Analog Devices Inc./Maxim Integrated MAX8512ETA+T

Overview

MAX8512ETA+T from Maxim Integrated is an ultra-low-noise, adjustable-output LDO linear regulator with P-channel MOSFET pass element, delivering up to 120mA output current, 120mV dropout at full load, 40μA ground current, and stable operation with only 1μF ceramic output capacitance. It serves as a precision voltage source in noise-sensitive RF and analog signal chains of portable wireless devices.

For engineers reviewing the MAX8512ETA+T datasheet, MAX8512ETA+T pinout, MAX8512ETA+T application, or MAX8512ETA+T equivalent, key selection criteria include its adjustable output (via external FB divider), low 230μVRMS output noise (100Hz–100kHz), 72dB PSRR at 1kHz, thermal shutdown at 160°C, and compatibility with 2mm × 2mm TDFN-EP package layout.

Technical Context

The MAX8512ETA+T uses a 1.225V bandgap reference and error amplifier to regulate output via external feedback resistors connected to the FB pin. Its P-channel MOSFET pass transistor (typ. R_DS(ON) = 1Ω) enables low dropout and eliminates base-drive current, ensuring 40μA quiescent current under light load and <1μA in shutdown.

It integrates overcurrent limiting (130–300mA range), thermal shutdown with 10°C hysteresis, and shutdown logic that disables reference, error amp, and gate drive - placing OUT in high-impedance state. The exposed pad (EP) is internally tied to GND and must be soldered to a thermal ground plane for θ_JA = 83.9°C/W performance.

Key Specifications

Pinout & Package

MAX8512ETA+T is housed in an 8-pin, 2mm × 2mm × 0.8mm TDFN-EP package with exposed pad (EP) internally connected to GND. Thermal performance relies on EP soldering to a large PCB ground plane (θ_JA = 83.9°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A2025PDBVR and MCP1826T-ADJE/OT, the MAX8512ETA+T uniquely balances adjustability, ultra-low-noise operation (230μV_RMS), and compact 2mm × 2mm TDFN packaging - making it optimal for space-constrained, noise-sensitive portable RF designs where V_OUT must be tuned post-layout.

Availability

MAX8512ETA+T is available at Aetrix Electronics and suitable for Bluetooth radios, portable digital cameras, wireless LAN baseband ICs, industrial handheld scanners, and medical wearable sensors requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MAX8512ETA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX8510/MAX8511/MAX8512 family was designed specifically for ultra-low-noise, low-quiescent-current regulation in space-constrained portable electronics - emphasizing RF cleanliness, battery longevity, and minimal external components.

FAQ

What output voltage range can be set with the MAX8512ETA+T?

The MAX8512ETA+T supports adjustable output voltages from 1.5V to 4.5V using an external resistor divider on the FB pin. The formula is V_OUT = 1.225V × (1 + R1/R2), where R2 should be ≤240kΩ and 1% tolerance resistors are recommended. This flexibility allows precise matching to system requirements without stocking multiple fixed-output variants - a key advantage of the MAX8512ETA+T over preset LDOs.

Does the MAX8512ETA+T require a bypass capacitor on the BP pin?

No - the BP (bypass) pin is exclusive to the MAX8510 variant and is not present on the MAX8512ETA+T. The MAX8512ETA+T uses the FB pin for output adjustment and does not incorporate the noise-bypass architecture of the MAX8510. Therefore, no BP capacitor is needed or supported; the MAX8512ETA+T achieves its specified 230μV_RMS noise without it.

What is the thermal performance of the MAX8512ETA+T in its TDFN package?

The MAX8512ETA+T in the 8-pin TDFN-EP package has a junction-to-ambient thermal resistance (θ_JA) of 83.9°C/W when mounted on a standard four-layer PCB with the exposed pad (EP) soldered to a large ground plane. Its junction-to-case (θ_JC) is 37°C/W. To maintain safe operation, ensure the EP is fully connected to copper and avoid exceeding the 0.953W maximum power dissipation at +70°C ambient - critical for sustained 120mA loads in compact enclosures.

How does the MAX8512ETA+T behave during shutdown?

When the SHDN pin is pulled low (≤0.4V), the MAX8512ETA+T disables its voltage reference, error amplifier, gate drive, and pass transistor, reducing supply current to <1μA. The output enters a high-impedance state - neither sourcing nor sinking current. The shutdown exit delay is typically 300μs, and the device resumes regulation only after V_IN stabilizes and the SHDN pin rises above 1.5V. This behavior makes the MAX8512ETA+T ideal for MCU-controlled power sequencing in portable systems.

Can the MAX8512ETA+T be used with ceramic capacitors only?

Yes - the MAX8512ETA+T is explicitly designed for stability with low-ESR ceramic capacitors. A 1μF X7R or X5R ceramic capacitor on both input and output is sufficient across the full -40°C to +85°C temperature range. Larger values improve PSRR and transient response, but Z5U/Y5V dielectrics may require ≥2.2μF below -10°C. No tantalum or electrolytic capacitors are needed - simplifying design and improving long-term reliability compared to legacy LDOs requiring specific ESR ranges.