Analog Devices Inc./Maxim Integrated MAX8559ETAKG+T

Overview

MAX8559ETAKG+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 2.80V/3.00V outputs, 60mV dropout at 100mA, and 32µVRMS output noise - used in notebook computers and wireless LAN cards for clean, independent power rail generation.

For engineers reviewing the MAX8559ETAKG+T datasheet, MAX8559ETAKG+T pinout, MAX8559ETAKG+T application, or MAX8559ETAKG+T equivalent, key selection criteria include dual independent shutdown control, UCSP/TDFN package compatibility, low quiescent current (115µA per LDO), PSRR of 70dB at 10kHz, and thermal/short-circuit protection without requiring bypass capacitors.

Technical Context

The MAX8559ETAKG+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-dependent dropout voltage and ultra-low quiescent current independent of load or dropout condition. Each LDO features autodischarge via 385Ω internal resistor during shutdown.

It supports dual logic-controlled shutdown (SHDNA/SHDNB) with 0.4V/1.6V thresholds, delivers 70dB PSRR at 10kHz with 0.01µF BP capacitor, and achieves channel-to-channel isolation >60dB above 10kHz - critical for noise-sensitive mixed-rail systems like digital cameras and handheld instruments.

Key Specifications

Pinout & Package

MAX8559ETAKG+T is packaged in an 8-pin TDFN-EP (3mm × 3mm, exposed paddle), optimized for thermal dissipation in space-constrained portable designs. 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 TPS7A4700RGWR and ADP151ACBZ-2.8-R7, the MAX8559ETAKG+T uniquely delivers matched dual outputs with independent control in one 3mm × 3mm package - eliminating inter-rail coupling, reducing PCB area by 40%, and enabling true per-rail power gating without external logic.

Availability

MAX8559ETAKG+T is available at Aetrix Electronics and suitable for notebook computers, wireless LAN cards, and digital cameras requiring stable component supply, long-lifecycle support, and lead-free packaging.

Supply support for MAX8559ETAKG+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 demanding industrial, communications, and consumer applications.

The MAX8559 belongs to Maxim's low-noise LDO family engineered for battery-powered portable electronics - prioritizing ultra-low quiescent current, minimal solution size, and rail independence in space- and noise-constrained environments.

FAQ

What output voltages does the MAX8559ETAKG+T provide?

The MAX8559ETAKG+T is factory-configured with fixed 2.80V on OUTA and 3.00V on OUTB - no external feedback resistors are needed. These values are laser-trimmed during production and guaranteed over temperature (-40°C to +85°C) and load (0.1mA to 300mA), with ±3% accuracy. The "K" and "G" in the part number directly encode this specific dual-voltage combination per Maxim's Output Voltage Selector Guide.

Does the MAX8559ETAKG+T require a BP capacitor for stable operation?

The MAX8559ETAKG+T operates stably without the 0.01µF BP capacitor, but omitting it increases output noise from 32µVRMS to 254µVRMS (100Hz–100kHz). The BP pin connects to an internal low-pass filter that suppresses reference noise; adding the capacitor is mandatory only when sub-100µVRMS noise is required - e.g., for precision analog sensors or high-resolution ADCs powered by MAX8559ETAKG+T.

How does the MAX8559ETAKG+T handle thermal overload?

The MAX8559ETAKG+T incorporates independent thermal sensors per LDO with a 160°C shutdown threshold and 10°C hysteresis. When either regulator's junction exceeds 160°C, its P-channel pass transistor turns off until the die cools to 150°C, then resumes regulation. This pulsed operation prevents permanent damage during sustained overload - verified up to 1.95W dissipation in the TDFN package with proper PCB copper pour and exposed paddle grounding.

Can the MAX8559ETAKG+T operate from a 2.5V input while delivering 3.00V output?

No - the MAX8559ETAKG+T cannot regulate 3.00V output from a 2.5V input because its minimum input voltage must exceed the output voltage by the dropout margin. At 300mA load, dropout is ~120mV; thus, minimum input for 3.00V output is ~3.12V. However, it can deliver 2.80V from 2.5V input (2.5V − 2.80V = −0.3V < dropout), making OUTA viable in ultra-low-input scenarios where OUTB is disabled.

What is the maximum continuous output current per channel for the MAX8559ETAKG+T?

The MAX8559ETAKG+T delivers up to 300mA continuously per channel (OUTA and OUTB) when using a 4.7µF ceramic output capacitor and within thermal limits. Its internal current limit is 310mA (min), allowing safe short-circuit operation. In the 8-pin TDFN package with properly soldered exposed paddle, thermal design supports full 300mA on both channels simultaneously at +70°C ambient - verified by 1951mW maximum power dissipation rating and derating curve.