DESCRIPTION
The LTC®3713 is a high current, high efficiency synchronous buck switching regulator controller optimized for use with very low input supply voltages. It operates from inputs as low as 1.5V and provides a regulated output voltage from 0.8V up to (0.9)VIN. The controller uses a valley current control architecture to enable high operating frequencies without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VINand VOUT. The LTC3713 uses a pair of standard 5V logic-level N-channel external MOSFETs, eliminating the need for expensive P-channel or low threshold devices.

FEATURES
■ Very Low VIN(MIN): 1.5V
■ True Current Mode Control
■ 5V Drive for N-Channel MOSFETs Eliminates Auxillary 5V Supply
■ No Sense Resistor Required
■ Uses Standard 5V Logic-Level N-Channel MOSFETs
■ Adjustable Current Limit
■ Adjustable Frequency
■ Switch tON(MIN) < 100ns
■ 2% to 90% Duty Cycle at 200kHz
■ 0.8V ±1% Reference
■ Power Good Output Voltage Monitor
■ Programmable Soft-Start
■ Output Overvoltage Protection
■ Optional Short-Circuit Shutdown Timer
■ Small 24-Lead SSOP Package

APPLICATIONS
■ Telecom Card 3.3V, 2.5V, 1.8V Step-Down
■ Bus Termination (DDR memory, SSTL)
■ Synchronous Buck with General Purpose Boost
■ Low VIN Synchronous Boost