Analog Devices Inc./Maxim Integrated MAX8511EXK28+T

Overview

MAX8511EXK28+T from Maxim Integrated is a 2.8V fixed-output, ultra-low-noise, low-dropout linear regulator delivering up to 120mA output current with 120mV dropout at full load, 40μA ground current, and stable operation with only 1μF ceramic output capacitance. It targets noise-sensitive analog and RF power rails in portable wireless devices.

For engineers reviewing the MAX8511EXK28+T datasheet, MAX8511EXK28+T pinout, MAX8511EXK28+T application, or MAX8511EXK28+T equivalent, key selection criteria include its SC70-5 package footprint, absence of bypass capacitor requirement, 2.8V preset output, 72dB PSRR at 1kHz, and guaranteed 120mA output capability under -40°C to +85°C operation.

Technical Context

The MAX8511EXK28+T employs a P-channel MOSFET pass transistor (1Ω typical R_DS(ON)) enabling low dropout and ultra-low quiescent current-40μA at light load and ≤220μA in dropout-without base-drive losses inherent in PNP-based regulators. Its architecture omits the BP (bypass) pin found on the MAX8510, eliminating need for external noise-reduction capacitors.

Shutdown logic reduces supply current to <1μA; thermal shutdown activates at +160°C with 10°C hysteresis. The device achieves 230μV_RMS output noise (100Hz–100kHz) and maintains stability across temperature and load with internal feedback and no external resistor divider required.

Key Specifications

Pinout & Package

MAX8511EXK28+T is housed in a RoHS-compliant, lead(Pb)-free 5-pin SC70 package (2.0mm × 1.25mm × 0.95mm), optimized for space-constrained PCB layouts. The exposed pad is absent-only standard SC70 footprint applies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0528PDBVR and MCP1700-2802E/TO, the MAX8511EXK28+T uniquely balances ultra-low noise (230μV_RMS), low dropout (120mV), and minimal footprint (SC70-5), making it optimal for space- and noise-constrained portable RF/analog systems where 120mA suffices.

Availability

MAX8511EXK28+T is available at Aetrix Electronics and suitable for Bluetooth accessories, digital camera modules, portable medical sensors, and wearable fitness monitors requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for MAX8511EXK28+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 power regulation in battery-powered portable electronics-emphasizing small size, wide input range, and compatibility with ceramic capacitors.

FAQ

What is the output voltage tolerance of the MAX8511EXK28+T over temperature and load?

The MAX8511EXK28+T guarantees ±3% output voltage accuracy over the full -40°C to +85°C operating temperature range and for output currents from 100μA to 80mA. At room temperature and 1mA load, accuracy tightens to ±1%. This ensures reliable operation for precision analog circuits without external calibration.

Does the MAX8511EXK28+T require an external bypass capacitor like the MAX8510?

No, the MAX8511EXK28+T does not require an external bypass capacitor. Unlike the MAX8510-which uses a BP pin and 10nF capacitor to achieve 11μV_RMS noise-the MAX8511EXK28+T omits the BP pin entirely and delivers 230μV_RMS noise with only standard input and output capacitors, simplifying design and reducing component count.

What is the maximum allowable input voltage for the MAX8511EXK28+T?

The MAX8511EXK28+T supports an absolute maximum input voltage of +7V, but its specified operating input range is 2V to 6V. For reliable long-term operation, VIN should remain within 2V–6V; exceeding 6V risks violating SOA limits even if below the 7V absolute max rating.

Can the MAX8511EXK28+T be used with ceramic capacitors smaller than 1μF?

No-stability is guaranteed only with ≥1μF ceramic output capacitance (X5R or X7R dielectric). Using smaller values may cause oscillation or poor transient response. Input capacitance also requires ≥1μF; both capacitors must be placed close to the IN and OUT pins per layout guidelines in the MAX8511EXK28+T datasheet.

How does the shutdown function behave on the MAX8511EXK28+T?

When SHDN is pulled low (<0.4V), the MAX8511EXK28+T disables its voltage reference, error amplifier, and pass transistor, reducing total supply current to <1μA. The OUT pin enters high-impedance state. Startup delay is typically 300μs after SHDN rises above 1.5V, ensuring controlled power-up sequencing in multi-rail systems.