AMS1117-3.0.pdf

1A Adjustable/Fixed Low Dropout Linear Regulator - Low dropout voltage - Load regulation: 0.2% typical - Optimized for Low Voltage - On-chip thermal limiting - Standard SOT-223 and TO-252 packages - Three-terminal adjustable or fixed low dropout 1.2V,1.5V,1.8V, 2.5V, 2.85V, 3.3V, 5V. Regulators - Active SCSI terminators - High efficiency linear regulators - Post regulators for switching supplies - Battery chargers - 12V to 5V linear regulators - Motherboard clock supplies The AMS1117-ADJ and AMS1117-1.2,-1.5,-1.8,-2.5,-2.85, -3.3 and-5 are low dropout three-terminal regulators with 1A output current capability. These devices have been optimized for low voltage where transient response and minimum input voltage are critical. The 2.85V version is designed specifically to be used in Active Terminators for SCSI bus. On-chip thermal limiting provides protection against any combination of overload and ambient temperatures that would create excessive junction temperatures. Unlike PNP type regulators where up to 10% of the output current is wasted as quiescent current, the quiescent cur- rent of the AMS1117 flows into the load, increasing effi- ciency. The AMS1117 series regulators are available in the indus- try-standard SOT-223 and TO-252 power packages. Key Features Applications General Description Typical Application Notice: The distance between Vout pin and Capacitor should not exceed 4cm for excellent performance Figure 1. Typical Applications of AMS1117 1A Adjustable/Fixed Low Dropout Linear Regulator Pin Assignments *With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, ΘJA can vary from 30°C/W to more than 50°C/W. Other mounting techniques may provide better thermal resistance than 30°C/W. Absolute Maximum Ratings Figure 2. Pin Assignments of AMS1117 Parameter Min. Max. Unit VIN 18 V (VIN – VOUT) * IOU