PT4119E89E

PT4119 is a continuous inductor current conduction mode buck constant current source for driving one or more series-connected LEDs. The input voltage range is 6V to 30V, with adjustable output current up to 0.8A. Depending on the input voltage and external components, it can drive LEDs up to tens of watts. With an integrated power switch, it uses high-side current sensing to set the average LED current, and accepts both analog dimming and wide-range PWM dimming via the DIM pin. When the DIM voltage drops below 0.3V, the power switch turns off and enters a standby state with extremely low operating current. Available in SOT89-5 and ESOP8 packages.

Applications

• Low-voltage LED spotlights replacing halogen lamps
• Automotive LED lighting
• LED backup lights
• LED signal lights

Key features

• Minimal external components
• Wide input voltage range: 6V to 30V
• Maximum output current of 0.8A
• Multiplexed DIM pin for LED on/off switching, analog dimming, and PWM dimming
• 3% output current accuracy
• Natural protection against LED open circuit
• Up to 97% efficiency
• Adjustable output constant current control
• ESOP8 package with enhanced thermal dissipation for high-power driving