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)
• V IN 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

2 APPLICATIONS
• LED Driver
• Constant Current Source
• Automotive Lighting
• General Illumination
• Industrial Lighting

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
rounded out with low-power shutdown and thermal
shutdown protection.
The LM3406HV-Q1 is AEC-Q100 grade 1 qualified.