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Analog Devices Inc. LTC3875EUH#TRPBF
- Part No.:
- LTC3875EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3875EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,249
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Product details
Overview
LTC3875EUH#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 low-DCR inductor sensing (down to 0.32mΩ), ±0.5% 0.6V reference accuracy, and programmable current sense thresholds from 10mV to 30mV - delivering high-efficiency 1.2V/60A conversion for server VRMs.
For engineers reviewing the LTC3875EUH#TRPBF datasheet, LTC3875EUH#TRPBF pinout, LTC3875EUH#TRPBF application, or LTC3875EUH#TRPBF equivalent, key selection criteria include dual-phase thermal balancing, DCR temperature compensation, remote differential sensing, and phase-lockable 250kHz–720kHz operation with CLKOUT synchronization for multi-phase scaling.
Technical Context
The LTC3875EUH#TRPBF implements current-mode control with two independent error amplifiers and dual high-speed remote-sense differential amplifiers (VOSNS1+/–, VOSNS2+/–), each referenced to 0.6V ±0.5%. Its unique architecture enhances current-sense SNR by separating AC (SNSA+/–) and DC (SNSD+/–) sensing paths, enabling precise low-DCR inductor monitoring with foldback current limiting.
It supports flexible timing via FREQ pin (10µA sink, 220–790kHz range), PHASMD-selectable output phasing (60°/90°/120°), and MODE/PLLIN for forced CCM, Burst Mode, or external clock synchronization. Thermal balancing is implemented through TCOMP1/2, TRSET1/2, and TAVG pins with NTC-based DCR compensation or multichip current redistribution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide bus voltages including 12V, 24V, and 36V industrial/telecom rails. |
| Output Voltage Accuracy | ±0.5% at 0.6V reference - ensures tight regulation for sub-1.5V CPU/GPU core supplies. |
| Current Sense Threshold | Programmable 10mV–30mV (DC path) - enables accurate current limiting with ultra-low-DCR inductors (e.g., 0.32mΩ). |
| Switching Frequency Range | 250kHz–720kHz (FREQ-pin programmable) - balances efficiency vs. size; supports phase-locking across up to 12 phases. |
| Thermal Compensation | DCR temperature compensation via TCOMP1/2 pins - maintains consistent current limit over –40°C to 125°C junction range. |
| Remote Sensing | Dual true differential amplifiers (VOSNS1+/–, VOSNS2+/–) - rejects PCB IR drop for <1% load regulation at point-of-load. |
| Driver Strength | TG RDS(ON) = 2.6Ω (high), BG RDS(ON) = 1.1Ω (low) - drives high-side/lower-side N-MOSFETs with fast 25ns rise/fall times. |
Pinout & Package
Package: 40-lead (5mm × 5mm) plastic QFN, 0.4mm pitch, exposed pad (Pin 41) soldered to SGND/PGND for thermal and electrical integrity. θJA = 44°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TK/SS1, TK/SS2 (1, 8) | Soft-start & tracking input | 1.25µA internal current charges external capacitor for controlled voltage ramp; enables output voltage tracking between channels. |
| VOSNS1+, VOSNS2+ (2, 6) | Positive remote sense input | Connects to top of output divider; differential pair rejects common-mode noise for precision feedback. |
| VOSNS1–, VOSNS2– (3, 7) | Negative remote sense input | Connects to output capacitor negative terminal - completes Kelvin sensing loop for <1% load regulation. |
| ITH1, ITH2 (4, 5) | Error amplifier output / current threshold | Voltage sets peak inductor current; directly interfaces with compensation network for loop stability. |
| FREQ (15) | Frequency programming input | 10µA sink current; resistor to ground sets oscillator frequency from 220kHz to 790kHz. |
| MODE/PLLIN (33) | Mode selection & sync input | Selects CCM/Burst/Pulse-Skipping; accepts external clock for PLL synchronization across multiple controllers. |
| CLKOUT (31) | Phase-adjustable clock output | Drives downstream controllers; phase relative to Channel 1 set by PHASMD (GND/float/INTVCC). |
| TCOMP1/ITEMP1, TCOMP2/ITEMP2 (37, 12) | Temperature sensor input | Accepts NTC thermistor near inductor to compensate DCR drift or enable per-phase thermal balancing. |
| SGND/PGND (41) | Signal & power ground | Exposed pad must be soldered to PCB ground plane - critical for noise immunity, thermal dissipation, and gate driver return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 180°-phased control | Reduces input ripple current by ~70%, cutting required bulk capacitance and lowering EMI in high-current VRMs. |
| Low-DCR current sensing | Supports inductors as low as 0.32mΩ with 5× signal gain - eliminates sense resistors, improving efficiency and thermal performance. |
| DCR temperature compensation | Compensates inductor DCR drift over temperature using external NTC on TCOMP pins - maintains stable current limit from –40°C to 125°C. |
| Thermal balancing | Adjusts per-phase current via TAVG summation - equalizes thermal stress across paralleled LTC3875s or multi-chip single-output designs. |
| True remote differential sensing | Two independent differential amplifiers reject PCB trace resistance - achieves <0.5% load regulation at 60A output without local feedback errors. |
| Programmable fast transient response | IFAST pin (Channel 2 only) adjusts transient excursion threshold - improves dynamic response to sudden load steps in asymmetric multi-rail systems. |
Applications
| Server VRM | Telecom Power Shelf |
|---|---|
|
Use Scenario: Dual-output 1.2V/60A + 1.0V/30A core supply for dual-socket Xeon processors with strict transient response requirements. IC Role / Device Role / Timing Role: Primary 2-phase synchronous buck controller with thermal balancing across two ICs and remote sensing at CPU socket. Use Value: Enables >94% efficiency at full load using 0.32mΩ DCR inductors and eliminates discrete current sense resistors - reducing BOM cost and board area. |
Use Scenario: Distributed 3.3V/20A and 5V/15A intermediate bus converters in 48V telecom power shelves with hot-swap capability. IC Role / Device Role / Timing Role: Dual-channel controller managing independent outputs with programmable soft-start sequencing and PGOOD monitoring. Use Value: Independent RUN1/RUN2 control allows staggered startup and fault isolation; wide 4.5V–38V input accommodates brownout and hold-up conditions. |
| Industrial PLC Power | Test Equipment DC Supply |
|
Use Scenario: High-reliability 24V-to-3.3V/5V dual-rail converter for programmable logic controllers operating in –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Dual-phase controller with DCR temperature compensation and ±0.5% reference accuracy over full temp range. Use Value: Maintains precise current limit and output regulation despite inductor DCR drift - eliminating calibration drift in long-life embedded systems. |
Use Scenario: Programmable bench power supply with adjustable 0.6V–3.5V output and 60A max current, requiring low-noise, low-ripple performance. IC Role / Device Role / Timing Role: Precision-controlled buck controller with differential remote sensing and selectable CCM/Burst modes. Use Value: Achieves <10mVpp output ripple (Figure 20) and <0.1% line/load regulation - meeting lab-grade power integrity specs. |
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 |
|---|---|---|---|
| LTC3873EUH#TRPBF | Single-output, no thermal balancing or TAVG/TCOMP pins; identical pinout except missing TRSET/TCOMP/TAVG/ENTMPB functions. | Suitable for simpler dual-rail systems where per-phase thermal management is unnecessary. | Select when only one regulated output is needed and DCR temperature compensation is not required. |
| ISL95812IRZ-T | Integrated dual-phase controller with MOSFET drivers but no DCR temperature compensation; fixed 500kHz frequency; no CLKOUT or PHASMD. | Targets notebook VRMs with lower current (<40A) and less stringent thermal balancing needs. | Choose for cost-sensitive consumer applications where external NTC compensation and multi-phase scalability are not needed. |
Compared with LTC3875EUH#TRPBF, LTC3873EUH#TRPBF reduces feature set for single-output use, while ISL95812IRZ-T trades configurability for integration and lower system cost - making LTC3875EUH#TRPBF optimal for thermally constrained, high-current industrial/server designs requiring DCR compensation and scalable multiphase operation.
Availability
LTC3875EUH#TRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom power shelves, and industrial PLC power supplies requiring stable component supply, extended temperature support (–40°C to 125°C), and long-term lifecycle continuity.
Supply support for LTC3875EUH#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, emphasizing precision, efficiency, and reliability for demanding analog-intensive applications.
The LTC3875EUH#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, low-DCR sensing, and phase synchronization are critical.
FAQ
What is the package type and thermal performance of the LTC3875EUH#TRPBF?
The LTC3875EUH#TRPBF uses a 40-lead 5mm × 5mm plastic QFN package with 0.4mm pitch and an exposed thermal pad (Pin 41). Its thermal resistance is θJA = 44°C/W and θJC = 7.3°C/W. The exposed pad must be soldered to a solid SGND/PGND plane to ensure proper heat dissipation and noise immunity - critical for stable operation at 60A output currents.
How does the LTC3875EUH#TRPBF implement DCR temperature compensation?
The LTC3875EUH#TRPBF uses TCOMP1/2 pins to interface with external NTC thermistors placed near the output inductors. These pins convert thermistor resistance changes into proportional currents mirrored to TAVG, dynamically adjusting the current sense threshold to counteract DCR drift. This ensures consistent current limiting across –40°C to 125°C without calibration - a key capability confirmed in the Electrical Characteristics table (ITCOMP1,2 = 29–31µA).
Can the LTC3875EUH#TRPBF operate with only one output enabled?
Yes, the LTC3875EUH#TRPBF supports independent channel control via RUN1 and RUN2 pins. Pulling either pin below 1.14V disables that channel's control loop while leaving the other active. Both channels can be operated simultaneously or individually - verified in the Shutdown and Start-Up section and Absolute Maximum Ratings (RUN1/RUN2 thresholds specified separately).
What is the purpose of the SNSA+ and SNSD+ pins on the LTC3875EUH#TRPBF?
SNSA+ (AC sense) and SNSD+ (DC sense) pins enable split-path current sensing: SNSA+ captures inductor ripple voltage for fast transient response, while SNSD+ monitors average current for precise DC regulation. When used together with SNS–, they allow 5× gain for low-DCR networks - a documented function in the Features list ("Low Value DCR Sensing") and Pin Functions description.
Does the LTC3875EUH#TRPBF support external clock synchronization?
Yes, the LTC3875EUH#TRPBF supports external synchronization via the MODE/PLLIN pin. Applying a clock signal to this pin forces continuous conduction mode and locks the internal oscillator phase - enabling precise timing alignment across multiple LTC3875EUH#TRPBF controllers in 6-, 9-, or 12-phase configurations, as stated in the Features list and Operation section.
LTC3875EUH#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 (5x5)
LTC3875EUH#TRPBF FAQ
1.How can I place an order for LTC3875EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3875EUH#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 LTC3875EUH#TRPBF reliable?
The price and inventory of LTC3875EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3875EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3875EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3875EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3875EUH#TRPBF?
LTC3875EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3875EUH#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 LTC3875EUH#TRPBF?
For technical support, including LTC3875EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3875EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3875EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3875EUH#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 LTC3875EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3875EUH#TRPBF?
All LTC3875EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3875EUH#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 LTC3875EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3875EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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