150V V and V Synchronous 4-Switch Buck-Boost Controller + Switching Bias Supply

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

* 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 99% Efficiency

* ±1% 1.2V Voltage Reference

* Input or Output Average Current Limit

* Integrated 12μA IQ, 150V, 85mA, Switching Bias for Optimal Thermal Performance

* 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

* 150V Rated RUN Pin with Accurate Turn-On Threshold

* Thermally Enhanced 48-Lead e-LQFP Package