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Analog Devices Inc. LTC3374IUHF#PBF
- Part No.:
- LTC3374IUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3374IUHF#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:583
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Product details
Overview
LTC3374IUHF#PBF 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 VIN pin, 0.8V–VIN output range, and programmable 1MHz–3MHz switching frequency. It supports parallel configuration up to 4A per output using shared inductors and is used in multirail power management for FPGA, SoC, and industrial control systems.
For engineers reviewing the LTC3374IUHF#PBF datasheet, LTC3374IUHF#PBF pinout, LTC3374IUHF#PBF application, or LTC3374IUHF#PBF equivalent, key selection criteria include per-channel enable precision (±40mV hysteresis), die temperature monitoring via TEMP pin (150mV @ 25°C, 6.75mV/°C slope), PGOOD_ALL fault reporting, and thermal performance in the 38-lead 5mm × 7mm QFN package with exposed GND pad.
Technical Context
The LTC3374IUHF#PBF integrates eight fully independent synchronous buck regulators, each with dedicated VIN, SW, FB, and EN pins, enabling flexible rail assignment and autonomous sequencing. All channels share a common oscillator architecture-programmable via RT resistor, synchronizable via SYNC, or fixed at 2MHz-and employ 90° phase interleaving to reduce input ripple.
Operating mode (Burst Mode® vs forced continuous) is globally controlled by the MODE pin, while parallel operation is implemented by connecting FBx to VINy to form master-slave pairs. Thermal protection triggers at 165°C with 10°C hysteresis, and the TEMP pin provides analog die temperature feedback for system-level thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 8 independent 1A synchronous buck regulators, configurable as 1–4 parallel groups per output |
| Input voltage range | 2.25V to 5.5V per VIN pin-supports mixed-rail inputs and isolated supply domains |
| Output voltage range | 0.8V to VIN-enables low-voltage core rails (e.g., 0.8V, 1.0V, 1.2V, 1.8V) without external reference |
| Switching frequency | 1MHz to 3MHz (programmable via RT); default 2MHz internal oscillator; synchronizable via SYNC pin |
| Enable threshold accuracy | ±40mV hysteresis on EN pins ensures reliable power-up sequencing across temperature (–40°C to 125°C) |
| Die temperature monitor | TEMP pin outputs 150mV @ 25°C with 6.75mV/°C slope-enables real-time thermal margining and overtemperature warning |
| Package thermal resistance | θJA = 34°C/W (QFN UHF package)-requires soldered exposed pad to PCB ground plane for rated performance |
Pinout & Package
Package: 38-lead 5mm × 7mm plastic QFN (UHF) with exposed GND pad (Pin 39), rated for –40°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 | Feedback input for buck regulators 1–8 | Connects to resistor divider to set output voltage; shorting FBx to VINy enables parallel operation |
| VIN1–VIN8 | Independent input supply pins | Each accepts 2.25V–5.5V; must be bypassed with ≥10µF ceramic capacitor to GND |
| SW1–SW8 | Switch node outputs | Drive external inductors; layout requires low-inductance path to minimize EMI and losses |
| EN1–EN8 | Active-high enable inputs | Enable individual regulators; precision thresholds support autonomous sequencing without external controllers |
| PGOOD_ALL | Open-drain fault status output | Pulled low if any enabled regulator's output drops >7.5% below regulation-used for system power-good assertion |
| MODE | Global operating mode control | Low = Burst Mode® (high light-load efficiency); high = forced continuous (low-noise, fixed-frequency PWM) |
| SYNC / RT | Oscillator control interface | SYNC accepts external clock (1–3MHz); RT sets frequency via resistor (402kΩ = 2MHz) or ties to VCC for default |
| TEMP | Analog die temperature monitor | Provides calibrated voltage (150mV @ 25°C, ±6.75mV/°C) for thermal telemetry and safety shutdown coordination |
| VCC | Internal bias supply | 2.7V–5.5V input; powers internal logic and must be bypassed with ≥10µF ceramic capacitor |
| GND (Pin 39) | Power and signal ground | Exposed thermal pad-must be soldered to solid PCB ground plane for electrical integrity and thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel independent enable & feedback | Enables precise power sequencing and dynamic rail reconfiguration without external PMIC logic |
| Phase-interleaved switching (90° steps) | Reduces RMS input current ripple by ~30% versus single-phase, lowering input capacitor stress and EMI |
| Configurable parallel operation (up to 4A/output) | Supports scalable current delivery using shared inductors-reduces BOM count and board area vs discrete solutions |
| Integrated die temperature sensing | Eliminates need for external thermal sensor; enables closed-loop thermal throttling in FPGA/ASIC power systems |
| Robust fault reporting (PGOOD_ALL) | Single-pin system-level power-good status simplifies monitoring and avoids cascading failures in multirail systems |
| Wide input voltage range per channel | Allows direct connection to diverse sources (Li-ion, USB PD, intermediate rails) without pre-regulation |
Applications
| FPGA Core & I/O Power | Automotive ADAS Domain Controller |
|---|---|
|
Use Scenario: Powering heterogeneous voltage domains (core, memory, I/O, auxiliary) in Xilinx Kintex or Intel Agilex FPGAs. IC Role / Device Role / Timing Role: Primary multichannel buck regulator providing eight independently sequenced, tightly regulated rails. Use Value: Enables single-chip solution for complex rail maps; phase interleaving reduces input capacitance requirements by 40% versus discrete converters. |
Use Scenario: Supplying multiple processor cores, vision processors, CAN transceivers, and sensor interfaces in Tier-1 ADAS ECUs. IC Role / Device Role / Timing Role: Centralized power management IC delivering ASIL-B compliant rails with thermal monitoring and fault reporting. Use Value: Die temperature sensing allows real-time thermal derating of compute rails during sustained vision processing loads. |
| Industrial PLC CPU Module | 5G Small Cell Baseband Unit |
|
Use Scenario: Powering ARM Cortex-A series MPU, DDR4 memory, Ethernet PHY, and field I/O drivers in modular PLC backplanes. IC Role / Device Role / Timing Role: High-density, thermally robust DC/DC controller supporting wide ambient temperature operation (–40°C to 125°C). Use Value: Independent VIN pins allow direct connection to 3.3V, 5V, and 12V backplane rails-eliminating intermediate conversion stages. |
Use Scenario: Generating low-noise, fast-transient rails for massive MIMO baseband ASICs and RF front-end bias supplies. IC Role / Device Role / Timing Role: Multichannel buck regulator with forced continuous mode (via MODE pin) for ultra-low output ripple on sensitive analog rails. Use Value: Synchronization capability (SYNC pin) enables deterministic timing alignment across all 8 channels for coherent signal processing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2964GQ-Z (Monolithic Power) | 4-channel, 4A/channel; no die temperature monitor; fixed 500kHz–2.2MHz frequency; smaller 32-pin QFN | Targeted at high-current, lower-channel-count applications where thermal telemetry is not required | Select when total output current demand exceeds 4A per rail and thermal monitoring is secondary to cost and footprint |
| TPS650861RSLR (Texas Instruments) | 6-channel, 3A max per rail; integrated LDOs; I²C programmability; 0.6V–3.6V output range; 48-pin VQFN | Designed for Intel Atom/Celeron platforms with firmware-configurable sequencing and telemetry | Select when system-level programmability, digital interface, and mixed buck+LDO integration are required over analog simplicity |
Compared with MP2964GQ-Z and TPS650861RSLR, the LTC3374IUHF#PBF offers superior channel count (8 vs 4/6), analog thermal monitoring, and per-VIN flexibility-making it optimal for dense, thermally constrained, or mixed-input-rail designs where digital control adds unnecessary complexity.
Availability
LTC3374IUHF#PBF is available at Aetrix Electronics and suitable for FPGA power management, automotive ADAS domain controllers, and industrial PLC CPU modules requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to 125°C operation.
Supply support for LTC3374IUHF#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 power management portfolio, emphasizing precision, efficiency, and reliability for demanding analog-intensive applications.
The LTC3374IUHF#PBF belongs to Linear's multichannel buck regulator product line, designed specifically for space-constrained, thermally challenging systems requiring independent rail control, sequencing, and real-time thermal awareness-such as advanced computing, automotive, and industrial edge devices.
FAQ
What is the maximum output current achievable per rail with LTC3374IUHF#PBF?
The LTC3374IUHF#PBF supports up to 4A per output rail by paralleling four of its eight 1A buck regulators (e.g., BUCK1–BUCK4) using shared inductors and interconnecting FB and VIN pins as master-slave pairs. This configuration is validated in the datasheet with IFWD4 = 9.2A typical PMOS current limit and requires careful layout to balance current sharing and thermal distribution across the paralleled channels.
Does LTC3374IUHF#PBF require external compensation components?
No, the LTC3374IUHF#PBF features internally compensated buck regulators. Only external feedback resistors (for output voltage setting) and input/output ceramic capacitors (≥10µF per VIN, ≥10µF–22µF per VOUT) are required. No external compensation network (e.g., RC, type-II/III) is needed-simplifying design and reducing bill-of-materials count.
How does the TEMP pin on LTC3374IUHF#PBF function in system thermal management?
The TEMP pin on LTC3374IUHF#PBF outputs an analog voltage proportional to die temperature (150mV at 25°C, +6.75mV/°C). This signal can be read by an external ADC or comparator to trigger thermal throttling, fan control, or system shutdown before the 165°C overtemperature shutdown activates-providing early warning and graceful degradation instead of abrupt fault recovery.
Can LTC3374IUHF#PBF operate with different input voltages on each VIN pin?
Yes, LTC3374IUHF#PBF explicitly supports independent input supplies on VIN1–VIN8, each ranging from 2.25V to 5.5V. This allows direct connection to disparate sources (e.g., 3.3V logic rail, 5V USB, 12V intermediate bus via LDO) without level-shifting or pre-regulation-enabling true mixed-rail power architecture in compact systems.
What is the purpose of the PGOOD_ALL pin on LTC3374IUHF#PBF?
The PGOOD_ALL pin on LTC3374IUHF#PBF is an open-drain output that asserts LOW whenever the regulated output voltage of any enabled buck regulator falls more than 7.5% below its programmed value. It serves as a consolidated system-level power-good indicator-simplifying motherboard monitoring and eliminating the need for eight separate PGOOD signals or external OR-ing logic.
LTC3374IUHF#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)
LTC3374IUHF#PBF FAQ
1.How can I place an order for LTC3374IUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374IUHF#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 LTC3374IUHF#PBF reliable?
The price and inventory of LTC3374IUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374IUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3374IUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374IUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374IUHF#PBF?
LTC3374IUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374IUHF#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 LTC3374IUHF#PBF?
For technical support, including LTC3374IUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374IUHF#PBF requirements.
6.How does Aetrix verify that LTC3374IUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3374IUHF#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 LTC3374IUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3374IUHF#PBF?
All LTC3374IUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374IUHF#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 LTC3374IUHF#PBF part is unused and in its original packaging.
Return procedure for LTC3374IUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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