描述 Description

General Description
The LM3489 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, cost effective, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control loop stability concerns using a wide variety of external components. The PFET ar chitecture also allows for low component count as well as ultra-low dropout, 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple. A dedicated Enable Pin provides a shutdown mode drawing only 7μA. Leaving the Enable Pin unconnected defaults to on.

特性 Features

■ Easy to use control methodology
■ No control loop compensation required
■ Wide 4.5V to 35V input range
■ 1.239V to VIN adjustable output range
■ High efficiency 93%
■ ±1.3% (±2% over temp) internal reference
■ 100% duty cycle operation
■ Maximum operation frequency 1MHz
■ Current limit protection
■ Dedicated enable pin (on if unconnected)
■ Shutdown mode draws only 7μA supply current
■ MSOP-8
■ LM3489 is AEC-Q100 Grade 1 qualifiedApplications
■ Set-Top Box
■ DSL/Cable Modem
■ PC/IA
■ Auto PC
■ TFT Monitor
■ Battery Powered Portable Applications
■ Distributed Power Systems
■ Always On Power
■ High Power LED Driver
■ Automotive

應(yīng)用 Application

■ Set-Top Box
■ DSL/Cable Modem
■ PC/IA
■ Auto PC
■ TFT Monitor
■ Battery Powered Portable Applications
■ Distributed Power Systems
■ Always On Power
■ High Power LED Driver
■ Automotive