The LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478 can be adjusted to any value between 100 kHz and 1 MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.
The LM3478 has built-in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. Power saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.
| Topology | Boost, Flyback, Forward, SEPIC |
| Vin (min) (V) | 2.97 |
| Vin (max) (V) | 40 |
| Vout (min) (V) | 1.26 |
| Vout (max) (V) | 500 |
| Regulated outputs (#) | 1 |
| Switching frequency (min) (kHz) | 100 |
| Switching frequency (max) (kHz) | 1000 |
| Iq (typ) (mA) | 2.7 |
| Features | Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Nonsynchronous rectification, Pre-Bias Start-Up |
| Duty cycle (max) (%) | 100 |
| Rating | Catalog |
| Operating temperature range (°C) | -40 to 125 |
| Type | Controller |
| SOIC (D) | 8 | 29.4 mm² 4.9 x 6 |
| VSSOP (DGK) | 8 | 14.7 mm² 3 x 4.9 |
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