The LM3407 device is a constant current output floating buck switching converter designed to provide constant current to high-power LEDs. The device is ideal for automotive, industrial, and general lighting applications. The LM3407 has an integrated power N-channel MOSFET that makes the application solution compact and simple to implement. An external 1% thick-film resistor allows the converter output voltage to adjust as needed to deliver constant current within 10% accuracy to a serially connected LED string of varying number and type. Converter switching frequency is adjustable from 300 kHz to 1 MHz. The LM3407 features a dimming input to enable LED brightness control by Pulse Width Modulation (PWM). Additionally, a separate enable pin allows for low-power shutdown. An exposed pad MSOP-8 package provides excellent heat dissipation and thermal performance. Input UVLO and output open-circuit protection ensure a robust LED driver solution.
| Input voltage type | DC/DC |
| Topology | Buck |
| Vin (min) (V) | 4.5 |
| Vin (max) (V) | 30 |
| Vout (max) (V) | 27 |
| Vout (min) (V) | 0.45 |
| Iout (max) (A) | 0.35 |
| Iq (typ) (mA) | 0.78 |
| 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 |
| HVSSOP (DGN) | 8 | 14.7 mm² 3 x 4.9 |
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