Analog Devices Inc./Maxim Integrated MAX4484AXK

Overview

MAX4484AXK from Maxim Integrated is a single-channel, rail-to-rail output operational amplifier optimized for low-voltage, single-supply systems. It delivers 7MHz gain-bandwidth, ±0.3mV typical input offset voltage at +25°C, rail-to-rail output swing within 50mV of supply rails into 2kΩ, and stable operation with up to 100pF capacitive loads - enabling precision signal conditioning in automotive sensor interfaces and portable instrumentation.

For engineers reviewing the MAX4484AXK datasheet, MAX4484AXK pinout, MAX4484AXK application, or MAX4484AXK equivalent, key selection considerations include its -40°C to +125°C operating range, SC70-5 package footprint, ground-sensing inputs, no phase reversal on overdrive, and 2.2mA supply current per amplifier - critical for space-constrained, high-temperature industrial and automotive designs.

Technical Context

The MAX4484AXK employs a unity-gain stable CMOS input stage with ground-sensing capability (input common-mode range extends to VSS), paired with a rail-to-rail output stage capable of sourcing/sinking ≥27mA short-circuit current. Its 55° phase margin and 12dB gain margin ensure stability under varying load conditions, including 100pF capacitive loads without external compensation.

Designed for single-supply operation from +2.7V to +5.5V, the device achieves 85dB large-signal voltage gain into 2kΩ and maintains 62dB minimum CMRR across the full -40°C to +125°C temperature range - supporting robust performance in harsh environments where supply headroom and thermal drift are critical constraints.

Key Specifications

Pinout & Package

The MAX4484AXK is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.5mm pitch), optimized for ultra-compact PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSV911ICT and MCP6001UT-E/OT, the MAX4484AXK provides superior bandwidth (7MHz vs. ≤5.5MHz), tighter offset (±0.3mV vs. ≥±2mV), and guaranteed operation at +125°C - making it the preferred choice for automotive-grade signal conditioning where timing accuracy and thermal robustness are non-negotiable.

Availability

MAX4484AXK is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable instrumentation, and industrial process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4484AXK 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 demanding industrial, automotive, and communications applications.

The MAX4484AXK belongs to Maxim's rail-to-rail op amp product line, engineered specifically for single-supply, high-temperature signal conditioning in automotive and industrial systems where precision, stability, and small footprint are essential.

FAQ

What is the maximum capacitive load the MAX4484AXK can drive without oscillation?

The MAX4484AXK is unity-gain stable with capacitive loads up to 100pF, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure 2). This allows direct connection to ADC inputs, long PCB traces, or EMI filter capacitors without external isolation resistors - a key advantage over many general-purpose op amps that require compensation networks for loads >20pF. The MAX4484AXK maintains phase margin ≥55° under these conditions.

Does the MAX4484AXK support true ground-sensing input operation?

Yes, the MAX4484AXK features ground-sensing inputs with a common-mode voltage range extending to VSS (0V), as specified in the Electrical Characteristics table (VCM = VSS to VDD – 1.3V at +25°C). This enables accurate amplification of signals referenced to system ground in single-supply configurations - such as thermistor bridges or current-sense shunts - without requiring negative supply rails or level-shifting circuitry. The MAX4484AXK maintains 62dB CMRR down to VSS across its full -40°C to +125°C range.

What is the typical supply current consumption of the MAX4484AXK at +5V?

The MAX4484AXK draws 2.2mA typical supply current per amplifier at +5V and +25°C, with a maximum of 3.5mA across temperature and process variation. This value is explicitly listed in the Electrical Characteristics table under "Supply Current per Amplifier (IDD)". At +125°C, IDD increases to 4.0mA max, making the MAX4484AXK suitable for thermally constrained applications where quiescent power must remain below 20mW per channel.

Can the MAX4484AXK be used as a comparator in zero-crossing detector circuits?

Yes, the MAX4484AXK is frequently deployed as a precision zero-crossing detector due to its no-phase-reversal behavior on overdriven inputs, rail-to-rail output swing, and 7MHz bandwidth. Unlike many op amps that invert output polarity when inputs exceed common-mode range, the MAX4484AXK maintains correct polarity - preventing false triggering in AC waveform detection. Its 450ns settling time to 0.01% further ensures accurate timing in high-frequency applications like motor phase sensing.

What package type is used for the MAX4484AXK, and what are its key mechanical dimensions?

The MAX4484AXK uses the SC70-5 package (also referenced as SOT-353), measuring 2.0mm × 1.25mm with 0.5mm lead pitch. This ultra-small outline is documented in the Package Information section and Ordering Information table. Its compact size reduces PCB area by >50% compared to SOT23-5, making it ideal for space-constrained modules such as automotive cabin sensors and wearable medical devices - while maintaining full compatibility with standard reflow soldering processes.