Analog Devices Inc./Maxim Integrated MAX8559EBAAA+T

Overview

MAX8559EBAAA+T from Maxim Integrated is a dual, low-noise, low-dropout linear regulator delivering 300mA per channel with factory-preset 3.3V outputs, 60mV dropout at 100mA, 32µVRMS output noise, and independent logic-controlled shutdown-designed for power-sensitive portable electronics such as digital cameras and wireless LAN cards.

For engineers reviewing the MAX8559EBAAA+T datasheet, MAX8559EBAAA+T pinout, MAX8559EBAAA+T application, or MAX8559EBAAA+T equivalent, key selection criteria include dual-channel LDO independence, UCSP package footprint constraints, low-noise performance with BP bypass, thermal-shutdown behavior, and compatibility with ceramic output capacitors down to 2.2µF.

Technical Context

The MAX8559EBAAA+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-proportional dropout voltage and ultra-low quiescent current (115µA per LDO). Its autodischarge circuitry pulls each output to GND via 385Ω during shutdown.

It features separate SHDNA/SHDNB inputs with 1.6V VIH and 0.4V VIL thresholds, supports operation without BP capacitor (at cost of higher noise), and delivers 70dB PSRR at 10kHz with 0.01µF BP bypass-critical for RF-sensitive applications like handheld instruments and PCMCIA cards.

Key Specifications

Pinout & Package

MAX8559EBAAA+T is packaged in an 8-bump UCSP (2.06mm × 1.03mm, 0.5mm pitch) with exposed substrate ground connection. The lead-free package uses a "+" sign to indicate Pin 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS70245PWPR and MCP1826S-3302E/DB, the MAX8559EBAAA+T uniquely delivers matched 3.3V outputs with independent shutdown in a 2mm² UCSP-enabling true dual-rail power gating in space-constrained portable designs where fixed-voltage simplicity and minimal solution size are critical.

Availability

MAX8559EBAAA+T is available at Aetrix Electronics and suitable for digital camera power management, wireless LAN card regulation, and handheld instrument power supply applications requiring stable component supply, long-term lifecycle support, and consistent lead-free packaging.

Supply support for MAX8559EBAAA+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 systems-engineered to maximize runtime and signal integrity through ultra-low IQ, P-channel architecture, and integrated noise-reduction features.

FAQ

What output voltage does the MAX8559EBAAA+T provide?

The MAX8559EBAAA+T delivers two independent, factory-preset 3.3V outputs (VOUTA = VOUTB = 3.3V). This is confirmed by the Output Voltage Selector Guide in the datasheet, where "AAA" suffix corresponds to 3.30V/3.30V. The device is nonadjustable-no external feedback resistors are supported.

Does the MAX8559EBAAA+T require a BP bypass capacitor?

The MAX8559EBAAA+T can operate without the 0.01µF BP capacitor, but doing so increases output noise from 32µVRMS to 254µVRMS. The BP pin is optional for size-constrained designs where noise sensitivity is low; however, for digital camera sensors or RF circuits, the BP cap is strongly recommended to achieve specified low-noise performance.

What package type is used for the MAX8559EBAAA+T?

The MAX8559EBAAA+T uses the 8-bump UCSP (Ultra Compact Silicon Package) measuring 2.06mm × 1.03mm with 0.5mm pitch. Per the Ordering Information table, "EBA" prefix denotes UCSP packaging, and the "+T" suffix confirms lead-free finish. The exposed substrate serves as the thermal and electrical ground connection.

How does shutdown work on the MAX8559EBAAA+T?

The MAX8559EBAAA+T provides independent shutdown via SHDNA and SHDNB pins: driving either low disables its respective LDO output, while pulling both low shuts down the entire IC-including the internal reference-reducing total supply current to 0.01µA. Each output is actively discharged to GND through a 385Ω internal resistor during shutdown.

Can the MAX8559EBAAA+T support 300mA load on both channels simultaneously?

Yes-the MAX8559EBAAA+T is rated for 300mA continuous output per channel. However, simultaneous full-load operation requires careful thermal design: in the UCSP package, maximum power dissipation is limited to 379mW. At VIN = 4.5V and VOUT = 3.3V, 300mA per channel yields 720mW total dissipation-exceeding UCSP limits. Use the TDFN variant (1951mW rating) or reduce input voltage for dual 300mA operation.