LTC3874 - PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing
- Phase Extender for High Phase Count Voltage Rails
- 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 VIN Range: 4.5V to 38V
- VOUT Range: Up to 3.5V (LOWDCR Pin = INTVCC)
Up to 5.5V (LOWDCR Pin = OV)
- Proprietary Current Mode Control Loop
- Programmable CCM/DCM Operation
- Programmable Phase Shift Control
- Dual N-Channel MOSFET Gate Drivers
- 28-Lead (4mm × 5mm) QFN Package
AEC-Q100 data available for specific packages
The LTC®3874 is a dual PolyPhase® current mode synchronous step-down slave controller. It enables high current, multi-phase applications when paired with a companion master controller by extending the phase count. Compatible master controllers include the LTC3884, LTC3866, LTC3877 and LTC3774. The LTC3874 employs a unique architecture that enhances the signal-to-noise ratio of the current sense signal, allowing the use of sub-milliohm 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 supports all the programmable features as well as fault protection.
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
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Demo BoardsLinear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
|DC2084A||LTC3884EUK/LTC3874EUFD Demo Board | PolyPhase Digital PSM Buck with Sub-mΩ DCR Sensing Plus Two Slave Controllers, 10V ≤ VIN ≤ 14V, Vout = 0.5V to 1.5V @ 240A||Contact Factory|
|DC2142A||LTC3875EUJ/LTC3874IUFD Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A||$225.00|
|DC2229A-B||LTC3877/LTC3874 Demo Board | 4-Phase Buck Controller with VID Inputs, Sub-mΩ DCR sensing, 6V ≤ VIN ≤ 14V, Vout = 0.6V to 1.23V at 120A||Contact Factory|
Designed for Automotive and Transportation ApplicationsAEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
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- High Current Distributed Power Systems
- Telecom, Datacom, and Storage Systems
- Intelligent Energy Efficient Power Regulation
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