LTC6652AHMS8-1.25#PBF

Overview

The LTC6652AHMS8-1.25#PBF is a precision buffered voltage reference delivering a fixed 1.25V output in an 8-lead MSOP package. It features A-grade accuracy of ±0.05% and a maximum temperature coefficient of 5ppm/°C over the –40°C to 125°C range. The device operates from supply voltages between 2.7V and 13.2V, with a minimum dropout of 300mV. Key electrical parameters include a typical quiescent current of 560µA, shutdown current under 2µA, and low noise of 2.1ppm P-P (0.1Hz to 10Hz). It supports sourcing 5mA and sinking 1mA.

Feature Summary

• High-order curvature compensation ensures predictable temperature characteristics and minimal drift across wide operating ranges.
• Integrated buffer provides excellent load regulation and line rejection without requiring external components for stability.
• Dedicated shutdown pin enables ultra-low power consumption when the reference is inactive.
• Capable of sourcing and sinking current, offering flexibility for various load conditions.

Applications

• Automotive control and monitoring systems
• High-resolution data acquisition systems
• Instrumentation and process control equipment
• Precise regulator circuits

Procurement Notes

Verify the specific suffix #PBF indicates lead-free finish and tube packaging. Confirm the 'A' grade designation matches the required ±0.05% accuracy and 5ppm/°C drift specifications. Ensure the MSOP-8 package dimensions align with PCB layout constraints. Cross-reference the manufacturer's latest datasheet for any updates to absolute maximum ratings or thermal characteristics before finalizing procurement.

Selection Notes

Select this component when high initial accuracy and low temperature drift are critical for system performance. The A-grade specification is suitable for applications demanding tight tolerance bands. Consider the 560µA supply current against power budget requirements. The ability to operate with no external output capacitor simplifies design but requires checking stability graphs if significant capacitive loads are present.

Part Context

This part belongs to the LTC6652 family of precision, low-drift, low-noise buffered references. The family includes variants with different output voltages and grades (A and B). The MSOP package offers a compact surface-mount solution compared to hermetic LS8 options. The device is manufactured by Analog Devices Inc., formerly Linear Technology.

Replacement Considerations

LTC6652BHMS8-1.25#PBF offers similar functionality with B-grade specifications (±0.1% accuracy, 10ppm/°C drift). Verify that the relaxed accuracy and higher drift limits meet the application requirements before substituting.

FAQ

["What is the minimum input-to-output voltage differential required for operation?","The minimum operating voltage is VOUT + 300mV or 2.7V, whichever is higher."]

["Does the LTC6652 require an external output capacitor?","No, the device is stable without an output capacitor. However, a capacitor between 0.1µF and 10µF may be beneficial for specific load conditions."]

["How does the shutdown mode affect the output pin?","Tying the SHDN pin low reduces supply current to less than 2µA. In this state, the output impedance becomes approximately 20kΩ multiplied by the rated output voltage."]