ETA3521FSG

The ETA3521 is a high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to 4A of output current. The devices operate from an input voltage range of 2.5V to 6.0V and provide output voltages from 0.6V to VIN, making the ETA3521 ideal for low voltage power conversions. ETA3521 adopts an adaptive COT control scheme that enables very fast transient response and provides a very smooth transition when the output varies from light load to heavy load. During light load, ETA3521 goes into a PFM mode that saves switching loss to achieve a high efficiency. The adaptive COT control also maintains a constant switching frequency across line and load. Running at a fixed frequency of 2MHz allows the use of small inductance value and low DCR inductors, thereby achieving a higher efficiency. Other external components, such as ceramic input and output caps, can also be small due to higher switching frequency, while maintaining exceptional low-noise output voltages. Internal soft-start control circuitry reduces inrush current. Short-circuit and thermal-overload protection improves design reliability. ETA3521 is available in a tiny SOT563 package.

Applications

• LCD TV
• Set Top Box
• IP CAM

Key features

• Up to 95% Efficiency
• Up to 4A Max Output Current
• Adaptive COT Control
• Ultra-fast Load Transient Response
• 2MHz Frequency
• High Efficiency PFM Mode at Light Load
• 50uA Quiescent Current
• 1% Feedback Accuracy
• Adjustable Output Voltage from 0.6V
• Cycle-by-cycle Over Current Protection
• Short Circuit Protection with Hiccup Mode
• Stable with Low-ESR Output Ceramic Capacitors
• Available in SOT563 Package