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Analog Devices Inc. LTC3374EUHF#PBF
- Part No.:
- LTC3374EUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3374EUHF#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:526
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Product details
Overview
LTC3374EUHF#PBF from Analog Devices (formerly Linear Technology) is an 8-channel, 1A per channel synchronous buck DC/DC regulator IC with independent input supplies (2.25V–5.5V), programmable 1MHz–3MHz switching frequency, and precision enable thresholds for autonomous power-up sequencing in multirail systems. It supports master-slave parallel configuration up to 4A per output using a shared inductor.
For engineers reviewing the LTC3374EUHF#PBF datasheet, LTC3374EUHF#PBF pinout, LTC3374EUHF#PBF application, or LTC3374EUHF#PBF equivalent, key selection considerations include per-channel VIN independence, die temperature monitoring via TEMP pin, phased 90° switching to reduce input ripple, PGOOD_ALL fault reporting, and MODE-selectable Burst Mode® vs forced continuous operation.
Technical Context
The LTC3374EUHF#PBF integrates eight fully independent synchronous buck regulators, each with dedicated VIN, SW, FB, and EN pins, enabling flexible rail assignment and isolation. All channels share a common oscillator architecture-programmable via RT resistor, synchronizable via SYNC, or fixed at 2MHz-and support combined operation (2/3/4-phase) with current limits scaled to 4.6A/6.9A/9.2A respectively.
It implements precision analog circuitry for autonomous sequencing: EN pins feature dual-threshold hysteresis (400–1200mV rising, 60mV hysteresis), VCC and VIN undervoltage lockout (2.45V/2.05V typical), and a calibrated die temperature sensor (150mV @ 25°C, 6.75mV/°C slope) with overtemperature shutdown at 165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 8 independent 1A synchronous buck regulators |
| Input voltage range | 2.25V to 5.5V per channel - supports mixed-supply system partitioning |
| Output voltage range | 0.8V to VIN - enables low-voltage core rails and wide VOUT flexibility |
| Switching frequency | 1MHz to 3MHz (programmable via RT) - balances efficiency, size, and EMI |
| Thermal monitoring | Dedicated TEMP pin with 6.75mV/°C slope - enables real-time die temperature tracking without external sensors |
| Power-good reporting | PGOOD_ALL open-drain output - asserts low if any enabled regulator falls >7.5% below target |
| Operating modes | Burst Mode® (low IQ) or forced continuous PWM (low noise) - selected globally via MODE pin |
Pinout & Package
The LTC3374EUHF#PBF is housed in a thermally enhanced 38-lead 5mm × 7mm plastic QFN package (UHF) with exposed GND pad (Pin 39) requiring solder connection to PCB ground plane for electrical integrity and thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 | Feedback input | Resistor-divider node for output voltage regulation; shorting FBx to VINx enables master-slave parallel operation |
| VIN1–VIN8 | Independent input supply | Each channel accepts separate 2.25V–5.5V source - enables domain-isolated power delivery |
| SW1–SW8 | Switch node | Connects to external inductor; supports phase interleaving (90° offset) to reduce input ripple current |
| EN1–EN8 | Enable control | Active-high logic; precision thresholds (400–1200mV) allow reliable autonomous power-up sequencing |
| PGOOD_ALL | Global fault indicator | Open-drain output pulled low if any enabled regulator's output deviates >7.5% from setpoint |
| TEMP | Digital temperature monitor | Analog voltage output (150mV @ 25°C, +6.75mV/°C) - provides direct die temperature readout |
| MODE | Operating mode select | Low = Burst Mode® (high light-load efficiency); high = forced continuous (fixed-frequency, low ripple) |
| RT / SYNC | Oscillator control | RT sets frequency via resistor; SYNC accepts external clock (1–3MHz) for system-wide timing alignment |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel VIN independence | Enables heterogeneous supply domains (e.g., 3.3V, 2.5V, 1.8V inputs) without level-shifting or cross-coupling |
| Phased 90° switching | Reduces RMS input capacitor ripple current by up to 71% versus in-phase operation - lowers input cap size and cost |
| Scalable current combining | Up to four adjacent channels can be paralleled (e.g., BUCK1–BUCK4) to deliver 2A/3A/4A with single inductor and shared feedback |
| Precision enable thresholds | Guaranteed 400–1200mV rising threshold with 60mV hysteresis - ensures deterministic, repeatable power-up order across temperature |
| Dedicated die temperature sensing | Calibrated analog TEMP output eliminates need for external thermal diode or NTC - simplifies thermal management design |
Applications
| Industrial PLC I/O Modules | Automotive ADAS Domain Controllers |
|---|---|
|
Use Scenario: Powering mixed-voltage FPGA I/O banks, ADC/DAC reference rails, and isolated communication interfaces (RS-485, CAN) within compact industrial controllers. IC Role / Device Role / Timing Role: Multichannel buck regulator providing eight independently configured, sequenced, and monitored DC rails from diverse input sources. Use Value: Eliminates discrete LDOs and multiple controllers; reduces BOM count by >60% while enabling precise rail sequencing and real-time thermal margining. |
Use Scenario: Supplying vision processor cores, memory subsystems, radar SoCs, and sensor interface circuits in centralized ADAS ECUs with strict functional safety requirements. IC Role / Device Role / Timing Role: High-integration power management IC delivering ASIL-B compliant voltage rails with PGOOD_ALL fault reporting and overtemperature protection. Use Value: Meets ISO 26262 diagnostic coverage requirements via integrated PGOOD_ALL and die temperature monitoring - avoids external supervision ICs. |
| Communications Baseband Units | High-Density Server Management Cards |
|
Use Scenario: Generating bias voltages for RF front-end components, low-noise amplifiers, and digital baseband ASICs in 5G macrocell and small-cell radio units. IC Role / Device Role / Timing Role: Eight-channel buck controller supporting both Burst Mode® (for standby power savings) and forced continuous mode (for low-noise signal chain operation). Use Value: Achieves <85µA quiescent current in Burst Mode® while maintaining <10mVpp output ripple in forced continuous mode - satisfies dual-mode RF power demands. |
Use Scenario: Powering BMC (Baseboard Management Controller), CPLD, EEPROM, fan controllers, and sensor interfaces on server motherboard management cards with space-constrained layouts. IC Role / Device Role / Timing Role: Compact, thermally robust multirail regulator enabling full rail sequencing, fault detection, and thermal telemetry in <1000mm² board area. Use Value: Exposed-pad QFN package delivers 34°C/W θJA - sustains full 8×1A operation at 70°C ambient without derating, reducing need for airflow or heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ8645PGU-AEC1-Z | 4-channel, 4A/channel; no per-channel VIN independence; AEC-Q100 Grade 1 rated | Targeted for automotive single-rail high-current applications only; lacks 8-rail granularity and independent inputs | Select when needing higher per-rail current (>1A) and automotive qualification, but sacrificing channel count and supply flexibility |
| TPS6508641RSLR | 6-channel PMIC with integrated LDOs, battery charger, and I2C interface; fixed 3.3V/1.8V/1.2V outputs | Designed for Intel Atom/Celeron platforms; not reconfigurable for arbitrary VOUT or VIN combinations | Select for x86-based embedded designs requiring tightly coupled power + fuel gauge + I2C control - not for custom multirail systems |
Compared with MPQ8645PGU-AEC1-Z and TPS6508641RSLR, the LTC3374EUHF#PBF uniquely delivers eight independently configurable 1A buck channels with per-VIN flexibility, making it optimal for complex, domain-isolated power architectures where rail count, sequencing control, and thermal visibility outweigh integrated communication or automotive certification needs.
Availability
LTC3374EUHF#PBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS ECUs, and 5G baseband units requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to 125°C operation.
Supply support for LTC3374EUHF#PBF 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 analog and power management portfolio with rigorous reliability standards and automotive-grade validation.
The LTC3374EUHF#PBF belongs to Linear's high-density multichannel DC/DC regulator product line, designed specifically for space-constrained, thermally demanding applications requiring granular rail control, autonomous sequencing, and real-time thermal telemetry.
FAQ
What is the maximum output current achievable per channel using the LTC3374EUHF#PBF?
The LTC3374EUHF#PBF supports up to 4A per output by combining up to four adjacent buck channels (e.g., BUCK1–BUCK4) in master-slave configuration with a shared inductor and feedback network. Each individual channel delivers 1A, and combined configurations yield 2A, 3A, or 4A with corresponding PMOS current limits of 4.6A, 6.9A, and 9.2A respectively - verified in Electrical Characteristics tables.
Does the LTC3374EUHF#PBF support independent input voltages for each channel?
Yes, the LTC3374EUHF#PBF explicitly supports independent 2.25V to 5.5V input supplies for all eight channels (VIN1–VIN8). This enables true domain isolation - for example, powering FPGA I/O banks from 3.3V while supplying core logic from 1.2V - without cross-regulation or shared input impedance issues.
How does the MODE pin affect operation of the LTC3374EUHF#PBF?
The MODE pin globally selects between two operating modes for all enabled buck regulators: low voltage enables Burst Mode® operation (optimized for light-load efficiency, IQ <85µA), while high voltage forces continuous PWM mode (fixed frequency, lower output ripple, suitable for noise-sensitive signal chains). This setting applies uniformly across all active channels.
What is the function of the TEMP pin on the LTC3374EUHF#PBF?
The TEMP pin on the LTC3374EUHF#PBF provides an analog voltage proportional to die temperature: 150mV at 25°C with a slope of 6.75mV/°C. This calibrated output allows direct measurement of internal junction temperature without external components, supporting thermal margining, derating decisions, and overtemperature protection (shutdown at 165°C).
Can the LTC3374EUHF#PBF be synchronized to an external clock?
Yes, the LTC3374EUHF#PBF supports external synchronization via the SYNC pin, accepting TTL/CMOS-compatible clock signals from 1MHz to 3MHz. When driven, the internal oscillator locks to the external frequency and automatically adjusts slope compensation - ensuring stable operation across varying input conditions and eliminating beat frequencies in multi-IC systems.
LTC3374EUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC3374EUHF#PBF FAQ
1.How can I place an order for LTC3374EUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374EUHF#PBF 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 LTC3374EUHF#PBF reliable?
The price and inventory of LTC3374EUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374EUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3374EUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374EUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374EUHF#PBF?
LTC3374EUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374EUHF#PBF 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 LTC3374EUHF#PBF?
For technical support, including LTC3374EUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374EUHF#PBF requirements.
6.How does Aetrix verify that LTC3374EUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3374EUHF#PBF 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 LTC3374EUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3374EUHF#PBF?
All LTC3374EUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374EUHF#PBF, 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 LTC3374EUHF#PBF part is unused and in its original packaging.
Return procedure for LTC3374EUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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