onsemi

CAT4240TD-GT3

CAT4240TD-GT3 Description

The CAT4240TD-GT3 from onsemi is a high-performance DC-DC regulator designed for driving LEDs with precision and efficiency. This surface-mount IC integrates an internal switch and operates within a 2.8V to 5.5V input range, delivering a regulated 38V output at up to 750mA switch current. With a 1MHz switching frequency, it ensures compact designs while minimizing external component count. The device supports analog and PWM dimming, making it versatile for brightness control. Packaged in a TSOT-23-5 reel for automated assembly, it is ideal for space-constrained applications. Though marked obsolete, it remains a reliable choice for legacy designs requiring high-voltage LED driving.

CAT4240TD-GT3 Features

• Integrated Switch: Eliminates the need for an external MOSFET, reducing BOM cost and PCB footprint.
• Wide Input Range (2.8V–5.5V): Compatible with low-voltage sources like Li-ion batteries or 3.3V/5V rails.
• High Output Voltage (38V): Supports driving multiple series-connected LEDs.
• 1MHz Frequency: Enables smaller inductors and capacitors for compact layouts.
• Dual Dimming Modes: Analog and PWM control for flexible brightness adjustment.
• MSL 1 (Unlimited): Suitable for extended storage without moisture sensitivity concerns.
• REACH Unaffected: Compliant with environmental regulations.

CAT4240TD-GT3 Applications

• Portable Electronics: Backlighting for displays in smartphones, tablets, and handheld devices.
• Automotive Lighting: Interior/accent lighting due to high-voltage capability and dimming support.
• Industrial Indicators: Status LEDs in control panels or instrumentation.
• Consumer Gadgets: Decorative or functional lighting in wearables and IoT devices.
• Legacy Systems: Cost-effective upgrades for older designs requiring efficient LED drivers.

Conclusion of CAT4240TD-GT3

The CAT4240TD-GT3 stands out for its high integration, compact form factor, and flexible dimming, making it a robust solution for LED driving in voltage-constrained environments. While obsolete, its high efficiency (1MHz operation) and 38V output ensure relevance in niche applications. Engineers valuing simplicity and performance in legacy or space-sensitive designs will find this IC a pragmatic choice. For new projects, verifying alternative active models from onsemi's portfolio is recommended.