Analog Devices Inc./Maxim Integrated MAX4338EUB

Overview

MAX4338EUB from Maxim Integrated is a dual rail-to-rail input/output operational amplifier optimized for 32Ω headphone driver applications in portable, single-supply systems. It delivers 50mA output current per channel, operates from 2.7V to 5.5V, features 5MHz gain-bandwidth product, and includes independent shutdown/mute control (SHDN1/SHDN2) reducing supply current to <0.04μA per amplifier.

For engineers reviewing the MAX4338EUB datasheet, MAX4338EUB pinout, MAX4338EUB application, or MAX4338EUB equivalent, key selection criteria include its 10-pin μMAX package, dual-channel high-output-current capability into low-impedance loads, shutdown-induced high-impedance outputs, and guaranteed rail-to-rail swing at 32Ω - critical for battery-powered audio interface design.

Technical Context

The MAX4338EUB integrates two independent BiCMOS op amps with complementary NPN/PNP input stages enabling true rail-to-rail common-mode input range (GND to VCC) and output swing within 400mV of rails into 32Ω. Each amplifier features thermally protected output stage and smart short-circuit protection limiting current to 110mA only when VOUT > 1V (sinking) or (VCC − VOUT) > 1V (sourcing).

Its shutdown logic accepts standard CMOS thresholds (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC), and each SHDN pin controls one amplifier independently. The device maintains stability with capacitive loads up to 200pF and achieves 70° phase margin at unity gain, supporting robust transient response in DAC buffer and line-driver configurations.

Key Specifications

Pinout & Package

The MAX4338EUB is housed in a 10-pin μMAX package (package code U10+2, outline 21-0061), measuring 3mm × 3mm × 0.8mm with exposed thermal pad. This compact, surface-mount package supports high-density PCB layouts in space-constrained portable devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4410ETE+ and TPA6138A2RTJR, the MAX4338EUB uniquely balances dual-channel integration, independent shutdown, rail-to-rail operation, and 50mA drive in a 10-pin μMAX package - making it optimal for space- and power-constrained stereo audio interfaces where configurability matters.

Availability

MAX4338EUB is available at Aetrix Electronics and suitable for portable audio systems, battery-powered instrumentation, and wireless speaker designs requiring stable component supply, consistent parametric performance across temperature, and RoHS-compliant packaging.

Supply support for MAX4338EUB 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 MAX4335–MAX4338 family was designed specifically for low-voltage, high-output-current audio driver applications - emphasizing rail-to-rail operation, ultra-low shutdown current, and robust thermal protection in miniature packages.

FAQ

What is the maximum output current capability of the MAX4338EUB per channel?

The MAX4338EUB delivers 50mA of continuous output current per channel into 32Ω loads at both 2.7V and 5.5V supply voltages, as verified across the full −40°C to +85°C operating temperature range. Its smart short-circuit protection activates only above 110mA under defined fault conditions, preserving full 50mA drive capability during normal operation.

Does the MAX4338EUB support true rail-to-rail input and output operation?

Yes, the MAX4338EUB supports rail-to-rail input common-mode voltage range (GND to VCC) and rail-to-rail output voltage swing. At VCC = 2.7V into 32Ω, output swing is specified to within 500mV of both rails; at VCC = 5V into 100Ω, it is within 400mV - meeting true rail-to-rail performance for single-supply audio signal chains.

How does the shutdown function work on the MAX4338EUB?

The MAX4338EUB features two independent shutdown pins (SHDN1 and SHDN2). Pulling either pin low disables its corresponding amplifier, reducing supply current to <0.04μA per channel and placing the output in high-impedance state. Logic thresholds are VIH ≥ 0.7×VCC (active) and VIL ≤ 0.3×VCC (shutdown), with enable/disable times of 1μs.

Can the MAX4338EUB drive capacitive loads without oscillation?

Yes, the MAX4338EUB is stable driving capacitive loads up to 200pF with no external compensation required. This is confirmed by characterization data showing no sustained oscillation under these conditions. For loads exceeding 200pF, adding a small series isolation resistor (e.g., 39Ω) restores stability while maintaining signal fidelity.

What package type and footprint does the MAX4338EUB use?

The MAX4338EUB uses a 10-pin μMAX package (outline 21-0061, land pattern 90-0330), measuring 3mm × 3mm × 0.8mm with an exposed thermal pad. It is pin-compatible with other μMAX-packaged dual op amps in the MAX433x family and requires standard reflow soldering profiles for RoHS-compliant assembly.