CAT4139TD-GT3.

The CAT4139TD-GT3 is a high current boost white LED Driver with DC/DC step-up converter that delivers an accurate constant current ideal for driving LEDs. Operation at a fixed switching frequency of 1MHz 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. This is ideal for driving parallel strings of up to five white LEDs in series or up to 22V. LED dimming can be done by using a DC voltage, a logic signal or a pulse width modulation (PWM) signal. The shutdown input pin allows the device to be placed in power-down mode with zero quiescent current. In addition to thermal protection and overload current limiting, the device also enters a very low power operating mode during open LED fault conditions.

• Soft start in-rush current limiting
• Open LED over-voltage protection
• Thermal overload protection
• 750mA Switch current limit
• Up to 87% efficiency