LTC1444CDHD#PBF

Overview

The LTC1444CDHD#PBF is an ultralow power quad comparator with a built-in reference, housed in a 16-lead (5mm × 4mm) plastic DFN package. It operates from a single 2V to 11V supply or dual ±1V to ±5.5V supply. The device features less than 8.5µA supply current, a 1.221V ±1% internal reference, and programmable hysteresis via the HYST pin. Outputs are open-drain, TTL/CMOS compatible, capable of sinking up to 5mA. Propagation delay is typically 12µs at 10mV overdrive.

Feature Summary

• Ultralow quiescent current consumption for battery-powered applications
• Built-in voltage reference output capable of driving bypass capacitors
• Programmable hysteresis using external resistors connected to the HYST pin
• Open-drain outputs that eliminate crowbar switching currents during state transitions

Applications

• Battery-powered system monitoring
• Threshold detectors
• Window comparators
• Oscillator circuits

Procurement Notes

Verify the specific suffix CDHD corresponds to the commercial temperature range (0°C to 70°C) and DFN package configuration. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure design accounts for the exposed pad connection to V– for thermal management if required by the application layout.

Selection Notes

Select this component when low power consumption is critical alongside the need for multiple comparator channels. The LTC1444 is distinct from the LTC1443 due to its open-drain output structure and lack of separate ground pin for the output stage. Verify that the open-drain requirement aligns with the pull-up resistor strategy in the target circuit design.

Part Context

This part belongs to the LTC1443/LTC1444/LTC1445 family of micropower comparators. While sharing similar core specifications like supply current and input characteristics, the LTC1444 differentiates itself with open-drain outputs and programmable hysteresis capabilities not present in the LTC1443 variant.

Replacement Considerations

LTC1443CDHD#PBF offers pin compatibility but differs in output type (push-pull vs. open-drain) and lacks programmable hysteresis. Substitution requires verifying that the circuit can tolerate the push-pull output structure and does not rely on the specific hysteresis control mechanism.