MAX4070ATA+T

Instrumentation, Op Amps, Buffer Amps Overview

The MAX4070ATA+T is a bidirectional, high-side current-sense amplifier featuring an internal 2.5V reference. It operates from a single 3.6V to 24V supply with a common-mode voltage range of 1.35V to 24V independent of the supply. The device offers selectable gains of 50V/V or 100V/V via the GSEL pin and achieves a total output error of less than 1.5%. Supply current is 100µA, dropping to 10µA in shutdown mode. It is housed in an 8-pin Thin QFN package and specified over an operating temperature range of -40°C to +125°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Bidirectional high-side current sensing with integrated 2.5V reference
• Wide 1.35V to 24V common-mode input range independent of supply voltage
• Low power consumption with 100µA active supply current and 10µA shutdown current
• Selectable gain configuration of 50V/V or 100V/V

Instrumentation, Op Amps, Buffer Amps Applications

• Notebook fuel gauging
• Smart-battery packs and chargers
• Cell-phone battery-current monitoring
• Motor control systems
• Power-management systems

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix 'ATA' corresponds to the 8-pin Thin QFN-EP package when sourcing. Confirm RoHS compliance status as indicated by the '+' designation. Ensure the supply voltage meets the minimum 3.6V requirement due to the internal 2.5V reference. Check for obsolescence status as this component series may be discontinued.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select the MAX4070ATA+T when a fixed 2.5V reference is required for bidirectional current monitoring. It is suitable for applications where the supply voltage is at least 3.6V. Compare against MAX4069 for adjustable references or MAX4071 for a 1.5V reference if lower supply voltages are needed. Ensure the gain selection matches the desired dynamic range for charge and discharge currents.

Instrumentation, Op Amps, Buffer Amps Part Context

This component belongs to the MAX4069–MAX4072 family of low-cost, bidirectional, high-side current-sense amplifiers designed for portable equipment. The MAX4070 variant specifically integrates a 2.5V reference, distinguishing it from the adjustable MAX4069, the 1.5V reference MAX4071, and the external reference MAX4072. All devices share similar electrical characteristics regarding common-mode range and supply current.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

MAX4070AUA+ (8-pin µMAX package)

Instrumentation, Op Amps, Buffer Amps FAQ

How does the MAX4070 indicate current direction?

The output voltage indicates polarity relative to the internal 2.5V reference. Charging current produces an output voltage from 2.5V to VCC, while discharge current produces an output voltage from 2.5V to GND.

What is the minimum supply voltage for the MAX4070?

The MAX4070 requires a minimum supply voltage of 3.6V because it contains an internal 2.5V reference.