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Texas Instruments
LM3489QMMX/NOPB Hysteretic PFET Buck Controller With Enable Pin

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 architecture 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.

• 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
• LM3489 is AEC-Q100 Grade 1 qualified

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

other parts : LM3489  LM3489-Q1  LM3489MM  LM3489MM/NOPB  LM3489MMX  LM3489MMX/NOPB  LM3489QMM  LM3489QMM/NOPB  LM3489QMMX  


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