The LM3478Q-Q1 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 LM3478Q-Q1 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478Q-Q1 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 LM3478Q-Q1 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.
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| Part number | Order | Vin (Min) (V) | Vin (Max) (V) | Vout (Min) (V) | Vout (Max) (V) | Regulated outputs (#) | Switching frequency (Min) (kHz) | Switching frequency (Max) (kHz) | Iq (Typ) (mA) | Features | Duty cycle (Max) (%) | Operating temperature range (C) | Rating | Type | Package Group |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM3478Q-Q1 |
|
2.97 | 40 | 1.26 | 500 | 1 | 100 | 1000 | 2.7 |
Adjustable Current Limit
Enable Frequency Synchronization Light Load Efficiency Pre-Bias Start-Up |
100 | -40 to 125 | Automotive | Controller | VSSOP | 8 |
