Power by Linear / Analog Devices LTC3777ILXE#PBF is a buck-boost switching regulator controller. This device 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 600 kHz, while an input/output constant current loop provides support for battery charging. The 150 V integrated switching bias supply is a high-efficiency step-down regulator that draws only 12 μA typical DC supply current with a regulated output voltage at no load.The LTC3777ILXE#PBF 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. With a 4.5 V to 150 V input and output range and seamless transfers between operating regions, the LTC3777ILXE#PBF is ideal for industrial, telecom, and battery-powered systems.
Feature
- 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
Applications
- Industrial, Transportation, Medical, Military, Avionics
