Analog Devices Inc./Maxim Integrated MAX1793EUE15+

Overview

MAX1793EUE15+ from Maxim Integrated is a low-dropout linear regulator (LDO) with fixed 1.5V output, delivering guaranteed 1A load current at ≤210mV dropout (1A), ±1% output voltage accuracy over temperature and load, and ultra-low 125µA ground current - designed for space-constrained, battery-powered systems such as handheld instruments and PDAs.

For engineers reviewing the MAX1793EUE15+ datasheet, MAX1793EUE15+ pinout, MAX1793EUE15+ application, or MAX1793EUE15+ equivalent, key selection criteria include its 16-pin TSSOP-EP package with exposed thermal pad, dual-mode SET pin enabling preset/adjustable operation, integrated 4ms reset output, and thermal-overload protection with 170°C shutdown threshold.

Technical Context

The MAX1793EUE15+ uses an internal p-channel MOSFET pass transistor to achieve low dropout and eliminate base-drive current, enabling stable 1A regulation down to VIN = 2.5V while maintaining only 125µA quiescent ground current. Its Dual Mode™ architecture selects between factory-trimmed 1.5V output (SET = GND) or adjustable mode (1.25V–5.0V) via external resistor divider.

It integrates a precision +1.25V reference, error amplifier, MOSFET driver, and low-VOUT comparator that asserts open-drain RST when VOUT falls below 94% of nominal (1.41V for 1.5V output) with 4ms release delay. Thermal shutdown activates at TJ = +170°C with ~20°C hysteresis, and short-circuit current limit operates at 1.1–3.3A depending on output condition.

Key Specifications

Pinout & Package

MAX1793EUE15+ is housed in a 16-pin thermally enhanced TSSOP package (U16E-3 outline) with exposed pad (EP) soldered to PCB ground plane for optimal thermal performance. The package supports up to 1.5W continuous power dissipation at TA = +70°C (derated 19mW/°C above).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79915DRVR and MCP1825-1502E/DB, MAX1793EUE15+ uniquely delivers 1A at 270mV dropout in a thermally optimized TSSOP-EP package while integrating RST and thermal shutdown - making it the only option among the three qualified for high-current, safety-critical portable designs.

Availability

MAX1793EUE15+ is available at Aetrix Electronics and suitable for handheld instruments, PDAs and palmtop computers, and notebook computer subsystems requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for MAX1793EUE15+ 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 family engineered for battery-powered portable equipment - emphasizing ultra-low ground current, small thermally enhanced packages, and integrated system-level features like reset and thermal protection.

FAQ

What is the maximum input voltage for MAX1793EUE15+?

The MAX1793EUE15+ supports an absolute maximum input voltage of +6V referenced to GND, but its operational input range is specified from +2.5V to +5.5V. Operation outside this range may cause permanent damage or undefined behavior. For reliable 1.5V regulation, VIN must exceed 1.77V (1.5V + 270mV dropout) - though functional margin improves significantly above 2.5V.

Does MAX1793EUE15+ require external capacitors, and what values are recommended?

Yes, MAX1793EUE15+ requires both input and output capacitors for stability and transient response. A 4.7µF ceramic capacitor (low-ESR <0.5Ω) is recommended between IN and GND, and a 6.8µF ceramic capacitor (also <0.5Ω ESR) between OUT and GND. These values ensure loop stability, minimize noise, and support full 1A load step response - deviating risks oscillation or excessive output ripple.

How does the RST output function on MAX1793EUE15+?

The RST output on MAX1793EUE15+ is an open-drain signal that goes low when VOUT drops below 94% of nominal (1.41V), remaining low for at least 4ms after VOUT recovers. It requires a 100kΩ pull-up resistor to OUT or another logic supply. During shutdown (SHDN = GND), RST is forced low. This provides deterministic power-on-reset timing for microcontrollers without external RC networks.

Can MAX1793EUE15+ be used in adjustable-output configuration?

No - MAX1793EUE15+ is factory-trimmed for fixed 1.5V output and lacks internal feedback resistors for other voltages. While the SET pin exists, connecting it to GND selects the preset 1.5V mode; applying a resistor divider will not yield a different output because the internal trim network is hardwired for 1.5V. For adjustable operation, select MAX1793EUE+ (no suffix) or MAX1793EUE-ADJ variants instead.

What thermal design considerations apply to MAX1793EUE15+?

MAX1793EUE15+ uses a TSSOP-EP package with an exposed thermal pad (EP) that must be soldered to a large PCB ground plane (≥1 in² recommended) using multiple thermal vias. GND pin 10 also serves as a heatsink. Failure to properly connect EP and GND limits power dissipation to <1W and risks thermal shutdown at ~1.2A load - whereas proper layout enables full 1.5W dissipation and sustained 1A operation at TA = +70°C.