Features
• Wide 4V to 38V Operating Input Range
• Standoff Voltage: 42V
• 1.2A Continuous Output Current
• 800KHz Switching Frequency
• Short Protection with Foldback-Mode
• Built-in Over Current Limit
• Built-in Over Voltage Protection
• Support PSM Mode
• Internal Soft-Start
• 250mΩ/150mΩ Low RDS(ON) Internal Power
MOSFETs
• Output Adjustable from 0.8V
• No Schottky Diode Required
• Integrated internal compensation
• Thermal Shutdown
• Available in SOT23-6 Package
• -40°C to +85°C Temperature Range

Applications
• Battery-Powered Equipment
• Portable Media Players
• Industrial Distributed Power Applications
• Portable Hand-Held Instruments

General Description
The RY8411 device is high-efficiency, synchronous step-down DC/DC regulators. With a wide input range, it is
suitable for a wide range of applications, such as power conditioning from unregulated sources. It features a low
RDSON (250mΩ/150mΩ typical) internal switch for maximum efficiency (92% typical). Supports PSM mode, the
operating frequency is fixed at 800kHz, allowing the use of small external components while still being able to have
low output voltage ripple. With OVP function, the IC can stand off input voltage as high as 42V. The RY8411
supports 1.2A continuous output current, and it has a 0.8V nominal feedback voltage.
Additional features include: thermal shutdown, VIN undervoltage lockout, and gate drive undervoltage lockout. The
RY8411 is available in a low-profile SOT23-6 package.