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Analog Devices Inc. LTC3374AHUHF#PBF
- Part No.:
- LTC3374AHUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3374AHUHF#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3374AHUHF#PBF from Analog Devices is a high-accuracy, 8-channel parallelable 1A synchronous buck DC/DC regulator IC. It integrates eight independent 1A buck converters powered from separate 2.25V–5.5V inputs, supports up to 4A output via master-slave configuration with shared inductor, and delivers ±1% VFB accuracy for Buck 1 and ±1% PGOOD accuracy. It is used in multichannel power supplies for automotive ADAS domain controllers requiring precise rail sequencing and thermal monitoring.
For engineers reviewing the LTC3374AHUHF#PBF datasheet, LTC3374AHUHF#PBF pinout, LTC3374AHUHF#PBF application, or LTC3374AHUHF#PBF equivalent, key selection criteria include its 38-lead 5mm × 7mm QFN package with exposed pad, –40°C to 150°C junction temperature rating, programmable 1MHz–3MHz oscillator, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC3374AHUHF#PBF implements eight independent synchronous buck regulators with phase-shifted 90° switching to reduce input ripple. Each channel features precision enable thresholds (380–420mV rising), programmable operating mode (Burst Mode® or forced continuous) via MODE pin, and individual feedback pins supporting 0.8V to VIN output range.
It includes integrated overvoltage indication (107.5% VOUT threshold), die temperature monitoring (220mV at 25°C, 7mV/°C slope), and robust protection: undervoltage lockout on VCC (2.45V) and each VIN (2.05V), plus overtemperature shutdown at 170°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Count | Eight independent synchronous buck regulators, configurable as 15 master/slave combinations up to 4A per group. |
| Input Voltage Range | 2.25V to 5.5V per channel - enables flexible multi-rail input sourcing from diverse system supplies. |
| Output Accuracy | ±1% VFB for Buck 1 (792–808mV), ±1.6% for Bucks 2–8 (784–816mV) - ensures tight regulation across all channels. |
| Oscillator Frequency | Programmable 1MHz–3MHz via RT resistor or external SYNC signal; default 2MHz - allows EMI optimization and layout flexibility. |
| Thermal Rating | –40°C to 150°C junction temperature - qualified for under-hood automotive applications per AEC-Q100. |
| Package | 38-lead 5mm × 7mm QFN with exposed thermal pad - provides low θJA = 34°C/W for high-power density designs. |
| Protection Features | Overvoltage detection (107.5% VOUT, 3% hysteresis), PGOOD_ALL open-drain status, and die temperature monitor output - enables system-level fault reporting and thermal management. |
Pinout & Package
Package: 38-lead plastic QFN (5mm × 7mm), exposed pad (Pin 39) tied to GND for thermal and electrical performance. Requires soldering to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 | Feedback input for each buck regulator | Connects to resistor divider to set output voltage; FB2–FB8 tied to respective VIN for master-slave current sharing. |
| VIN1–VIN8 | Independent input supply for each buck | Each accepts 2.25V–5.5V; short adjacent VINs (e.g., VIN2 to VIN1) when combining channels for higher current. |
| SW1–SW8 | Switch node for each buck converter | Connects to external inductor; phase-shifted 90° switching reduces input capacitor RMS current. |
| EN1–EN8 | Active-high enable control per channel | Thresholds: 380–420mV rising, 300–340mV falling - enables autonomous power-up sequencing without external logic. |
| PGOOD_ALL | Open-drain fault indicator | Drives LOW if any enabled buck's output falls below 94–98% VOUT or exceeds 109% VOUT - simplifies system health monitoring. |
| TEMP | Digital die temperature monitor | Outputs 220mV at 25°C with 7mV/°C slope - enables real-time thermal derating and safety shutdown coordination. |
| MODE | Global operating mode selector | LOW = Burst Mode® for light-load efficiency; HIGH = forced continuous mode for low-noise operation. |
| RT / SYNC | Oscillator programming interface | RT sets frequency via resistor (1–3MHz); SYNC accepts external clock - critical for EMI-sensitive automotive systems. |
Key Features
| Feature | Design Value |
|---|---|
| Eight 1A synchronous bucks | Enables compact, discrete-free multirail power for SoC/FPGA subsystems - eliminates need for eight separate converters. |
| Master-slave configurability | Supports 15 combinations (e.g., 2×2A, 1×4A) using shared inductors - reduces BOM count, board area, and cost vs. discrete solutions. |
| ±1% VFB accuracy (Buck 1) | Ensures stable core voltage for high-performance processors even under load transients - meets strict SoC VDD tolerance requirements. |
| AEC-Q100 Grade H | Qualified for –40°C to +150°C operation - certified for engine bay and ADAS ECU deployments without derating. |
| Phase-shifted 90° switching | Reduces input capacitor RMS current by ~30% vs. in-phase operation - lowers required capacitance and improves EMI profile. |
Applications
| Automotive ADAS Domain Controller | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering multiple voltage rails (1.2V CPU core, 1.8V memory, 3.3V I/O, 5V sensors) in a centralized ADAS domain ECU. IC Role / Device Role / Timing Role: Primary multichannel PMIC delivering sequenced, monitored, and protected power to heterogeneous compute and sensing subsystems. Use Value: Single-chip solution replaces eight discrete buck ICs, reduces layout complexity, and enables AEC-Q100-compliant thermal management via TEMP pin. | Use Scenario: Generating isolated and non-isolated rails for analog front-end, microcontroller, communication interfaces (RS-485, CAN), and field I/O drivers in modular PLC backplanes. IC Role / Device Role / Timing Role: Centralized power manager providing independently controllable, current-scalable outputs with precise enable timing. Use Value: Enables flexible rail assignment (e.g., combine Buck 1+2 for 2A analog supply), reduces component count, and supports hot-swap-safe sequencing via precision EN thresholds. |
| Communications Baseband Unit | Medical Imaging Signal Chain |
Use Scenario: Supplying clean, low-noise power to FPGA fabric, ADC/DAC arrays, RF transceivers, and memory in 5G baseband processing units. IC Role / Device Role / Timing Role: High-efficiency, low-EMI multirail source with programmable Burst/Continuous mode per system load condition. Use Value: Phase-shifted switching minimizes conducted EMI into sensitive RF sections; 2MHz default frequency avoids critical LTE/5G bands. | Use Scenario: Powering low-noise analog signal chains (AFE, PGA, ADC), digital processing cores, and display interfaces in portable ultrasound or MRI subsystems. IC Role / Device Role / Timing Role: Precision-regulated, thermally monitored power source ensuring signal integrity and patient safety compliance. Use Value: ±1% VFB accuracy maintains ADC reference stability; TEMP pin enables real-time thermal derating to prevent image artifacts during prolonged acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3374AEUHF#PBF | Same functionality and pinout, but rated for –40°C to +125°C junction temperature. | Suitable for cabin electronics or industrial control where ambient temperature remains below 125°C. | Select when AEC-Q100 Grade H (150°C) is not required - lower cost and broader distributor availability. |
| TPS65270PWP | Triple-output buck (2×2A + 1×3A), no phase shifting, no die temperature monitor, 0.8V–5.5V input, -40°C to 85°C. | Targeted at cost-sensitive consumer or computing applications lacking automotive thermal or EMI requirements. | Choose only for simpler 3-rail systems without master-slave scalability or thermal monitoring needs. |
Compared with LTC3374AEUHF#PBF and TPS65270PWP, the LTC3374AHUHF#PBF uniquely combines AEC-Q100 Grade H qualification, eight scalable channels, phase-shifted EMI reduction, and integrated die temperature sensing - making it the only option for high-reliability automotive domain controllers requiring full thermal visibility and 150°C operation.
Availability
LTC3374AHUHF#PBF is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, industrial PLC I/O modules, and communications baseband units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3374AHUHF#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 multichannel DC/DC power management ICs designed specifically for automotive domain controllers and high-density embedded systems requiring precision regulation, scalability, and AEC-Q100 compliance.
FAQ
What is the maximum junction temperature rating for the LTC3374AHUHF#PBF?
The LTC3374AHUHF#PBF is rated for a maximum junction temperature of 150°C and is AEC-Q100 qualified for Grade H automotive operation. Its overtemperature shutdown activates at 170°C with 10°C hysteresis, and the exposed thermal pad (Pin 39) must be soldered to a PCB ground plane to maintain θJA = 34°C/W and ensure reliable thermal performance in high-power applications.
How does the LTC3374AHUHF#PBF support master-slave configurations for higher current outputs?
The LTC3374AHUHF#PBF supports 15 master-slave combinations (e.g., two 2A channels or one 4A channel) by shorting adjacent VIN pins and connecting corresponding FB pins to VIN (e.g., FB2 to VIN2). This enables shared inductor operation while maintaining regulation accuracy. The IC internally coordinates phase alignment and current sharing - no external controllers or current-sense resistors are needed for basic configurations.
What is the function of the TEMP pin on the LTC3374AHUHF#PBF?
The TEMP pin on the LTC3374AHUHF#PBF outputs a voltage proportional to die temperature: 220mV at 25°C with a slope of 7mV/°C (typical). This analog signal enables real-time thermal monitoring and system-level derating decisions. To disable the monitor and save ~12µA quiescent current, tie TEMP directly to VCC - a design choice confirmed in the official datasheet's Pin Functions section.
Can the LTC3374AHUHF#PBF operate with different input voltages on each channel?
Yes, the LTC3374AHUHF#PBF supports independent input supplies for each of its eight buck regulators, with each VIN pin accepting 2.25V to 5.5V. This allows heterogeneous power sourcing - for example, VIN1 from a 3.3V LDO, VIN2 from a 5V bus, and VIN3 from a 12V-to-5V intermediate stage - enabling flexible, optimized power architecture in complex systems without cross-regulation interference.
What protection features does the LTC3374AHUHF#PBF provide beyond standard overcurrent and thermal shutdown?
Beyond overcurrent limiting (1.4–7.2A depending on channel count) and overtemperature shutdown, the LTC3374AHUHF#PBF includes overvoltage indication (107.5% VOUT threshold, 3% hysteresis), precision PGOOD_ALL monitoring (94–99% VOUT window), and individual undervoltage lockout on VCC (2.45V) and each VIN (2.05V). These features enable comprehensive system-level fault detection and safe power sequencing in mission-critical applications.
LTC3374AHUHF#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)
LTC3374AHUHF#PBF FAQ
1.How can I place an order for LTC3374AHUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374AHUHF#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 LTC3374AHUHF#PBF reliable?
The price and inventory of LTC3374AHUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374AHUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3374AHUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374AHUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374AHUHF#PBF?
LTC3374AHUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374AHUHF#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 LTC3374AHUHF#PBF?
For technical support, including LTC3374AHUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374AHUHF#PBF requirements.
6.How does Aetrix verify that LTC3374AHUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3374AHUHF#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 LTC3374AHUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3374AHUHF#PBF?
All LTC3374AHUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374AHUHF#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 LTC3374AHUHF#PBF part is unused and in its original packaging.
Return procedure for LTC3374AHUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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