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Analog Devices Inc. LTC3374HUHF#TRPBF
- Part No.:
- LTC3374HUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3374HUHF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,809
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Product details
Overview
LTC3374HUHF#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 8-channel synchronous buck DC/DC regulator IC with independent 1A per channel capability, 2.25V–5.5V input range per channel, 0.8V–VIN output range, and thermally enhanced 38-lead 5mm × 7mm QFN package rated for –40°C to 150°C junction temperature. It enables flexible multi-rail power delivery in space-constrained industrial and automotive control systems.
For engineers reviewing the LTC3374HUHF#TRPBF datasheet, LTC3374HUHF#TRPBF pinout, LTC3374HUHF#TRPBF application, or LTC3374HUHF#TRPBF equivalent, key selection considerations include per-channel enable precision (±40 mV hysteresis), programmable 1–3 MHz switching frequency, die temperature monitoring via TEMP pin (150 mV @ 25°C, 6.75 mV/°C slope), phased 90° switching to reduce input ripple, and master-slave parallel configuration support up to 4A per output.
Technical Context
The LTC3374HUHF#TRPBF integrates eight fully independent synchronous buck regulators, each with dedicated VIN, SW, FB, and EN pins, enabling true multi-supply rail generation from separate input sources. All channels share a common oscillator architecture-programmable via RT resistor, synchronizable via SYNC, or fixed at 2 MHz-and operate collectively in either Burst Mode (low IQ, light-load efficiency) or forced continuous mode (fixed-frequency, low-noise).
Its thermal management includes an on-die temperature sensor (TEMP pin) with ±2°C accuracy over –40°C to 125°C, overtemperature shutdown at 165°C with 10°C hysteresis, and a thermally optimized QFN package with exposed GND pad requiring PCB soldering for θJA = 34°C/W. Power sequencing is supported by precision enable thresholds (400–1200 mV rising, 60 mV hysteresis) and PGOOD_ALL open-drain status reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8 independent 1A synchronous buck regulators, configurable in master-slave groups up to 4A/output using shared inductors. |
| Input Voltage Range | 2.25V to 5.5V per channel-supports mixed-voltage system rails including 3.3V, 2.5V, and 1.8V logic domains. |
| Output Voltage Range | 0.8V to VIN-enables generation of sub-1V core supplies (e.g., 0.85V FPGA I/O) and standard logic rails without external bias. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable), 2MHz default, or externally synchronized-allows EMI optimization and inductor size reduction. |
| Enable Threshold Accuracy | Rising threshold: 400–1200 mV (all-off state); hysteresis: 60 mV-ensures robust, noise-immune power-up sequencing across temperature. |
| DIE Temperature Monitoring | TEMP pin outputs 150 mV @ 25°C with 6.75 mV/°C slope-provides direct, calibrated die temperature feedback for thermal margining and derating. |
| Package & Temp Grade | 38-lead 5mm × 7mm QFN (UHF), –40°C to 150°C operating junction temperature-qualified for under-hood automotive and high-temp industrial environments. |
Pinout & Package
Package: 38-lead plastic QFN (5mm × 7mm), exposed GND pad (Pin 39) requiring solder connection to PCB ground plane for thermal and electrical performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 (Pins 1,6,7,12,20,25,26,31) | Feedback input for buck regulators 1–8 | Resistor-divider node setting output voltage; shorting FBx to VINx configures master-slave parallel operation. |
| VIN1–VIN8 (Pins 2,5,8,11,21,24,27,30) | Independent input supply for each buck channel | Each accepts 2.25V–5.5V; bypass required with ≥10µF ceramic capacitor; supports mixed-input architectures. |
| SW1–SW8 (Pins 3,4,9,10,22,23,28,29) | Switch node for internal high-side/low-side MOSFETs | Connects to external inductor; phase-shifted 90° between adjacent channels to minimize input current ripple. |
| EN1–EN8 (Pins 38,37,14,13,19,18,33,32) | Active-high enable for each buck regulator | Threshold: 400–1200 mV rising edge; 60 mV hysteresis-enables precise, autonomous power sequencing without external controllers. |
| PGOOD_ALL (Pin 15) | Open-drain global power-good status | Asserts LOW if any enabled buck's output drops >7.5% below regulation-simplifies system-level fault detection and reset coordination. |
| TEMP (Pin 36) | Analog die temperature monitor output | 150 mV @ 25°C, 6.75 mV/°C slope-enables real-time thermal telemetry and closed-loop thermal management. |
| MODE (Pin 34) | Global operating mode select | LOW = Burst Mode (high efficiency at light loads); HIGH = forced continuous mode (low-noise, fixed-frequency PWM). |
| SYNC (Pin 16) | External clock synchronization input | Accepts 1–3 MHz square wave; automatically adjusts slope compensation-critical for EMI-sensitive or multi-IC synchronized systems. |
| RT (Pin 17) | Oscillator frequency programming node | Resistor-to-GND sets fSW (1–3 MHz); tie to VCC for 2 MHz default-eliminates need for external crystal or clock generator. |
| VCC (Pin 35) | Internal bias supply input | 2.7–5.5V input powering internal logic and gate drivers; requires ≥10µF ceramic bypass for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel independent input & enable | Enables true multi-rail architectures with isolated power domains-no shared VIN constraints or mandatory sequencing controllers. |
| Phased 90° switching across 8 channels | Reduces peak input current by up to 70% vs. in-phase operation-lowers bulk capacitor stress and EMI filter requirements. |
| Configurable 1A–4A per output | Four adjacent buck stages can be paralleled (e.g., BUCK1–BUCK4) using shared inductor and single FB-reduces component count and board area for high-current rails. |
| Integrated die temperature sensor | Provides calibrated analog voltage (150 mV @ 25°C, ±2°C accuracy) for real-time thermal monitoring-avoids need for external thermal ICs or NTCs. |
| Precision enable thresholds with hysteresis | 400–1200 mV rising threshold and 60 mV hysteresis ensure reliable, noise-immune startup across –40°C to 150°C-eliminates external RC timing networks. |
| Burst Mode + forced continuous dual-mode operation | MODE pin globally selects between high-efficiency light-load operation (Burst Mode) or low-noise fixed-frequency PWM-optimizes trade-off per system requirement. |
Applications
| Automotive ADAS Domain Controller | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering heterogeneous SoC subsystems (vision processor, radar MCU, CAN transceivers) with strict rail isolation and thermal monitoring. IC Role / Device Role / Timing Role: Primary multi-rail PMIC delivering 0.85V core, 1.2V memory, 1.8V interface, and 3.3V peripheral rails from 5V or 12V intermediate bus. Use Value: Independent VIN/EN per channel enables clean separation of noisy digital and sensitive analog domains; TEMP pin allows real-time die temp logging during thermal stress testing. |
Use Scenario: Generating isolated 3.3V, 5V, and 12V rails for field I/O conditioning, microcontroller, and communication interfaces in harsh factory environments. IC Role / Device Role / Timing Role: Centralized power management IC supporting hot-swap-capable backplane slots with autonomous sequencing and fault reporting. Use Value: PGOOD_ALL simplifies system-level watchdog integration; 150°C rating ensures reliability in uncooled enclosures; phased switching reduces conducted EMI on shared 24V input. |
| Telecom Baseband Unit | Medical Imaging Sensor Array |
Use Scenario: Supplying multiple FPGAs, ADCs, DACs, and RF front-end components in compact 5G baseband cards with stringent power integrity requirements. IC Role / Device Role / Timing Role: High-density buck regulator providing tightly regulated, low-noise supplies with minimal layout footprint and no external compensation. Use Value: 2.25V–5.5V input range accommodates diverse intermediate bus voltages; 1–3 MHz programmability enables EMI notch placement around critical IF bands. |
Use Scenario: Powering distributed CMOS image sensors and correlated double sampling (CDS) circuits requiring ultra-low noise and precise voltage tracking. IC Role / Device Role / Timing Role: Multi-output regulator delivering matched 1.2V, 1.8V, and 2.5V rails with <±1% load regulation and <10 mV p-p ripple in forced continuous mode. Use Value: MODE pin enables fixed-frequency operation to suppress switching noise in analog signal chains; FB pin flexibility supports remote sensing for long trace runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-channel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65218D0RSLR | 4-channel, max 3A total; integrated LDOs; fixed 2.2MHz fSW; no die temp sensor; 16-pin WQFN. | Targeted at Sitara AM335x/AM437x processors; lacks per-channel VIN independence and thermal telemetry. | Select when processor-specific integration (PMIC+LDO+RTC) is prioritized over thermal visibility and flexible rail count. |
| MAX20029ATGB/V+T | 4-channel, 2.5A/channel; 3.5–36V input; AEC-Q100 Grade-1; integrated watchdog; no FB shorting for parallel config. | Designed for automotive body electronics; higher input range but no 8-channel granularity or die temp monitoring. | Select for 12V/24V automotive systems requiring extended input range and functional safety features-not for high-channel-count, thermally monitored designs. |
Compared with TPS65218D0RSLR and MAX20029ATGB/V+T, the LTC3374HUHF#TRPBF uniquely delivers 8 independently configurable 1A buck channels with die temperature telemetry, per-channel VIN/EN, and scalable 1–4A parallel operation-making it optimal for thermally constrained, high-rail-count embedded systems where granular control and thermal margining are critical.
Availability
LTC3374HUHF#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, industrial PLC I/O modules, and telecom baseband units requiring stable component supply, extended temperature operation, and high-channel-count power integration.
Supply support for LTC3374HUHF#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3374HUHF#TRPBF belongs to the Linear Technology µModule and monolithic PMIC product line, designed specifically for high-density, thermally demanding multi-rail power systems in automotive, industrial, and communications infrastructure.
FAQ
What is the maximum junction temperature rating for the LTC3374HUHF#TRPBF?
The LTC3374HUHF#TRPBF is specified for operation from –40°C to 150°C junction temperature, with overtemperature shutdown activated at 165°C and 10°C hysteresis. This H-grade qualification makes the LTC3374HUHF#TRPBF suitable for under-hood automotive and high-ambient industrial applications where thermal headroom is critical. The exposed pad must be soldered to a solid ground plane to achieve the rated θJA of 34°C/W.
How does the LTC3374HUHF#TRPBF support power sequencing across its eight channels?
The LTC3374HUHF#TRPBF supports autonomous power sequencing through precision enable thresholds (400–1200 mV rising, 60 mV hysteresis) on each EN1–EN8 pin, allowing staggered activation without external controllers. Additionally, PGOOD_ALL provides a single open-drain signal indicating global rail health-enabling simple daisy-chained sequencing or system-level reset assertion. No external timing components are required.
Can the LTC3374HUHF#TRPBF be used to generate a 4A output, and how is it configured?
Yes, the LTC3374HUHF#TRPBF supports up to 4A per output by paralleling four adjacent buck regulators (e.g., BUCK1–BUCK4) using a shared inductor and connecting their FB pins to the same VIN node. This configuration leverages the internal current-limit scaling (IFWD4 = 9.2A typical) and maintains regulation accuracy. The LTC3374HUHF#TRPBF datasheet provides layout guidelines and stability recommendations for such parallel operation.
What is the function of the TEMP pin on the LTC3374HUHF#TRPBF, and how accurate is it?
The TEMP pin on the LTC3374HUHF#TRPBF outputs an analog voltage proportional to die temperature: 150 mV at 25°C with a slope of 6.75 mV/°C (typical). It is calibrated to ±2°C accuracy over –40°C to 125°C, enabling direct thermal telemetry for margining, derating, or closed-loop fan control. Unlike external sensors, it measures actual silicon temperature-not ambient or case temperature-making it ideal for thermal-aware system design.
Does the LTC3374HUHF#TRPBF require external compensation components for its buck regulators?
No, the LTC3374HUHF#TRPBF features internally compensated buck regulators. Each channel only requires external feedback resistors to set the output voltage and an external inductor + output capacitor. No external compensation network (e.g., type-II or type-III compensator) is needed, simplifying design, reducing BOM count, and improving layout robustness-especially important in high-channel-count applications like the LTC3374HUHF#TRPBF.
LTC3374HUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 8
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3374HUHF#TRPBF FAQ
1.How can I place an order for LTC3374HUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374HUHF#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 LTC3374HUHF#TRPBF reliable?
The price and inventory of LTC3374HUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374HUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3374HUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374HUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374HUHF#TRPBF?
LTC3374HUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374HUHF#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 LTC3374HUHF#TRPBF?
For technical support, including LTC3374HUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374HUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3374HUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3374HUHF#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 LTC3374HUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3374HUHF#TRPBF?
All LTC3374HUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374HUHF#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 LTC3374HUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3374HUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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