LTC3707-SYNC

LTC3707-SYNC High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator FEATURES DESCRIPTION n 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise n OPTI-LOOP® Compensation Minimizes COUT n Dual N-Channel MOSFET Synchronous Drive n ±1.5% Output Voltage Accuracy n Power Good Output Voltage Monitor n Phase-Lockable Fixed Frequency 150kHz to 300kHz n Wide VIN Range: 4.5V to 28V Operation n Very Low Dropout Operation: 99% Duty Cycle n Adjustable Soft-Start Current Ramping n Foldback Output Current Limiting n Latched Short-Circuit Shutdown with Defeat Option n Output Overvoltage Protection n Remote Output Voltage Sense n Low Shutdown IQ: 20μA n 5V and 3.3V Standby Regulators n Small 28-Lead Narrow SSOP Package (0.150˝ Wide) n Selectable Constant Frequency, Burst Mode® or PWM Operation APPLICATIONS n Notebook and Palmtop Computers, PDAs n Telecom Systems n Portable Instruments n Battery-Operated Digital Devices n DC Power Distribution Systems The LTC®3707-SYNC is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows phase-lockable frequency of up to 300kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. ...