Analog Devices Inc./Maxim Integrated MAX8865TEUA

Overview

MAX8865TEUA from Maxim Integrated is a dual, low-dropout linear regulator IC delivering two independent 3.15V fixed outputs (T-version) with up to 100mA per channel, operating from +2.5V to +5.5V input. It features 55mV dropout at 50mA, 145µA operating supply current, and Dual Mode™ operation enabling fixed or adjustable output configuration. It is used in cellular phones and PCMCIA cards for stable dual-rail power management.

For engineers reviewing the MAX8865TEUA datasheet, MAX8865TEUA pinout, MAX8865TEUA application, or MAX8865TEUA equivalent, key selection criteria include dropout voltage under load, shutdown supply current, thermal shutdown behavior, reverse battery protection, and compatibility with ceramic output capacitors in µMAX packaging.

Technical Context

The MAX8865TEUA integrates two independent P-channel MOSFET pass transistors (1.1Ω typical R_DS(ON)) with shared 1.25V bandgap reference and thermal sensor. Each regulator uses an error amplifier comparing SET_ voltage against the reference to drive its MOSFET driver, supporting either internal feedback (for 3.15V fixed output) or external resistor divider (1.25V–5.5V adjustable).

Dual Mode™ comparator selects feedback path based on SET_ voltage threshold (60mV); below this, internal resistors set output to 3.15V. Shutdown logic disables individual regulators via active-low SHDN1/SHDN2, reducing total supply current to 0.16nA when both are off - critical for battery longevity in portable systems.

Key Specifications

Pinout & Package

MAX8865TEUA is housed in an 8-pin µMAX package (3.05mm × 3.05mm × 0.91mm, 0.65mm pitch), optimized for space-constrained portable designs. Thermal resistance θ_JA = 244°C/W requires connection of GND pin to large copper area for reliable 100mA operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76633 and ADP3335ARMZ-3.3, the MAX8865TEUA uniquely delivers two independently controllable 3.15V rails in one µMAX package with reverse battery protection and Dual Mode™ flexibility - reducing component count and PCB area while enhancing system-level power management.

Availability

MAX8865TEUA is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, and palmtop computers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX8865TEUA 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 high-reliability industrial, communications, and portable applications.

The MAX8865 series belongs to Maxim's low-quiescent-current LDO family, engineered specifically for battery-powered portable equipment where extended runtime, small footprint, and robust fault protection are mandatory.

FAQ

What output voltage does the MAX8865TEUA deliver?

The MAX8865TEUA delivers two independent 3.15V fixed outputs - confirmed by its "T" suffix designation and internal feedback resistors. This voltage is set when both SET1 and SET2 pins are tied to GND. The device also supports adjustable outputs (1.25V–5.5V) via external resistor dividers on the SET pins, but the MAX8865TEUA is configured and specified for 3.15V operation in its standard use case.

Does the MAX8865TEUA include reverse battery protection?

Yes, the MAX8865TEUA includes integrated reverse battery protection that limits reverse current to less than 1mA when VIN or any SHDN pin falls below GND. This protection disconnects internal circuitry and parasitic paths to prevent battery damage and IC overheating - a critical feature for consumer handheld devices where battery polarity reversal is a real risk during replacement or charging.

Can both outputs of the MAX8865TEUA be shut down independently?

Yes, the MAX8865TEUA provides fully independent shutdown control via SHDN1 and SHDN2 pins. Driving either pin low disables its corresponding regulator (OUT1 or OUT2) while leaving the other fully operational. This enables precise power sequencing and dynamic rail management - for example, keeping a real-time clock supply active while shutting down the main processor rail - without requiring external logic or additional components.

What is the dropout voltage specification for the MAX8865TEUA?

The MAX8865TEUA has a dropout voltage of 55mV at 50mA load per channel, defined as (VIN – VOUT) when VOUT drops 100mV below its nominal value. This ultra-low dropout enables operation down to VIN = 3.205V while maintaining 3.15V output - significantly extending usable battery voltage range in single-cell Li-ion systems compared to conventional LDOs with >200mV dropout.

Is the MAX8865TEUA pin-compatible with the MAX8866TEUA?

No, the MAX8865TEUA is not pin-compatible with the MAX8866TEUA. While both share the same 8-pin µMAX package and pinout numbering, the MAX8866TEUA includes auto-discharge circuitry on its SHDN pins - a function absent in the MAX8865TEUA. Using MAX8866TEUA in a MAX8865TEUA design may cause unintended output discharge during shutdown, potentially disrupting downstream circuit behavior. Always verify functional equivalence beyond physical pin alignment.