LM3406

LM3406, LM3406HV, LM3406HV-Q1 SNVS512E – SEPTEMBER 2008 – REVISED MARCH 2014 LM3406 1.5-A, Constant Current, Buck Regulator for Driving High Power LEDs 1 FEATURES 1 LM3406HV-Q1 – Automotive Grade Device – AEC-Q100 Grade 1 Qualified – Operating Ambient Temperature: –40°C to 125°C Integrated 2.0A MOSFET VIN Range 6V to 42V (LM3406) VIN Range 6V to 75V (LM3406HV) VIN Range 6V to 75V (LM3406HV-Q1) 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 TSSOP-14 Package 3 DESCRIPTION The LM3406 family 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 rou...