accuracy of the MAX1792EUA25/V+ over temperature and load?

The MAX1792EUA25/V+ guarantees ±1% output voltage accuracy at I_OUT = 100mA and T_A = 0°C to +85°C. Over the full automotive range (−40°C to +85°C) and 1mA–500mA load, accuracy degrades to ±3%. This ensures reliable 2.5V rail delivery for 2.5V logic families without external trimming. The MAX1792EUA25/V+ achieves this via factory laser-trimming of internal feedback resistors.

Does the MAX1792EUA25/V+ require external capacitors, and what values are recommended?

Yes, the MAX1792EUA25/V+ requires a 1µF ceramic capacitor between IN and GND, and a 3.3µF low-ESR (≤0.1Ω) ceramic capacitor between OUT and GND for stable operation up to 500mA. For 2.5V output, a 4.7µF output capacitor is optional but improves transient response. These values are validated per Maxim's application notes and ensure stability across −40°C to +85°C. The MAX1792EUA25/V+ will oscillate or exhibit poor PSRR without them.

How does the reset output (RST) of the MAX1792EUA25/V+ function, and what external components are needed?

The RST pin is an open-drain N-channel output that pulls low when V_OUT falls below 93% of 2.5V (i.e., 2.325V) and remains low for ≥4ms after V_OUT recovers. To generate a logic-high signal, a 100kΩ pullup resistor from RST to OUT is required. When unused, RST may be left floating or grounded. During shutdown, RST is forcibly held low regardless of V_OUT. This behavior is fully specified in the MAX1792EUA25/V+ datasheet.

What thermal design considerations apply to the MAX1792EUA25/V+ in automotive applications?

The MAX1792EUA25/V+ features an exposed thermal pad (EP) that must be soldered to a PCB ground plane using ≥6 thermal vias to maintain junction temperature ≤150°C. At 500mA and 1V dropout, power dissipation is 500mW; with proper thermal layout, the device sustains full load at +85°C ambient. Derating begins above +70°C ambient (17mW/°C). The MAX1792EUA25/V+ thermal shutdown activates at +170°C with 20°C hysteresis, protecting against sustained overload.

Is the MAX1792EUA25/V+ pin-compatible with other variants in the MAX1792 family, such as MAX1792EUA33/V+?

Yes, all MAX1792 variants including MAX1792EUA25/V+ and MAX1792EUA33/V+ share identical Power-µMAX-8 (U8E+2) packaging, pinout, and footprint. Only the factory-trimmed output voltage differs (2.5V vs. 3.3V); all electrical characteristics - dropout, ground current, reset behavior, and thermal limits - are identical. This enables drop-in voltage scaling during design iteration without PCB changes. The MAX1792EUA25/V+ top-mark "AAAB" confirms its 2.5V variant identity.