LM3409-Q1

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design LM3409, LM3409-Q1, LM3409HV, LM3409HV-Q1 SNVS602L – MARCH 2009 – REVISED JUNE 2016 LM3409, -Q1, LM3409HV, -Q1 P-FET Buck Controller for High-Power LED Drivers 1 Features 1 LM3409-Q1 and LM3409HV-Q1 are Automotive Grade Products: AEC-Q100 Grade 1 Qualified 2-Ω, 1-A Peak MOSFET Gate Drive VIN Range: 6 V to 42 V (LM3409, LM3409-Q1) VIN Range: 6 V to 75 V (LM3409HV, LM3409HV- Q1) 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 Capacitor-less Outputs Low-Power Shutdown and Thermal Shutdown Thermally Enhanced 10-Pin, HVSSOP Package 2 Applications LED Driver Constant Current Source Automotive Lighting General Illumination 3 Description The LM3409, LM3409-Q1, LM3409HV, and LM3409HV-Q1 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 and fast output enable/disable function and a thermally enhanced 10-pin, HVSSOP package. These features combine to make the LM3409 family of devices ideal for use as constant current sources for driving LEDs where forward currents up to 5 A are easily achievable. The LM3409 devices use constant off-time (COFT) control to reg...