Analog Devices Inc./Maxim Integrated MAX4484AUK+T

Overview

The MAX4484AUK+T from Maxim Integrated is a single-channel, rail-to-rail output operational amplifier optimized for low-cost, single-supply systems operating from +2.7V to +5.5V. It delivers 7MHz gain-bandwidth, drives 2kΩ loads with <30mV from rails, and remains stable with up to 100pF capacitive load - enabling precision signal conditioning in portable instrumentation and sensor interfaces.

For engineers reviewing the MAX4484AUK+T datasheet, MAX4484AUK+T pinout, MAX4484AUK+T application, or MAX4484AUK+T equivalent, this device is selected for its ground-sensing inputs, no phase reversal under overdrive, 85dB open-loop gain at 2kΩ, and guaranteed operation across –40°C to +125°C industrial temperature range.

Technical Context

The MAX4484AUK+T employs a CMOS input stage with 100GΩ input resistance and pA-level bias current, enabling high-impedance sensor interfacing without loading. Its rail-to-rail output stage uses complementary push-pull architecture to achieve <50mV saturation voltage at 2kΩ load across full temperature range.

Unity-gain stability is achieved via internal compensation optimized for capacitive-load resilience (up to 100pF), while the 20V/µs slew rate and 450ns 0.01% settling time support fast, accurate small- and large-signal transient response in zero-crossing detection and active filtering applications.

Key Specifications

Pinout & Package

The MAX4484AUK+T is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), with 1.6mm × 2.9mm footprint and 0.95mm height - compatible with automated pick-and-place and reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMV321IDBVR and TSV911ICT, the MAX4484AUK+T uniquely balances 7MHz bandwidth, 100pF capacitive-load stability, and –40°C to +125°C operation - making it the only option among the three qualified for harsh-environment zero-crossing and sensor-conditioning roles without layout or calibration trade-offs.

Availability

The MAX4484AUK+T is available at Aetrix Electronics and suitable for electronic ignition modules, infrared remote receivers, portable communicators, sensor signal detection circuits, and single-supply zero-crossing detector designs requiring stable component supply across extended temperature ranges.

Supply support for MAX4484AUK+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 industrial, automotive, and communications applications.

The MAX4484AUK+T belongs to the MAX448x family of single/dual/quad rail-to-rail op amps engineered for cost-sensitive, single-supply systems demanding wide temperature operation and capacitive-load resilience.

FAQ

What is the maximum capacitive load the MAX4484AUK+T can drive without external compensation?

The MAX4484AUK+T is unity-gain stable with capacitive loads up to 100pF, as verified in the manufacturer's Electrical Characteristics table and Typical Operating Characteristics (Figure 2). This eliminates the need for series isolation resistors when driving ADC inputs or long PCB traces, simplifying layout and reducing component count. Exceeding 100pF may cause peaking or oscillation unless compensated per the Applications Information section. The MAX4484AUK+T maintains stability across its full –40°C to +125°C operating range under this condition.

Does the MAX4484AUK+T support true ground-sensing input operation?

Yes, the MAX4484AUK+T features ground-sensing inputs with a common-mode voltage range extending from VSS (0V) to VDD – 1.4V, confirmed in the Electrical Characteristics table (TA = –40°C to +125°C). This allows direct interface with sensors referenced to system ground - such as thermistors, bridge transducers, or current-sense resistors - without level-shifting circuitry. The input stage's CMOS architecture ensures <100pA bias current, minimizing voltage error across high-impedance sources. This capability is intrinsic to the MAX4484AUK+T and does not require external bias networks.

What is the typical supply current consumption of the MAX4484AUK+T at +5.0V operation?

The MAX4484AUK+T draws 2.2mA typical supply current per amplifier at VDD = +5.0V, as specified in the Electrical Characteristics table (TA = +25°C). At VDD = +2.7V, typical current drops to 1.9mA. This quiescent current remains stable across temperature, with measured values of 2.0mA at –40°C and 2.4mA at +125°C (per Typical Operating Characteristics, Figure toc04). The MAX4484AUK+T's current draw is fixed and independent of output loading within rated limits, enabling predictable power budgeting in battery-operated designs.

Can the MAX4484AUK+T be used in a single-supply zero-crossing detector without phase reversal issues?

Yes, the MAX4484AUK+T explicitly guarantees no phase reversal for overdriven inputs, a key feature highlighted in the datasheet's Features list and validated in the Detailed Description section. When configured as a high-gain inverting amplifier with hysteresis, the MAX4484AUK+T maintains correct polarity even if the input exceeds the common-mode range - preventing false zero-crossing pulses caused by internal node saturation. This behavior is inherent to the MAX4484AUK+T's input stage design and requires no external clamping diodes or protection circuitry, simplifying robust detector implementation.

What package type and pin configuration does the MAX4484AUK+T use?

The MAX4484AUK+T uses the 5-pin SOT23-5 package (package code U5-1, land pattern 90-0174), with pin 1 = IN+, pin 2 = IN–, pin 3 = OUT, pin 4 = VSS, and pin 5 = VDD. This matches the functional diagram and Pin Description table in the datasheet, and is distinct from the SC70-5 variant (MAX4484AXK-T). The SOT23-5 footprint is industry-standard, supporting automated assembly and offering better thermal dissipation (571mW at +70°C) than the SC70 variant. The MAX4484AUK+T's pinout is identical across all temperature grades and is not dependent on top-mark codes like ADPE.