Product Description
75V P-FET buck controller for high power LED drivesDescription:The LM3409, LM3409-Q1, LM3409HV, and LM3409HV-Q1 are P-channel MOSFET (PFET) controllersfor step-down (buck) current regulators.
They offer wide input voltage range, high-sidedifferential current sense with low adjustable threshold voltage and fast output enable/disablefunction 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 currentsup to 5 A are easily achievable.
The LM3409 devices use constant off-time (COFT) control to regulate an accurate constantcurrent without the need for external control loop compensation.
Analog and PWM dimming are easy toimplement 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.
For all available packages, see the orderable addendum at the end of the data sheet.
Features:• 2-?, 1-A Peak MOSFET Gate Drive• VIN Range: 6 V to 42 V (LM3409, LM3409-Q1)• VIN Range: 6 V to 75 V (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• Thermally Enhanced 10-Pin, HVSSOP Package
