LTC3850-1

LTC3850/LTC3850-1 Dual, 2-Phase Synchronous Step-Down Switching Controller FEATURES n Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise n High Efficiency: Up to 95% n RSENSE or DCR Current Sensing n ±1% 0.8V Output Voltage Accuracy n Phase-Lockable Fixed Frequency 250kHz to 780kHz n Supports Pre-Biased Output n Dual N-Channel MOSFET Synchronous Drive n Wide VIN Range: 4V to 24V (30V for LTC3850I) Operation n Adjustable Soft-Start Current Ramping or Tracking n Foldback Output Current Limiting n Power Good Output Voltage Monitor n 28-Pin 4mm × 4mm, 4mm × 5mm QFN and Narrow SSOP Packages n AEC-Q100 Qualified for Automotive Applications APPLICATIONS n Notebook and Palmtop Computers n Portable Instruments n Battery-Operated Digital Devices n DC Power Distribution Systems All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258. DESCRIPTION The LTC®3850 is a high performance dual synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages. A constant-frequency current mode architecture allows a phase-lockable frequency of up to 780kHz. Power loss and supply noise 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 an...