LTC7821 Series

Hybrid Step-Down Synchronous Controller

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

Hybrid Step-Down Synchronous Controller

Part	Output Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Topology	Supplier Device Package	Duty Cycle (Max) [Max]	Mounting Type	Control Features	Number of Outputs	Output Type	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Frequency - Switching [Max]	Frequency - Switching [Min]	Output Phases	Function	Outputs and Type	Outputs and Type	Supplied Contents	Board Type	Frequency - Switching	Utilized IC / Part	Contents	Voltage - Input [Min]	Voltage - Input [Max]	Regulator Topology	Voltage - Output	Main Purpose	Current - Output
Analog Devices Inc./Maxim Integrated LTC7821IUH#TRPBF	Positive	-40 C	125 °C	Buck	32-QFN (5x5)	40 %	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start Tracking	1	Transistor Driver	10 V	72 V	1.5 MHz	200 kHz	2	Step-Down
Analog Devices Inc./Maxim Integrated DC2787A																	1	1 Non-Isolated Output Non-Isolated	Board(s)	Fully Populated	400 kHz	LTC7821	Board(s)	40 V	60 V	Buck	12 V	DC/DC Step Down	100 A
Analog Devices Inc./Maxim Integrated LTC7821EUH#PBF	Positive	-40 C	125 °C	Buck	32-QFN (5x5)	40 %	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start Tracking	1	Transistor Driver	10 V	72 V	1.5 MHz	200 kHz	2	Step-Down
Analog Devices Inc./Maxim Integrated LTC7821IUH#PBF	Positive	-40 C	125 °C	Buck	32-QFN (5x5)	40 %	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start Tracking	1	Transistor Driver	10 V	72 V	1.5 MHz	200 kHz	2	Step-Down
Analog Devices Inc./Maxim Integrated LTC7821EUH#TRPBF	Positive	-40 C	125 °C	Buck	32-QFN (5x5)	40 %	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start Tracking	1	Transistor Driver	10 V	72 V	1.5 MHz	200 kHz	2	Step-Down

Catalog

Hybrid Step-Down Synchronous Controller

Description

The LTC7821 uses a proprietary architecture that merges a soft switching charge pump topology with a synchronous step-down converter to provide superior efficiency and EMI performance compared to traditional switching architectures.In a typical 48V to 12V application, efficiency of greater than 97% is attainable with the LTC7821 switching at 500kHz. The same efficiency can only be achieved with a traditional controller switching at one-third the frequency. Higher switching frequencies allow the use of smaller inductances that yield faster transient response and smaller solution size.The LTC7821 can be easily paralleled to provide higher output currents with its accurate current sharing capability and frequency synchronization function.ApplicationsIntermediate Bus ConvertersHigh Current Distributed Power SystemsTelecom, Datacom, and Storage Systems