Analog Devices Inc./Maxim Integrated MAX8511EXK15+T

Overview

MAX8511EXK15+T from Maxim Integrated is a 1.5V fixed-output, ultra-low-noise, low-dropout linear regulator delivering up to 120mA 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 cap), and targets space-constrained battery-powered systems such as Bluetooth radios and digital cameras.

For engineers reviewing the MAX8511EXK15+T datasheet, MAX8511EXK15+T pinout, MAX8511EXK15+T application, or MAX8511EXK15+T equivalent, key selection criteria include its 1.5V preset output, SC70-5 package footprint, 72dB PSRR at 1kHz, 230μVRMS output noise (100Hz–100kHz), and shutdown current <1μA - all critical for low-power RF and portable audio subsystems.

Technical Context

The MAX8511EXK15+T implements a P-channel MOSFET series pass transistor with 1Ω typical R_DS(ON), eliminating base-drive current and enabling stable 40μA quiescent operation across load and temperature. Its internal feedback divider fixes V_OUT = 1.5V, and SHDN logic (0.4V low / 1.5V high) controls enable/disable with 300μs exit delay.

No BP pin is present - unlike the MAX8510 - so noise reduction relies solely on 1μF ceramic output capacitance and inherent architecture. Thermal shutdown activates at +160°C with 10°C hysteresis, and current limiting is guaranteed between 130mA (min) and 300mA (max).

Key Specifications

Pinout & Package

MAX8511EXK15+T is housed in a 5-pin SC70 package (2.0mm × 1.25mm × 0.95mm height), with exposed pad omitted - distinct from the TDFN variant. The package supports reflow soldering per JEDEC J-STD-020 (260°C peak).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B152MR-G and ADP160ACBZ-1.5-R7, the MAX8511EXK15+T uniquely balances ultra-low noise (230μVRMS), integrated shutdown, SC70-5 size, and 120mV dropout - making it optimal for RF-critical, space-limited portable electronics requiring both performance and control.

Availability

MAX8511EXK15+T is available at Aetrix Electronics and suitable for Bluetooth portable radios, digital cameras, personal stereos, portable medical sensors, and other battery-powered applications requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MAX8511EXK15+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, communications, and consumer applications.

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

FAQ

What is the output voltage tolerance of the MAX8511EXK15+T over temperature and load?

The MAX8511EXK15+T guarantees ±3% output voltage accuracy across the full -40°C to +85°C operating temperature range and for load currents from 100μA to 80mA. At +25°C and 1mA load, accuracy tightens to ±1%. This ensures reliable operation for 1.5V I/O domains in portable microcontrollers without external trimming.

Does the MAX8511EXK15+T require a bypass capacitor on the BP pin?

No - the MAX8511EXK15+T does not include a BP (bypass) pin. Unlike the MAX8510, it achieves its 230μVRMS output noise without an external bypass capacitor, simplifying layout and reducing component count. Only input and output 1μF ceramic capacitors are required for stability.

What is the maximum input voltage rating for the MAX8511EXK15+T?

The MAX8511EXK15+T has an absolute maximum input voltage of +7V (IN to GND), but its specified operating input range is 2V to 6V. Operating above 6V risks exceeding safe power dissipation limits, especially at high ambient temperatures or heavy loads - design margin should maintain VIN ≤ 6V.

How does the shutdown function behave on the MAX8511EXK15+T?

When SHDN is pulled low (≤0.4V), the MAX8511EXK15+T disables its voltage reference, error amplifier, and pass transistor, placing the OUT pin in high-impedance state with supply current dropping below 1μA. Exit delay is 300μs typical, and SHDN logic thresholds (0.4V low / 1.5V high) ensure robust interfacing with 1.8V and 3.3V microcontroller GPIOs.

Can the MAX8511EXK15+T be used with ceramic capacitors smaller than 1μF?

No - the MAX8511EXK15+T is characterized and guaranteed stable only with ≥1μF ceramic output capacitance (X5R/X7R dielectric). Using smaller values risks instability, excessive ringing on load transients, or failure to meet PSRR/noise specifications. Input capacitance must also be ≥1μF for proper line rejection and startup behavior.