Analog Devices Inc./Maxim Integrated MAX1793EUE20+

Overview

MAX1793EUE20+ from Maxim Integrated is a low-dropout linear regulator (LDO) with pMOS pass transistor, delivering 1A output current at 2.0V preset voltage with ±1% accuracy and 270mV guaranteed dropout at full load. It operates from +2.5V to +5.5V input and integrates reset output, shutdown control, thermal overload and short-circuit protection - used in portable battery-powered systems requiring stable low-noise power.

For engineers reviewing the MAX1793EUE20+ datasheet, MAX1793EUE20+ pinout, MAX1793EUE20+ application, or MAX1793EUE20+ equivalent, key selection criteria include guaranteed 1A output under 270mV dropout, 125µA ground current at light load, 115µVRMS output noise, 4ms reset delay, and TSSOP-EP package thermal performance for handheld instruments and cellular phones.

Technical Context

The MAX1793EUE20+ implements Dual Mode™ operation: SET pin <50mV selects factory-trimmed 2.0V output; external resistor divider enables adjustable 1.25V–5.0V regulation. 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) across load range.

Thermal protection activates at +170°C junction temperature with ~20°C hysteresis; RST is open-drain, asserting low when VOUT falls 6% below nominal and holding for ≥4ms after recovery. Shutdown reduces supply current to 0.1µA while pulling OUT low via 5kΩ internal resistance.

Key Specifications

Pinout & Package

MAX1793EUE20+ uses a 16-pin thermally enhanced TSSOP-EP package (1.5W, 3.1mm × 5.1mm × 1.1mm) with exposed pad (EP) soldered to PCB ground plane for optimal heat dissipation. Pin 10 (GND) and EP jointly serve as thermal and electrical ground paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1793EUE20+, TPS79620DRBR offers lower dropout but lacks integrated reset and thermal protection, while MCP1826-2.0/DC provides similar IQ but requires higher input voltage margin and offers no system monitoring features - making MAX1793EUE20+ optimal for battery-powered devices needing robust fault coverage and compact thermal design.

Availability

MAX1793EUE20+ is available at Aetrix Electronics and suitable for notebook computers, cellular phones, and handheld instruments requiring stable component supply with RoHS-compliant packaging and automotive-grade traceability options.

Supply support for MAX1793EUE20+ 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, communications, and consumer applications.

The MAX1793 belongs to Maxim's high-performance LDO family targeting portable equipment - engineered for ultra-low IQ, low noise, and integrated system-level functions like reset and thermal protection in minimal footprint packages.

FAQ

What is the guaranteed dropout voltage for MAX1793EUE20+ at 1A load?

The guaranteed maximum dropout voltage for MAX1793EUE20+ at 1A load is 270mV, defined as VIN – VOUT when VOUT drops 100mV below its nominal value measured at VIN = VOUT(NOM) + 0.5V. This ensures reliable regulation down to VIN = 2.27V, critical for extending runtime in Li-ion and multi-cell alkaline battery systems. The MAX1793EUE20+ achieves this using a p-channel MOSFET pass element with low RDS(ON).

How does the SET pin configure output voltage on MAX1793EUE20+?

The SET pin on MAX1793EUE20+ enables Dual Mode™ operation: connecting SET to GND (<50mV) selects the factory-trimmed 2.0V output; applying a resistor divider between OUT and GND sets adjustable output from 1.25V to 5.0V using VOUT = 1.25V × (1 + R1/R2). The MAX1793EUE20+'s SET input bias current is ±100nA, allowing high-value resistors to minimize power loss without compromising accuracy.

What is the function and timing behavior of the RST pin on MAX1793EUE20+?

The RST pin on MAX1793EUE20+ is an open-drain reset output that goes low when VOUT falls below 94% of 2.0V (i.e., 1.88V) and remains low for ≥4ms after VOUT recovers to regulation. A 100kΩ pullup to OUT provides a logic-compatible signal for microcontroller power-on reset. During shutdown, RST is forced low regardless of VOUT level - ensuring consistent system reset behavior across all operating states of MAX1793EUE20+.

Can MAX1793EUE20+ operate with input voltage below 2.5V?

No, MAX1793EUE20+ has a specified minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Input undervoltage lockout activates between 2.0V and 2.3V, disabling regulation to protect internal circuitry. Operation below 2.5V is not characterized or guaranteed - attempting to power MAX1793EUE20+ from a depleted single-cell Li-ion (≤2.5V) or NiMH battery will result in unregulated output or shutdown. The MAX1793EUE20+ requires VIN ≥ 2.5V for functional operation.

What thermal management is required for MAX1793EUE20+ at full 1A load?

At 1A load with 2.5V input and 2.0V output, MAX1793EUE20+ dissipates 0.5W (P = IOUT × (VIN – VOUT)). To sustain 1.5W continuous dissipation (its rated limit), the exposed pad (EP) and pin 10 (GND) must be soldered to a minimum 1in² copper area or multi-via ground plane. Without proper thermal layout, junction temperature may exceed +150°C, triggering thermal shutdown. The MAX1793EUE20+'s TSSOP-EP package relies on this external thermal path - board-level heatsinking is mandatory for full-power operation.