Analog Devices Inc./Maxim Integrated MAX1793EUE50+T

Overview

MAX1793EUE50+T from Maxim Integrated is a low-dropout linear regulator (LDO) with pMOS pass transistor, delivering guaranteed 1A output current at ±1% accuracy and 210mV dropout (at 1A), designed for battery-powered portable systems requiring stable 5.0V rail generation from 2.5V–5.5V input sources.

For engineers reviewing the MAX1793EUE50+T datasheet, MAX1793EUE50+T pinout, MAX1793EUE50+T application, or MAX1793EUE50+T equivalent, key selection criteria include its 125µA ground current in active mode, 0.1µA shutdown current, 115µVRMS output noise, integrated 4ms reset output, and TSSOP-EP package thermal performance.

Technical Context

The MAX1793EUE50+T implements Dual Mode™ operation: SET pin <50mV selects factory-preset 5.0V output via internal resistor divider; external resistor network on SET enables adjustable 1.25V–5.0V regulation. Its p-channel MOSFET pass device eliminates base-drive current, enabling ultra-low quiescent current across load and dropout conditions.

Internal circuitry includes a +1.25V reference, error amplifier, MOSFET driver with foldback current limit, thermal sensor (trip at +170°C), and low-VOUT comparator asserting RST when VOUT falls 6% below nominal. RST is open-drain with 4ms release delay and operates validly from 1.0V to 5.5V input range.

Key Specifications

Pinout & Package

MAX1793EUE50+T is housed in a 16-pin thermally enhanced TSSOP package (U16E-3 outline) with exposed pad (EP) for PCB-level heat sinking. The 1.1mm profile and 30% smaller footprint vs. SOT223 enable high-density portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS7A4701RGWR and MCP1826-5002E/DB, MAX1793EUE50+T uniquely balances 1A output, 210mV dropout, integrated reset, and 125µA quiescent current in a thermally optimized TSSOP-EP - making it optimal for space-constrained, battery-sensitive 5V systems where reliability and feature integration are prioritized.

Availability

MAX1793EUE50+T is available at Aetrix Electronics and suitable for cellular phones, notebook computers, cordless telephones, and handheld instruments requiring stable component supply with RoHS-compliant packaging and automotive-grade traceability options.

Supply support for MAX1793EUE50+T 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 MAX1793 belongs to Maxim's low-IQ, high-current LDO family engineered for portable battery-powered equipment where extended runtime, small footprint, and integrated protection are essential design requirements.

FAQ

What output voltage does the MAX1793EUE50+T deliver?

The MAX1793EUE50+T delivers a factory-preset 5.0V output with ±1% accuracy over -40°C to +85°C and 1mA–1A load range. This is selected by connecting the SET pin to GND. The device also supports adjustable operation from 1.25V to 5.0V using an external resistor divider on the SET pin.

Does the MAX1793EUE50+T include built-in protection features?

Yes, the MAX1793EUE50+T integrates short-circuit current limiting (1.1–3.3A), thermal-overload protection (shuts down at +170°C with ~20°C hysteresis), input undervoltage lockout (2.0–2.3V), and output current foldback. These features protect both the IC and downstream circuitry during fault conditions without external components.

How does the RST pin function on the MAX1793EUE50+T?

The RST pin on the MAX1793EUE50+T is an open-drain output that goes low when VOUT drops below 94% of nominal (4.7V for 5.0V output) and remains low for ≥4ms after VOUT recovers. It requires a 100kΩ pull-up resistor to OUT or another logic rail and serves as a reliable power-on-reset signal for microcontrollers or FPGA configuration circuits.

What is the recommended input and output capacitance for the MAX1793EUE50+T?

The MAX1793EUE50+T requires a 4.7µF ceramic capacitor between IN and GND, and a 6.8µF low-ESR (<0.5Ω) capacitor between OUT and GND. Ceramic capacitors are preferred for COUT to ensure stability and minimize output noise; tantalum or OS-CON types may be used if ESR ≤0.5Ω. Both capacitors must be placed as close as possible to the IC pins.

Can the MAX1793EUE50+T operate from a single-cell Li-ion battery?

Yes, the MAX1793EUE50+T operates from 2.5V to 5.5V input, making it compatible with single-cell Li-ion batteries (2.7V–4.2V). However, because its 5.0V output requires ≥5.21V input to maintain regulation at 1A (due to 210mV dropout), it is best suited for applications where the 5.0V rail is derived from a higher intermediate rail (e.g., 5.5V DC/DC output) rather than directly from a depleted Li-ion cell.