LTC7878 Series

70V Parallelable 4-Switch Buck-Boost Controller with Inductor DCR Current Sensing

Catalog

70V Parallelable 4-Switch Buck-Boost Controller with Inductor DCR Current Sensing

Part	Board Type	Voltage - Output	Regulator Topology	Voltage - Input [Max]	Voltage - Input [Min]	Frequency - Switching	Current - Output	Main Purpose	Utilized IC / Part	Outputs and Type	Outputs and Type	Supplied Contents	Function	Duty Cycle (Max)	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Topology	Clock Sync	Output Configuration	Control Features	Number of Outputs	Frequency - Switching [Min]	Frequency - Switching [Max]	Mounting Type	Output Type	Operating Temperature [Min]	Operating Temperature [Max]	Supplier Device Package	Synchronous Rectifier	Output Phases
Analog Devices DC2931A	Fully Populated	12 V	Buck-Boost	55 V	9 VDC	260 kHz	6 A	DC/DC Step Up or Down	LTC7878	Non-Isolated	1	Board(s)
Analog Devices LTC7878AUH#TRPBF													Step-Up/Step-Down	90 %	5 V	70 V	Buck-Boost		Positive	Current Limit Dead Time Control Frequency Control Phase Control Soft Start	1	50 kHz	800 kHz	Surface Mount	Transistor Driver	-40 °C	125 ¯C	32-QFN (5x5)		1

Catalog

70V Parallelable 4-Switch Buck-Boost Controller with Inductor DCR Current Sensing

Key Features

• Single Inductor Architecture Allows VINAbove, Below or Equal to the Regulated VOUT

• Synchronous Rectification: Up to 98% Efficiency

• Wide VINVoltage Range: 5V to 70V

• ±1% Output Voltage Accuracy: 1V ≤ VOUT≤ 70V

• DCR or RSENSECurrent Sensing

• Peak Current Mode Control in Buck/Boost/Buck-Boost Mode

• Programmable Input or Output Current Regulation

• 7V NMOS Gate Drivers

• Phase-Lockable Frequency (100kHz to 600kHz)

• Multiphase/Multi-ICs Parallel Operation

• Selectable Continuous or Pulse-Skipping Mode Operation and Inductor Peak Current Limits

• Small 32-Lead 5mm × 5mm QFN Package

Description

The LTC7878 is a high performance buck-boost switching regulator controller that operates from an input voltage above, below or equal to the output voltage. The constant-frequency, peak current mode architecture allows a phase-lockable switching frequency of up to 600kHz, while a programmable input or output current loop regulates the average input or output current accurately supporting battery charging applications. With a wide 5V to 70V input and output range and seamless, low noise transitions between operating regions, the LTC7878 is ideal for industrial and telecom systems.The LTC7878 features forced continuous mode (FCM)/pulse-skipping mode operation. It supports multiphase/multi-ICs parallel operation for high power applications. Additional features include 7V N-Channel gate drivers, smart EXTVCCauxiliary supply and programmable inductor peak current limit. A PGOOD pin indicates when the output is within 10% of its designed set point.The LTC7878 is available in a low profile 32-Lead QFN package.APPLICATIONSIndustrial and Telecom SystemsDistributed DC Power or Battery Systems