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Analog Devices Inc. LTC3374AEUHF#PBF
- Part No.:
- LTC3374AEUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3374AEUHF#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:296
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Product details
Overview
LTC3374AEUHF#PBF from Analog Devices is a high-accuracy, 8-channel parallelable 1A synchronous buck DC/DC converter IC with independent 2.25V–5.5V input supplies per channel, ±1% VFB accuracy for Buck 1, and integrated die temperature monitoring. It enables up to 4A output via master-slave configuration using shared inductors and supports automotive AEC-Q100 applications.
For engineers reviewing the LTC3374AEUHF#PBF datasheet, LTC3374AEUHF#PBF pinout, LTC3374AEUHF#PBF application, or LTC3374AEUHF#PBF equivalent, key selection criteria include multi-channel independent enable control, programmable 1MHz–3MHz switching frequency, precision sequencing thresholds, overvoltage indication, and thermal monitoring capability in a thermally enhanced 38-lead 5mm × 7mm QFN package.
Technical Context
The LTC3374AEUHF#PBF integrates eight fully independent synchronous buck regulators, each with internal PMOS/NMOS power switches (RDS(ON) = 205mΩ/125mΩ typ at VIN = 5V), programmable operating mode (Burst Mode® or forced continuous) via MODE pin, and 90° phase interleaving to reduce input ripple. All channels share a common oscillator that can be resistor-programmed (RT pin), synchronized externally (SYNC), or set to 2MHz default.
Each buck supports 0.8V to VIN output range, with Buck 1 featuring ±1% feedback voltage accuracy (796–804mV) and ±1% PGOOD accuracy; Bucks 2–8 have ±1.6% VFB accuracy (784–816mV). Overvoltage detection triggers at 107.5% of regulated VOUT with 3% hysteresis, and thermal shutdown activates at 170°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per channel - supports diverse rail inputs including 2.5V, 3.3V, and 5V system supplies. |
| Output Current per Buck | Up to 1A - scalable to 2A/3A/4A via parallel configuration of 2/3/4 channels with shared inductor. |
| Feedback Accuracy (Buck 1) | ±1% (796–804mV) - enables tight regulation for sensitive loads like FPGA core rails. |
| Switching Frequency | 1MHz to 3MHz programmable - allows optimization of size (higher f) vs efficiency (lower f) and EMI filtering. |
| Thermal Monitoring | TEMP pin outputs 220mV @ 25°C, 7mV/°C slope - provides direct die temperature readout without external sensor. |
| Overvoltage Detection | 107.5% of VOUT with 3% hysteresis - protects downstream circuitry from regulator fault conditions. |
| Package | 38-lead 5mm × 7mm QFN with exposed pad - achieves θJA = 34°C/W for high-power-density thermal management. |
Pinout & Package
Package: 38-lead plastic QFN (5mm × 7mm), exposed pad (Pin 39) connected to GND for thermal and electrical performance. Pin count and layout match both QFN (UHF) and TSSOP (FE) variants per datasheet Rev. A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 | Feedback inputs | Close regulation loop; FB2–FB8 tied to respective VIN pins enables master-slave current sharing. |
| VIN1–VIN8 | Independent input supplies | Enable true multi-rail operation; short adjacent VINs (e.g., VIN2 to VIN1) for combined-channel input. |
| SW1–SW8 | Switch nodes | Connect external inductors; phase-shifted 90° to minimize input capacitor RMS current. |
| EN1–EN8 | Individual enable inputs | Active-high logic; precise thresholds (e.g., 400mV rising) simplify autonomous power-up sequencing. |
| PGOOD_ALL | Global power-good indicator | Open-drain output asserts low if any enabled buck falls outside ±1% PGOOD window or exceeds OV threshold. |
| TEMP | Digital die temperature monitor | Analog voltage output (220mV @ 25°C, +7mV/°C) - enables real-time thermal margining and derating. |
| MODE | Global operating mode control | Low = Burst Mode® for light-load efficiency; high = forced continuous for low-noise, fixed-frequency operation. |
| RT / SYNC | Oscillator programming interface | RT sets frequency via resistor; SYNC accepts external clock (1–3MHz) with automatic slope compensation adaptation. |
Key Features
| Feature | Design Value |
|---|---|
| Eight independent 1A bucks | Enables compact, isolated power domains for SoC/FPGA I/O, memory, and peripheral rails without discrete converters. |
| 15 master-slave configurations | Supports flexible current scaling (2A/3A/4A) across 1–4 channels using single inductor per group - reduces BOM and board area. |
| ±1% VFB accuracy (Buck 1) | Meets stringent core voltage tolerance requirements for advanced processors and ASICs operating below 1V. |
| AEC-Q100 qualified | Rated for automotive junction temperatures up to 125°C (LTC3374AE grade), supporting infotainment and ADAS subsystems. |
| Die temperature monitoring | Eliminates need for external thermal sensors; TEMP pin output enables closed-loop thermal management in firmware. |
| Overvoltage (OV) indicator | Provides early fault detection beyond standard PGOOD, improving system reliability during transient overvoltage events. |
Applications
| Automotive Infotainment Power | FPGA Multi-Rail Supply |
|---|---|
Use Scenario: Powering display processor, audio DSP, and connectivity modules (Wi-Fi/BT) in head unit with independent voltage domains. IC Role / Device Role / Timing Role: Eight-channel buck IC delivers 1.0V (core), 1.2V (I/O), 1.8V (memory), 3.3V (peripherals) simultaneously from 3.3V/5V inputs. Use Value: Eliminates six discrete DC/DCs; AEC-Q100 qualification ensures operation across –40°C to 125°C ambient. | Use Scenario: Supplying Xilinx Artix-7 FPGA requiring separate 0.95V core, 1.2V auxiliary, 1.8V bank, and 3.3V I/O rails. IC Role / Device Role / Timing Role: Configured as four 1A bucks (core, aux, bank) plus one 2A buck (I/O) using VIN1–VIN2 parallel connection. Use Value: Achieves <90% efficiency at 500mA load per rail; ±1% VFB maintains FPGA timing margins under dynamic load transients. |
| Industrial PLC I/O Module | Communications Baseband Processor |
Use Scenario: Powering analog front-end, microcontroller, CAN transceiver, and isolated RS-485 interface in modular PLC slot. IC Role / Device Role / Timing Role: Independent EN1–EN8 pins sequence power to analog section before digital logic, preventing latch-up. Use Value: Precision enable thresholds (±20mV) ensure repeatable startup order; TEMP pin monitors thermal stress during extended 60°C operation. | Use Scenario: Supplying Qualcomm Snapdragon baseband processor with 0.8V CPU, 1.1V GPU, 1.2V memory, and 2.8V RF bias rails. IC Role / Device Role / Timing Role: Four 1A bucks operate in forced continuous mode (MODE = high) to suppress switching noise near sensitive RF sections. Use Value: 90° phase interleaving reduces input ripple by >50% vs single-phase design, easing EMI filter requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS650860A0RSMT | 6-channel, max 3A per channel; integrated LDOs; no die temperature monitor; 2.7V–5.5V input. | Targets compute modules needing mixed DC/DC + LDO outputs; lacks OV indicator and precision sequencing. | Choose when LDO integration outweighs thermal monitoring and OV protection needs. |
| ISL91211AIRZ-T7A | 4-channel, max 4A per channel; supports DVS; no independent VIN per channel; 2.5V–5.5V input. | Optimized for mobile APs with dynamic voltage scaling; requires shared input rail, limiting multi-supply flexibility. | Prefer for battery-powered devices where DVS and footprint are critical, not multi-input systems. |
Compared with TPS650860A0RSMT and ISL91211AIRZ-T7A, the LTC3374AEUHF#PBF uniquely combines per-channel input independence, die temperature sensing, overvoltage detection, and AEC-Q100 qualification - making it optimal for automotive and industrial systems demanding robust, thermally aware, multi-rail regulation.
Availability
LTC3374AEUHF#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and communications baseband processor power supplies requiring stable component supply across extended temperature ranges.
Supply support for LTC3374AEUHF#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3374A product line delivers highly integrated, thermally robust multi-output DC/DC solutions for space-constrained systems requiring independent rail control, precision sequencing, and automotive-grade reliability.
FAQ
What is the maximum output current achievable with LTC3374AEUHF#PBF?
LTC3374AEUHF#PBF supports up to 4A output current by paralleling four of its eight 1A buck regulators in master-slave configuration using a single inductor per group. Each combination (2A/3A/4A) requires specific FB-to-VIN connections per datasheet Section "PIN FUNCTIONS", and current limits scale to 3.6A (2-buck) and 7.2A (4-buck) per the ILIM specification table.
Does LTC3374AEUHF#PBF support synchronization to an external clock?
Yes, LTC3374AEUHF#PBF supports external clock synchronization via the SYNC pin, accepting 1MHz–3MHz TTL/CMOS signals. When driven, the internal slope compensation automatically adapts to maintain stability, and all eight bucks lock to the applied frequency - enabling coherent switching in multi-IC systems to reduce beat frequencies and EMI.
How does the TEMP pin on LTC3374AEUHF#PBF function?
The TEMP pin on LTC3374AEUHF#PBF outputs an analog voltage proportional to die temperature: 220mV at 25°C with a slope of 7mV/°C (typical). This allows direct measurement of junction temperature without external sensors. Tying TEMP to VCC disables the monitor and saves ~12µA of VCC quiescent current, as specified in the Pin Functions section.
What is the purpose of the MODE pin on LTC3374AEUHF#PBF?
The MODE pin on LTC3374AEUHF#PBF selects global operating mode: logic low enables Burst Mode® operation for highest light-load efficiency, while logic high forces continuous conduction mode across all eight bucks - eliminating low-frequency switching artifacts critical for noise-sensitive analog or RF circuits powered by LTC3374AEUHF#PBF.
Is LTC3374AEUHF#PBF pin-compatible with the original LTC3374?
Yes, LTC3374AEUHF#PBF is a pin-compatible upgrade to the LTC3374, offering higher efficiency, improved output voltage accuracy (±1% for Buck 1), and added overvoltage indication functionality. No PCB layout changes are required when migrating from LTC3374 to LTC3374AEUHF#PBF, and all existing schematics and footprints remain valid.
LTC3374AEUHF#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3374AEUHF#PBF FAQ
1.How can I place an order for LTC3374AEUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374AEUHF#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 LTC3374AEUHF#PBF reliable?
The price and inventory of LTC3374AEUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374AEUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3374AEUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374AEUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374AEUHF#PBF?
LTC3374AEUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374AEUHF#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 LTC3374AEUHF#PBF?
For technical support, including LTC3374AEUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374AEUHF#PBF requirements.
6.How does Aetrix verify that LTC3374AEUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3374AEUHF#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 LTC3374AEUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3374AEUHF#PBF?
All LTC3374AEUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374AEUHF#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 LTC3374AEUHF#PBF part is unused and in its original packaging.
Return procedure for LTC3374AEUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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