LTC3850IUF#PBF

LTC3850 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 and ESR values. Independent TK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, or continuous inductor current mode and allows the IC to be synchronized to an external clock. Typical applications are notebook and Palmtop computers, portable instruments, battery-operated digital devices, DC power distribution systems.

• Dual, 180° phased controllers reduce required input capacitance and power supply induced noise
• High efficiency is up to 95%
• RSENSE or DCR current sensing, ±1% 0.8V output voltage accuracy
• Phase-lockable fixed frequency 250kHz to 780kHz
• Supports pre-biased output, dual N-channel MOSFET synchronous drive
• Adjustable soft-start current ramping or tracking, foldback output current limiting
• Power good output voltage monitor
• Regulated feedback voltage range from 0.792 to 0.808V at ITH1.2 voltage = 1.2V; TA = 25°C
• 28-lead (4mm × 4mm) plastic QFN package
• Temperature rating range from -40 to 85°C