LTC2991CMS#PBF

Thermal Management Overview

The LTC2991CMS#PBF is an octal I2C voltage, current, and temperature monitor in a 16-lead MSOP package. It features eight selectable inputs (V1–V8) for single-ended or differential measurements of supply voltages, current sense resistors, or remote diode temperatures. The device includes an internal 10ppm/°C reference and measures internal temperature and VCC. It operates on a 3V to 5.5V supply with a 14-bit ADC resolution. Key specifications include ±0.7°C typical accuracy for remote diodes, ±1°C for the internal sensor, and support for series resistance cancellation.

Thermal Management Feature Summary

• Configurable monitoring of up to four remote diode temperatures using NPN transistors or embedded sensors with series resistance cancellation.
• High-resolution 14-bit analog-to-digital conversion for precise voltage and current sensing across eight input channels.
• Integrated PWM output providing a duty cycle proportional to remote diode temperature for direct fan control.
• Selectable I2C addressing allowing multiple devices on a single bus with configurable measurement modes.

Thermal Management Applications

• Measuring voltage, current, and temperature in system environments
• Monitoring four remote diode temperatures
• Environmental monitoring and data acquisition

Thermal Management Procurement Notes

Verify the specific suffix CMS indicates the commercial temperature range (0°C to 70°C). Confirm the #PBF designation ensures lead-free compliance. Check for availability as distribution status may vary. Ensure the host system supports the required I2C interface timing and voltage levels compatible with the 3V to 5.5V operating range.

Thermal Management Selection Notes

Select this component when high accuracy is required for multiple simultaneous measurements. It is suitable for applications needing submillivolt voltage resolution and 1% current measurement accuracy. Consider the 16-lead MSOP package size for space-constrained designs. Ensure the application can accommodate the necessary external components for decoupling and pull-up resistors if not integrated elsewhere.

Thermal Management Part Context

This part belongs to the LTC2991 family of multi-sensor monitors. It provides a consolidated solution for thermal and power management by integrating voltage, current, and temperature sensing into a single IC. The family utilizes an I2C interface for digital communication, reducing board complexity compared to discrete sensor solutions.

Thermal Management Replacement Considerations

LTC2991IMS#PBF offers the same functionality with an extended industrial temperature range (-40°C to 85°C).