Analog Devices Inc./Maxim Integrated MAX1792EUA33/V+

Overview

MAX1792EUA33/V+ from Maxim Integrated is a 500mA, 3.3V fixed-output low-dropout linear regulator with PMOS pass transistor, ±1% output accuracy over –40°C to +85°C, 130mV dropout at full load, and integrated active-low open-drain reset with 4ms timeout. It serves as a primary voltage rail for core logic in portable battery-powered systems including notebook computers and USB hubs.

For engineers reviewing the MAX1792EUA33/V+ datasheet, MAX1792EUA33/V+ pinout, MAX1792EUA33/V+ application, or MAX1792EUA33/V+ equivalent, key selection criteria include guaranteed 500mA output under 130mV dropout, automotive-grade qualification (–40°C to +85°C), thermal shutdown at 170°C, 0.1µA shutdown current, and compatibility with 3.3µF low-ESR ceramic output capacitors.

Technical Context

The MAX1792EUA33/V+ employs an internal 1.25V reference and error amplifier driving a 0.25Ω P-channel MOSFET pass transistor, enabling load-independent 80µA ground current and stable regulation down to 100mV input-output differential. Its Dual Mode™ architecture selects between factory-trimmed 3.3V output (SET tied to GND) and adjustable mode via external resistor divider (SET biased at 1.25V).

Reset functionality is implemented with a comparator monitoring VOUT against 93% of nominal output, asserting active-low RST for ≥4ms after regulation recovery. Thermal protection uses a junction sensor triggering shutdown at 170°C with 20°C hysteresis, while short-circuit current limit scales from 0.8A (normal) to 1.6A (in-regulation), supporting indefinite fault tolerance.

Key Specifications

Pinout & Package

The MAX1792EUA33/V+ is housed in an 8-pin Power-µMAX package (U8E+2 outline) with exposed thermal pad (EP) on the underside, requiring soldering to PCB ground plane for optimal thermal performance (θJA ≤ 60°C/W with 2-in² copper).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79533DRBR and MCP1825-3302E/DB, the MAX1792EUA33/V+ uniquely combines automotive temperature range, integrated 4ms reset, sub-150mV dropout, and short-circuit foldback - making it optimal for safety-critical portable electronics where reliability and power sequencing integrity are mandatory.

Availability

MAX1792EUA33/V+ is available at Aetrix Electronics and suitable for notebook computers, USB hubs, cellular telephones, docking stations, and automotive infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1792EUA33/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 belongs to Maxim's ultra-low-quiescent-current LDO family, engineered specifically for battery-powered portable equipment requiring high accuracy, low dropout, and integrated power-good signaling in miniature packages.

FAQ

What is the guaranteed dropout voltage of the MAX1792EUA33/V+ at 500mA load?

The MAX1792EUA33/V+ guarantees a maximum dropout voltage of 130mV at 500mA load and +25°C, with typical values of 120mV. This specification holds across the full –40°C to +85°C operating range, enabling reliable operation down to VIN = 3.43V while maintaining 3.3V output regulation. The low dropout is achieved using an internal 0.25Ω P-channel MOSFET pass transistor.

Does the MAX1792EUA33/V+ require external components for basic operation?

Yes, the MAX1792EUA33/V+ requires two external capacitors for stable operation: a minimum 1µF ceramic capacitor between IN and GND, and a minimum 3.3µF low-ESR (≤0.1Ω) ceramic capacitor between OUT and GND. For the RST output, a 100kΩ pull-up resistor from RST to OUT is required to generate a valid logic-high reset signal. No external feedback resistors are needed for the fixed 3.3V output mode.

How does the /V+ suffix affect the MAX1792EUA33/V+ specifications?

The /V+ suffix denotes automotive qualification for the MAX1792EUA33/V+, confirming operation across –40°C to +85°C ambient temperature with enhanced process controls and screening aligned to AEC-Q200 stress test requirements. Electrical specifications remain identical to the commercial-grade MAX1792EUA33+, but the /V+ variant undergoes additional reliability validation for use in automotive infotainment and telematics modules.

Can the MAX1792EUA33/V+ be used in adjustable-output configurations?

Yes, the MAX1792EUA33/V+ supports adjustable output voltages from 1.25V to 5.0V by connecting the SET pin to a resistive divider between OUT and GND instead of grounding it. In this mode, the internal 1.25V reference is used as the feedback threshold, and output voltage is calculated as VOUT = 1.25V × (1 + R1/R2). The /V+ suffix does not restrict this capability - all electrical parameters remain valid in adjustable mode.

What thermal management practices are required for the MAX1792EUA33/V+?

The MAX1792EUA33/V+ features an exposed thermal pad (EP) that must be soldered to a PCB ground plane using ≥6 thermal vias to inner layers to achieve its rated 1.3W power dissipation. The GND pin also serves as a thermal conduction path. Without proper thermal design, junction temperature may exceed 150°C under 500mA load with >1V input-output differential, triggering thermal shutdown at 170°C. Layout guidelines specify minimum 2-in² copper area beneath the package.