The LM3478 is a high efficiency, low side N-channel switching regulator controller from TI. It is suitable for use in topologies requiring low side FET, such as boost, flyback, SEPIC, etc. The device operates at extremely high switching frequency, and has built in features such as thermal shutdown, short-circuit protection, over voltage protection, etc.
The LM3478 is a high-efficiency low-side N-channel MOSFET switching regulator controller designed for use in topologies requiring a low-side FET, such as boost, flyback, and SEPIC converters. It features current mode control providing superior bandwidth and transient response, along with cycle-by-cycle current limiting.
The device includes built-in protection features such as thermal shutdown, short-circuit protection, over-voltage protection, and an undervoltage lockout with hysteresis. A power-saving shutdown mode reduces supply current to 5uA, allowing for power supply sequencing, while internal soft-start limits inrush current at startup.
| Supply Voltage Range | 2.95V to 40V |
|---|---|
| Adjustable Clock Frequency | 100kHz to 1MHz |
| Internal Reference Accuracy | +/-2.5% (over temperature) |
| Shutdown Current | 10uA (over temperature) |
| Package Type | 8-lead Mini-SO8 (MSOP-8) |
| Driver Peak Current Capability | 1A |
| Maximum Junction Temperature | +150°C |
The LM3478 is suitable for use in topologies requiring low side FET, such as boost, flyback, SEPIC, etc.
The switching frequency can be adjusted to any value between 100kHz and 1MHz by using a single external resistor.
Power saving shutdown mode reduces the total supply current to 5uA.