CAT4139TD-GT3

Overview

The CAT4139TD-GT3 is a high-current boost white LED driver IC manufactured by onsemi. It operates with an input voltage range of 2 V to 5.5 V and delivers a regulated output current of 750 mA. The device utilizes a boost topology with a fixed switching frequency of 1 MHz, supporting a maximum output voltage of 22 V. It features analog and PWM dimming capabilities along with soft-start functionality. Packaged in a TSOT-23-5 surface-mount case, it functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates an internal power switch for compact design
• Supports both analog and pulse-width modulation dimming
• Includes soft-start circuitry to limit inrush current

Applications

• LED backlighting systems
• White LED lighting drivers

Procurement Notes

Verify component authenticity through authorized channels due to end-of-life status. Confirm RoHS compliance and material declarations via official documentation. Check for recent production change notices regarding package or performance updates before finalizing procurement plans.

Selection Notes

Select this component for single-channel high-current applications requiring a boost converter. Ensure the design accommodates the 750 mA output capability and 22 V voltage limit. Verify that the TSOT-23-5 package fits the available board space and thermal requirements.

Part Context

This part belongs to the CAT4139 series of DC/DC step-up converters designed specifically for driving white LEDs. It represents a solution from onsemi's portfolio for efficient LED illumination control using a compact form factor.

Replacement Considerations

The manufacturer has declared this product obsolete. Review official replacement recommendations from onsemi or identify equivalent parts with matching electrical specifications and pinout compatibility.