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Analog Devices Inc. LTC3875EUJ#TRPBF
- Part No.:
- LTC3875EUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3875EUJ#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,822
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Product details
Overview
LTC3875EUJ#TRPBF from Analog Devices (formerly Linear Technology) is a dual-output, 2-phase synchronous step-down DC/DC controller driving all-N-channel MOSFET stages. It enables high-efficiency, high-current regulation (e.g., 1.2V/60A) using low-DCR inductor sensing with ±0.5% 0.6V reference accuracy, 4.5V–38V input range, and DCR temperature compensation across –40°C to 125°C.
For engineers reviewing the LTC3875EUJ#TRPBF datasheet, LTC3875EUJ#TRPBF pinout, LTC3875EUJ#TRPBF application, or LTC3875EUJ#TRPBF equivalent, key selection criteria include dual-phase thermal balancing, programmable current sense threshold (10–30mV), phase-lockable 250–720kHz operation, remote differential sensing, and support for low-DCR current sensing in server power delivery and telecom DC distribution systems.
Technical Context
The LTC3875EUJ#TRPBF implements current-mode control with two independent error amplifiers and dual high-speed remote-sense differential amplifiers-each with dedicated VOSNS+/VOSNS– inputs-enabling precise output voltage regulation under load transients. Its unique architecture enhances current-sense signal-to-noise ratio for low-DCR inductors, reducing switching jitter and enabling accurate foldback current limiting.
It supports flexible timing configuration via FREQ pin (10µA sink), PHASMD-selectable CLKOUT phase (60°/90°/120°), and MODE/PLLIN for forced CCM, Burst Mode, or external synchronization. Thermal balancing is implemented through TCOMP1/2, TRSET1/2, and TAVG pins, allowing per-phase current adjustment to minimize thermal stress in multichip single-output designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide bus voltages including 5V, 12V, 24V, and 36V industrial/telecom rails. |
| Output Voltage Accuracy | ±0.5% at 0.6V reference - ensures tight regulation for sub-1V CPU/GPU core supplies. |
| Current Sense Threshold | Programmable 10mV to 30mV - enables use of ultra-low-DCR (e.g., 0.32mΩ) inductors without external sense resistors. |
| Switching Frequency Range | 250kHz to 720kHz - adjustable via FREQ pin resistor; supports phase-locking up to 12-phase systems. |
| Operating Temperature | –40°C to +125°C junction - qualified for industrial and telecom base station environments. |
| Package | 40-lead 6mm × 6mm QFN (UJ) - exposed pad (Pin 41) must be soldered to PGND for thermal and electrical integrity. |
| Remote Sensing | Dual true differential amplifiers (VOSNS1±, VOSNS2±) - rejects PCB trace IR drop for accurate point-of-load regulation. |
Pinout & Package
Package: 40-lead (6mm × 6mm) plastic QFN with 0.5mm pitch; exposed thermal pad (Pin 41) is SGND/PGND and must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TK/SS1 (Pin 1) | Channel 1 soft-start/tracking input | Internal 1.25µA current charges external capacitor to ramp output voltage; enables voltage tracking with master/slave configuration. |
| VOSNS1+ (Pin 2), VOSNS1– (Pin 3) | Channel 1 remote sense differential inputs | Connect across output divider to reject PCB resistance; enables <1% load regulation at point-of-load. |
| ITH1 (Pin 4) | Channel 1 error amplifier output / current limit threshold | Controls peak inductor current; voltage sets current comparator trip point (e.g., 1.2V = nominal full-scale). |
| SW1 (Pin 30), TG1 (Pin 29), BG1 (Pin 27), BOOST1 (Pin 28) | Channel 1 power stage interface | Drives N-channel top/bottom MOSFETs; BOOST1 supplies floating gate drive for TG1; SW1 connects to inductor node. |
| FREQ (Pin 15) | Oscillator frequency programming | 10µA sink current; resistor to ground sets frequency from 250kHz to 720kHz - critical for EMI tuning and multi-phase synchronization. |
| PHASMD (Pin 32) | Phase mode select | GND/float/INTVCC selects 180°/240°/120° relative phase between channels and CLKOUT phase alignment. |
| ENTMPB (Pin 18) | Thermal balancing enable | Ground to activate per-phase current redistribution based on TCOMP1/2 inputs - reduces hot-spot risk in paralleled ICs. |
| PGOOD (Pin 19) | Power-good indicator | Open-drain output asserts low if either channel's output deviates >±7.5% from setpoint after 20µs debounce. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 180°-phased controllers | Reduces input ripple current by ~70% vs single-phase, cutting required bulk capacitance and lowering EMI. |
| Low-DCR current sensing | Enables use of 0.32mΩ inductors with 10–30mV programmable threshold - eliminates sense resistor losses and board space. |
| DCR temperature compensation | TCOMP1/2 pins accept NTC thermistors near inductors to dynamically adjust current limit vs. temperature - maintains safe SOA. |
| Thermal balancing function | Adjusts per-phase current in multichip configurations using TAVG summation - equalizes thermal stress across parallel ICs. |
| Programmable fast transient response | IFAST pin (Ch2 only) sets load-step excursion threshold - improves dynamic response for CPU/GPU burst loads. |
Applications
| Server VRM Power Stage | Telecom DC Distribution |
|---|---|
|
Use Scenario: Dual 1.2V/60A output for CPU/GPU core supply in high-density rack servers. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing all-N-channel MOSFETs with interleaved timing and thermal balancing. Use Value: Achieves >94% efficiency at 60A using 0.32mΩ DCR inductors; reduces input capacitance and thermal derating vs. single-phase solutions. |
Use Scenario: 48V-to-12V/5V intermediate bus conversion in 5G base station power shelves. IC Role / Device Role / Timing Role: High-vin dual-output controller supporting wide input range (4.5V–38V) and remote sensing over long PCB traces. Use Value: Maintains ±0.5% output accuracy despite PCB IR drop; enables compact, high-power density designs with low-DCR magnetics. |
| Industrial PLC Power Module | Test Equipment DC Supply |
|
Use Scenario: Programmable 3.3V/5V dual-rail supply for FPGA and analog subsystems in ruggedized PLCs. IC Role / Device Role / Timing Role: Dual independent buck controller with independent RUN/soft-start and robust overvoltage/short-circuit protection. Use Value: Guaranteed –40°C to +125°C operation with thermal shutdown (160°C) and hysteresis (10°C) - meets industrial reliability requirements. |
Use Scenario: Precision, low-noise 1.8V/2.5V dual output for ADC/DAC reference and digital logic in automated test equipment. IC Role / Device Role / Timing Role: Dual remote-sense controller with ±0.5% reference accuracy and low output voltage ripple (<10mV p-p). Use Value: Delivers stable, low-noise rails essential for 16-bit+ data converters; differential sensing rejects noise from shared ground paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3876EUJ#TRPBF | Includes integrated MOSFET drivers with higher peak gate current (4A vs 2.5A); adds PMBus interface and telemetry. | Targeted at digitally controlled, telemetry-enabled systems requiring real-time current/voltage reporting. | Select when digital monitoring, fault logging, or adaptive loop tuning is required - not a pin-compatible replacement. |
| ISL9123IRZ-T7A | Single-output, single-phase controller; lower Vin range (2.5V–5.5V); no DCR sensing or thermal balancing. | Suitable for low-voltage portable applications (e.g., battery-powered SoCs), not for high-current server/industrial use. | Consider only for cost-sensitive, low-power single-rail designs - lacks dual-phase, thermal balance, and wide-Vin capability. |
Compared with LTC3876EUJ#TRPBF, the LTC3875EUJ#TRPBF offers simpler analog control and lower BOM cost but no digital interface; versus ISL9123IRZ-T7A, it delivers scalable high-current dual-phase performance with advanced thermal and sensing features essential for infrastructure power.
Availability
LTC3875EUJ#TRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom DC distribution systems, and industrial PLC power modules requiring stable component supply, extended temperature operation, and high-efficiency low-DCR power conversion.
Supply support for LTC3875EUJ#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive- and industrial-grade qualification.
The LTC3875EUJ#TRPBF belongs to Linear's PolyPhase® synchronous controller family, designed specifically for high-current, multi-phase DC/DC conversion in datacenter, telecom, and industrial infrastructure where thermal management and precision regulation are critical.
FAQ
What is the package type and thermal pad requirement for LTC3875EUJ#TRPBF?
The LTC3875EUJ#TRPBF uses a 40-lead 6mm × 6mm plastic QFN (UJ package) with 0.5mm pitch. Pin 41 is the exposed thermal pad, designated SGND/PGND. It must be soldered to a large PCB copper area connected to power ground to ensure proper thermal dissipation (θJA = 33°C/W) and low-impedance return path for high-frequency switching currents. Failure to solder this pad degrades thermal performance and may cause premature failure.
How does LTC3875EUJ#TRPBF achieve accurate current sensing without a sense resistor?
The LTC3875EUJ#TRPBF uses proprietary low-DCR current sensing by combining AC and DC components from the inductor's DCR network. SNSA+ and SNSD+ pins accept signals from a single RC network across the inductor; the internal circuitry amplifies the AC ripple by 5× while preserving DC offset, enabling precise current measurement down to 10mV threshold. This eliminates power loss and board space associated with discrete sense resistors.
Can LTC3875EUJ#TRPBF operate in single-channel mode?
Yes, LTC3875EUJ#TRPBF supports independent channel control. RUN1 and RUN2 pins allow individual enable/disable; TK/SS1 and TK/SS2 support separate soft-start or tracking; and ITH1/ITH2 provide independent current limit setting. Either channel can be disabled while the other operates normally - useful for asymmetric rail generation or redundancy schemes.
What is the purpose of the TAVG pin on LTC3875EUJ#TRPBF?
The TAVG pin on LTC3875EUJ#TRPBF serves as the average temperature summing node for thermal balancing. When ENTMPB is grounded, currents from all TCOMP/ITEMP pins (including those from multiple LTC3875EUJ#TRPBF ICs in parallel) are mirrored into TAVG. A resistor from TAVG to ground sets the summed reference, enabling automatic per-phase current redistribution to equalize thermal stress across paralleled power stages.
Does LTC3875EUJ#TRPBF support external clock synchronization?
Yes, LTC3875EUJ#TRPBF supports external synchronization via the MODE/PLLIN pin. Applying a clean clock signal (250–720kHz) to this pin forces continuous conduction mode and locks the internal oscillator to the external source with integrated PLL compensation. This enables deterministic phase alignment across multiple LTC3875EUJ#TRPBF devices in 6-, 9-, or 12-phase configurations without additional timing ICs.
LTC3875EUJ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-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 ~ 720kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LTC3875EUJ#TRPBF FAQ
1.How can I place an order for LTC3875EUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3875EUJ#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 LTC3875EUJ#TRPBF reliable?
The price and inventory of LTC3875EUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3875EUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3875EUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3875EUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3875EUJ#TRPBF?
LTC3875EUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3875EUJ#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 LTC3875EUJ#TRPBF?
For technical support, including LTC3875EUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3875EUJ#TRPBF requirements.
6.How does Aetrix verify that LTC3875EUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3875EUJ#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 LTC3875EUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3875EUJ#TRPBF?
All LTC3875EUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3875EUJ#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 LTC3875EUJ#TRPBF part is unused and in its original packaging.
Return procedure for LTC3875EUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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