LTC3770 Series

Fast No RSENSE™Step-Down Synchronous Controller with Margining, Tracking and PLL

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

Fast No RSENSE™Step-Down Synchronous Controller with Margining, Tracking and PLL

Part	Operating Temperature [Max]	Operating Temperature [Min]	Duty Cycle (Max) [Max]	Control Features	Topology	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Number of Outputs	Mounting Type	Output Phases	Supplier Device Package	Output Type	Output Configuration	Function	Package / Case
Analog Devices Inc./Maxim Integrated LTC3770EUH#PBF	85 C	-40 ¯C	90 %	Current Limit Enable On Time Control Power Good Soft Start Tracking	Buck	4 V	32 V	1	Surface Mount	1	32-QFN (5x5)	Transistor Driver	Positive	Step-Down
Analog Devices Inc./Maxim Integrated LTC3770EG#PBF	85 C	-40 ¯C	90 %	Current Limit Enable On Time Control Power Good Soft Start Tracking	Buck	4 V	32 V	1	Surface Mount	1	28-SSOP	Transistor Driver	Positive	Step-Down	28-SSOP (0.209" 5.30mm Width)
Analog Devices Inc./Maxim Integrated LTC3770EG#TRPBF	85 C	-40 ¯C	90 %	Current Limit Enable On Time Control Power Good Soft Start Tracking	Buck	4 V	32 V	1	Surface Mount	1	28-SSOP	Transistor Driver	Positive	Step-Down	28-SSOP (0.209" 5.30mm Width)
Analog Devices Inc./Maxim Integrated LTC3770EUH#TRPBF	85 C	-40 ¯C	90 %	Current Limit Enable On Time Control Power Good Soft Start Tracking	Buck	4 V	32 V	1	Surface Mount	1	32-QFN (5x5)	Transistor Driver	Positive	Step-Down

Catalog

Fast No RSENSE™Step-Down Synchronous Controller with Margining, Tracking and PLL

Description

The LTC3770 is a synchronous step-down switching regulator controller with output voltage up/down tracking capability and voltage margining. Its advanced functions and high accuracy reference are ideal for powering high performance server, ASIC and computer memory systems.The LTC3770 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. The operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-lock loop allows the IC to be synchronized to an external clock.Fault protection is provided by an overvoltage comparator and input undervoltage lockout. The regulator current limit is user programmable. A wide supply range allows voltages as high as 32V to be stepped down to as low as a 0.6V output. Power supply sequencing is accomplished using an external soft-start timing capacitor.ApplicationsDistributed Power SystemsServer Power Supply