LM3489-Q1 Datasheet | Texas Instruments

Features - 1 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 pensation 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 - 2 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 3 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 ponents. The PFET architecture also allows for low ponent 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. Device Information(1) PART NUMBER PACKAGE BODY SIZE...