SMBus Dual/Quad Current Monitor

Accurate Current Measurement with Automatic Overcurrent Shutdown for Four Supply Rails

Description

The MAX34408 and MAX34409 are two- and four-channel current monitors that are configured and monitored with a standard I2C/SMBus serial interface. Each unidirectional current sensor offers precision high-side operation with a low full-scale sense voltage. The devices automatically sequence through two or four channels and collect the current-sense samples and average them to reduce the effect of impulse noise. The raw ADC samples are compared to user-programmable digital thresholds to indicate overcurrent conditions. Overcurrent conditions trigger a hardware output to provide an immediate indication to shut down any necessary external circuitry.

Key Features

Two/Four-Channel Current Monitors
Wide 2.5V to 13.2V Common-Mode Range
Low 12.25mV Full-Scale Current-Sense Voltage
Automatic Round Robin Sequencing to Sample Each Current-Sense Input
Selectable Averaging to Improve Current-Sense Accuracy
Programmable Digital Overcurrent Thresholds with Delay Function
I2C/SMBus Interface with Bus Timeout
Register Access to Real-Time Current Measurements
Shutdown Output Provides Immediate Hardware Indication of Overcurrent
Low Power Consumption
-40°C to +85°C Temperature Range
Small 16-Pin (4mm x 4mm) TQFN Package