DESCRIPTION
The SP6659 is a 600mA synchronous buck regulator using a constant frequency, current mode architecture. The output voltage can be programmed using an external resistor divider. The 2.5V to 5.5V input voltage range is ideal for portable applications that use a Li-Ion battery. Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The output voltage can be programmed using an external resistor divider. Low output voltages are easily supported with the 0.6V feedback reference voltage. The SP6659 is available in a low profile 5 pin TSOT-23 package.

FEATURES
■ 94% Efficiency Possible
■ 600mA Output Current at VIN = 3.6V
■ 2.5V to 5.5V Input Voltage Range
■ 1.5MHz constant frequency operation
■ No Schottky Diode Required
■ Output Voltages as low as 0.6V
■ Slope Compensated Current Mode Operation for Excellent Line and Load Transient Response
■ 100 % Duty Cycle in LDO Mode
■ <1μA Shutdown Current, Quiescent Current of 300 μA
■ Over-temperature protected
■ Pin Compatible to LTC3406B
■ Offered in Low Profile TSOT-23 package

APPLICATIONS
■ Cell Phones
■ Wireless and DSL Modems
■ DSCs
■ Portable Instruments