Analog Devices Inc./Maxim Integrated MAX8511ETA33+T

Overview

MAX8511ETA33+T from Maxim Integrated is a 3.3V, 120mA ultra-low-noise LDO linear regulator in a 2mm × 2mm TDFN-EP package, featuring 120mV dropout at full load, 40μA ground current, and stability with only 1μF ceramic output capacitance. It delivers clean power to noise-sensitive RF and analog circuitry in portable wireless devices.

For engineers reviewing the MAX8511ETA33+T datasheet, MAX8511ETA33+T pinout, MAX8511ETA33+T application, or MAX8511ETA33+T equivalent, key selection criteria include its no-bypass-capacitor architecture, 72dB PSRR at 1kHz, thermal shutdown at 160°C, and guaranteed 120mA output across –40°C to +85°C.

Technical Context

The MAX8511ETA33+T uses a P-channel MOSFET pass transistor (R_DS(ON) ≈ 1Ω) to achieve low dropout and minimal ground current - 40μA at light load and 220μA in dropout - without base-drive losses typical of PNP-based regulators. Its internal feedback divider fixes the output at 3.3V, eliminating external resistors.

No BP pin is present (unlike MAX8510), so noise reduction relies on inherent architecture rather than external bypassing; output noise is 230μV_RMS (100Hz–100kHz). Shutdown logic reduces supply current to <1μA, with SHDN threshold defined at 0.4V (low) and 1.5V (high).

Key Specifications

Pinout & Package

Package: 8-pin TDFN-EP (2mm × 2mm × 0.8mm), exposed pad connected to GND for thermal performance. Pin 1 marked by dot; EP must be soldered to large ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B332MR-G and ADP125ARHZ-3.3-R7, the MAX8511ETA33+T uniquely balances ultra-small 2mm × 2mm size, 120mV dropout at rated current, and no-bypass-capacitor simplicity - making it optimal for miniaturized battery-powered RF systems where board area and component count are critical.

Availability

MAX8511ETA33+T is available at Aetrix Electronics and suitable for Bluetooth portable radios, digital cameras, cellular handsets, and portable audio devices requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MAX8511ETA33+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 communications applications.

The MAX8510/MAX8511/MAX8512 family was engineered specifically for space-constrained, battery-powered RF and portable electronics - prioritizing ultra-low noise, minimal external components, and robust thermal behavior in tiny packages.

FAQ

What is the maximum input voltage rating for the MAX8511ETA33+T?

The MAX8511ETA33+T supports an absolute maximum input voltage of +7V relative to GND. However, its operational input range is specified from 2V to 6V. Exceeding 6V may cause excessive power dissipation or violate safe operating area limits, especially at elevated temperatures or high load currents. Always maintain VIN ≤ 6V for reliable long-term operation of the MAX8511ETA33+T.

Does the MAX8511ETA33+T require an external feedback resistor network?

No, the MAX8511ETA33+T does not require an external feedback resistor network. It is a factory-preset 3.3V regulator with internal feedback - unlike the adjustable MAX8512. The FB pin is absent; only IN, GND, SHDN, OUT, and N.C. pins are functional. This simplifies layout and eliminates resistor tolerance errors affecting output accuracy in the MAX8511ETA33+T.

Can the MAX8511ETA33+T be used with Y5V or Z5U ceramic capacitors?

The MAX8511ETA33+T is not recommended for use with Y5V or Z5U ceramic capacitors in production designs. These dielectrics exhibit large capacitance and ESR shifts below –10°C, potentially causing instability. The datasheet specifies X7R or X5R 1μF ceramics for guaranteed stability across –40°C to +85°C. Using Y5V/Z5U may require ≥2.2μF output capacitance and risks regulation failure at temperature extremes in the MAX8511ETA33+T.

What is the thermal resistance (θ_JA) of the MAX8511ETA33+T in its TDFN package?

The MAX8511ETA33+T in the 8-pin TDFN-EP (2mm × 2mm) package has a junction-to-ambient thermal resistance (θ_JA) of 83.9°C/W when mounted on a standard four-layer JEDEC test board. This value assumes proper connection of the exposed pad (EP) to a large internal ground plane. Without adequate thermal vias and copper area, θ_JA will degrade significantly, directly impacting maximum allowable power dissipation in the MAX8511ETA33+T.

Is the MAX8511ETA33+T pin-compatible with the MAX8510ETA33+T?

No, the MAX8511ETA33+T is not pin-compatible with the MAX8510ETA33+T. While both use the same TDFN-EP package, the MAX8510 includes a BP (bypass) pin (Pin 4), whereas the MAX8511 replaces Pin 4 with N.C. and relocates functionality - resulting in different pin assignments. Interchanging them without board revision will cause incorrect operation or damage due to misrouted signals in the MAX8511ETA33+T.