Analog Devices Inc./Maxim Integrated MAX8840ELT16+T

Overview

MAX8840ELT16+T from Maxim Integrated is a 1.6V fixed-output, ultra-low-noise, high-PSRR, low-dropout linear regulator delivering up to 150mA output current with 120mV dropout at 120mA load, 11µV_RMS output noise (100Hz–100kHz), and 78dB PSRR at 1kHz - designed for powering noise-sensitive analog circuitry in portable RF and audio subsystems.

For engineers reviewing the MAX8840ELT16+T datasheet, MAX8840ELT16+T pinout, MAX8840ELT16+T application, or MAX8840ELT16+T equivalent, key selection criteria include its µDFN-6 (1.5mm × 1.0mm) package, BP-pin-enabled noise reduction, guaranteed ±3% output voltage accuracy over load/temperature, and sub-1µA shutdown current - critical for battery longevity in space-constrained, low-power systems.

Technical Context

The MAX8840ELT16+T employs a p-channel MOSFET pass transistor (typ. R_DS(ON) = 1Ω) enabling low ground current (40µA typ.) and stable operation without base-drive losses. Its bandgap reference (1.225V) feeds an error amplifier that controls the pass gate via internal feedback, achieving tight regulation across 2V–6V input range.

Noise performance is enhanced by a dedicated BP pin connected to a 10nF capacitor, which shunts high-frequency noise from the bandgap core. Shutdown logic disables the reference, error amp, and gate driver, reducing supply current to <0.05µA at +85°C while placing OUT in high-impedance state.

Key Specifications

Pinout & Package

MAX8840ELT16+T is housed in a lead-free, RoHS-compliant 6-pin µDFN package measuring 1.5mm × 1.0mm × 0.8mm, with exposed thermal pad (GND-connected) for enhanced power dissipation in compact layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B162MR-G and ADP160AUJZ-1.6-R7, the MAX8840ELT16+T uniquely combines µDFN-6 size, 11µV_RMS noise, and BP-capacitor tunability - making it the only option meeting stringent RF/analog noise budgets in sub-2mm² footprints.

Availability

MAX8840ELT16+T is available at Aetrix Electronics and suitable for cellular radios, portable audio devices, digital camera sensors, and low-power MCU subsystems requiring stable component supply with guaranteed long-term availability.

Supply support for MAX8840ELT16+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 MAX8840 series belongs to Maxim's ultra-low-noise LDO family, engineered specifically for powering noise-critical RF, audio, and imaging circuits in battery-constrained portable electronics.

FAQ

What is the maximum input voltage rating for the MAX8840ELT16+T?

The MAX8840ELT16+T has an absolute maximum input voltage of +7V relative to GND. However, its specified operating input range is 2V to 6V. Exceeding 6V may cause functional degradation or reliability issues, even if within absolute max limits. For reliable 1.6V output regulation, maintain VIN ≥ 1.72V (1.6V + 120mV dropout) and ≤ 6V per datasheet specifications.

Does the MAX8840ELT16+T require an external bypass capacitor on the BP pin?

Yes - the MAX8840ELT16+T requires a 10nF capacitor between BP and OUT to achieve its specified 11µV_RMS output noise. Without this capacitor, noise increases to ~230µV_RMS. The BP pin is internally shorted to OUT during shutdown, so the capacitor remains safe and functional across all states. Use X7R or C0G dielectric for temperature stability.

Can the MAX8840ELT16+T be used with ceramic output capacitors smaller than 1µF?

No - the MAX8840ELT16+T is characterized and guaranteed stable only with ≥1µF ceramic output capacitance. Using smaller values risks instability, overshoot, or oscillation under load transients. The 1µF minimum applies across all operating conditions and load currents; lower-ESR ceramics (X7R/X5R) are preferred over Z5U/Y5V for consistent performance across temperature.

What is the output voltage accuracy specification for the MAX8840ELT16+T over temperature and load?

The MAX8840ELT16+T guarantees ±3% output voltage accuracy over the full -40°C to +85°C temperature range and for output currents from 100µA to 80mA. At 25°C and 1mA load, accuracy tightens to ±1%. This tolerance ensures reliable operation of 1.6V logic interfaces and analog references without external trimming or calibration.

How does the shutdown function behave on the MAX8840ELT16+T?

When SHDN is pulled low (<0.4V), the MAX8840ELT16+T disables its voltage reference, error amplifier, and pass transistor gate driver, reducing supply current to <0.05µA at +85°C. The OUT pin enters high-impedance state - no current flows into or out of the output. To re-enable, drive SHDN ≥1.5V; exit delay is typically 300µs with 50Ω load.