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Analog Devices Inc. LTC3877EUK#TRPBF
- Part No.:
- LTC3877EUK#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 44-WFQFN Exposed Pad
- Datasheet:
-
LTC3877EUK#TRPBF.pdf
- Description:
- IC REG CTRL 6 BIT VID 2OUT 44QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,519
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Product details
Overview
LTC3877EUK#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, constant-frequency, current-mode synchronous step-down controller with VID voltage programming and ultra-low-value DCR current sensing. It supports 4.5V–38V input, delivers up to 60A per phase, achieves 40ns minimum on-time, and features dual differential remote sensing for ±1% total output regulation accuracy over temperature.
For engineers reviewing the LTC3877EUK#TRPBF datasheet, LTC3877EUK#TRPBF pinout, LTC3877EUK#TRPBF application, or LTC3877EUK#TRPBF equivalent, key selection considerations include its 44-lead 7mm × 7mm QFN package, VID-enabled 0.6V–1.23V output programming in 10mV steps, dual-phase interleaved operation up to 12 phases, and integrated DCR temperature compensation for high-current server and FPGA power delivery.
Technical Context
The LTC3877EUK#TRPBF implements a proprietary current-sense architecture that amplifies low-amplitude DCR signals by 5× via SNSD+/SNSA+ pairing, enabling accurate sensing with sub-0.5mΩ inductors. Its dual error amplifiers (EA1/EA2) drive ITH1/ITH2 nodes to control peak current, while independent VID logic and CHL_SEL configuration support both dual-output and dual-phase single-output modes.
Phase alignment is programmable via PHASMD (0°/180°/240°), and frequency synchronization is supported through MODE/PLLIN with 250kHz–1MHz lock range. The controller integrates dedicated foldback current limiting, output overvoltage protection, and dual PGOOD monitors with 50µs delay and 235µs blanking during VID transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide-input industrial and server rails without external pre-regulation. |
| Output Voltage Range (VID) | 0.6V to 1.23V in 10mV steps - enables precise core voltage scaling for Intel/AMD processors and FPGAs. |
| Min On-Time | 40ns - allows high-frequency operation (up to 1MHz) at high step-down ratios (e.g., 12V→0.9V @ 400kHz). |
| Current Mismatch | ≤5% between channels - ensures tight current sharing in dual-phase configurations without external balancers. |
| Reference Accuracy | ±0.5% over –40°C to 125°C - guarantees stable regulation across full industrial temperature range. |
| DCR Temp Compensation | Programmable via ITEMP pin - corrects inductor resistance drift using NTC network, critical for stable current limit over temperature. |
| Max Switching Frequency | 1MHz - enables compact magnetics and reduced output capacitance in space-constrained applications. |
Pinout & Package
Package: 44-lead 7mm × 7mm plastic QFN (UK package) with exposed SGND/PGND pad (Pin 45) requiring PCB soldering for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SNSA1+, SNSA2+ | AC current sense comparator (+) inputs | Accept amplified ripple voltage from DCR network; enable low-noise sensing with 5× gain when paired with SNSD+. |
| SNSD1+, SNSD2+ | DC current sense comparator (+) inputs | Set current limit threshold level; grounding increases limit by 5× for high-current applications. |
| VOSNS1+, VOSNS1– | Channel 1 remote sense differential inputs | Connect directly to load point to eliminate PCB IR drop; feed DIFFOUT for closed-loop compensation. |
| VID0–VID5, VID_EN | Digital voltage identification interface | 6-bit parallel bus + enable pin; programs output voltage only after VID_EN assertion, preventing spurious startup transients. |
| CHL_SEL | Channel configuration control | High = dual-phase single-output mode; low = independent dual-output mode - determines VID applicability and current sharing behavior. |
| PHASMD | Phase offset programming pin | Tied to SGND/INTVCC/floating to select 180°/240°/0° relative phase shift - essential for multi-controller PolyPhase systems. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low DCR sensing | Supports inductors with DCR as low as 0.32mΩ while maintaining <5% current mismatch - maximizes efficiency in >50A applications. |
| Dual differential remote sensing | Independent VOSNS1+/VOSNS1– and VFB2+/VFB2– paths eliminate board-level voltage drop errors - ensures ±1% regulation at point-of-load. |
| Programmable current limit | ILIM pin selects one of five current sense thresholds (9–31.5mV) - enables precise overcurrent protection scaling across load conditions. |
| Multi-phase expandability | CLKOUT and PHASMD support up to 12-phase operation with multiple LTC3877EUK#TRPBF - reduces input/output ripple and thermal stress in high-power systems. |
| VID transient immunity | 235µs PGOOD blanking window during VID changes - prevents false power-good faults during dynamic voltage scaling sequences. |
Applications
| Processor Core Power Supply | FPGA/ASIC Dynamic Voltage Scaling |
|---|---|
Use Scenario: Delivering tightly regulated 0.6V–1.23V to high-performance CPU/GPU cores with rapid load transients up to 60A/phase. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing gate drivers (TG1/BG1, TG2/BG2), current sensing (SNSA1+/SNS1–), and VID decoding. Use Value: 40ns min-on-time and 1MHz max frequency enable fast transient response; ±0.5% reference accuracy ensures compliance with JEDEC core voltage tolerances. | Use Scenario: Supporting Xilinx/Intel FPGA VCCINT rails requiring real-time voltage adjustment during configuration or partial reconfiguration. IC Role / Device Role / Timing Role: VID-programmable step-down controller interpreting 6-bit digital codes to set output voltage, with PGOOD blanking synchronized to VID transitions. Use Value: 10mV VID steps and 235µs blanking guarantee glitch-free voltage slewing; dual remote sensing maintains regulation accuracy despite PCB trace impedance. |
| Server VR13/VR14 Compliant PSU | High-Density Telecom Power Module |
Use Scenario: Implementing dual-phase, single-output 0.9V/60A supply meeting Intel VR13/VR14 specifications for rack-mounted servers. IC Role / Device Role / Timing Role: PolyPhase controller configured via CHL_SEL=high, using CLKOUT and PHASMD for phase interleaving across multiple controllers. Use Value: ≤5% channel current mismatch and integrated DCR temperature compensation ensure stable current sharing across temperature and load - critical for VR14 compliance. | Use Scenario: Building compact 48V-to-12V intermediate bus converter in telecom line cards where board area and thermal density are constrained. IC Role / Device Role / Timing Role: High-frequency (625kHz typical) dual-phase controller minimizing inductor size; EXTVCC support enables efficient 48V biasing without linear regulator loss. Use Value: 44-lead QFN package and 1MHz capability reduce solution footprint by >30% vs legacy controllers; INTVCC/EXTVCC switchover improves light-load efficiency. |
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 |
|---|---|---|---|
| ISL95812IRZ-T | Fixed 600kHz switching frequency; no VID interface; supports only analog VREF programming. | Targeted at fixed-voltage GPU/ASIC supplies; lacks dynamic voltage scaling capability. | Select when VID functionality is unnecessary and cost sensitivity outweighs programmability needs. |
| MP8765GL-Z | Single-channel controller; supports up to 70A with external driver; no integrated DCR temp compensation. | Requires external phase-interleaving circuitry for multi-phase; limited to single-output topologies. | Choose for simpler, lower-cost single-phase designs where thermal management permits higher per-phase current. |
Compared with ISL95812IRZ-T and MP8765GL-Z, the LTC3877EUK#TRPBF uniquely combines VID programmability, dual-phase integration, DCR temperature compensation, and 40ns min-on-time - making it the only option among the three qualified for VR14-compliant, thermally demanding, dynamically scaled processor supplies.
Availability
LTC3877EUK#TRPBF is available at Aetrix Electronics and suitable for server power delivery, FPGA core voltage regulation, and high-density telecom power modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LTC3877EUK#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 full product support, documentation, and manufacturing continuity for all Linear ICs including the LTC3877 series.
The LTC3877 belongs to Linear's high-performance power controller family, designed specifically for high-efficiency, multi-phase DC/DC conversion in computing, datacenter, and industrial applications demanding precision regulation and dynamic voltage scaling.
FAQ
What is the operating temperature range for the LTC3877EUK#TRPBF?
The LTC3877EUK#TRPBF is specified for operation from –40°C to 125°C junction temperature. The "E" grade suffix denotes qualification across this full industrial range, with guaranteed performance including ±0.5% reference accuracy and ≤5% channel current mismatch within these limits. Thermal design must account for θJA = 34°C/W and mandatory soldering of the exposed PGND pad (Pin 45) to maintain reliability.
How does the LTC3877EUK#TRPBF implement DCR temperature compensation?
The LTC3877EUK#TRPBF uses the ITEMP pin to accept a voltage from an external NTC thermistor network placed near the power inductors. When CHL_SEL is high, this signal compensates both channels' current limits; when low, only Channel 1 is compensated. The internal circuitry converts the ITEMP voltage into a proportional current (29–31μA) that adjusts the DCR sense gain, counteracting inductor resistance drift over temperature - ensuring stable current limiting without external calibration.
Can the LTC3877EUK#TRPBF operate in single-phase mode?
Yes, the LTC3877EUK#TRPBF can operate in single-phase mode by grounding CHL_SEL and disabling one channel via its RUN pin or by configuring only one feedback loop. However, its architecture is optimized for dual-phase operation: the minimum on-time (40ns), current mismatch spec (≤5%), and integrated phase control (PHASMD, CLKOUT) deliver maximum benefit only when both phases are active and interleaved.
What is the purpose of the SNSD+ pins on the LTC3877EUK#TRPBF?
The SNSD1+ and SNSD2+ pins on the LTC3877EUK#TRPBF serve as DC current sense comparator inputs that scale the current limit threshold. When grounded, they increase the effective current sense threshold by 5× - allowing use of very low DCR inductors while maintaining sufficient noise margin. This feature is essential for achieving high efficiency in >50A applications where traditional RSENSE solutions introduce unacceptable conduction losses.
Does the LTC3877EUK#TRPBF support external clock synchronization?
Yes, the LTC3877EUK#TRPBF supports external clock synchronization via the MODE/PLLIN pin. Applying a clean square wave within 250kHz–1MHz to this pin forces the internal oscillator into continuous conduction mode and locks its phase to the external source. The integrated PLL compensation eliminates need for external loop filters, and PHASMD pin allows precise control of output phase relationship relative to the sync signal - critical for deterministic timing in multi-rail systems.
LTC3877EUK#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller, 6-bit VID
- Voltage - Input:
- 4.5V ~ 38V
- Number of Outputs:
- 2
- Voltage - Output:
- 0.6V ~ 3.5V, 0.6V ~ 5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-QFN (7x7)
LTC3877EUK#TRPBF FAQ
1.How can I place an order for LTC3877EUK#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3877EUK#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 LTC3877EUK#TRPBF reliable?
The price and inventory of LTC3877EUK#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3877EUK#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3877EUK#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3877EUK#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3877EUK#TRPBF?
LTC3877EUK#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3877EUK#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 LTC3877EUK#TRPBF?
For technical support, including LTC3877EUK#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3877EUK#TRPBF requirements.
6.How does Aetrix verify that LTC3877EUK#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3877EUK#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 LTC3877EUK#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3877EUK#TRPBF?
All LTC3877EUK#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3877EUK#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 LTC3877EUK#TRPBF part is unused and in its original packaging.
Return procedure for LTC3877EUK#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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