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Analog Devices Inc. LTC3374AIFE#TRPBF
- Part No.:
- LTC3374AIFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3374AIFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,528
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Product details
Overview
LTC3374AIFE#TRPBF from Analog Devices is an 8-channel synchronous buck DC/DC power supply IC with independent 1A per channel capability, ±1% VFB accuracy for Buck 1, 1MHz–3MHz programmable switching frequency, and AEC-Q100 qualification for automotive systems requiring multirail voltage regulation under tight thermal constraints.
For engineers reviewing the LTC3374AIFE#TRPBF datasheet, LTC3374AIFE#TRPBF pinout, LTC3374AIFE#TRPBF application, or LTC3374AIFE#TRPBF equivalent, this page delivers verified pin functions, master/slave configuration options up to 4A per rail, thermal monitoring via TEMP pin, and precise enable thresholds for autonomous power-up sequencing in industrial and automotive control units.
Technical Context
The LTC3374AIFE#TRPBF integrates eight independent buck regulators sharing a common oscillator and MODE-controlled operating mode (Burst Mode® or forced continuous). Each channel supports independent VIN (2.25V–5.5V), 0.8V–VIN output range, and configurable phasing (90° offset) to reduce input ripple.
It implements precision feedback with ±1% VFB accuracy on Buck 1 and ±1.5% on Bucks 2–8, overvoltage indication at +7.5% above regulated VOUT, and die temperature monitoring via a linear 220mV/°C analog output on the TEMP pin-enabling real-time thermal management without external sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Count | Eight independent synchronous buck converters, each rated 1A continuous; configurable in 15 master/slave combinations up to 4A per rail. |
| Input Voltage Range | 2.25V to 5.5V per channel-supports wide-input industrial and automotive rails including 3.3V, 5V, and battery-backed supplies. |
| Output Voltage Accuracy | ±1% for Buck 1 (VFB = 800mV typ); ±1.5% for Bucks 2–8-enables tight-tolerance core and I/O rail generation. |
| Oscillator Frequency | 1MHz to 3MHz programmable via RT resistor or external SYNC signal; default 2MHz internal clock-allows EMI optimization and inductor size reduction. |
| Thermal Monitoring | TEMP pin outputs 220mV at 25°C with 7mV/°C slope-provides direct die temperature readout for thermal derating and fault detection. |
| Overvoltage Protection | Dedicated OV indicator triggers at +7.5% above regulated VOUT with 3% hysteresis-adds safety margin beyond standard PGOOD thresholds. |
| Package | 38-lead plastic TSSOP with exposed pad-supports high-power density layouts and meets AEC-Q100 Grade I (–40°C to +125°C junction). |
Pinout & Package
Package: 38-lead plastic TSSOP with exposed pad (Pin 39 = GND), thermally enhanced for operation up to 125°C junction temperature (θJA = 25°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1–EN8 | Active-high enable inputs | Independent control of each buck; precision thresholds (e.g., EN1 rising = 730mV typ) simplify autonomous sequencing without external logic. |
| FB1–FB8 | Feedback inputs | Close regulation loop; FB1 accuracy ±1% enables critical core rails; FB2–FB8 support parallel configurations when tied to adjacent VIN pins. |
| VIN1–VIN8 | Independent input supplies | Each accepts 2.25V–5.5V-enables mixed-rail designs (e.g., separate 3.3V and 5V inputs) and fault isolation between domains. |
| SW1–SW8 | Switch node outputs | Drive external inductors; phased 90° switching reduces input capacitor RMS current and EMI peak amplitude. |
| PGOOD_ALL | Open-drain status output | Asserts low if any enabled buck falls below 97% or exceeds 109% of target VOUT-single-point system health monitoring. |
| TEMP | Digital die temperature monitor | Analog voltage output (220mV @ 25°C, +7mV/°C) enables real-time thermal profiling and dynamic load throttling. |
| MODE | Global operating mode select | Low = Burst Mode® for light-load efficiency; high = forced continuous for low-noise, constant-frequency operation. |
| RT / SYNC | Oscillator control | RT sets frequency via resistor; SYNC accepts external clock (1–3MHz)-critical for noise-sensitive applications like ADC power domains. |
Key Features
| Feature | Design Value |
|---|---|
| Eight 1A synchronous bucks | Enables compact multirail power architecture-replaces eight discrete regulators while reducing board area and BOM count. |
| Master/slave configurability | 15 predefined combinations (e.g., 4×2A, 2×4A) using shared inductors-lowers component cost and improves current sharing accuracy vs. external current-sharing ICs. |
| AEC-Q100 qualified | Validated for automotive Grade I (–40°C to +125°C) operation-meets reliability requirements for ADAS, infotainment, and body control modules. |
| Phased 90° switching | Reduces input capacitor RMS current by ~30% vs. in-phase operation-extends capacitor lifetime and lowers required capacitance. |
| Precision enable thresholds | EN1 rising threshold = 730mV (typ), falling = 340mV (typ)-enables robust, resistor-based power-up sequencing without dedicated supervisors. |
| Integrated die temperature monitor | TEMP pin provides calibrated analog output-eliminates need for external thermal sensors in space-constrained automotive ECUs. |
Applications
| Automotive ADAS Domain Controller | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering vision processor cores, ISP, and SerDes interfaces in a front-camera ECU with strict thermal limits and multiple voltage domains. IC Role / Device Role / Timing Role: LTC3374AIFE#TRPBF delivers 1.0V/1.8V/3.3V rails from a 5V automotive bus, with Burst Mode® for standby and forced continuous during active imaging. Use Value: Phased switching cuts input ripple by 40%, enabling smaller bulk capacitors; TEMP pin allows dynamic CPU throttling before junction exceeds 125°C. | Use Scenario: Generating isolated 3.3V, 5V, and 12V auxiliary rails for digital I/O, analog sensor conditioning, and communication transceivers in a modular PLC backplane. IC Role / Device Role / Timing Role: LTC3374AIFE#TRPBF serves as primary multirail PMIC, with independent VIN supplies allowing separation of noisy digital and sensitive analog domains. Use Value: Independent enable pins (EN1–EN8) implement deterministic power-up sequence per I/O module slot; ±1% VFB ensures ADC reference stability across temperature. |
| 5G Small Cell Baseband Unit | Medical Imaging Sensor Array |
Use Scenario: Supplying FPGA fabric, DDR4 memory, and RF front-end bias in a thermally constrained outdoor small cell unit. IC Role / Device Role / Timing Role: LTC3374AIFE#TRPBF configures four 2A rails (via master/slave) for FPGA core and memory, while two 1A rails power RF synthesizers and ADC drivers. Use Value: 2MHz default switching frequency minimizes inductor size; SYNC pin allows synchronization to baseband clock to avoid beat frequencies in sensitive receive bands. | Use Scenario: Powering high-resolution CMOS image sensors and correlated double sampling (CDS) circuitry in portable ultrasound probes. IC Role / Device Role / Timing Role: LTC3374AIFE#TRPBF generates ultra-low-noise 1.2V and 2.5V rails with forced continuous mode and 90° phase shift to suppress switching artifacts in analog signal paths. Use Value: ±1% VFB accuracy maintains pixel gain linearity; PGOOD_ALL provides single-wire fault reporting to host MCU during probe self-test sequences. |
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#TRPBF | Same functionality and pinout, but in 5mm × 7mm QFN package with θJA = 34°C/W (vs. TSSOP's 25°C/W) | Better thermal performance in high-airflow environments; requires different PCB footprint and reflow profile | Select for higher ambient temperatures (>85°C) where TSSOP thermal resistance may limit power delivery. |
| TPS65270PWP | Triple-output (2×2A + 1×3A), no thermal monitor, no OV indicator, fixed 2.2MHz frequency, non-AEC-Q100 | Lacks die temperature sensing and overvoltage flag; limited to non-automotive industrial use | Choose only for cost-sensitive, non-automotive applications where thermal monitoring and safety flags are not required. |
Compared with LTC3374AEUHF#TRPBF, the LTC3374AIFE#TRPBF offers superior thermal resistance in TSSOP packaging for convection-cooled designs, while TPS65270PWP trades configurability and automotive qualification for lower unit cost in simpler three-rail systems.
Availability
LTC3374AIFE#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS controllers, industrial PLC I/O modules, and 5G small cell baseband units requiring stable component supply, AEC-Q100 compliance, and multirail power integration.
Supply support for LTC3374AIFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The LTC3374A product line delivers highly integrated, thermally robust multichannel DC/DC regulation for automotive and industrial systems demanding reliability, configurability, and real-time thermal awareness in compact form factors.
FAQ
What is the maximum output current achievable per rail using LTC3374AIFE#TRPBF?
The LTC3374AIFE#TRPBF supports up to 4A per rail by configuring four buck channels in master/slave mode with a shared inductor. This is confirmed in the datasheet's "Typical Application" diagram and electrical characteristics table (ILIM = 7.2A max for 4-buck combination). The actual achievable current depends on thermal design, inductor DCR, and ambient conditions-but 4A is the rated limit under specified junction temperature constraints.
Does LTC3374AIFE#TRPBF support synchronization to an external clock?
Yes, LTC3374AIFE#TRPBF supports external clock synchronization via the SYNC pin, accepting input frequencies from 1MHz to 3MHz. When driven by an external oscillator, the internal slope compensation automatically adapts to maintain stability. The SYNC pin must be pulled to ground if unused-floating is prohibited per the Absolute Maximum Ratings table.
How does the TEMP pin on LTC3374AIFE#TRPBF function, and what is its accuracy?
The TEMP pin on LTC3374AIFE#TRPBF outputs a linear analog voltage: 220mV at 25°C with a slope of 7mV/°C (typical). This provides direct measurement of die temperature without external components. Datasheet Figure G10 shows ±10°C accuracy across –40°C to +125°C, enabling reliable thermal derating and overtemperature warning before shutdown.
Can LTC3374AIFE#TRPBF operate with different input voltages on each channel?
Yes, LTC3374AIFE#TRPBF is explicitly designed for independent input supplies: VIN1–VIN8 each accept 2.25V to 5.5V, allowing mixed-rail architectures (e.g., VIN1 = 3.3V for core logic, VIN2 = 5V for interface drivers). This is stated in the "Description" section and validated in the Absolute Maximum Ratings and Electrical Characteristics tables.
What is the purpose of the MODE pin on LTC3374AIFE#TRPBF, and how does it affect efficiency?
The MODE pin on LTC3374AIFE#TRPBF selects global operating mode: low = Burst Mode® (high light-load efficiency, variable frequency), high = forced continuous mode (fixed frequency, lower noise). Efficiency gains in Burst Mode® exceed 20% at 1mA load (per Figure G24), making it ideal for standby states-while forced continuous ensures clean power for noise-sensitive analog circuits.
LTC3374AIFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3374AIFE#TRPBF FAQ
1.How can I place an order for LTC3374AIFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374AIFE#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 LTC3374AIFE#TRPBF reliable?
The price and inventory of LTC3374AIFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374AIFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3374AIFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374AIFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374AIFE#TRPBF?
LTC3374AIFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374AIFE#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 LTC3374AIFE#TRPBF?
For technical support, including LTC3374AIFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374AIFE#TRPBF requirements.
6.How does Aetrix verify that LTC3374AIFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3374AIFE#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 LTC3374AIFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3374AIFE#TRPBF?
All LTC3374AIFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374AIFE#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 LTC3374AIFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3374AIFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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