GENERAL DESCRIPTION The PT4211 is a continuous conduction mode inductive step-down converter, designed for driving single or multiple

 series connected LEDs from a voltage source higher than the LED voltage. The device operates from an input supply between 5V and 30V and

 provides an externally adjustable output current of up to 350mA. The PT4211 includes the output switch and a high-side output current sensing

 circuit, which uses an external resistor to set the nominal average output current, and a dedicated DIM input accepts a wide range of

 pulsed dimming. Applying a voltage of 0.4V or lower to the DIM pin turns the output off and switches the device into a low current standby

 state. Built-in Soft Over Temperature Protection protects the device from over temperature damage. The PT4211 is available in SOT23-5 

package. FEATURES 

? Simple low parts count 

? Wide input voltage range: 5V to 30V 

? Up to 350mA output current 

? PWM dimming 

? 3% output current accuracy. 

? Up to 1MHz switching frequency 

? Typical 3% output current accuracy 

? Inherent open-circuit LED protection 

? High efficiency (up to 93%) 

? Adjustable Constant LED Current 

? High-Side Current Sense 

? Hysteretic Control: No Compensation 

? Soft Over Temperature Protection 

APPLICATION

 ? Low voltage halogen replacement LEDs 

? Automotive lighting 

? LED back-up lighting 

? Illuminated signs 

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