Analog Devices Inc./Maxim Integrated MAX8559ETAO1+T

Overview

MAX8559ETAO1+T from Maxim Integrated is a dual, low-noise, low-dropout linear regulator delivering 300mA per channel with factory-preset outputs of 2.60V (OUTA) and 1.85V (OUTB), operating from 2.5V to 6.5V input. It features 60mV dropout at 100mA, 32µVRMS output noise, 70dB PSRR at 10kHz, and independent logic-controlled shutdown inputs-designed for power sequencing in compact battery-powered systems like digital cameras and handheld instruments.

For engineers reviewing the MAX8559ETAO1+T datasheet, MAX8559ETAO1+T pinout, MAX8559ETAO1+T application, or MAX8559ETAO1+T equivalent, key selection criteria include dual-output voltage pairing, UCSP/TDFN package compatibility, thermal shutdown behavior, and bypass-capacitor–free operation capability.

Technical Context

The MAX8559ETAO1+T integrates two independent P-channel MOSFET pass transistors (0.6Ω R_DS(ON)) with internal 1.25V bandgap reference and error amplifiers. Each LDO employs an internal resistor divider for fixed output voltage, eliminating external feedback components.

Its shutdown architecture supports three operational states: individual LDO disable via SHDNA/SHDNB, full-chip shutdown (<0.01µA supply current), and automatic output discharge (385Ω internal path) during shutdown-enabling precise power domain control without external circuitry.

Key Specifications

Pinout & Package

MAX8559ETAO1+T is packaged in an 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed thermal pad. The package supports high-power dissipation (1.95W) and requires soldering the exposed paddle to PCB ground for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8559ETAO1+T, the alternatives require additional components or compromise on dual-rail independence, output current, or integrated shutdown control-making MAX8559ETAO1+T uniquely suited for space-constrained, dual-voltage, battery-powered systems requiring coordinated power sequencing.

Availability

MAX8559ETAO1+T is available at Aetrix Electronics and suitable for digital cameras, handheld instruments, and notebook platform controller hub designs requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX8559ETAO1+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 MAX8559 product line delivers dual, low-noise, low-dropout regulators optimized for battery-powered portable electronics requiring compact dual-rail power with independent control and minimal external components.

FAQ

What output voltages does the MAX8559ETAO1+T provide?

The MAX8559ETAO1+T provides factory-preset output voltages of 2.60V on OUTA and 1.85V on OUTB. These values are laser-trimmed during production and do not require external feedback resistors. The specific pairing (2.60V/1.85V) is encoded in the part number suffix "O1" per Maxim's Output Voltage Selector Guide, and is confirmed in the device's top-mark "APJ".

Does the MAX8559ETAO1+T require an external bypass capacitor on the BP pin?

The MAX8559ETAO1+T does not require an external capacitor on the BP pin for basic operation, but adding a 0.01µF ceramic capacitor reduces output noise to 32µV_RMS. Without it, noise rises to 254µV_RMS (per Electrical Characteristics table). Designers may omit BP capacitance to save board area when noise sensitivity is low-no stability impact occurs.

What is the maximum continuous output current per channel for the MAX8559ETAO1+T?

The MAX8559ETAO1+T delivers up to 300mA continuously per channel (OUTA and OUTB). This rating assumes use of ≥4.7µF ceramic output capacitors and proper thermal management-especially critical in the TDFN package, which supports 1.95W power dissipation when the exposed pad is soldered to a ground plane.

How does the MAX8559ETAO1+T handle thermal overload?

The MAX8559ETAO1+T incorporates independent thermal detectors per LDO. When junction temperature exceeds +160°C, the affected regulator shuts down; it automatically resumes operation after cooling by 10°C. This hysteresis prevents oscillation. Full-chip shutdown occurs only if both LDOs exceed threshold-ensuring partial functionality remains during localized overheating.

Can the MAX8559ETAO1+T operate without an input bypass capacitor?

No-the MAX8559ETAO1+T requires a minimum 2.2µF ceramic input capacitor (shared between INA and INB) for stability and transient response. Per Applications Information, smaller values risk instability under load transients or elevated temperatures. For 300mA loads across both channels, a 4.7µF input capacitor is recommended to ensure robust operation over the full -40°C to +85°C range.