UCC2837N

Overview

The UCC2837N is an 8-pin N-FET linear regulator controller designed for extremely low dropout applications. It integrates a charge pump to drive external N-channel MOSFETs, enabling operation with input voltages as low as 3V and output voltages down to 1.5V. The device features duty ratio mode overcurrent protection, which limits average power dissipation during faults while maintaining peak transient loading capability. Electrical characteristics specify a typical reference voltage of 1.5V, a supply current of 1.5mA at 5V, and a maximum operating temperature of 85°C.

Feature Summary

• Integrates an onboard charge pump to generate gate drive voltage for external N-MOSFET pass transistors
• Supports extremely low dropout linear regulation with input voltages starting from 3V
• Utilizes duty ratio mode overcurrent protection to manage fault conditions and thermal stress

Applications

• Custom processor voltage regulation
• Bus termination voltage generation
• Logic level voltage supplies below 3V

Procurement Notes

Verify the specific suffix 'N' corresponds to the desired package type, typically PDIP-8, against the manufacturer's official documentation. Confirm that the component meets the required industrial or commercial temperature ranges specified in the datasheet. Ensure the ordering information matches the exact part number to avoid discrepancies in pinout or electrical specifications.

Selection Notes

Select this controller when designing linear regulators requiring high efficiency and minimal dropout voltage using external N-channel MOSFETs. Consider the internal charge pump limitations and ensure the external capacitor on the CAP pin provides sufficient holdup time for transient loads. Evaluate the need for external compensation components to stabilize the error amplifier loop based on the selected MOSFET's gate capacitance.

Part Context

The UCC2837 belongs to a family of linear regulator controllers that includes the UCC1837 and UCC3837. These devices share identical functional architectures but differ in their qualified operating temperature ranges. The UCC2837 specifically targets the extended commercial range, bridging the gap between standard consumer and ruggedized industrial requirements.

Replacement Considerations

Direct replacements within the same family include the UCC1837 for military/extended temperature grades and the UCC3837 for standard commercial grades. Verify that any substitute maintains the 8-pin configuration and compatible electrical parameters for the specific application environment.