Analog Devices Inc./Maxim Integrated MAX8517EUB+

Overview

MAX8517EUB+ from Maxim Integrated is a 1A, low-dropout linear regulator with PMOS pass transistor, operating from 1.425V to 3.6V input and delivering adjustable output (0.5V to VIN–0.2V) with ±1.4% accuracy over 0°C to +85°C. It features power-OK (POK) monitoring, 200mV dropout at full load, 320μA quiescent current, and compatibility with 1μF/4.7μF ceramic capacitors - used in post-regulation for high-speed digital cores in optical modules and base stations.

For engineers reviewing the MAX8517EUB+ datasheet, MAX8517EUB+ pinout, MAX8517EUB+ application, or MAX8517EUB+ equivalent, key selection criteria include POK functionality, thermal shutdown behavior, dropout performance under 1A load, and μMAX® package layout compatibility with space-constrained PCBs.

Technical Context

The MAX8517EUB+ uses an internal p-channel MOSFET pass device with 100mΩ typical on-resistance, eliminating base-drive current and enabling stable operation down to 1.425V input without sacrificing transient response. Its error amplifier includes inherent soft-start and supports external feedback via FB pin for precise output voltage setting.

It integrates open-drain POK logic referenced to the FB node, with ±10% output voltage window detection, 50μs fault delay, and active-low assertion during shutdown, short-circuit, or thermal overload. Thermal protection triggers at +165°C junction temperature and resets at +150°C.

Key Specifications

Pinout & Package

The MAX8517EUB+ is housed in a 10-pin μMAX® package (3mm × 5mm) with exposed pad (EP) soldered to PCB ground for optimal thermal dissipation. Pin 10 is internally pulled down to GND via 10kΩ resistor and must be left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and LT3080IMSE#TRPBF, the MAX8517EUB+ uniquely combines 1A output, 200mV dropout, adjustable voltage, and integrated POK in a 3mm×5mm μMAX package - making it optimal for space-constrained, multi-rail digital systems requiring autonomous power sequencing.

Availability

MAX8517EUB+ is available at Aetrix Electronics and suitable for optical modules, base stations, and network switches requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX8517EUB+ 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, communications, and computing applications.

The MAX8516/MAX8517/MAX8518 family targets high-current, low-headroom post-regulation in space-constrained infrastructure equipment - emphasizing thermal robustness, ceramic capacitor compatibility, and integrated system-monitoring features like POK.

FAQ

What is the maximum allowable input voltage for the MAX8517EUB+?

The MAX8517EUB+ supports an absolute maximum input voltage of +4.0V on the IN and EN pins, but its specified operational input range is 1.425V to 3.6V. Exceeding 3.6V may degrade output accuracy and increase power dissipation beyond safe limits, especially at high ambient temperatures. Always maintain VIN ≤ 3.6V for guaranteed performance per the datasheet's Electrical Characteristics table.

Does the MAX8517EUB+ require external components for stability?

Yes, the MAX8517EUB+ requires a minimum 1μF ceramic capacitor between IN and GND, and a 4.7μF ceramic capacitor between OUT and GND for stable operation at 1A output. Smaller output capacitors may be used for reduced load currents (e.g., COUT = IOUT(max) × 1μF/200mA), but omitting or undersizing these capacitors risks oscillation, poor transient response, and failure to meet dropout or accuracy specifications.

How does the POK output of the MAX8517EUB+ behave during shutdown?

During shutdown (EN = GND), the POK output of the MAX8517EUB+ is actively driven low - it does not float or remain high. This behavior ensures unambiguous system-level power status reporting. The POK remains low until EN is asserted high and the output voltage stabilizes within ±10% of its nominal value, with a typical 50μs debounce delay after crossing the threshold.

Can the MAX8517EUB+ be used with an output voltage below 0.5V?

No, the MAX8517EUB+ is not specified or guaranteed for output voltages below 0.5V. Its feedback reference voltage is 500mV ±3mV, and the datasheet explicitly defines the output voltage range as 0.5V to (VIN – 0.2V). Attempting to set VOUT < 0.5V violates the FB threshold specification and results in inaccurate regulation, increased dropout, or instability - confirmed by the "Output Voltage Range" parameter in the Electrical Characteristics table.

What is the thermal resistance (θ_JA) of the MAX8517EUB+ in its μMAX package?

The MAX8517EUB+ in the 10-pin μMAX package has a typical junction-to-ambient thermal resistance (θ_JA) of 122°C/W when mounted on a standard 2-layer PCB with the exposed pad (EP) soldered to a 1-in² copper area. This value assumes no forced airflow; derating begins above +70°C ambient, with 10.3mW/°C reduction in allowable power dissipation. Full thermal design guidance is provided in the "Operating Region and Power Dissipation" section of the datasheet.