CAT4109V-GT2

Overview

The CAT4109V-GT2 is a three-channel constant-current LED driver IC from onsemi, designed for RGB LED applications without requiring an inductor. It operates within a supply voltage range of 3 V to 5.5 V and features independent current programming via external resistors for each channel. The device supports PWM dimming through dedicated inputs (PWM1, PWM2, PWM3) and includes an output enable (OE) pin for global control. Each channel delivers up to 175 mA with a low dropout voltage of 0.4 V at full load, enabling efficient power design across wide voltage ranges. The LEDs can withstand voltages up to 25 V, suitable for long series configurations. Packaged in a 16-pin SOIC, it functions between -40°C and +85°C.

Feature Summary

• Three independent constant-current sinks allow precise programming of individual LED currents via external resistors.
• Integrated PWM dimming capability with separate control inputs for each channel ensures accurate color mixing.
• Low dropout voltage operation enhances power efficiency and reduces thermal dissipation during high-current loads.
• Built-in thermal shutdown protection automatically disables outputs when junction temperature exceeds safe limits.

Applications

• Architectural and landscape lighting requiring dynamic RGB color effects
• LED signage and display panels needing uniform current distribution
• LCD backlight systems demanding consistent brightness and color stability

Procurement Notes

Verify the specific suffix GT2 corresponds to the standard operating temperature range (-40°C to +85°C) and SOIC-16 packaging configuration. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure input voltage does not exceed 5.5 V to maintain reliable operation within specified electrical limits.

Selection Notes

Select this component for designs requiring inductor-less RGB driving with independent channel control. It is suitable for applications where space constraints prohibit magnetic components. Consider the 25 V LED pin rating for series string lengths. Evaluate thermal management requirements given the 175 mA per channel capability and SOIC package thermal characteristics.

Part Context

This part belongs to the CAT4109 family of LED drivers, which are optimized for multi-color LED applications. The CAV4109 variant offers an extended automotive temperature range. Both share identical electrical specifications and pinouts, differing primarily in qualification standards and operational temperature limits defined by the manufacturer.

Replacement Considerations

The CAT4103V-GT2 is a related model with similar electrical parameters but utilizes a 4-wire interface instead of PWM. Verify interface compatibility before substitution. No other direct substitutes are confirmed in public documentation.

FAQ

How is the LED current programmed for each channel?

The current for each of the three channels is independently set using external resistors connected to the respective reset pins.

What is the maximum voltage allowed on the LED output pins?

Each LED output pin can withstand a maximum voltage of 25 V, allowing for flexible series configurations.