CAT4139 Description
The CAT4139 is a DC/DC step−up converter that delivers an accurate constant current ideal for driving LEDs. Operation at a fixed switching frequency of 1 MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor R1.
CAT4139 Key Features
- Switch Current Limit 750 mA
- Drives LED Strings up to 22 V
- Up to 87% Efficiency
- Low Quiescent Ground Current 0.6 mA
- 1 MHz Fixed Frequency Low Noise Operation
- Soft Start “In-rush” Current Limiting
- Shutdown Current Less than 1 mA
- Open LED Overvoltage Protection
- Automatic Shutdown at 1.9 V (UVLO)
- Thermal Overload Protection