The LM3406 family are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, they contain a high-side N-channel MOSFET switch with a current limit of 2.0A (typical) for step-down (Buck) regulators. Controlled on-time with true average current and an external current sense resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series-parallel connected LED arrays of varying number and type. LED dimming via pulse width modulation (PWM) is achieved using a dedicated logic pin or by PWM of the power input voltage. The product feature set is rounded out with low-power shutdown and thermal shutdown protection.
| Input voltage type | DC/DC |
| Topology | Buck |
| Vin (min) (V) | 6 |
| Vin (max) (V) | 42 |
| Vout (max) (V) | 40 |
| Vout (min) (V) | 0.2 |
| Iout (max) (A) | 1.5 |
| Iq (typ) (mA) | 1.2 |
| Features | Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Precision Dimming Control, Thermal shutdown |
| Operating temperature range (°C) | -40 to 125 |
| Dimming method | 2-Wire, PWM |
| Number of channels | 1 |
| Rating | Catalog |
| HTSSOP (PWP) | 14 | 32 mm² 5 x 6.4 |
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