LTC1541CDD#PBF

Overview

The LTC1541CDD#PBF is a micropower operational amplifier, comparator, and bandgap reference integrated in an 8-lead plastic DFN package measuring 3mm x 3mm. It operates from a single supply voltage range of 2.5V to 12.6V or dual supplies of ±1.25V to ±6.3V with a typical supply current of 5µA. The op amp features rail-to-rail output swing, unity-gain stability, and a gain-bandwidth product of 12kHz. The comparator includes internal hysteresis of ±2.25mV and has its inverting input internally connected to the 1.2V reference output.

Feature Summary

• Integrates a micropower op amp, comparator, and 1.2V reference in a compact 3mm x 3mm DFN package
• Op amp provides rail-to-rail output swing and maintains stability driving capacitive loads up to 1000pF
• Comparator features internal hysteresis for clean switching on slow-moving signals
• Reference output can source up to 2mA and drive bypass capacitors without oscillation

Applications

• Battery-powered systems
• Solar-powered systems
• Automotive keyless entry
• Low frequency local area alarms and detectors
• Infrared receivers for remote controls

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing this component. Confirm that the DD package designation corresponds to the 8-lead 3mm x 3mm DFN form factor required for your PCB layout constraints. Ensure the commercial grade temperature specifications align with your intended operating environment before finalizing procurement.

Selection Notes

Select the LTC1541CDD#PBF when space is limited due to its small DFN footprint. Choose this part if the application requires a unified solution combining amplification, comparison, and a stable reference voltage. Consider the low quiescent current for battery longevity and the rail-to-rail capabilities for maximizing dynamic range in low-voltage single-supply designs.

Part Context

This component belongs to the LTC1541/LTC1542 family of micropower mixed-signal ICs. While the LTC1542 separates the comparator inputs, the LTC1541 variant uniquely integrates the reference output directly to the comparator's inverting input. This integration simplifies circuit design for threshold detection applications by eliminating external resistor networks typically needed for setting trip points.

Replacement Considerations

The datasheet identifies the MAX951 and MAX953 as pin-compatible upgrades for this device family.