Analog Devices Inc./Maxim Integrated MAX1793EUE33+T

Overview

MAX1793EUE33+T from Maxim Integrated is a low-dropout linear regulator (LDO) with pMOS pass transistor, delivering guaranteed 1A output current at 3.3V preset output, 210mV dropout at full load, ±1% output voltage accuracy over temperature and load, and 125µA ground current - designed for power rail regulation in space-constrained portable systems such as notebook computers and handheld instruments.

For engineers reviewing the MAX1793EUE33+T datasheet, MAX1793EUE33+T pinout, MAX1793EUE33+T application, or MAX1793EUE33+T equivalent, key selection criteria include dropout performance under 1A load, reset timing behavior (4ms delay), thermal shutdown threshold (+170°C), adjustable/fixed dual-mode operation via SET pin, and compatibility with low-ESR ceramic output capacitors (6.8µF).

Technical Context

The MAX1793EUE33+T implements Dual Mode™ architecture: when SET is grounded, it regulates to factory-trimmed 3.3V; when SET is biased via external resistor divider, output becomes adjustable from 1.25V to 5.0V. Its internal +1.25V reference feeds an error amplifier driving a p-channel MOSFET pass device - eliminating base-drive current and enabling ultra-low quiescent current (125µA typical at light load).

Regulation stability relies on externally bypassed IN (4.7µF) and OUT (6.8µF, ESR ≤ 0.5Ω) pins; RST provides open-drain reset assertion when VOUT drops below 94% of nominal (3.102V), holding low for ≥4ms after recovery. Thermal protection disables the pass transistor above +170°C with ~20°C hysteresis.

Key Specifications

Pinout & Package

MAX1793EUE33+T is housed in a 16-pin thermally enhanced TSSOP package (U16E-3 outline) with exposed pad (EP) for heatsinking. The package measures 5mm × 4.4mm × 1.1mm and delivers 1.5W continuous power dissipation at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79333DBVR and MCP1826-3302E/DC, MAX1793EUE33+T uniquely combines 1A capability, 210mV dropout, ±1% accuracy, integrated 4ms-reset, and thermally optimized TSSOP-EP packaging - making it optimal for compact, high-current portable systems needing guaranteed regulation margin and robust power sequencing.

Availability

MAX1793EUE33+T is available at Aetrix Electronics and suitable for notebook computers, cordless telephones, and handheld instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX1793EUE33+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 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 product line - engineered specifically for battery-powered portable equipment demanding minimal dropout, precise voltage regulation, and integrated system-level features like reset and thermal protection.

FAQ

What output voltage does MAX1793EUE33+T deliver?

MAX1793EUE33+T delivers a factory-trimmed, preset 3.3V output with ±1% accuracy across -40°C to +85°C and 1mA–1A load range. It can also operate in adjustable mode (1.25V–5.0V) when the SET pin is configured with an external resistor divider - but the "33" suffix confirms this specific variant is calibrated and tested for 3.3V operation.

Does MAX1793EUE33+T require external capacitors?

Yes, MAX1793EUE33+T requires two external capacitors: a 4.7µF capacitor between IN and GND to reduce input impedance, and a 6.8µF low-ESR (≤0.5Ω) capacitor between OUT and GND to ensure stability and transient response. Ceramic capacitors are recommended for both positions due to their low ESR and compact size.

How does the RST pin function on MAX1793EUE33+T?

The RST pin on MAX1793EUE33+T is an open-drain output that goes low when VOUT falls below 94% of nominal (3.102V) and remains low for at least 4ms after VOUT recovers. It requires a 100kΩ pull-up resistor to OUT or another logic supply. This provides a reliable power-on-reset signal for microcontrollers without needing a separate supervisor IC.

What thermal considerations apply to MAX1793EUE33+T?

MAX1793EUE33+T features thermal shutdown at +170°C junction temperature with ~20°C hysteresis. To maintain reliability, the exposed pad (EP) and GND pin must be soldered to a large PCB ground plane (≥1 in² recommended). At +70°C ambient, its 1.5W power dissipation rating allows continuous 1A operation with sufficient input-output differential voltage.

Is MAX1793EUE33+T RoHS-compliant?

Yes, MAX1793EUE33+T is RoHS-compliant and lead(Pb)-free. The "+T" suffix explicitly denotes the lead-free, RoHS-compliant version in the TSSOP-EP package. It meets JEDEC J-STD-020 reflow standards with a peak soldering temperature of +260°C.