150V V and V Synchronous 4-Switch Buck-Boost Controller

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

* 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

* On-Board 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