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.| Topology | Buck |
| Vin (min) (V) | 6 |
| Vin (max) (V) | 75 |
| Vout (max) (V) | 75 |
| Vout (min) (V) | 1.24 |
| Iout (max) (A) | 5 |
| Iq (typ) (mA) | 2 |
| Operating temperature range (°C) | -40 to 125 |
| Dimming method | Analog, PWM |
| Number of channels | 1 |
| Rating | Catalog |
| HVSSOP (DGQ) | 10 | 14.7 mm² 3 x 4.9 |
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