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LM3409 PDF Datasheet

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Description

This is PFET Buck Controller. LM3409 , LM3409HV PFET Buck Controller for High Power LED Drives LM3409 LM3409HV June 12, 2009 PFET Buck Controller for High Power LED Drives General Description The LM3409, 09HV are P-channel MosFET (PFET) controllers for step-down (buck) current regulators. They offer wide input voltage range, high-side differential current sense with low adjustable threshold voltage, fast output enable, disable function and a thermally enhanced eMSOP-10 package. These features combine to make the LM3409, 09HV ideal for use as constant current sources for driving LEDs where forward currents up to 5A are easily achievable. The LM3409, 09HV uses Constant Off-Time (COFT) control to regulate an accurate constant current without the need for external control loop compensation. Analog and PWM dimming are easy to implement and result in a highly linear dimming range with excellent achievable contrast ratios. Programmable UVLO, low-power shutdown, and thermal shutdown complete the feature.