Key facts
- Brand
- Catalyst
- Model
- CAT4238
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-04
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Catalyst CAT4238 High Efficiency 10-LED Boost Converter Datasheet
The CAT4238 is a fixed‑frequency (1 MHz) boost converter designed for driving up to ten high‑efficiency LEDs. It provides a constant current output with up to 87 % efficiency and a low quiescent ground current of 0.6 mA, making it suitable for battery‑powered applications such as portable media players and handheld devices.
The device includes multiple protection mechanisms: UVLO shuts down at 1.9 V, over‑voltage protection limits the output to 40 V, and thermal shutdown activates above 150 °C. LED current is set by an external resistor (R1) using the formula I_LED = 0.3 V / R1, and the part is offered in a thin SOT‑23‑5 package for space‑critical designs.
Catalyst CAT4238 specifications
| Efficiency | Up to 87 % |
|---|---|
| Output Voltage (LED string) | Up to 38 V |
| Quiescent Current | 0.6 mA |
| Switching Frequency | 1 MHz |
| Maximum LED Current | 40 mA |
| UVLO Threshold | 1.9 V |
Source: Catalyst CAT4238 High Efficiency 10-LED Boost Converter Datasheet
All Catalyst CAT4238 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
How is the LED current set on the CAT4238?
LED current is set by an external resistor R1 using the formula I_LED = 0.3 V / R1.
From: Catalyst CAT4238 High Efficiency 10-LED Boost Converter Datasheet
What is the switching frequency of the CAT4238?
The device operates at a fixed switching frequency of 1 MHz.
From: Catalyst CAT4238 High Efficiency 10 LED Boost Converter Datasheet
How is the LED current set in the CAT4238?
LED current is set by the external resistor R1 using the formula I_LED = 0.3 V / R1.
From: Catalyst CAT4238 High Efficiency 10 LED Boost Converter Datasheet