DESCRIPTION
SP3406 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages, such as 1.5V,1.8V,etc. Supply
current with no load is 30uA and drops to <1uA in shutdown. The 2.5 to 6.5V input voltage range makes the SP3406 ideally suitable for single Li-Ion, two to four AA battery-powered applications. In low dropout operation mode, the

FEATURES
High Efficiency: Up to 96%;
1.5MHz Constant Switching Frequency;
600mA Output Current at Vin=3V;
Integrated Main Switch and Synchronous Rectifier, No Schottky Diode Required;
2.5 to 6.5V input voltage;
Output Voltage as Low as 0.6V;
100% Duty Cycle in Dropout;
Quiescent Current: 30uA(input<4.2V);
Slope Compensated Current Mode Control for Excellent Line and Load Transient Response;
Short Circuit Protection and Thermal Fault Protection;
<1uA Shutdown Current;
Soft Start;

APPLICATIONS
Digital Camera
PDA
Hand Held Communication Equipment
Wireless and DSL Modems
Portable instrument
Microprocessor and DSP Core Supplies
MID or UPMC