Analog Devices Inc./Maxim Integrated MAX8511EXK29+T

Overview

MAX8511EXK29+T from Maxim Integrated is a 2.85V fixed-output, ultra-low-noise, low-dropout linear regulator delivering up to 120mA output current with 120mV dropout at full load and 40μA ground current. It uses a P-channel MOSFET pass device, requires only input and output ceramic capacitors (no bypass capacitor), and operates from 2V to 6V input across –40°C to +85°C. It targets noise-sensitive RF and portable power rails in Bluetooth radios and digital cameras.

For engineers reviewing the MAX8511EXK29+T datasheet, MAX8511EXK29+T pinout, MAX8511EXK29+T application, or MAX8511EXK29+T equivalent, key selection criteria include its 2.85V preset output, SC70-5 package footprint, 230μVRMS output noise (100Hz–100kHz), 72dB PSRR at 1kHz, and shutdown current <1μA - all critical for battery-powered, space-constrained designs requiring stable low-noise bias.

Technical Context

The MAX8511EXK29+T implements a P-channel MOSFET series pass transistor with 1Ω typical R_DS(ON), enabling low dropout and eliminating base-drive current loss. Its error amplifier compares a 1.225V bandgap reference against internal feedback to regulate output voltage without external resistors.

Unlike the MAX8510, it omits the BP (bypass) pin and associated noise-reduction capacitor, simplifying layout while accepting higher output noise (230μVRMS vs. 11μVRMS). Shutdown logic disables the reference, error amp, and gate driver, reducing supply current to <1μA and placing OUT in high-impedance state.

Key Specifications

Pinout & Package

MAX8511EXK29+T is housed in a 5-pin SC70 package (2.0mm × 1.25mm × 0.9mm height) with exposed pad omitted - optimized for minimal PCB area in ultra-compact layouts. Pin 1 is IN; Pin 2 is GND; Pin 3 is SHDN; Pin 4 is NC (no internal connection); Pin 5 is OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS78228DRVT and MCP1700-2802E/TO, the MAX8511EXK29+T offers the best balance of ultra-low ground current (40μA), compact SC70 footprint, and moderate noise (230μVRMS) - making it optimal for space- and battery-life-constrained portable RF applications where 2.85V output is required.

Availability

MAX8511EXK29+T is available at Aetrix Electronics and suitable for Bluetooth radios, digital cameras, cellular handsets, portable medical sensors, and other applications requiring stable component supply with tight voltage tolerance and low quiescent current.

Supply support for MAX8511EXK29+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer markets.

The MAX8510/MAX8511/MAX8512 family was designed specifically for ultra-low-noise, low-quiescent-current regulation in space-constrained portable electronics - emphasizing minimal external components, ceramic capacitor compatibility, and robust protection features.

FAQ

What is the output voltage tolerance of the MAX8511EXK29+T over temperature and load?

The MAX8511EXK29+T guarantees ±3% output voltage accuracy across the full operating temperature range (–40°C to +85°C) and load current (100μA to 80mA). At +25°C and 1mA load, accuracy tightens to ±1%. This ensures reliable operation for 2.85V-tolerant ICs like certain RF transceivers and image sensors without requiring post-regulation trimming.

Does the MAX8511EXK29+T require an external bypass capacitor?

No, the MAX8511EXK29+T does not require an external bypass capacitor. Unlike the MAX8510, it omits the BP pin and associated noise-reduction circuitry - simplifying design and reducing component count. Its 230μVRMS output noise (100Hz–100kHz) is achieved without external capacitance, making it ideal for layouts where board area is at a premium.

What is the minimum input voltage required for the MAX8511EXK29+T to maintain regulation at 120mA?

At 120mA load, the MAX8511EXK29+T requires a minimum input voltage of 2.985V to maintain regulation - calculated as V_OUT + V_DROP = 2.85V + 135mV. This low dropout enables extended runtime from single-cell Li-ion batteries, which typically discharge from 4.2V down to ~2.8V under load.

How does the MAX8511EXK29+T behave during shutdown?

When SHDN is pulled low (<0.4V), the MAX8511EXK29+T disables its voltage reference, error amplifier, and gate driver, reducing supply current to <1μA. The output enters a high-impedance state - neither sourcing nor sinking current - allowing safe sharing of the output rail with other regulators or power domains in complex power architectures.

Can the MAX8511EXK29+T be used with X5R or Y5V ceramic capacitors?

Yes, the MAX8511EXK29+T is stable with 1μF X5R or X7R ceramic capacitors across its full operating temperature range. However, Y5V and Z5U dielectrics exhibit large capacitance and ESR shifts below –10°C; for wide-temperature operation with those types, a 2.2μF or larger output capacitor is recommended to ensure stability - per the manufacturer's capacitor selection guidance.