LM3406HV

LM3406/06HV 1.5A Constant Current Buck Regulator for Driving High Power LEDs LM3406/06HV February 8, 2010 1.5A Constant Current Buck Regulator for Driving High Power LEDs General Description The LM3406/06HV are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, they contain a high-side N-channel MOSFET switch with a current limit of 2.0A (typical) for step-down (Buck) regulators. Controlled on-time with true average current and an external current sense resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series-parallel connected LED arrays of varying number and type. LED dimming via pulse width modulation (PWM) is achieved using a dedicated logic pin or by PWM of the power input voltage. The product feature set is rounded out with lowpower shutdown and thermal shutdown protection. Features ■ Integrated 2.0A MOSFET ■ VIN Range 6V to 42V (LM3406) ■ VIN Range 6V to 75V (LM3406HV) ■ True average output current control ■ 1.7A Minimum Output Current Limit Over Temperature ■ Cycle-by-Cycle Current Limit ■ PWM Dimming with Dedicated Logic Input ■ PWM Dimming with Power Input Voltage ■ Simple Control Loop Compensation ■ Low Power Shutdown ■ Supports All-Ceramic Output Capacitors and Capacitor- less Outputs ■ Thermal Shutdown Protection ■ eTSSOP-14 Package Applications ■ LED Driver ■ Constant Current Source ■ Automoti...