LTC1840IGN#PBF

Overview

The LTC1840IGN#PBF is a dual fan controller manufactured by Analog Devices Inc., housed in an SSOP-28 package. It features a two-wire serial interface for configuration and control. The device supports PWM-based fan speed regulation, typically operating at frequencies such as 25 kHz or 50 kHz depending on configuration. It integrates temperature monitoring capabilities, allowing for automatic thermal management of connected components. The controller provides diagnostic outputs to indicate fault conditions or operational status.

Feature Summary

• Dual-channel PWM fan speed control with software-selectable frequencies
• Integrated two-wire serial interface for register configuration
• On-chip temperature sensing for thermal protection loops
• Diagnostic output pins for fault indication and system monitoring

Applications

• Server and workstation cooling systems
• Industrial equipment thermal management
• Telecommunications infrastructure cooling
• Network switch and router fan control

Procurement Notes

Verify the specific suffix and tape/reel versus tube packaging options available from authorized distributors. Confirm RoHS compliance status and lead times directly with Analog Devices or certified partners. Ensure the part number matches the exact pinout and voltage requirements for your design. Check for any recent product lifecycle notices regarding obsolescence or replacement recommendations.

Selection Notes

Select this component when dual independent fan control with integrated temperature sensing is required. Compare against single-channel controllers if only one fan needs regulation. Consider the SSOP-28 package size constraints relative to PCB layout. Verify that the two-wire interface compatibility matches the host microcontroller or processor used in the system design.

Part Context

The LTC1840 belongs to Linear Technology's (now Analog Devices) family of thermal management ICs. It is designed specifically for applications requiring precise fan speed control based on temperature feedback. Similar parts in the series may offer different channel counts or interface types. The #PBF suffix indicates lead-free construction compliant with environmental directives.

Replacement Considerations

Check Analog Devices documentation for direct replacements within the LTC184x series. Evaluate alternative dual fan controllers from other manufacturers if supply is limited. Ensure pin-to-pin compatibility and register-level software compatibility before substituting.