Analog Devices Inc./Maxim Integrated MAX4073TAXK+G65

Overview

MAX4073TAXK+G65 from Maxim Integrated is a high-side current-sense amplifier with voltage output, designed for precision battery-charger current monitoring in portable electronics. It features 20V/V fixed gain, +2V to +28V input common-mode range independent of supply, ±1.0% full-scale accuracy at +25°C, and operates from +3V to +28V single supply. Its 1.8MHz bandwidth supports real-time control in battery-charger feedback loops.

For engineers reviewing the MAX4073TAXK+G65 datasheet, MAX4073TAXK+G65 pinout, MAX4073TAXK+G65 application, or MAX4073TAXK+G65 equivalent, key selection criteria include high-side sensing capability without ground-path disruption, SC70 package footprint constraints, automotive-grade temperature operation (–40°C to +125°C), and compatibility with low-inductance sense resistors for fast transient response.

Technical Context

The MAX4073TAXK+G65 implements a bipolar-based current-mirror architecture that converts differential sense voltage (V_RS+ – V_RS−) into a proportional voltage output without external gain-setting resistors. Its input stage maintains high impedance at RS−, enabling accurate high-side sensing across wide common-mode voltages.

It delivers stable performance under varying supply (3V–28V) and common-mode (2V–28V) conditions, with output settling within 800ns to 1% of final value and power-up time under 5µs. The device avoids phase reversal when overdriven and exhibits 90dB common-mode rejection at 100mV sense voltage.

Key Specifications

Pinout & Package

MAX4073TAXK+G65 is housed in a RoHS-compliant 5-pin SC70 package (outline 21-0076), measuring 2.0mm × 1.25mm × 0.95mm - half the footprint of SOT23 - optimized for space-constrained portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current-sense amplifier applications.

Compared with MAX4073TAUT+T, MAX4073TAXK+G65 saves board area with its SC70 package but sacrifices sub-2V common-mode capability; versus INA213AIDCKR, it delivers superior bandwidth and automotive qualification at the expense of slightly higher gain error tolerance.

Availability

MAX4073TAXK+G65 is available at Aetrix Electronics and suitable for battery charger control loops, smart battery pack monitoring, PA bias regulation, industrial power supply supervision, and portable system current telemetry requiring stable component supply and long-term lifecycle continuity.

Supply support for MAX4073TAXK+G65 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 and mixed-signal ICs for power, sensing, and connectivity applications in industrial, automotive, and communications markets.

The MAX4073 family targets high-side current sensing in space- and power-constrained portable and automotive systems, emphasizing integration, accuracy, and wide operating range without external gain components.

FAQ

What is the exact package type and footprint of MAX4073TAXK+G65?

MAX4073TAXK+G65 uses a 5-pin SC70 package (outline 21-0076) with dimensions 2.0mm × 1.25mm × 0.95mm. Its land pattern is documented as 90-0188 on Maxim's packaging site. This compact size is half that of standard SOT23, making it ideal for dense portable PCB layouts where board space is constrained. The SC70 footprint requires precise stencil design for reliable reflow soldering due to fine pitch and thermal mass characteristics.

Does MAX4073TAXK+G65 support sensing below 2V common-mode voltage?

No, MAX4073TAXK+G65 has a guaranteed common-mode input range of +2V to +28V, independent of supply voltage. It cannot accurately sense currents when the RS+ node falls below +2V. For applications requiring 0V to +28V common-mode operation, the pin-compatible MAX4073TAUT+T in SOT23 is specified - though it uses a larger package. This limitation is inherent to the internal architecture and is not mitigated by external circuitry.

What is the output impedance of MAX4073TAXK+G65 and how does it affect system design?

MAX4073TAXK+G65 has a nominal output impedance of 12kΩ, as confirmed in the Electrical Characteristics table. This means loading the OUT pin with resistances below ~120kΩ introduces measurable gain error - for example, a 12kΩ load causes ~50% gain reduction. System design must therefore use high-impedance ADC inputs or add a unity-gain buffer op amp with rail-to-rail input/output capability to preserve accuracy and avoid signal attenuation.

Can MAX4073TAXK+G65 be used in automotive under-hood applications?

Yes, MAX4073TAXK+G65 is fully specified over the automotive temperature range of –40°C to +125°C and is RoHS-compliant. Its bipolar process technology and tested electrical parameters across this full range confirm suitability for engine-control modules, battery disconnect units, and other under-hood systems where ambient temperatures exceed 105°C. No derating or additional thermal management is required per datasheet specifications.

How does the 1.8MHz bandwidth of MAX4073TAXK+G65 benefit battery-charger control loops?

The 1.8MHz small-signal bandwidth of MAX4073TAXK+G65 ensures minimal phase lag and fast transient response within typical switching charger control loops (usually <500kHz). This allows the charger controller to react rapidly to load changes or fault conditions - such as sudden short-circuit events - improving safety margin and charge efficiency. Measured settling time of 800ns to 1% further supports high-speed current profiling during CC/CV transition phases.