Analog Devices Inc./Maxim Integrated MAX8556ETE+TG11

Overview

MAX8556ETE+TG11 from Maxim Integrated is a 4A ultra-low-input-voltage LDO regulator with p-channel MOSFET pass device, adjustable output (0.5V to VIN − 0.2V), 100mV typical dropout at 4A, ±1% output accuracy over load/line/temperature, and integrated Power-OK (POK) output. It operates from 1.425V–3.6V input and targets point-of-load regulation in high-density server and optical module power supplies.

For engineers reviewing the MAX8556ETE+TG11 datasheet, MAX8556ETE+TG11 pinout, MAX8556ETE+TG11 application, or MAX8556ETE+TG11 equivalent, key selection criteria include guaranteed 4A output under low VIN, POK monitoring capability, thermal shutdown behavior, and TQFN-16 (5mm × 5mm) package thermal performance with exposed paddle.

Technical Context

The MAX8556ETE+TG11 uses an internal 25mΩ p-channel MOSFET pass transistor, eliminating need for charge pump or external bias supply and enabling stable operation down to 1.425V input. Its error amplifier regulates FB to 0.5V with ±5mV threshold accuracy, and POK logic monitors VOUT against ±10% window with 50μs glitch immunity delay.

Protection architecture includes foldback current limiting (3A max short-circuit current), thermal shutdown at +160°C (re-enable at +115°C), and undervoltage lockout (1.35V rising threshold). Shutdown mode reduces GND current to 150μA max via EN pin control.

Key Specifications

Pinout & Package

Package: 16-pin TQFN (5mm × 5mm) with exposed thermal paddle (EP), RoHS-compliant, lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A8300RGRT and LT3086EFE#PBF, the MAX8556ETE+TG11 uniquely combines 4A capability, 1.425V minimum input, 100mV dropout, and ±10% POK with 50μs glitch immunity-making it optimal for thermally constrained, high-reliability point-of-load systems requiring verified power-good status.

Availability

MAX8556ETE+TG11 is available at Aetrix Electronics and suitable for server point-of-load regulation, optical module bias supply, base station RF front-end, ATE load board power, and networking infrastructure requiring stable component supply across extended temperature ranges.

Supply support for MAX8556ETE+TG11 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 industrial, communications, computing, and automotive markets.

The MAX8556 product line delivers ultra-low-input-voltage LDOs optimized for high-current, low-dropout point-of-load regulation in thermally demanding infrastructure equipment.

FAQ

What is the minimum input voltage supported by the MAX8556ETE+TG11?

The MAX8556ETE+TG11 supports a minimum input voltage of 1.425V, enabling direct regulation from single-cell Li-ion batteries or low-voltage intermediate bus rails. This specification is guaranteed across the full operating temperature range (−40°C to +105°C) and is critical for applications where input headroom is severely constrained. The device maintains regulation and specified dropout performance down to this limit due to its internal p-channel MOSFET architecture.

Does the MAX8556ETE+TG11 include built-in protection features?

Yes, the MAX8556ETE+TG11 integrates short-circuit protection with foldback current limiting (3A max), thermal-overload protection with +160°C shutdown and +115°C restart hysteresis, undervoltage lockout (1.35V rising threshold), and logic-controlled shutdown. These protections operate independently of external components and are fully characterized across temperature, ensuring robust operation in mission-critical power systems without additional discrete circuitry.

How does the POK output on the MAX8556ETE+TG11 function?

The POK output on the MAX8556ETE+TG11 is an open-drain signal that goes high-impedance when the regulated output is within ±10% of its nominal value and remains low during faults or shutdown. It includes 50μs internal glitch immunity to prevent false triggering from transient noise. The MAX8556ETE+TG11 POK requires an external pullup resistor to a logic supply ≤3.6V and directly interfaces with microcontroller reset inputs or FPGA configuration sequencers.

What package type and thermal considerations apply to the MAX8556ETE+TG11?

The MAX8556ETE+TG11 uses a 16-pin TQFN (5mm × 5mm) package with exposed thermal paddle. For reliable 4A operation, the EP must be soldered to a large GND plane using ≥9 thermal vias (12mil diameter, 1mil plating) per JEDEC JESD51-5/7 standards. At +70°C ambient, maximum power dissipation is 2667mW; proper PCB layout can increase this by routing heat into internal copper layers.

Can the MAX8556ETE+TG11 be used in adjustable-output configurations?

Yes, the MAX8556ETE+TG11 supports adjustable output voltages from 0.5V to VIN − 0.2V using an external resistor divider connected to the FB pin, which is regulated to 0.5V ±5mV. The feedback network must use R3 ≤ 1kΩ for light-load stability, and R2 is calculated as R2 = R3 × (VOUT/0.5V − 1). This flexibility allows precise tailoring of output voltage for diverse ASIC, FPGA, and analog load requirements.