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