Analog Devices LTC3777 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
• Integrated 12μA I_Q, 150V, 85mA, Switching Bias for Optimal Thermal Performance
• 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
• 150V Rated RUN Pin with Accurate Turn-On Threshold
• Thermally Enhanced 48-Lead e-LQFP Package

The LTC3777 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 phase-lockable frequency of up to 600kHz, while an input/output constant current loop provides support for battery charging. The 150V integrated switching bias supply is a high efficiency step-down regulator that draws only 12μA typical DC supply current with a regulated output voltage at no load.

With a wide 4.5V to 150V input and output range and seamless transfers between operating regions, the LTC3777 is ideal for industrial, telecom and battery powered systems.

The LTC3777 features a power good output indicator and a MODE pin to select between pulse-skipping mode or forced continuous mode of operation. 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, Transportation, Medical, Military, Avionics