UCC2805DTRG4

Overview

The UCC2805DTRG4 is a current-mode PWM controller manufactured by Texas Instruments, designed for high-performance DC-DC switching applications. It operates within a supply voltage range of 10V to 36V and supports switching frequencies up to 500kHz. The device features an integrated 1A peak current driver capable of directly driving external N-channel power MOSFETs. Key electrical parameters include a maximum duty cycle of 90% and a fixed 5ms soft-start time. It is housed in an 8-SOIC surface-mount package and functions across an extended industrial temperature range of -40°C to 85°C.

Feature Summary

• Integrated high-current gate driver with 1A peak sourcing and sinking capability for direct MOSFET drive
• Fixed frequency operation with adjustable timing resistor interface supporting up to 500kHz
• Built-in 5ms soft-start circuitry limits inrush current during startup sequences
• Comprehensive protection features including undervoltage lockout, overcurrent limiting, and thermal shutdown

Applications

• High-density point-of-load (POL) converters
• Universal input offline flyback power supplies
• Forward converter topologies for telecom and industrial equipment
• Battery charger adapters and wall-wart power bricks

Procurement Notes

Verify the specific ordering suffix 'G4' to confirm lead-free RoHS compliance status as defined by manufacturer specifications. Confirm that the 'D' suffix corresponds to the SOIC-8 package variant rather than other footprint options. Ensure procurement channels provide valid traceability documentation for component authenticity. Cross-reference the full part number against the latest datasheet revision history to account for any design or specification updates prior to final integration.

Selection Notes

Select this component when designing isolated or non-isolated topologies requiring robust current-mode control with high drive strength. The 500kHz maximum frequency allows for reduced passive component size compared to lower-frequency alternatives. Evaluate the 90% duty cycle limit against the required input-to-output voltage ratio for the target topology. Consider the 1A driver capability for minimizing gate charge losses in medium-power applications without requiring additional buffer stages.

Part Context

This part belongs to the UCC280x series of current-mode PWM controllers from Texas Instruments. It shares functional similarities with the UC2805 and UCC2805 families but offers enhanced performance characteristics and modern packaging options. The device complements other controllers in the portfolio such as the UCC28060 for PFC applications, providing a versatile solution for various DC-DC conversion needs within the broader power management ecosystem.

Replacement Considerations

UC2805N

FAQ

What is the maximum operating frequency supported by the UCC2805DTRG4?

The device supports switching frequencies up to 500kHz, determined by the external timing resistor connected to the RT pin.

Does the UCC2805DTRG4 include internal compensation?

No, the UCC2805DTRG4 is a current-mode controller that requires external compensation components to stabilize the feedback loop.