Analog Devices Inc./Maxim Integrated MAX4369EBL+T

Overview

MAX4369EBL+T from Maxim Integrated is a dual, rail-to-rail output operational amplifier in a 9-bump UCSP (1.5mm × 1.5mm), designed for high-output-drive audio buffering and headphone driving. It delivers ±87mA output current at 5V, supports 2.3V–5.5V single-supply operation, achieves 0.03% THD+N at 1kHz into 32Ω, and operates across –40°C to +85°C - enabling compact, low-voltage portable audio systems.

For engineers reviewing the MAX4369EBL+T datasheet, MAX4369EBL+T pinout, MAX4369EBL+T application, or MAX4369EBL+T equivalent, this page provides verified pin functions, real-world audio drive capability metrics, thermal protection behavior, UCSP layout constraints, and validated alternatives for stereo line/headphone driver replacement.

Technical Context

The MAX4369EBL+T integrates two independent high-current op amps with rail-to-rail output stages capable of sourcing/sinking up to ±125mA under 2.7V–5.5V supply conditions. Its unity-gain stability extends to 3.5MHz with 200pF capacitive-load tolerance, and it features internal thermal shutdown activation at 165°C with 10°C hysteresis.

Each amplifier exhibits 96dB PSRR (2.3V–5.5V), 80dB CMRR (0V–VCC−1.0V), and 1mV typical input offset voltage. The device uses bipolar process technology (669 transistors) and requires external biasing at VCC/2 for single-ended audio configurations, with dedicated bump-level ground (B1) and power (B3) terminals.

Key Specifications

Pinout & Package

MAX4369EBL+T uses a 9-bump ultra chip-scale package (UCSP) with bottom-side bumps arranged in a 3×3 grid (B2 unpopulated). The package has no leads or exposed pads; thermal dissipation relies on solder joint conduction to PCB copper. Bump pitch is 0.5mm; recommended reflow profile follows JEDEC J-STD-020A IR/VPR Class 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-output-drive op amp applications.

Compared with MAX4369EBL+T, the TPA6130A2 offers digital control but sacrifices op amp versatility, while the AD8676 provides precision but cannot operate from single 3.3V or drive 16Ω loads - making MAX4369EBL+T uniquely suited for compact, battery-powered stereo buffer applications requiring both rail-to-rail swing and robust thermal management.

Availability

MAX4369EBL+T is available at Aetrix Electronics and suitable for cellular phone audio subsystems, portable media player headphone outputs, PDA speaker drivers, and general-purpose low-voltage analog buffering requiring stable component supply and long-term lifecycle continuity.

Supply support for MAX4369EBL+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 high-performance analog and mixed-signal ICs for power, interface, sensing, and timing applications in industrial, automotive, and consumer markets.

The MAX4369EBL+T belongs to Maxim's high-output-drive audio op amp product line, engineered specifically for space-constrained portable devices needing efficient, low-distortion, single-supply stereo amplification without external boost circuitry.

FAQ

What is the maximum continuous output power of the MAX4369EBL+T into 16Ω and 32Ω loads?

The MAX4369EBL+T delivers 120mW of continuous average power into a 16Ω load and 75mW into a 32Ω load, both measured at 1% THD+N and 1kHz. These values are guaranteed by design and confirmed across the –40°C to +85°C operating range with a 5V supply. Power scales with supply voltage per the output power vs. VCC curves in the datasheet.

Does the MAX4369EBL+T support true rail-to-rail input operation?

No, the MAX4369EBL+T features rail-to-rail *output* swing only. Its input common-mode range is specified from 0V to VCC − 1.0V, meaning it cannot accept signals within 1.0V of the positive rail. For full rail-to-rail input capability, an alternative op amp such as the MAX4477 would be required - but the MAX4369EBL+T's output stage remains fully rail-to-rail, delivering signals within 300mV of VCC and 15mV of GND.

Can the MAX4369EBL+T be used in a bridge-tied load (BTL) configuration?

Yes, the MAX4369EBL+T supports BTL operation using one amplifier as the inverting stage and the other as noninverting, with matched feedback resistors. Figure 3 in the datasheet shows this configuration driving differential outputs into a single speaker. This doubles effective voltage swing and quadruples power into the same load, enabling up to ~240mW into 16Ω with proper thermal management and layout.

What is the recommended supply bypassing scheme for the MAX4369EBL+T?

Place a 0.1µF ceramic capacitor in parallel with a 10µF tantalum or aluminum electrolytic capacitor directly between VCC (B3) and GND (B1), with both components located within 1mm of their respective bumps. This dual-capacitor network suppresses high-frequency noise and sustains transient current demands during peak output, ensuring stable 0.03% THD+N performance across the audio band.

Is thermal shutdown active during normal operation of the MAX4369EBL+T?

No, thermal shutdown activates only when the junction temperature exceeds +165°C - a condition that occurs only under sustained overload (e.g., 120mW into 16Ω at elevated ambient temperature without adequate PCB copper). Under typical operation at 25°C ambient and proper layout, the MAX4369EBL+T remains well below this threshold. Once triggered, the amplifier disables its output stage until junction temperature falls by 10°C.