Analog Devices Inc./Maxim Integrated MAX8559ETAAJ+T

Overview

MAX8559ETAAJ+T from Maxim Integrated is a dual, low-noise, low-dropout linear regulator delivering 300mA per channel with 32µV_RMS output noise, 60mV dropout at 100mA, and independent logic-controlled shutdown inputs. It operates from 2.5V to 6.5V input and provides factory-preset 3.3V/2.85V outputs-ideal for powering RF and analog circuitry in space-constrained portable devices.

For engineers reviewing the MAX8559ETAAJ+T datasheet, MAX8559ETAAJ+T pinout, MAX8559ETAAJ+T application, or MAX8559ETAAJ+T equivalent, key selection criteria include dual-channel independent enable control, ultra-low noise performance without BP capacitor dependency, thermal shutdown at +160°C, and compatibility with ceramic output capacitors as small as 2.2µF for 150mA loads.

Technical Context

The MAX8559ETAAJ+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 features autodischarge via 385Ω internal resistor during shutdown and separate current limiting (310mA min) with continuous short-circuit tolerance.

Its feedback loop uses internal resistor dividers to set fixed 3.3V/2.85V outputs; no external resistors are required. PSRR reaches 70dB at 10kHz with 0.01µF BP bypass, and channel-to-channel isolation exceeds 60dB at 100kHz-critical for mixed-signal SoC power domains.

Key Specifications

Pinout & Package

MAX8559ETAAJ+T is packaged in an 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed paddle for thermal dissipation. The package supports 1.95W power dissipation and requires soldering the exposed pad to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A2033PDBVR and ADP125ARHZ-R7, MAX8559ETAAJ+T uniquely delivers asymmetric factory-set outputs, sub-60mV dropout, and integrated BP noise filtering-enabling single-chip power solutions for noise-critical dual-rail systems where layout area and thermal performance are constrained.

Availability

MAX8559ETAAJ+T is available at Aetrix Electronics and suitable for cellular handset power management, wireless LAN baseband supply, digital camera image sensor bias, and handheld test instrument analog front-end applications requiring stable component supply and long-term production continuity.

Supply support for MAX8559ETAAJ+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 high-performance analog and mixed-signal ICs for power, interface, sensing, and RF applications, with emphasis on miniaturization and energy efficiency.

The MAX8559 belongs to Maxim's low-noise LDO family targeting battery-powered portable electronics; it was engineered to replace discrete regulator + filter solutions with integrated dual-channel, low-footprint, thermally robust power management.

FAQ

What output voltages does the MAX8559ETAAJ+T provide?

The MAX8559ETAAJ+T provides factory-preset outputs of 3.3V on OUTA and 2.85V on OUTB. These values are laser-trimmed during production and require no external feedback components. The top-mark "AOM" on the TDFN package confirms this specific voltage combination, and output accuracy is guaranteed at ±3% over -40°C to +85°C with load currents from 0.1mA to 300mA.

Does the MAX8559ETAAJ+T require a BP capacitor for low-noise operation?

The MAX8559ETAAJ+T achieves 32µV_RMS output noise with a 0.01µF ceramic capacitor on the BP pin. However, it remains functional without BP bypass-though output noise rises to 254µV_RMS in that configuration. The BP capacitor is optional and used only when ultra-low noise is mandatory, such as for RF synthesizer supplies or high-resolution ADC references.

How does the MAX8559ETAAJ+T handle thermal overload?

The MAX8559ETAAJ+T incorporates independent thermal detectors per LDO channel. When junction temperature exceeds +160°C, the affected regulator shuts down; it automatically resumes operation once temperature falls by 10°C. This hysteresis prevents oscillation and ensures safe, self-recovering protection during sustained overload or poor PCB thermal design.

Can the MAX8559ETAAJ+T operate with ceramic output capacitors smaller than 4.7µF?

Yes-the MAX8559ETAAJ+T is stable with 2.2µF X5R/X7R ceramic capacitors for loads up to 150mA per channel. For full 300mA capability across the entire -40°C to +85°C range, a minimum 4.7µF output capacitor is required. Using Z5U/Y5V dielectrics may necessitate ≥4.7µF even at 150mA to maintain stability below -10°C.

What is the shutdown current of the MAX8559ETAAJ+T when both SHDNA and SHDNB are asserted?

When both SHDNA and SHDNB are driven low, the MAX8559ETAAJ+T enters deep shutdown mode with total supply current reduced to 0.01µA (typical) at +25°C and ≤0.1µA over -40°C to +85°C. In this state, both LDOs and the internal 1.25V reference are disabled, enabling ultra-low-power retention in battery-backed systems.