VideosDocumentationDatasheet
Design Note
- DN547 - VID Controller with Phase Extender Provides 120A Power Supply for Latest Generation of FPGAs, ASICs and Processors
- DN549 - Powering Altera Arria 10 FPGA and Arria 10 SoC: Tested and Verified Power Management Solutions
Reliability Data
LT Journal
- 4-Phase Power Supply Delivers 120A in Tiny Footprint, Features Ultralow DCR Sensing for High Efficiency
- Avoid Debugging Cycles in Power Management for FPGA, GPU and ASIC Systems
Article
Press Release
- Proven Power Solutions for Altera Arria 10 FPGA
- Slave Current-Mode Step-Down Phase Extender for up to 300A with Sub-Milliohm DCR Sensing
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Features
- 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
Typical Application
Description
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.
4x5 QFN-28
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3874EUFD#PBF | QFN | 28 | E | $3.53 | $2.47 |
| LTC3874EUFD#TRPBF | QFN | 28 | E | $2.53 | |
| LTC3874IUFD#PBF | QFN | 28 | I | $3.79 | $2.65 |
| LTC3874IUFD#TRPBF | QFN | 28 | I | $2.71 |
Linear 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.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| 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 |