DESCRIPTION
The RS8407 is 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 45uA and drops to <1uA in shutdown. The 2.7V to 5.5V input voltage range makes the RS8407 ideally suited for single Li-Ion, two to four AA battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. In power saving mode, 45uA quiescent current is very suitable for DSP/MCU in standby operation; and in PWM mode, low output ripple voltage is good enough for noise sensitive applications. The two modes can be automatically switched according to the load current.

FEATURES
● High Efficiency: Up to 95%
● 1.5MHz Constant Switching Frequency
● Integrated Main switch and synchronous rectifier.
   No Schottky Diode Required
● Shutdown Current: <1μA
● 2.7V to 5.5V Input Voltage Range
● Output Voltage as Low as 0.6V
● 100% Duty Cycle in Dropout
● Quiescent Current : 45μA (TYP.)
● Slope Compensated Current Mode Control for
   Excellent Line and Load Transient Response
● Short Circuit Protection
● <1uA Shutdown Current

APPLICATIONS
● Smart Phones
● Set Top Box
● Personal Information Appliances
● Wireless and DSL Modems
● MP3 Players
● Portable Instruments