LM3409HV Datasheet | National Semiconductor

Description The LM3409/09HV are P-channel Mos FET (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 e MSOP-10 package. These features bine 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 pensation. 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 plete the feature set. Features - - - - - - - - - 2Ω, 1A Peak Mos FET Gate Drive VIN Range: 6V to 42V (LM3409) VIN Range: 6V to 75V (LM3409HV) Differential, High-side Current Sense Cycle-by-Cycle Current Limit No Control Loop pensation Required 10,000:1 PWM Dimming Range 250:1 Analog Dimming Range Supports All-Ceramic Output Capacitors and Capacitorless Outputs - Low Power Shutdown - Thermal Shutdown Protection - Thermally Enhanced e MSOP-10 Package Applications - - - - - LED Driver Constant Current Source Automotive Lighting General Illumination Industrial Lighting Typical Application © 2009 National Semiconductor Corporation .national. LM3409/LM3409HV .. Connection Diagram LM3409/09HV 10-Lead Exposed Pad e MSOP Package Ordering Information Order Number LM3409MY LM3409MYX LM3409HVMY LM3409HVMYX NSC Package Drawing MUC10A MUC10A MUC10A MUC10A Top Marking SXFB SXFB SYHB SYHB Supplied As 1000 Units on tape and reel 3500 Units on tape and reel 1000 Units on tape and reel 3500 Units on tape and reel Pin Descriptions Pin(s) 1 2 3 4 5 6 7 8 9 10 DAP Name UVLO IADJ EN COFF GND PGATE CSN CSP VCC VIN DAP Description Input under-voltage lockout Analog LED...