The LM3404 and LM3404HV devices are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, these devices contain a high-side N-channel MOSFET switch with a current limit of 1.5-A (typical) for step-down (Buck) regulators. Hysteretic controlled on-time and an external 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. Some features are: LED dimming using pulse width modulation (PWM), broken or open LED protection, low-power shutdown, and thermal shutdown.
| 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 |
| Iq (typ) (mA) | 0.625 |
| Features | Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Thermal shutdown |
| Operating temperature range (°C) | -40 to 125 |
| Dimming method | PWM |
| Number of channels | 1 |
| Rating | Catalog |
| HSOIC (DDA) | 8 | 29.4 mm² 4.9 x 6 |
| SOIC (D) | 8 | 29.4 mm² 4.9 x 6 |
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