LTC3779 Series

150V VINand VOUTSynchronous 4-Switch Buck-Boost Controller

Catalog

150V VINand VOUTSynchronous 4-Switch Buck-Boost Controller

Part	Output Phases	Supplier Device Package	Output Configuration	Topology	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Duty Cycle (Max) [Max]	Output Type	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case [custom]	Package / Case	Package / Case	Package / Case [custom]	Control Features	Mounting Type	Number of Outputs	Function	Frequency - Switching [Max]	Frequency - Switching [Min]
Analog Devices LTC3779EFE#TRPBF	1	38-TSSOP-EP	Positive	Boost Buck	150 V	4.5 V	90 %	Transistor Driver	-40 °C	125 ¯C	0.173 "	38-TFSOP Exposed Pad	31 Leads	4.4 mm	Current Limit Power Good Soft Start	Surface Mount	1	Step-Down Step-Up	600 kHz	50 kHz
Analog Devices LTC3779EFE#PBF	1	38-TSSOP-EP	Positive	Boost Buck	150 V	4.5 V	90 %	Transistor Driver	-40 °C	125 ¯C	0.173 "	38-TFSOP Exposed Pad	31 Leads	4.4 mm	Current Limit Power Good Soft Start	Surface Mount	1	Step-Down Step-Up	600 kHz	50 kHz
Analog Devices LTC3779HFE#PBF	1	38-TSSOP-EP	Positive	Boost Buck	150 V	4.5 V	90 %	Transistor Driver	-40 °C	150 °C	0.173 "	38-TFSOP Exposed Pad	31 Leads	4.4 mm	Current Limit Power Good Soft Start	Surface Mount	1	Step-Down Step-Up	600 kHz	50 kHz

Catalog

150V VINand VOUTSynchronous 4-Switch Buck-Boost Controller

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

• On-Board LDO or External NMOSLDO for DRVCC

• 36V EXTVCCLDO Powers Drivers

• 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

• 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

Description

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.ApplicationsIndustrial, Automotive, Medical, Military, Avionics