深圳市中立信电子科技有限公司

1 Features

1• 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
2 Applications • Automotive Start-Stop Applications • Automotive ADAS Driver Information • One Cell/Two Cell Li-ion Battery Powered Portable Bluetooth Audio Systems • Notebooks, PDAs, Digital Cameras, and Other Portable Applications • Offline Power Supplies • Set-Top Boxes • Boost for Audio Amplifiers
3 Description The LM3481 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is designed for use in Boost, SEPIC and Flyback converters and topologies requiring a lowside FET as the primary switch. The LM3481 device can be operated at very 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.