Analog Devices Inc./Maxim Integrated MAX8559ETAJG+

Overview

MAX8559ETAJG+ 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 2.85V/3.00V outputs, 32µVRMS output noise, and 60mV dropout at 100mA - used in notebook computers and wireless LAN cards for clean, independent power rail generation.

For engineers reviewing the MAX8559ETAJG+ datasheet, MAX8559ETAJG+ pinout, MAX8559ETAJG+ application, or MAX8559ETAJG+ equivalent, key selection criteria include dual independent shutdown control, UCSP/TDFN package compatibility, low-noise performance without BP capacitor dependency, and thermal-shutdown hysteresis of 10°C.

Technical Context

The MAX8559ETAJG+ 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 ultra-low 115µA per-LDO quiescent current. Each regulator features autodischarge via 385Ω internal resistor during shutdown and independent current limiting (310mA min).

Its feedback loop uses internal resistor dividers to set fixed 2.85V and 3.00V outputs; BP pin accepts 0.01µF ceramic capacitor to reduce noise below 32µVRMS (100Hz–100kHz), while PSRR reaches 70dB at 10kHz with C_BP = 0.01µF and C_OUT = 2.2µF.

Key Specifications

Pinout & Package

MAX8559ETAJG+ is supplied in an 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed paddle for thermal dissipation. The package supports reflow soldering per JEDEC J-STD-020 and requires exposed paddle soldering to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A202830PDBVR and NCP1117ST30T3G, the MAX8559ETAJG+ uniquely delivers 300mA dual-rail capability with per-channel shutdown, 32µV_RMS noise via BP pin, and 60mV dropout - making it optimal for portable RF and mixed-signal systems where rail independence and noise integrity are mandatory.

Availability

MAX8559ETAJG+ is available at Aetrix Electronics and suitable for notebook computers, wireless LAN cards, digital cameras, and handheld instruments requiring stable component supply, long-lifecycle support, and lead-free compliance.

Supply support for MAX8559ETAJG+ 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, automotive, and portable applications.

The MAX8559 belongs to Maxim's low-noise LDO family engineered for battery-powered systems needing dual independent rails, ultra-low quiescent current, and sub-50µV noise - targeting space-constrained RF and imaging subsystems.

FAQ

What output voltages does the MAX8559ETAJG+ provide?

The MAX8559ETAJG+ provides factory-preset output voltages of 2.85V on OUTA and 3.00V on OUTB. These values are laser-trimmed during production and guaranteed within ±3% over -40°C to +85°C. No external resistors are required, and the outputs cannot be adjusted. The MAX8559ETAJG+ part number specifically denotes this 2.85V/3.00V combination per the Output Voltage Selector Guide in the datasheet.

Does the MAX8559ETAJG+ require an external bypass capacitor on the BP pin?

Yes, the BP pin requires a 0.01µF low-leakage ceramic capacitor to achieve the specified 32µV_RMS output noise. Without this capacitor, output noise rises to 254µV_RMS. The capacitor must be placed close to the BP pin and GND with short traces. While omitting it reduces solution size, it degrades noise performance significantly - a trade-off only acceptable in non-noise-sensitive applications. The MAX8559ETAJG+ design relies on this BP network for its low-noise claim.

What is the maximum continuous output current per channel for the MAX8559ETAJG+?

The MAX8559ETAJG+ delivers up to 300mA continuous output current per channel (OUTA and OUTB). This rating assumes use of a 4.7µF ceramic output capacitor and proper thermal management - especially critical in the TDFN-EP package, which supports 1.95W power dissipation. At 150mA, a 2.2µF capacitor suffices. Current limiting activates at 310mA (min), protecting the device during short-circuit conditions. The MAX8559ETAJG+ maintains regulation up to this limit without foldback or shutdown.

How does shutdown work on the MAX8559ETAJG+?

The MAX8559ETAJG+ features two independent shutdown inputs: SHDNA controls OUTA, and SHDNB controls OUTB. Driving either pin low disables its respective output and discharges it through a 385Ω internal resistor. Driving both low shuts down the entire IC, reducing total supply current to 0.01µA. Each input has TTL-compatible thresholds (VIH ≥1.6V, VIL ≤0.4V) and draws only 100nA bias current. The MAX8559ETAJG+ does not require external pull-ups; connecting SHDNA/SHDNB to INA/INB enables always-on operation.

What package type is used for the MAX8559ETAJG+?

The MAX8559ETAJG+ is packaged in an 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed thermal pad. The "+" suffix denotes lead-free (RoHS-compliant) finish. This package differs from the UCSP variant (e.g., MAX8559EBAJG+) and offers higher power dissipation (1951mW vs. 379mW) and easier assembly. The exposed paddle must be soldered to the PCB ground plane to ensure thermal reliability and meet the +160°C thermal-shutdown specification. The MAX8559ETAJG+ pinout matches the standard TDFN top view with pin 1 marked by a "+" sign on lead-free units.