The LM3414 and LM3414HV are 1-A 60-W(1) common anode-capable constant current buck LED drivers. They are suitable for driving single string of 3-W HBLED with up to 96% efficiency. They accept input voltages from 4.5 VDC to 65 VDC and deliver up to 1-A average LED current with ±3% accuracy. The integrated low-side N-channel power MOSFET and current sensing element realize simple and low component count circuitry, as no bootstrapping capacitor and external current-sensing resistor are required. An external small-signal resistor to ground provides very fine LED current adjustment, analog dimming, and thermal fold-back functions.
Constant switching frequency operation eases EMI. No external loop compensation network is needed. The proprietary Pulse-Level-Modulation (PLM) control method benefits in high conversion efficiency and true average LED current regulation. Fast response time realizes fine LED current pulse fulfilling the 240 Hz 256-step dimming resolution requirement for general lighting.
The LM3414 and LM3414HV are available in SOIC-8 and 3 mm × 3 mm WSON-8 packages.
| Input voltage type | DC/DC |
| Topology | Buck |
| Vin (min) (V) | 4.5 |
| Vin (max) (V) | 42 |
| Vout (max) (V) | 42 |
| Vout (min) (V) | 0.2 |
| Iout (max) (A) | 1 |
| Iq (typ) (mA) | 3.2 |
| Features | Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Thermal shutdown |
| Operating temperature range (°C) | -40 to 125 |
| Dimming method | Analog, PWM |
| Number of channels | 1 |
| Rating | Catalog |
| HSOIC (DDA) | 8 | 29.4 mm² 4.9 x 6 |
| WSON (NGQ) | 8 | 9 mm² 3 x 3 |
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