描述 Description

The LM3481 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is suitable for use in topologies requiring a low-side FET, such as boost, flyback, SEPIC, and so on. The LM3481 device can be operated at extremely high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481 device can be adjusted to any value between 100kHz and 1MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor.

The LM3481 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. 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.

特性 Features

? LM3481QMM are Automotive-Grade Products That are AEC-Q100 Grade 1 Qualified (–40°C to +125°C Operating Junction Temperature)
? 10-Lead VSSOP Package
? Internal Push-Pull Driver With 1-A Peak Current Capability
? Current Limit and Thermal Shutdown
? Frequency Compensation Optimized With a Capacitor and a Resistor
? Internal Softstart
? Current Mode Operation
? Adjustable Undervoltage Lockout With Hysteresis
? Pulse Skipping at Light Loads
? Key Specifications
? Wide Supply Voltage Range of 2.97 V to 48 V
? 100-kHz to 1-MHz Adjustable and Synchronizable Clock Frequency
? ±1.5% (Over Temperature) Internal Reference
? 10-μA Shutdown Current (Over Temperature)