General Description
The RT8010B is a high-efficiency Pulse-Width-Modulated (PWM) step-down DC-DC converter. Capable of delivering 800mA output current over a wide input voltage range from 2.5V to 4V, the RT8010B is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources such as cellular phones, PDAs and hand-held devices.
Two operating modes are available including PWM/Low Dropout autoswitch and shut-down modes. The internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application.
The RT8010B enters Low-Dropout mode when normal PWM can not provide regulated output voltage by continuously turning on the upper PMOS. The RT8010B enters shut-down mode and consumes less than 0.1μA when EN pin is pulled low.
The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operating frequency of 1.5MHz. This along with small WDFN-8L 2x2 package provides small PCB area application. Other features include soft start, lower internal reference voltage with 2% accuracy, over temperature protection, and over current protection.

FEATUREs
● +2.5V to +4V Input Range
● Output Voltage (Adjustable Output From 0.6V to VIN)
● 800mA Output Current
● 95% Efficiency
● No Schottky Diode Required
● 1.5MHz Fixed-Frequency PWM Operation
● Small 8-Lead WDFN Package
● RoHS Compliant and 100% Lead (Pb)-Free

APPLICATIONs
● Mobile Phones
● Personal Information Appliances
● Wireless and DSL Modems
● MP3 Players
● Portable Instruments