ADI LTC3779HFE#PBF

The LTC3779 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The constant frequency current mode architecture allows a phaselockable frequency of up to 600kHz, while an input/ output constant-current loop provides support for battery charging. With a wide 4.5V to 150V input and output range and seamless transfers between operating regions, the LTC3779 is ideal for automotive, telecom and batterypowered systems. The LTC3779 features a precision 1.2V reference and power good output indicator. The MODE pin can select between pulse-skipping mode or forced continuous mode of operation. Pulse-skipping mode offers high efficiency at light load while forced continuous mode operates at a constant frequency for noise sensitive applications. The PLLIN pin allows the IC to be synchronized to an external clock. The SS pin ramps the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions.

• 4-Switch Current Mode Single Inductor Architecture
• Allows VIN Above, Below or Equal to VOUT
• Wide VIN Range: 4.5V to 150V
• Wide Output Voltage Range: 1.2V ≤ VOUT ≤ 150V
• Synchronous Rectification: Up to 9% Efficiency
• ±1% 1.2V Voltage Reference
• Input or Output Average Current Limit
• Onboard LDO or External NMOS LDO for DRVCC
• 36V EXTVCC LDO Powers Drivers
• Programmable 6V to 10V DRVCC Optimizes Efficiency
• No Top FET Refresh Noise in Boost or Buck Mode
• VOUT Disconnected from VIN During Shutdown
• Phase-Lockable Fixed Frequency (50kHz to 600kHz)
• No Reverse Current During Start-Up
• Power Good Output Voltage Monitor
• 150V Rated RUN Pin with Accurate Turn-On Threshold
• Programmable Input Overvoltage Lockout
• Thermally Enhanced FE38 TSSOP Package Modified for High Voltage Operation

• Industrial
• Automotive
• Medical