Analog Devices Inc./Maxim Integrated MAX8559ETAM1+T

Overview

MAX8559ETAM1+T from Maxim Integrated is a dual, low-noise, low-dropout linear regulator delivering 300mA per channel from 2.5V–6.5V input, with 32µVRMS output noise, 60mV dropout at 100mA, and independent logic-controlled shutdown for each LDO-designed for space-constrained battery-powered systems such as digital cameras and wireless LAN cards.

For engineers reviewing the MAX8559ETAM1+T datasheet, MAX8559ETAM1+T pinout, MAX8559ETAM1+T application, or MAX8559ETAM1+T equivalent, key selection criteria include factory-preset dual-output voltage (1.5V–3.3V), ultra-low quiescent current (115µA per LDO), PSRR of 70dB at 10kHz, thermal/short-circuit protection, and compatibility with small ceramic capacitors without mandatory bypass.

Technical Context

The MAX8559ETAM1+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 and eliminating base-drive current waste typical of PNP-based regulators. Each LDO features autodischarge via 385Ω internal resistor during shutdown and independent feedback dividers for preset output voltages.

Its architecture supports operation without BP capacitor to reduce solution size, while inclusion of BP enables <32µVRMS noise when paired with 0.01µF ceramic. Thermal shutdown activates at +160°C with 10°C hysteresis, and current limiting holds output at ≥310mA min before foldback.

Key Specifications

Pinout & Package

MAX8559ETAM1+T is packaged in an 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed paddle for thermal dissipation. Pin numbering follows JEDEC MO-229 / WEEC standard; Pin 1 is marked by index area and "+" sign on lead-free variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS70245PWP and ADP1740ACPZ-1-R7, the MAX8559ETAM1+T uniquely combines dual independent shutdown, 32µVRMS noise, and 60mV dropout in a single 3mm×3mm TDFN-enabling smaller, quieter, and more power-efficient portable designs without compromising protection or accuracy.

Availability

MAX8559ETAM1+T is available at Aetrix Electronics and suitable for digital cameras, wireless LAN cards, handheld instruments, and cellular phone subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX8559ETAM1+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, automotive, and portable applications.

The MAX8559 belongs to Maxim's low-noise LDO family targeting battery-powered handheld devices-optimized for minimal footprint, ultra-low quiescent current, and robust protection in thermally constrained environments.

FAQ

What output voltages does the MAX8559ETAM1+T provide?

The MAX8559ETAM1+T is a factory-preset dual LDO with fixed output voltages determined by its suffix code. The "M1" variant corresponds to a specific dual-voltage combination listed in Maxim's Output Voltage Selector Guide-e.g., 2.85V/2.85V or 2.85V/3.0V. These values are trimmed during production and require no external resistors. The MAX8559ETAM1+T delivers both outputs simultaneously with ±3% accuracy across -40°C to +85°C.

Can the MAX8559ETAM1+T operate without the BP capacitor?

Yes, the MAX8559ETAM1+T functions without the 0.01µF BP capacitor, reducing component count and PCB area. However, omitting it increases output noise from 32µVRMS to 254µVRMS (100Hz–100kHz). Use BP only when powering noise-sensitive circuits like RF receivers or high-resolution ADCs; for digital-only rails, removal is acceptable and commonly implemented in space-constrained designs.

What is the maximum power dissipation of the MAX8559ETAM1+T in its TDFN package?

The MAX8559ETAM1+T in 8-pin TDFN-EP package has a maximum continuous power dissipation of 1951mW at +70°C ambient, derating by 24.4mW/°C above that temperature. This rating assumes proper thermal design: the exposed paddle must be soldered to a minimum 1.95cm² copper pour on the PCB. Exceeding this limit triggers thermal shutdown at +160°C junction temperature, protecting the device during overload conditions.

How does the MAX8559ETAM1+T handle short-circuit conditions?

The MAX8559ETAM1+T incorporates independent current-limit circuitry for each LDO, clamping output current at ≥310mA (min) before foldback. During sustained short-circuit, the affected regulator enters thermal shutdown at +160°C, cycling on/off with 10°C hysteresis until fault clears. Both outputs can be shorted continuously without permanent damage, and the unaffected LDO continues normal operation-critical for fault-tolerant systems like handheld test equipment.

Is the MAX8559ETAM1+T pin-compatible with other packages in the MAX8559 family?

No, the MAX8559ETAM1+T uses the 8-pin TDFN-EP package, while the UCSP variant (e.g., MAX8559EBAxy*+T) has an 8-bump layout (2.06mm × 1.03mm) with different pin mapping and thermal characteristics. Though functionally identical, they are not mechanically or electrically interchangeable-PCB layout, thermal pad connection, and solder profile must be redesigned when switching between TDFN and UCSP versions of the MAX8559ETAM1+T.