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
For all available packages, see the orderable
addendum at the end of the data sheet.
View datasheet View product folder