DESCRIPTION

· The LM3409, LM3409-Q1, LM3409HV, and LM3409HV-Q1 are P-channel MOSFET (PFET) controllers for step-down (buck) current regulators.

· They offer a wide input voltage range, high-side differential current sense, and a thermally enhanced 10-pin HVSSOP package.

· These devices are ideal for constant current sources driving LEDs with forward currents up to 5A.

· They use constant off-time (COFT) control for accurate current regulation without external control loop compensation.

· Features include programmable UVLO, low-power shutdown, and thermal shutdown.

FEATURES

· Automotive Grade Products: AEC-Q100 Grade 1 Qualified.

· 2-Ω, 1-A Peak MOSFET Gate Drive.

· VIN Range: 6V to 42V (LM3409, LM3409-Q1); 6V to 75V (LM3409HV, LM3409HV-Q1).

· 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.

APPLICATIONS

· LED Driver.

· Constant Current Source.

· Automotive Lighting.

· General Illumination.