LTC3874-1 Series

PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing

Catalog

PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing

Part	Number of Outputs	Function	Frequency - Switching [Max]	Frequency - Switching [Min]	Topology	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Output Configuration	Package / Case	Output Phases	Supplier Device Package	Control Features	Mounting Type	Output Type
Analog Devices LTC3874IUF-1#TRPBF	2	Step-Down	1 MHz	250 kHz	Buck	-40 °C	125 ¯C	38 V	4.5 V	Positive	24-WFQFN Exposed Pad	2	24-QFN (4x4)	Current Limit Enable Frequency Control Phase Control	Surface Mount	Transistor Driver
Analog Devices LTC3874IUFD#PBF	2	Step-Down	1 MHz	250 kHz	Buck	-40 °C	125 ¯C	38 V	4.5 V	Positive	28-WFQFN Exposed Pad	2	28-QFN (4x5)	Current Limit Enable Frequency Control Phase Control	Surface Mount	Transistor Driver
Analog Devices LTC3874EUFD#PBF	2	Step-Down	1 MHz	250 kHz	Buck	-40 °C	125 ¯C	38 V	4.5 V	Positive	28-WFQFN Exposed Pad	2	28-QFN (4x5)	Current Limit Enable Frequency Control Phase Control	Surface Mount	Transistor Driver
Analog Devices LTC3874IUFD#TRPBF	2	Step-Down	1 MHz	250 kHz	Buck	-40 °C	125 ¯C	38 V	4.5 V	Positive	28-WFQFN Exposed Pad	2	28-QFN (4x5)	Current Limit Enable Frequency Control Phase Control	Surface Mount	Transistor Driver

Catalog

PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing

Key Features

• Phase Extender for High Phase Count Voltage Rails

• Operates with Power Blocks, DrMOS or External Gate Drivers and MOSFETs

• Accurate Phase-to-Phase Current Sharing

• Sub-Milliohm DCR Current Sensing

• Phase-Lockable Fixed Frequency 250kHz to 1MHz

• Immediate Response to Master IC's Fault

• Up to 12-Phase Operation

• Wide VINRange: 4.5 to 38V

• VOUTRange :Up to 3.5V (LOWDCRPin High)Up to 5.5V (LOWDCR Pin Low)

• Up to 3.5V (LOWDCRPin High)

• Up to 5.5V (LOWDCR Pin Low)

• Proprietary Current Mode Control Loop

• Programmable CCM/DCM Operation

• Programmable Phase Shift Control n 24-Lead (4mm × 4mm) QFN Package

Description

The LTC3874-1 is a dual PolyPhase®current mode synchronous step-down slave controller. It enables high current, multiphase applications when paired with a companion master controller by extending the phase count. Compatible master controllers include the LTC3884-1, LTC3774, LTC3875, LTC3877 and LTC3866. The LTC3874-1 employs a unique architecture that enhances the signal-to-noise ratio of the current sense signal, allowing the use of submilliohm DC resistance power inductors to maximize efficiency while reducing switching jitter. Its peak current mode architecture allows for accurate phase-to-phase current sharing even for dynamic loads.Effectively working with a master controller, the LTC3874-1 supports all the programmable features as well as fault protection.ApplicationsHigh Current Distributed Power SystemsTelecom, Datacom and Storage SystemsIntelligent Energy Efficient Power Regulation