LM3409Q

LM3409 / LM3409HV / LM3409Q / LM3409QHV PFET Buck Controller for High Power LED Drives LM3409 / LM3409HV LM3409Q / LM3409QHV 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 LM3409/09Q/09HV/09QHV 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 set. April 12, 2010 Features ■ LM3409Q/LM3409QHV is an Automotive Grade product that is AEC-Q100 grade 1 qualified 2Ω, 1A Peak MosFET Gate Drive VIN Range: 6V to 42V (LM3409/LM3409Q) VIN Range: 6V to 75V (LM3409HV/LM3409QHV) Differential, High-side Current Sense Cycle-by-Cycle Current Limit No Control Loop Compensation Required 10,000:1 PWM Dimming Range 250:1 Analog Dimming Range Supports All-Ceramic Output Capacitors and Capacitorless Outputs ■ Low Power Shutdown ■ Thermal ...