Analog Devices Inc./Maxim Integrated MAX8559ETAJ1+

Overview

MAX8559ETAJ1+ 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 - used in battery-powered portable electronics requiring clean, compact dual-rail power.

For engineers reviewing the MAX8559ETAJ1+ datasheet, MAX8559ETAJ1+ pinout, MAX8559ETAJ1+ application, or MAX8559ETAJ1+ equivalent, key selection criteria include factory-preset dual outputs (2.85V/2.85V), TDFN-EP package thermal performance, PSRR of 70dB at 10kHz, and operation without mandatory bypass capacitor on BP.

Technical Context

The MAX8559ETAJ1+ 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 and ultra-low quiescent current (115µA per LDO). Its autodischarge circuitry pulls each output to GND via 385Ω during shutdown.

It features dual independent shutdown inputs (SHDNA/SHDNB), thermal shutdown at +160°C with 10°C hysteresis, and channel-to-channel isolation >60dB at 10kHz. The BP pin accepts a 0.01µF ceramic capacitor to form an RC filter that reduces broadband noise below 32µVRMS (100Hz–100kHz).

Key Specifications

Pinout & Package

MAX8559ETAJ1+ uses an 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed paddle for thermal dissipation. The package is lead-free and RoHS-compliant, with pin 1 marked by a "+" sign.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A2028PDQNR and ADP125ARHZ-2.85-R7, the MAX8559ETAJ1+ uniquely delivers matched dual 2.85V outputs with independent control, integrated noise filtering via BP, and thermal protection - making it the only option for space-constrained dual-rail portable designs requiring <35µVRMS noise.

Availability

MAX8559ETAJ1+ is available at Aetrix Electronics and suitable for cellular handsets, digital cameras, notebook subsystems, and wireless LAN cards requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MAX8559ETAJ1+ 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, low-I_Q LDO family engineered specifically for battery-powered portable electronics where dual-rail efficiency, small footprint, and signal integrity are critical.

FAQ

What output voltages does the MAX8559ETAJ1+ provide?

The MAX8559ETAJ1+ is factory-configured with identical 2.85V outputs on both channels (VOUTA = VOUTB = 2.85V), as indicated by the "JJ" suffix in the Output Voltage Selector Guide. This fixed dual-output configuration eliminates external feedback resistors and ensures tight matching (<±2%) across temperature and load.

Can the MAX8559ETAJ1+ operate without the BP bypass capacitor?

Yes, the MAX8559ETAJ1+ functions without the 0.01µF BP capacitor, but output noise increases from 32µVRMS to 254µVRMS (100Hz–100kHz). The BP pin is optional for cost- or space-constrained designs where ultra-low noise is not required - the device remains stable and fully operational.

What is the maximum power dissipation capability of the MAX8559ETAJ1+ in its TDFN package?

The MAX8559ETAJ1+ in the 8-pin TDFN-EP package supports up to 1951mW continuous power dissipation at +70°C ambient, derating by 24.4mW/°C above that temperature. The exposed paddle must be soldered to a solid ground plane to achieve this rating and maintain junction temperature below +150°C.

Does the MAX8559ETAJ1+ require specific output capacitor types or values?

Yes - the MAX8559ETAJ1+ is optimized for ceramic capacitors. For 300mA loads, use ≥4.7µF X7R/X5R ceramics on each output; for ≤150mA, 2.2µF suffices. Tantalum capacitors are not recommended due to ESR and reliability concerns. Minimum ESR is not specified, but low-ESR ceramics ensure stability across -40°C to +85°C.

How does shutdown behavior differ between single and dual shutdown activation on the MAX8559ETAJ1+?

When only SHDNA or SHDNB is pulled low, the corresponding LDO shuts down and its output is discharged to GND via 385Ω; the other LDO remains active. When both SHDNA and SHDNB are low, both LDOs and the internal reference turn off, reducing total supply current to 0.01µA - enabling deep-sleep modes in portable systems.