RY8017

A high-efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version. Supply current with no load is 40uA and drops to <1uA in shutdown. The 2.5V to 5.5V input voltage range makes it ideally suited for single Li-Ion battery powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM/PFM mode operation provides very low output ripple voltage for noise sensitive applications. Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. Low output voltages are easily supported with the 0.6V feedback reference voltage. It requires a minimal number of readily available, external components and is available in a space saving SON763 package.

Applications

• Cellular and Smart Phones
• Wireless and DSL Modems
• PDAs
• Portable Instruments
• Digital Still and Video Cameras
• PC Cards

Key features

• 2.5V to 5.5V Input Voltage Range
• 1A Continuous Output Current
• 1.5MHz Switching Frequency
• Built-in Short Protection with Foldback Mode
• Built-in Over Current Limit
• Built-in Over Voltage Protection
• PFM Mode for High Efficiency in Light Load
• Internal Soft-Start
• High Efficiency: Up to 96%
• Output Adjustable from 0.6V
• No Schottky Diode Required
• Low Dropout Operation: 100% Duty Cycle
• Over Temperature Protected
• Low Quiescent Current: 40μA
• Available in SON763 package
• -40°C to +85°C Temperature Range