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MAX9938HEUK+T

ADIMAX9938HEUK+T

Analog Devices Inc./Maxim Integrated
Current Sense Amplifier 1 Circuit SOT-23-5
Active1,313 in stock
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Overview

The MAX9938HEUK+T is an ultra-low power current-sense amplifier designed for high-side monitoring in space-constrained applications. It features a remarkably low supply current of 1.1uA and operates over a wide input common-mode range from 1.6V to 28V. This device is optimized for precision with a low input offset voltage of 100uV and is housed in a compact 5-pin SOT23 package.

Why Choose This Part

The primary advantage is the extremely low 1.1uA current consumption, which is significantly lower than standard current-sense amplifiers. It maintains a high level of accuracy with a 0.5 percent gain error and a low 100uV offset voltage, ensuring reliable measurements even at low sense voltages. Its wide 1.6V to 28V input range allows it to be used in various multi-cell battery configurations without additional regulation.

Applications

Battery-Powered Handheld Devices
Ideal for monitoring discharge current in smartphones, tablets, and portable medical instruments where power conservation is critical.
Notebook and Laptop Power Management
Used to track system power consumption from the battery or AC adapter across a broad voltage range.
Energy Harvesting Systems
The 1.1uA quiescent current makes it suitable for monitoring small currents in self-powered wireless sensor nodes.
Smart Battery Packs
Integrates into battery protection circuits to provide accurate fuel gauging data without significantly draining the cells.

Key Specifications

Mounting Type Surface Mount
-3db Bandwidth 30 kHz
Amplifier Type Current Sense
Package / Case SC-74A, SOT-753
Current - Supply 1.1uA
Number of Circuits 1
Operating Temperature -40degC ~ 85degC
Voltage - Input Offset 100 uV
Supplier Device Package SOT-23-5
Voltage - Supply Span (Max) 28 V
Voltage - Supply Span (Min) 1.6 V

Getting Started

To evaluate this part, use the MAX9938 evaluation kit which provides a proven PCB layout to minimize parasitic resistance in the sense path. When designing your board, place the 0.1uF supply bypass capacitor as close as possible to the VCC pin and use Kelvin connections for the RS+ and RS- sense inputs. Select a shunt resistor value that keeps the differential input voltage within the specified linear range for the 100V/V gain variant.

Also Consider

MAX44284HAWT+T ADIAnalog Devices Inc. - An alternative ultra-low power amplifier with high precision and a wide supply range in a tiny 6-bump WLP package.
INA199A1DCKR TITexas Instruments - A cost-effective alternative for general purpose current sensing with a 50V/V gain and similar SOT-23 packaging.