LTC3777 Series

150V VINand VOUTSynchronous 4-Switch Buck-Boost Controller + Switching Bias Supply

Catalog

150V VINand VOUTSynchronous 4-Switch Buck-Boost Controller + Switching Bias Supply

Part	Package / Case	Function	Output Configuration	Number of Outputs	Output Phases	Topology	Synchronous Rectifier	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Output Type	Frequency - Switching [Max]	Frequency - Switching [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Clock Sync	Control Features	Duty Cycle (Max) [Max]	Supplier Device Package
Analog Devices LTC3777ILXE#PBF	48-LQFP Exposed Pad	Step-Up/Step-Down	Positive	1	1	Buck-Boost		150 V	4.5 V	Transistor Driver	600 kHz	50 kHz	125 °C	-40 °C	Surface Mount		Current Limit Enable Frequency Control Soft Start	90 %	48-eLQFP (7x7)

Catalog

150V VINand VOUTSynchronous 4-Switch Buck-Boost Controller + Switching Bias Supply

Key Features

• 4-Switch Current Mode Single Inductor Architecture Allows VINAbove, Below or Equal to VOUT

• Wide VINRange: 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 DRVCCOptimizes Efficiency

• No Top FET Refresh Noise in Boost or Buck Mode

• VOUTDisconnected from VINDuring 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

Description

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.ApplicationsIndustrial, Transportation, Medical, Military, Avionics