UCC2837NG4

Overview

The UCC2837NG4 is an 8-pin N-FET linear regulator controller designed for extremely low dropout applications. It operates with input voltages as low as 3V and provides a 1.5V internal reference. The device features an on-board charge pump to drive external N-MOSFETs, enabling high current levels and efficient regulation for custom processor voltages below 3V. It includes duty ratio mode overcurrent protection and a transconductance error amplifier. The component supports output voltages as low as 1.5V with low external parts count requirements.

Feature Summary

• Integrates an on-board charge pump to generate gate drive voltage for external N-channel MOSFET pass transistors.
• Utilizes duty ratio mode overcurrent protection to limit average power dissipation during fault conditions while maintaining peak transient loading capability.
• Features a built-in 1.5V reference and transconductance error amplifier for precise output voltage regulation.
• Supports operation from input supply voltages starting at 3V with extremely low dropout characteristics.

Applications

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

Procurement Notes

Verify the specific suffix 'NG4' against Texas Instruments documentation to confirm it denotes a lead-free, RoHS-compliant variant within the UCC2837 family. Ensure the operating temperature range aligns with the -25°C to 85°C specification defined for the UCC2837 model in the datasheet. Confirm package type compatibility with SOIC-8 or DIP-8 layouts as required by your design constraints.

Selection Notes

Select this controller when designing linear regulators requiring input voltages near 3V and output voltages below standard 3-terminal regulator ranges. The integrated charge pump eliminates the need for external gate drivers for N-MOSFETs. Designers must account for the charge pump impedance and select appropriate timing capacitors to manage startup times and fault recovery durations effectively.

Part Context

The UCC2837 belongs to the UCC1837/2837/3837 family of linear regulator controllers manufactured by Texas Instruments (formerly Unitrode). These devices are optimized for low dropout performance using external N-channel MOSFETs. The UCC2837 specifically covers the commercial temperature range, distinguishing it from the industrial UCC1837 and extended UCC3837 variants.

Replacement Considerations

Public confirmed substitutes include UCC1837 and UCC3837. Verify that the replacement part's temperature range and electrical characteristics match the original design requirements before integration.