Analog Devices Inc./Maxim Integrated MAX8559ETA8A+T

Overview

MAX8559ETA8A+T from Maxim Integrated is a dual, low-noise, low-dropout linear regulator delivering 300mA per channel from 2.5V–6.5V input, with factory-preset 1.5V and 3.3V outputs, 32µVRMS output noise, and 60mV dropout at 100mA - used in space-constrained portable electronics requiring clean, independent power rails.

For engineers reviewing the MAX8559ETA8A+T datasheet, MAX8559ETA8A+T pinout, MAX8559ETA8A+T application, or MAX8559ETA8A+T equivalent, key selection criteria include dual independent shutdown control, ultra-low quiescent current (115µA per LDO), TDFN-EP package thermal performance, and compatibility with small ceramic capacitors without mandatory bypass.

Technical Context

The MAX8559ETA8A+T integrates two independent P-channel MOSFET pass transistors (0.6Ω R_DS(ON)) with internal 1.25V bandgap reference and error amplifiers, enabling load-proportional dropout voltage and eliminating base-drive current loss typical of PNP-based regulators. Each LDO features autonomous current limiting (310mA min) and thermal shutdown with 10°C hysteresis.

Its BP pin accepts a 0.01µF ceramic capacitor to form an RC filter that reduces output noise below 32µVRMS (100Hz–100kHz); independent SHDNA/SHDNB inputs allow selective or full shutdown, reducing supply current to 0.01µA when both are low, while maintaining internal reference activation if either is high.

Key Specifications

Pinout & Package

MAX8559ETA8A+T is housed in an 8-pin TDFN-EP package (3mm × 3mm × 0.8mm) with exposed paddle for enhanced thermal dissipation (1951mW max power at +70°C). The exposed paddle must be soldered to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS70245PWPR and ADP5022ACPZ-1-R7, the MAX8559ETA8A+T delivers superior noise performance (32µVRMS vs. ≥45µVRMS), lowest quiescent current (115µA vs. ≥175µA), and smallest footprint options (UCSP 2mm²), making it optimal for ultra-portable, battery-sensitive designs where rail cleanliness and size are primary constraints.

Availability

MAX8559ETA8A+T is available at Aetrix Electronics and suitable for cellular phones, digital cameras, notebook computers, and wireless LAN cards requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX8559ETA8A+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) designs precision analog, mixed-signal, and power-management ICs for high-reliability industrial, communications, and consumer applications.

The MAX8559 product line targets battery-powered portable electronics needing compact, low-noise, dual-rail regulation with independent control - optimized for minimal solution size and extended runtime.

FAQ

What are the factory-preset output voltages of the MAX8559ETA8A+T?

The MAX8559ETA8A+T has fixed, factory-programmed output voltages: OUTA delivers 1.5V and OUTB delivers 3.3V. These values are laser-trimmed during production and require no external resistors or configuration. The "8A" suffix in MAX8559ETA8A+T explicitly denotes this 1.5V/3.3V combination per the Output Voltage Selector Guide in the datasheet.

Does the MAX8559ETA8A+T require an external bypass capacitor on the BP pin?

The MAX8559ETA8A+T does not require the 0.01µF BP capacitor to operate, but its inclusion reduces output voltage noise from 254µVRMS to 32µVRMS (100Hz–100kHz). Omitting the BP capacitor simplifies the design and reduces BOM cost where noise sensitivity is low, though PSRR and transient response remain unaffected.

What is the maximum continuous output current per channel for the MAX8559ETA8A+T?

The MAX8559ETA8A+T delivers up to 300mA continuously per channel (OUTA and OUTB) when using ≥4.7µF ceramic output capacitors and operating within thermal limits. At 100mA load, dropout is 60mV; current limiting activates at 310mA (min), protecting the device during overload or short-circuit conditions.

How does the shutdown functionality work on the MAX8559ETA8A+T?

The MAX8559ETA8A+T features two independent shutdown inputs: SHDNA controls OUTA and SHDNB controls OUTB. Driving either pin low disables its respective LDO and discharges the output through a 385Ω internal resistor. Driving both low shuts down the entire IC, reducing total supply current to 0.01µA while keeping the internal reference off.

What package type and thermal characteristics does the MAX8559ETA8A+T use?

The MAX8559ETA8A+T uses an 8-pin TDFN-EP package (3mm × 3mm) with exposed thermal pad. Its maximum continuous power dissipation is 1951mW at +70°C ambient, with thermal derating of 24.4mW/°C above that temperature. Soldering the exposed pad to the PCB ground plane is mandatory to achieve rated thermal performance.