Analog Devices Inc./Maxim Integrated MAX4492AUD+

Overview

MAX4492AUD+ from Maxim Integrated is a quad, rail-to-rail input/output CMOS operational amplifier optimized for low-voltage, high-slew-rate signal conditioning in automotive-grade systems. It operates from a single 2.7V to 5.5V supply, delivers 10V/µs slew rate and 10MHz gain-bandwidth product, drives 2kΩ loads to within 55mV of either rail, and is unity-gain stable with up to 300pF capacitive load - deployed in high-side current sensing and battery-powered instrumentation.

For engineers reviewing the MAX4492AUD+ datasheet, MAX4492AUD+ pinout, MAX4492AUD+ application, or MAX4492AUD+ equivalent, key selection criteria include its guaranteed -40°C to +125°C operation, 50pA input bias current, rail-to-rail common-mode range (VSS to VDD), output swing capability under 2kΩ load, and TSSOP-14 package compatibility with space-constrained automotive PCB layouts.

Technical Context

The MAX4492AUD+ integrates four independent amplifiers sharing a common substrate tied to VSS, each featuring parallel N- and P-channel differential input stages enabling true rail-to-rail input common-mode voltage range (VSS to VDD). Its class-AB push-pull output stage supports ±50mA short-circuit current and maintains 1.5mV output offset from rails under 100kΩ load.

It exhibits 12nV/√Hz voltage-noise density and 1fA√Hz current-noise density at 10kHz, with 100dB PSRR and 75dB CMRR over temperature. Input capacitance is 5pF per amplifier, requiring careful feedback network design (R′ < 3kΩ recommended) to preserve phase margin near its 10MHz unity-gain bandwidth.

Key Specifications

Pinout & Package

MAX4492AUD+ is housed in a 14-pin TSSOP package (JEDEC MO-153, 5.0mm × 4.4mm × 1.2mm), surface-mount compatible with standard reflow profiles and IPC-7351B land patterns.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad op amp applications.

Compared with TLV2464IDR and AD8604ARUZ, MAX4492AUD+ uniquely balances high-speed performance (10V/µs), rail-to-rail operation, 300pF capacitive-load stability, and AEC-Q100 Grade 2 qualification - making it the only option among the three for automotive current-sensing and RF envelope tracking where all four attributes are mandatory.

Availability

MAX4492AUD+ is available at Aetrix Electronics and suitable for automotive electronics, battery-powered instrumentation, and RF power amplifier control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4492AUD+ 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 MAX4492AUD+ belongs to Maxim's rail-to-rail I/O op amp family engineered specifically for low-voltage, high-speed signal conditioning in automotive and portable systems where supply headroom is constrained and thermal robustness is essential.

FAQ

What is the maximum capacitive load the MAX4492AUD+ can drive without external compensation?

The MAX4492AUD+ is unity-gain stable with capacitive loads up to 300pF when driving a 100kΩ resistive load, as verified in the manufacturer's Typical Operating Characteristics (Figure 4). This eliminates the need for series isolation resistors in DAC output buffering or LCD bias applications. For loads exceeding 300pF, a 10Ω series resistor at the output is recommended to restore phase margin, though it introduces minor gain error.

Does the MAX4492AUD+ support dual-supply operation, and what are the limits?

Yes, the MAX4492AUD+ supports dual-supply operation from ±1.35V to ±2.75V, as specified in the General Description and Absolute Maximum Ratings. In dual-supply mode, VSS connects to the negative rail and VDD to the positive rail; the input common-mode range extends from VSS to VDD, and output swing remains rail-to-rail. Total supply current remains ~3.2mA at ±2.75V, matching single-supply consumption at 5.5V.

How does the input stage architecture of the MAX4492AUD+ enable rail-to-rail input operation?

The MAX4492AUD+ uses parallel-connected N-channel and P-channel differential input pairs. The N-channel stage activates for common-mode voltages above VSS + 1.2V, while the P-channel stage activates below VDD − 1.2V, overlapping to cover the full VSS-to-VDD range. This architecture ensures continuous transconductance across the rails, avoiding crossover distortion and maintaining 75dB CMRR even at the extremes of the input range.

Is the MAX4492AUD+ pin-compatible with other members of the MAX449x family, such as the MAX4492ASD?

No, the MAX4492AUD+ (TSSOP-14) is not pin-compatible with the MAX4492ASD (SO-14), despite identical electrical specifications and function. While both packages have 14 pins and share identical pin numbering and signal assignments per the Functional Diagrams, the SO-14 has wider lead pitch (1.27mm vs. 0.65mm) and larger body dimensions, requiring separate PCB footprints. Layout reuse is not possible without mechanical redesign.

What is the typical input bias current of the MAX4492AUD+ over its full operating temperature range?

The MAX4492AUD+ guarantees input bias current of ±2.5nA maximum over −40°C to +125°C, with typical value of ±50pA at +25°C. This ultra-low bias current is maintained due to CMOS input topology and is critical for high-impedance sensor interfaces like photodiode transimpedance amplifiers or high-value thermistor bridges, where leakage would otherwise dominate measurement error.