Analog Devices LTC3779 Product Info

• 4-Switch Current Mode Single Inductor Architecture Allows V_IN Above, Below or Equal to V_OUT
• Wide V_IN Range: 4.5V to 150V
• Wide Output Voltage Range: 1.2V ≤ V_OUT ≤ 150V
• Synchronous Rectification: Up to 99% Efficiency
• ±1% 1.2V Voltage Reference
• Input or Output Average Current Limit
• On-Board LDO or External NMOS LDO for DRV_CC
• 36V EXTV_CC LDO Powers Drivers
• Programmable 6V to 10V DRV_CC Optimizes Efficiency
• No Top FET Refresh Noise in Boost or Buck Mode
• V_OUT Disconnected from V_IN 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

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.

Applications

• Industrial, Automotive, Medical, Military, Avionics