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Analog Devices Inc. LTC3774EUHE#TRPBF
- Part No.:
- LTC3774EUHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-WFQFN Exposed Pad
- Datasheet:
-
LTC3774EUHE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,611
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Product details
Overview
LTC3774EUHE#TRPBF from Analog Devices is a dual-phase, polyphase current-mode synchronous step-down controller designed for high-current DC/DC conversion with sub-milliohm DCR sensing. It supports 0.6V–3.5V output voltage from 4.5V–38V input, delivers up to 60A per phase in multiphase configurations, and features programmable current sense threshold (10mV–30mV), ±0.75% total DC output error over temperature, and phase-lockable 200kHz–1.2MHz operation.
For engineers reviewing the LTC3774EUHE#TRPBF datasheet, LTC3774EUHE#TRPBF pinout, LTC3774EUHE#TRPBF application, or LTC3774EUHE#TRPBF equivalent, key selection criteria include DCR temperature compensation capability, dual differential remote sensing, hiccup-mode overcurrent recovery, support for phase shedding/N+1 redundancy, and compatibility with power blocks, DrMOS, or discrete MOSFETs in telecom and server power systems.
Technical Context
The LTC3774EUHE#TRPBF implements a proprietary dual-channel current-mode architecture with independent SNSA+/SNSD+ AC/DC current sense inputs per phase, enabling stable regulation using inductors with DCR as low as 0.2mΩ. Its transconductance error amplifier (gm = 2 mmho) and 4 MHz unity-gain crossover frequency ensure fast transient response while maintaining stability across wide load and line variations.
Each channel integrates dedicated ITH control nodes, TK/SS soft-start/tracking inputs, HIZB phase-shedding controls, and PGOOD open-drain indicators. The device supports synchronized multiphase operation via CLKOUT and MODE/PLLIN pins, with configurable CH1–CH2 phase delays (120°–180°) and CH1–CLKOUT offsets (45°–240°) determined by PHSMD voltage level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 38V - supports wide-input industrial and telecom power rails without pre-regulation. |
| VOUT Range | 0.6V to 3.5V - covers core voltages for CPUs, FPGAs, and ASICs with tight regulation. |
| Current Sense Threshold | Programmable 10mV–30mV in 5mV steps - enables accurate peak-current limiting with ultra-low-DCR inductors. |
| Switching Frequency | 200kHz–1.2MHz - adjustable via external resistor on FREQ pin; supports optimization of efficiency vs. size trade-offs. |
| Total DC Output Error | ±0.75% over –40°C to 125°C - ensures stable output under thermal stress without recalibration. |
| Remote Sense Accuracy | Dual differential amplifiers with ±100nA bias current - minimizes voltage drop errors in high-current PCB traces. |
| Operating Junction Temp | –40°C to 125°C - qualified for harsh environments including base station power supplies and industrial controllers. |
Pinout & Package
The LTC3774EUHE#TRPBF is housed in a thermally enhanced 36-lead (5mm × 6mm) plastic QFN package with exposed pad (Pin 37) soldered to PCB ground for electrical integrity and thermal dissipation (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 | Error amplifier output / current comparator threshold | Directly sets peak inductor current per phase; used for loop compensation and current limit programming. |
| VOSNS1+, VOSNS2+ | Non-inverting remote sense inputs | Connect to feedback divider midpoint at load; enable precise regulation despite PCB IR drop. |
| SNSA1+, SNSA2+ | AC current sense comparator (+) inputs | Acquire high-frequency inductor ripple for accurate current mode control with noise rejection. |
| SNSD1+, SNSD2+ | DC current sense comparator (+) inputs | Measure average inductor current via DCR; bandwidth matched to L/DCR for stable sensing. |
| HIZB1, HIZB2 | Phase shedding control inputs | Pull low to disable corresponding PWM output and reduce phase count under light load for efficiency. |
| PHSMD | Phase mode selection | Voltage level (GND/INTVCC/1/4/3/4 INTVCC/floating) configures CH1–CH2 and CH1–CLKOUT phase relationships. |
| FREQ | Frequency set pin | Sources 20µA; resistor to GND programs switching frequency from 200kHz to 1.2MHz. |
| MODE/PLLIN | Mode selection / PLL sync input | Selects Burst Mode (float), pulse-skipping (INTVCC), or forced CCM (GND); accepts external clock for synchronization. |
| CLKOUT | Clock output | Drives MODE/PLLIN of downstream LTC3774s to daisy-chain up to 12-phase systems. |
| TK/SS1, TK/SS2 | Soft-start / tracking inputs | Internal 1.25µA pull-up charges external capacitor for controlled ramp-up or supply tracking. |
| ITEMP1, ITEMP2 | DCR temperature compensation inputs | Connect to NTC thermistors near inductors to compensate for DCR drift with temperature. |
| ILIM1, ILIM2 | Current sense threshold select | Set maximum sense voltage (10–30mV) in 5mV steps via voltage division from INTVCC. |
| PWM1, PWM2 | Top gate drive outputs | Three-state compatible signals for driving external gate drivers or integrated DrMOS power stages. |
| PWMEN1, PWMEN2 | Enable outputs for non-three-state drivers | Open-drain outputs pulled up to INTVCC; go low when corresponding PWM is high-impedance. |
| PGOOD1, PGOOD2 | Power good indicators | Open-drain outputs asserting when respective VOUT is within ±7.5% of target voltage. |
| RUN1, RUN2 | Channel enable inputs | 1.22V threshold with 1µA pull-up; release to enable startup sequence with internal soft-start. |
| VIN | Main input supply | Primary power source for internal circuitry and gate drivers; requires local 0.1–1µF decoupling. |
| INTVCC | Internal 5.5V regulator output | Supplies control logic; must be decoupled with ≥4.7µF low-ESR capacitor; not for external loads. |
| GND (Pins 10,19,37) | Signal and power ground | Exposed pad (Pin 37) must be soldered to PCB ground plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-milliohm DCR sensing | Enables use of 0.2mΩ–1mΩ inductors with 14dB SNR improvement, reducing conduction loss and thermal stress. |
| Dual differential remote sensing | Compensates for up to 100mV IR drop in high-current PCB traces, maintaining ±0.75% output accuracy at load. |
| Programmable DCR temperature compensation | Uses external NTC thermistors on ITEMP pins to correct for inductor DCR drift across –40°C to 125°C. |
| Phase-shedding and N+1 redundancy | HIZB inputs allow dynamic phase reduction under light load; multiple controllers support fault-tolerant parallel operation. |
| Smooth start-up into pre-biased outputs | Bottom MOSFET disabled until TK/SS > VOSNS+, preventing reverse current and output discharge during hot-swap events. |
| Multi-phase synchronization | CLKOUT and MODE/PLLIN support daisy-chained 1-, 2-, 3-, 4-, 6-, 8-, or 12-phase systems with precise phase alignment. |
Applications
| Server CPU Core Power | Telecom Base Station PSU |
|---|---|
Use Scenario: High-current, low-voltage regulation for multi-core processors in rack-mounted servers requiring rapid transient response and thermal resilience. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing two independent 30A+ power trains with coordinated phase timing and current sharing. Use Value: Achieves >90% efficiency at 60A/1.5V with sub-milliohm DCR sensing, minimizing heat generation and enabling compact VRM designs. | Use Scenario: Distributed power delivery in 48V intermediate bus architectures for wireless infrastructure equipment operating in outdoor enclosures. IC Role / Device Role / Timing Role: Primary controller in multiphase front-end converters, synchronizing up to six LTC3774 units for 12-phase 120A output with reduced input ripple. Use Value: ±0.75% DC accuracy and –40°C to 125°C operation ensure stable 1.2V/3.3V rails despite ambient temperature swings and load transients. |
| Industrial PLC Power Module | Data Center GPU Voltage Regulator |
Use Scenario: Reliable, long-lifetime power for programmable logic controllers deployed in factory automation with variable input voltage and EMI constraints. IC Role / Device Role / Timing Role: Dual-channel controller supporting phase shedding (HIZB) and hiccup-mode overcurrent protection to maintain uptime during short-circuit faults. Use Value: Soft recovery from overcurrent events prevents system reset; programmable soft-start avoids inrush current damage to downstream FPGA I/O banks. | Use Scenario: High-density, high-efficiency voltage regulation for AI accelerators requiring tightly regulated 0.8V–1.2V rails with minimal voltage droop during burst workloads. IC Role / Device Role / Timing Role: Multiphase controller implementing tracking (TK/SS) and precise remote sensing to match GPU core/memory rail sequencing requirements. Use Value: Dual differential sense amplifiers and 600µs internal soft-start ensure <1% tracking error and <50mV droop during 100A/µs load steps. |
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 |
|---|---|---|---|
| MP8770GQ-Z | Single-channel controller with integrated 60A MOSFETs; no DCR temperature compensation; fixed 0.6V reference only. | Targeted at space-constrained single-rail applications; lacks multiphase synchronization and remote sensing flexibility. | Select when board area is critical and DCR drift compensation is unnecessary; not suitable for >40A or precision multi-rail systems. |
| ISL95812IRZ-T | Intel-compatible dual-phase controller with SMBus interface; supports only 0.5V–1.5V output; no programmable current sense threshold. | Designed for client CPU VRMs; lacks wide VIN range and phase-shedding control for industrial use cases. | Choose for Intel platform compliance and telemetry; avoid where 4.5V–38V input or sub-milliohm DCR sensing is required. |
Compared with MP8770GQ-Z and ISL95812IRZ-T, the LTC3774EUHE#TRPBF uniquely combines wide input/output ranges, programmable DCR sensing, dual remote sensing, and scalable multiphase synchronization-making it optimal for high-reliability, high-current industrial and telecom power systems where thermal stability and layout flexibility are critical.
Availability
LTC3774EUHE#TRPBF is available at Aetrix Electronics and suitable for server CPU core power, telecom base station PSUs, and industrial PLC power modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3774EUHE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3774EUHE#TRPBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, high-current DC/DC conversion in datacenter, telecom, and industrial infrastructure where precision DCR sensing and multiphase scalability are essential.
FAQ
What is the maximum supported switching frequency for the LTC3774EUHE#TRPBF?
The LTC3774EUHE#TRPBF supports a maximum switching frequency of 1.2MHz, programmable via an external resistor connected between the FREQ pin and ground. This upper limit is maintained across the full operating temperature range (–40°C to 125°C) and input voltage range (4.5V to 38V), enabling optimized trade-offs between efficiency and magnetics size in high-density power designs.
Does the LTC3774EUHE#TRPBF support operation with inductors having DCR below 1mΩ?
Yes, the LTC3774EUHE#TRPBF is explicitly designed for sub-milliohm DCR sensing, supporting inductors down to 0.2mΩ with proper PCB layout. Its dual-path sense architecture (SNSA+ for AC, SNSD+ for DC) provides 14dB improved signal-to-noise ratio, allowing accurate current measurement and stable regulation even with ultra-low-DCR components.
How does the LTC3774EUHE#TRPBF implement DCR temperature compensation?
The LTC3774EUHE#TRPBF uses the ITEMP1 and ITEMP2 pins to accept voltage from external NTC thermistors placed near the output inductors. These inputs feed a dedicated compensation circuit that adjusts the current sense gain to counteract DCR drift with temperature, ensuring consistent current limit accuracy across –40°C to 125°C without requiring calibration.
Can the LTC3774EUHE#TRPBF be used in single-phase configurations?
Yes, the LTC3774EUHE#TRPBF can operate in single-phase mode by configuring only one channel (e.g., disabling CH2 via RUN2 or HIZB2) while retaining full functionality of the active channel-including DCR sensing, remote voltage sense, and soft-start. Its dual-channel architecture allows flexible deployment from 1- to 12-phase systems.
What is the purpose of the PHSMD pin on the LTC3774EUHE#TRPBF?
The PHSMD pin on the LTC3774EUHE#TRPBF selects phase relationships between channels and clock outputs: grounding sets 120° CH1–CH2 / 240° CH1–CLKOUT; tying to INTVCC gives 180° / 60°; floating yields 180° / 90°; and applying 1/4 or 3/4 INTVCC achieves 180° / 60° or 180° / 45°, respectively-enabling precise multiphase interleaving.
LTC3774EUHE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 36-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- PWM Signal
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 150kHz ~ 1.2MHz
- Duty Cycle (Max):
- 98%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LTC3774EUHE#TRPBF FAQ
1.How can I place an order for LTC3774EUHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3774EUHE#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 LTC3774EUHE#TRPBF reliable?
The price and inventory of LTC3774EUHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3774EUHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3774EUHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3774EUHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3774EUHE#TRPBF?
LTC3774EUHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3774EUHE#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 LTC3774EUHE#TRPBF?
For technical support, including LTC3774EUHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3774EUHE#TRPBF requirements.
6.How does Aetrix verify that LTC3774EUHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3774EUHE#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 LTC3774EUHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3774EUHE#TRPBF?
All LTC3774EUHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3774EUHE#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 LTC3774EUHE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3774EUHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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