16V 3A 1.2MHz ECOT Sync Step-Down Regulator
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Features
• Wide 4.5V to 16V Operating Input Range
• 3A Continuous Output Current
• 1.2MHz Switching Frequency
• ECOT Mode Control with Fast Transient 
Response
• Built-in Over Current Limit
• Built-in Over Voltage Protection
• Force-PWM Mode
• Internal Soft-Start
• 70mΩ/50mΩ Low RDS(ON) Internal Power
MOSFETs
• Output Adjustable from 0.6V
• No Schottky Diode Required
• Short Protection with Hiccup-Mode
• Integrated internal compensation
• Thermal Shutdown
• Available in SOT23-6 Package
• -40°C to +85°C Temperature Range
Applications
• Digital Set-top Box (STB)
• Tablet Personal Computer (Pad)
• Flat-Panel Television and Monitor
• Wi-Fi Router / AP
• Digital Video Recorder (DVR)
• Portable Media Player (PMP)
• Cable Modem / XDSL
• General Purposes
General Description
The RY9131E is a high frequency, synchronous, rectified, step-down, switch-mode converter with internal power 
MOSFETs. It offers a very compact solution to provide a 3A continuous output current over a wide input supply 
range, with excellent load and line regulation. ECOT control operation provides very fast transient response and 
easy loop design as well as very tight output regulation.
The RY9131E requires a minimal number of readily available, external components and is available in a space 
saving SOT23-6 package.