LTC2991IMS#PBF

Thermal Management Overview

The LTC2991IMS#PBF is an octal I2C voltage, current, and temperature monitor from Analog Devices Inc. It operates on a 2.9V to 5.5V supply within the -40°C to 85°C industrial range. The device features eight inputs (V1-V8) for single-ended or differential measurements of voltages and currents, plus four remote diode temperature channels. It includes an internal temperature sensor with ±3.5°C total unadjusted error and an internal 10ppm/°C voltage reference. Communication occurs via a standard I2C interface supporting up to 400kHz clock frequency.

Thermal Management Feature Summary

• Monitors system temperatures, voltages, and currents through an I2C serial interface
• Supports differential measurements for current sense resistors or temperature sensing transistors
• Includes selectable addresses and configurable functionality for flexible system integration
• Features high ESD protection ratings on input pins

Thermal Management Applications

• Temperature measurement
• Supply voltage monitoring
• Current measurement
• Remote data acquisition
• Environmental monitoring

Thermal Management Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the IMS designation corresponds to the industrial temperature grade (-40°C to 85°C). Ensure the ordering information matches the required package type, which is a 16-lead plastic MSOP. Cross-reference the manufacturer part number with authorized distributors to ensure authenticity and availability status.

Thermal Management Selection Notes

Select this component when an application requires simultaneous monitoring of multiple voltage rails, current levels, and temperatures using a single I2C interface. It is suitable for systems needing submillivolt voltage resolution, 1% current measurement accuracy, and 1°C temperature accuracy. Consider the 14-bit ADC resolution and the ability to pair inputs for differential sensing when designing the signal conditioning stage.

Thermal Management Part Context

The LTC2991 belongs to the family of supervisory circuits and power management ICs manufactured by Analog Devices Inc. It is designed to minimize supporting components through its internal reference and integrated ADC. The device fits into systems requiring precise environmental and electrical parameter tracking, offering flexibility through configurable measurement modes and address selection.

Thermal Management Replacement Considerations

Consult Linear Technology marketing for parts specified with wider operating temperature ranges beyond the industrial grade.

Thermal Management FAQ

How does the LTC2991 handle series resistance in remote diode temperature measurements?

The device uses proprietary techniques to cancel errors due to series resistance during remote diode measurements, allowing accurate temperature readings without external compensation components.

What is the maximum SCL clock frequency supported by the I2C interface?

The LTC2991 supports a maximum SCL clock frequency of 400 kHz in fast mode, as well as 100 kbit/s in standard mode.