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LM3489 Datasheet PDF - Texas Instruments

Part NumberLM3489 TI
Texas Instruments TI
DescriptionHysteretic PFET Buck Controller With Enable Pin
LM3489 Datasheet PDF : LM3489 pdf   
LM3489MM/NOPB image

Description
The LM3489 device 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 7 µA. Leaving the enable pin unconnected defaults to on.
Current limit protection can be implemented by measuring the voltage across the PFET’s RDS(ON), thus eliminating the need for a sense resistor. A sense resistor may be used to improve current limit accuracy if desired. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents.

Features
• Qualified for Automotive Parts
• AEC-Q100 Qualified With the Following Results:
   – Device Temperature Grade 1: –40°C to 125°C
      Ambient Operating Temperature Range
   – Device HBM ESD Classification Level 2
   – Device CDM ESD Classification Level C5
• Easy-to-Use Control Methodology
• No Control Loop Compensation Required
• Wide 4.5-V to 35-V Input Range
• 1.239 V to VIN Adjustable Output Range
• High Efficiency: 93%
• ±1.3% (±2% Over Temperature) Internal Reference
• 100% Duty Cycle Operation
• Maximum Operation Frequency > 1 MHz
• Current Limit Protection
• Dedicated Enable Pin (on if Unconnected)
• Shutdown Mode Draws Only 7-µA Supply Current
• 8-Pin VSSOP Package

Applications
• Set-Top Boxes
• DSL or Cable Modems
• PC/IA
• Auto PCs
• TFT Monitors
• Battery-Powered Portable Applications
• Distributed Power Systems
• Always-On Power
• High-Power LED Drivers
• Automotive

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