LM3409 Buck Controller for High-Power LED Drivers


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, LM3409HVQ1)
• 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

Out of stock

SKU: 1057 Category:

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 regulate an accurate constant current
without the need for external control loop
compensation. 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 complete the feature set


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