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Analog Devices Inc. LTC3874EUFD#TRPBF
- Part No.:
- LTC3874EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3874EUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,130
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Product details
Overview
LTC3874EUFD#TRPBF from Analog Devices is a dual-phase PolyPhase® synchronous step-down slave controller designed to extend phase count in high-current multiphase DC/DC converters when paired with compatible master controllers (e.g., LTC3884, LTC3866). It supports 250kHz–1MHz switching, sub-milliohm DCR current sensing (down to 0.2mΩ), and precise phase-to-phase current sharing across up to 12 phases. Used in telecom/datacom power rails delivering 1.8V/120A with 95% efficiency at full load.
For engineers reviewing the LTC3874EUFD#TRPBF datasheet, LTC3874EUFD#TRPBF pinout, LTC3874EUFD#TRPBF application, or LTC3874EUFD#TRPBF equivalent, key selection criteria include its role as a non-voltage-regulating current-mode slave IC, compatibility with master-controlled ITH-based current programming, sub-milliohm DCR sensing architecture, 28-lead QFN package thermal performance (θJA = 43°C/W), and phase-lockable synchronization via SYNC/PHASMD pins.
Technical Context
The LTC3874EUFD#TRPBF implements a proprietary peak current mode control loop where channel current is regulated solely by the master's ITH voltage-no independent voltage feedback. Its dual-channel architecture features independent RUN0/RUN1 enable inputs, MODE0/MODE1 selectable CCM/DCM operation, and programmable phase shift (0°–360° in 30° increments) via PHASMD voltage levels relative to INTVCC.
It integrates dual N-channel gate drivers with TG/BG RDS(ON) values of 2.6Ω/1.5Ω (TG) and 2.4Ω/1.1Ω (BG), minimum on-time of 60ns, and internal 5.5V INTVCC regulator (±2% line/load regulation). Sub-milliohm DCR sensing is enabled by pulling LOWDCR high, improving SNR by 14dB over conventional architectures to support accurate current measurement with 0.32mΩ inductor DCR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual-phase synchronous step-down slave controller-requires master IC for voltage regulation and ITH generation. |
| Switching Frequency | 250kHz–1MHz PLL-synchronizable range; set via 10µA FREQ pin current and external resistor. |
| DCR Sensing Range | Supports inductors with DCR as low as 0.2mΩ when LOWDCR = INTVCC; enables >95% efficiency at 120A output. |
| Current Sharing Accuracy | Peak current mode architecture ensures tight phase-to-phase current matching under dynamic load transients. |
| Input Voltage Range | 4.5V to 38V VIN; EXTVCC switchover at 4.7V enables efficient external biasing when VIN > 7V. |
| Output Voltage Control | No independent VOUT regulation-output voltage set and stabilized entirely by master controller's feedback loop. |
| Package | 28-lead 4mm × 5mm QFN with exposed thermal pad (Pin 29 = GND); θJC = 3.4°C/W. |
Pinout & Package
28-lead (4mm × 5mm) plastic QFN package with exposed GND pad (Pin 29) requiring solder connection to PCB ground plane for thermal and electrical integrity. θJA = 43°C/W, θJC = 3.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE0 / MODE1 (1, 8) | DCM/CCM mode select | Logic high = forced continuous conduction mode; floating or low = discontinuous mode; internal 500kΩ pull-down. |
| ISENSE0+/ISENSE1+ (2, 7) | Current sense comparator (+) input | Connects to RC filter on DCR network; common-mode range 0–3.5V when LOWDCR = INTVCC. |
| ISENSE0−/ISENSE1− (3, 6) | Current sense comparator (−) input | Direct connection to VOUT node; Kelvin routing critical for sub-milliohm accuracy. |
| RUN0 / RUN1 (4, 5) | Channel enable input | Logic high (>2V) enables channel; internal pull-down holds off until INTVCC > 3.8V UVLO threshold. |
| ITH0 / ITH1 (28, 9) | Master-set current threshold input | Accepts master's ITH voltage (1.58–2.40V) to program per-channel peak inductor current. |
| FREQ (10) | Frequency programming node | 10µA constant current sink; resistor to GND sets nominal frequency before SYNC lock. |
| SYNC (12) | External clock input | Falling-edge synchronized PLL input; locks to 250kHz–1MHz clocks; tie to GND if unused. |
| PHASMD (13) | Phase offset control | Voltage divider (GND, 1/3, 2/3, or INTVCC) selects 0°–360° phase shift relative to SYNC edge. |
| TG0/TG1 (24, 14) | Top gate driver output | Floating drivers with swing = INTVCC above SWx; RDS(ON) = 2.6Ω (high), 1.5Ω (low). |
| BG0/BG1 (21, 17) | Bottom gate driver output | GND-referenced drivers; RDS(ON) = 2.4Ω (high), 1.1Ω (low); drives N-MOSFET sources. |
| FAULT0 / FAULT1 (26, 25) | Master fault indicator input | Pull-down or float disables corresponding TG/BG; internal 500kΩ pull-down. |
| LOWDCR (27) | Sub-milliohm sensing enable | Internal 500kΩ pull-up to INTVCC; high = enhanced SNR mode for ≤0.32mΩ DCR. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-milliohm DCR sensing | Enables use of ultra-low-DCR inductors (0.2mΩ min) with 14dB SNR improvement-reduces conduction loss and switching jitter. |
| Programmable phase alignment | Four PHASMD voltage levels yield precise 30°-increment phase offsets between channels and SYNC-critical for RMS current reduction in input caps. |
| Master-slave current sharing | ITH-voltage-driven peak current control ensures matched per-phase current even during fast load transients-no external current-sharing resistors needed. |
| Independent channel control | RUN0/RUN1 and MODE0/MODE1 allow staggered startup, asymmetric light-load optimization, and fault-isolated shutdown per phase. |
| Robust gate drive | Dual N-MOSFET drivers with <30ns transition times and anti-shoot-through logic prevent cross-conduction-supports high-frequency, high-current operation. |
Applications
| Telecom Core Power Rail | Datacenter VR13 Server CPU Supply |
|---|---|
Use Scenario: High-current 1.8V supply for 5G baseband processors requiring 120A with <1% ripple and rapid transient response. IC Role / Device Role / Timing Role: Slave controller extending phase count beyond master's native capability-LTC3874EUFD#TRPBF handles two additional phases while tracking master's ITH command. Use Value: Enables 4-phase 120A design achieving 95% efficiency at full load using 0.32mΩ DCR inductors-reducing total power loss by 12W vs. traditional 1mΩ designs. | Use Scenario: Multiphase VR13-compliant CPU core supply with dynamic voltage/frequency scaling and strict ±3% VOUT tolerance. IC Role / Device Role / Timing Role: Synchronized slave phase controller locked to master's SYNC signal-ensures deterministic phase interleaving for input capacitor RMS current minimization. Use Value: Reduces required input capacitor RMS rating by 75% in 6-phase configuration-enabling smaller, lower-cost ceramic input banks without derating. |
| Industrial FPGA Power System | AI Accelerator Board Power |
Use Scenario: Programmable logic supply with soft-start, margining, and fault reporting for mission-critical industrial control systems. IC Role / Device Role / Timing Role: Current-regulated slave channel providing redundant current path-FAULT0/FAULT1 inputs link directly to master's fault bus for coordinated shutdown. Use Value: Guarantees <500ns fault propagation from master to all slave phases-meeting SIL-2 functional safety timing requirements for power sequencing. | Use Scenario: High-density 0.8V/150A GPU/AI core supply on PCIe add-in card with strict thermal envelope (<65°C ambient). IC Role / Device Role / Timing Role: Dual-phase slave operating in forced CCM (MODE0/1 = INTVCC) to suppress audio-band noise and maintain low output ripple during inference bursts. Use Value: Maintains <5mVpp output ripple at 150A with no audible coil whine-critical for noise-sensitive AI inference workloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase slave controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3875IUFD#TRPBF | Single-channel slave with identical DCR sensing, but lacks dual independent RUN/MODE pins-requires shared enable/control. | Suitable only for symmetric dual-phase extensions where both channels must operate identically. | Select LTC3874EUFD#TRPBF when independent channel control (e.g., staggered startup, per-phase DCM/CCM) is required. |
| LTC3877EUFD#TRPBF | Includes integrated MOSFET drivers with higher RDS(ON) (3.5Ω/2.0Ω) and no PHASMD pin-fixed 180° phase offset only. | Lower gate drive strength limits max switching frequency to 750kHz; no programmable phase alignment. | Choose LTC3874EUFD#TRPBF for designs needing >750kHz operation, precise phase tuning, or tighter gate drive specs. |
Compared with LTC3875IUFD#TRPBF and LTC3877EUFD#TRPBF, the LTC3874EUFD#TRPBF provides true dual-channel independence, 30°-granularity phase programming, and optimized gate drive for 1MHz operation-making it the only option supporting asymmetric control and maximum phase-count scalability in high-performance power systems.
Availability
LTC3874EUFD#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, datacenter server VRMs, and industrial FPGA power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3874EUFD#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, power management, and communications markets.
The LTC3874EUFD#TRPBF belongs to the PolyPhase® multiphase controller product line, engineered specifically for scalable, high-current DC/DC conversion in telecom, datacom, and AI accelerator applications where phase count extension and sub-milliohm current sensing are critical.
FAQ
What is the primary function of the LTC3874EUFD#TRPBF in a multiphase power system?
The LTC3874EUFD#TRPBF functions exclusively as a current-mode synchronous step-down slave controller-it does not regulate output voltage. Instead, it precisely controls per-phase inductor current by tracking the ITH voltage signal from a master controller (e.g., LTC3884), enabling accurate current sharing and phase count extension up to 12 phases. The LTC3874EUFD#TRPBF relies entirely on the master for voltage feedback, soft-start, and fault management.
How does the LOWDCR pin affect current sensing performance in the LTC3874EUFD#TRPBF?
The LOWDCR pin enables the LTC3874EUFD#TRPBF's proprietary sub-milliohm DCR sensing architecture: when pulled high (or left floating, due to internal 500kΩ pull-up), it activates a 14dB SNR enhancement circuit that allows stable operation with inductor DCR values as low as 0.2mΩ. When LOWDCR is pulled low, the IC reverts to standard DCR sensing with reduced sensitivity-making LOWDCR = INTVCC essential for achieving >95% efficiency in high-current, low-voltage rails.
Can the LTC3874EUFD#TRPBF operate without a master controller?
No-the LTC3874EUFD#TRPBF cannot operate autonomously. It lacks voltage feedback, error amplification, and PWM oscillator independence. All critical control signals-including ITH (current command), RUN (enable), SYNC (clock), and FAULT (protection)-must be supplied by a compatible master controller such as the LTC3884, LTC3866, or LTC3875. Attempting standalone operation results in undefined behavior and no regulated output.
What are the absolute maximum ratings for the TG0 and BG0 pins on the LTC3874EUFD#TRPBF?
The absolute maximum ratings for TG0 and BG0 are defined by their voltage relationships: TG0 and BG0 each tolerate −0.3V to INTVCC (max 6V) referenced to GND. Critically, the differential voltage (BOOST0 − SW0) must remain within −0.3V to +6V, and SW0 itself must stay between −5V and VIN (max 40V). Exceeding these limits risks permanent damage to the gate driver stages-proper bootstrap capacitor sizing and Schottky diode selection are mandatory for reliable operation.
How does phase shift programming via the PHASMD pin impact system-level performance in the LTC3874EUFD#TRPBF?
The PHASMD pin sets precise phase offsets (0°, 60°, 120°, 180°, 240°, 270°, 300°, or 360°) between the LTC3874EUFD#TRPBF's two channels and the external SYNC clock-directly reducing input capacitor RMS current. For example, in a 6-phase system with 60° interleaving, RMS input current drops by √6 compared to single-phase operation, allowing up to 75% smaller input capacitance while maintaining identical ripple and thermal performance.
LTC3874EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 250kHz ~ 1MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Phase Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3874EUFD#TRPBF FAQ
1.How can I place an order for LTC3874EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3874EUFD#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3874EUFD#TRPBF reliable?
The price and inventory of LTC3874EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3874EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3874EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3874EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3874EUFD#TRPBF?
LTC3874EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3874EUFD#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3874EUFD#TRPBF?
For technical support, including LTC3874EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3874EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3874EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3874EUFD#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3874EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3874EUFD#TRPBF?
All LTC3874EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3874EUFD#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3874EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3874EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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