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Analog Devices Inc. LTC3374AIUHF#TRPBF
- Part No.:
- LTC3374AIUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3374AIUHF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LTC3374AIUHF#TRPBF from Analog Devices is a high-accuracy, 8-channel parallelable 1A synchronous buck DC/DC converter IC. It integrates eight independent 1A buck regulators powered from separate 2.25V–5.5V inputs, supports master-slave configurations up to 4A per output with shared inductors, and delivers ±1% VFB accuracy on Buck 1 and ±1% PGOOD accuracy across all channels. It is used in multichannel power supplies for automotive infotainment and industrial control systems requiring precise voltage regulation and thermal monitoring.
For engineers reviewing the LTC3374AIUHF#TRPBF datasheet, LTC3374AIUHF#TRPBF pinout, LTC3374AIUHF#TRPBF application, or LTC3374AIUHF#TRPBF equivalent, key selection criteria include its 38-lead 5mm × 7mm QFN package, programmable 1MHz–3MHz oscillator, ±1% feedback accuracy on Buck 1, die temperature monitor (TEMP pin), and AEC-Q100 qualification for automotive use.
Technical Context
The LTC3374AIUHF#TRPBF implements eight independent synchronous buck converters with phase-shifted 90° switching to reduce input ripple. Each channel features precision enable thresholds (400mV rising, 300mV falling) enabling autonomous power-up sequencing without external controllers.
Its MODE pin selects between Burst Mode® operation (for light-load efficiency) and forced continuous conduction mode. The RT pin programs oscillator frequency from 1MHz to 3MHz, while SYNC allows external clock synchronization. An overvoltage indicator triggers at 107.5% of regulated VOUT with 3% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per buck channel - supports wide-input industrial and automotive supply rails. |
| Output Current per Channel | Up to 1A - scalable to 2A/3A/4A via master-slave parallel configuration using shared inductors. |
| Feedback Accuracy (Buck 1) | ±1% (792mV to 808mV) - enables tight regulation for sensitive digital loads like FPGAs and SoCs. |
| Oscillator Frequency | Programmable 1MHz–3MHz (2MHz default) - balances efficiency, size, and EMI in compact layouts. |
| Thermal Monitoring | TEMP pin outputs 220mV at 25°C with 7mV/°C slope - provides real-time die temperature for system-level thermal management. |
| Overvoltage Detection | 107.5% VOUT threshold with 3% hysteresis - protects downstream circuitry from transient overvoltage events. |
| Package | 38-lead 5mm × 7mm QFN with exposed pad - optimized for thermal dissipation in high-density automotive PCBs. |
Pinout & Package
The LTC3374AIUHF#TRPBF is housed in a thermally enhanced 38-lead 5mm × 7mm plastic QFN package with an exposed ground pad (Pin 39) that must be soldered to the PCB for electrical integrity and thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 | Feedback input for buck regulators 1–8 | Connects to resistor divider to set output voltage; FB2–FB8 tied to VINx to configure master-slave combinations. |
| VIN1–VIN8 | Independent input supply pins | Each powers one buck channel; shorting adjacent VIN pins enables current sharing (e.g., VIN2 to VIN1 for 2A). |
| SW1–SW8 | Switch node outputs | Drive external inductors; phase-shifted 90° switching reduces input capacitor RMS current. |
| EN1–EN8 | Active-high enable inputs | Enable individual bucks; precision thresholds (400mV rise / 300mV fall) support autonomous sequencing. |
| PGOOD_ALL | Open-drain global power-good status | Asserts low if any enabled buck's output falls below 97% or exceeds 109% of target - simplifies system fault detection. |
| TEMP | Digital die temperature monitor | Outputs 220mV at 25°C + 7mV/°C - enables closed-loop thermal throttling without external sensors. |
| MODE | Operating mode select | Low = Burst Mode® (high light-load efficiency); High = forced continuous mode (low noise, fixed frequency). |
| RT | Oscillator frequency programming | Resistor-to-ground sets fSW from 1MHz–3MHz; tie to VCC for 2MHz default. |
Key Features
| Feature | Design Value |
|---|---|
| Eight 1A synchronous bucks | Enables compact, isolated power domains for multi-rail SoC/FPGA systems without discrete PMICs. |
| Master-slave parallel capability | Supports 15 distinct channel groupings (e.g., 4×1A, 2×2A, 1×4A) using shared inductors - reduces BOM count and board area. |
| ±1% VFB accuracy (Buck 1) | Meets tight regulation requirements for core voltages in automotive ADAS processors and industrial PLCs. |
| AEC-Q100 qualified | Rated for –40°C to 125°C junction temperature - validated for under-hood automotive applications. |
| Dual-mode operation (Burst/FCM) | Optimizes efficiency across load range: >85% at 1mA, >92% at full 1A load - extends battery life in always-on modules. |
Applications
| Automotive Infotainment | Industrial PLC Power Management |
|---|---|
Use Scenario: Powering multiple voltage rails (1.2V, 1.8V, 3.3V, 5V) for SoC, DDR, display, and audio subsystems in head units. IC Role / Device Role / Timing Role: Multichannel buck regulator providing independent, sequenced, and monitored DC/DC conversion. Use Value: Eliminates need for four discrete buck ICs; AEC-Q100 rating ensures reliability in vehicle cabin environments. | Use Scenario: Generating isolated 3.3V and 5V rails for microcontroller, I/O, and communication interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Centralized power management IC delivering stable, thermally tracked outputs with autonomous startup sequencing. Use Value: Reduces component count by 60% vs. discrete solutions; TEMP pin enables predictive thermal derating during high-duty-cycle operation. |
| Communications Baseband | Medical Imaging Sensor Array |
Use Scenario: Supplying clean, low-noise bias voltages to RF transceivers, ADCs, and clock buffers in small-cell base stations. IC Role / Device Role / Timing Role: Precision-regulated, phase-shifted buck controller minimizing input ripple and EMI coupling. Use Value: 90° interleaving cuts input capacitor RMS current by ~30%, allowing smaller ceramic capacitors and lower cost. | Use Scenario: Powering distributed analog front-end sensor nodes (e.g., CT/MRI detector arrays) requiring matched, low-drift rails. IC Role / Device Role / Timing Role: Eight-channel synchronized regulator with ±1% VFB accuracy ensuring consistent signal chain performance. Use Value: Tight output matching (<±10mV across channels) minimizes gain error in multi-channel ADC acquisition paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3374EUHF#TRPBF | Same architecture and pinout, but rated for 0°C to 85°C junction temperature (not AEC-Q100 qualified). | Suitable only for commercial-grade applications; not validated for automotive thermal cycling or long-term reliability. | Select when operating environment stays within 0°C–85°C and automotive qualification is unnecessary. |
| TPS65218D0RSLR | 6-channel buck (max 3A total), integrated LDOs, I²C interface, no TEMP pin or master-slave parallel mode. | Targeted at TI-based AM335x/AM437x SoCs; lacks independent VIN per channel and die temperature monitoring. | Choose for TI processor reference designs where I²C configurability outweighs thermal visibility and channel independence. |
Compared with LTC3374EUHF#TRPBF and TPS65218D0RSLR, the LTC3374AIUHF#TRPBF uniquely combines AEC-Q100 qualification, per-channel input flexibility, and real-time die temperature sensing - critical for automotive and high-reliability industrial deployments where thermal margin and supply isolation are design constraints.
Availability
LTC3374AIUHF#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, and communications baseband equipment requiring stable component supply, long lifecycle support, and AEC-Q100 compliance.
Supply support for LTC3374AIUHF#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.
The LTC3374A product line delivers highly integrated, thermally robust multichannel DC/DC solutions designed specifically for space-constrained automotive and industrial applications demanding precision regulation, flexible power sequencing, and built-in diagnostics.
FAQ
What is the operating temperature range for the LTC3374AIUHF#TRPBF?
The LTC3374AIUHF#TRPBF is specified for an operating junction temperature range of –40°C to 125°C and is AEC-Q100 qualified for automotive applications. Its thermal performance relies on proper soldering of the exposed pad (Pin 39) to a PCB ground plane, achieving θJA = 34°C/W in the 5mm × 7mm QFN package. This rating ensures reliable operation in under-dash automotive environments and harsh industrial settings.
How does the LTC3374AIUHF#TRPBF support master-slave parallel configurations?
The LTC3374AIUHF#TRPBF supports master-slave parallel operation by connecting FBx pins to adjacent VINy pins (e.g., FB2 to VIN2) and shorting corresponding VIN pins (e.g., VIN2 to VIN1). This configures two or more bucks to share a single inductor and deliver up to 4A total output. The IC supports 15 distinct grouping combinations, and all paralleled channels maintain synchronized 90° phase-shifted switching to minimize input ripple.
What is the function of the TEMP pin on the LTC3374AIUHF#TRPBF?
The TEMP pin on the LTC3374AIUHF#TRPBF outputs a voltage proportional to the internal die temperature: 220mV at 25°C with a slope of 7mV/°C (typical). This analog output enables real-time thermal monitoring without external sensors. To disable the monitor and save ~12µA of VCC quiescent current, tie TEMP directly to VCC. The pin is not intended for closed-loop control but provides critical insight for system-level thermal management decisions.
Does the LTC3374AIUHF#TRPBF support external clock synchronization?
Yes, the LTC3374AIUHF#TRPBF supports external clock synchronization via the SYNC pin. Driving SYNC with a clean CMOS clock signal (1MHz–3MHz, tLOW/tHIGH > 40ns) synchronizes all eight buck regulators to the external frequency. The IC automatically adjusts slope compensation to match the applied clock, maintaining stability. When unused, SYNC must be tied to ground - floating the pin is prohibited per the absolute maximum ratings.
What are the key differences between the LTC3374AIUHF#TRPBF and the original LTC3374?
The LTC3374AIUHF#TRPBF is an upgraded pin-compatible version of the LTC3374, featuring higher efficiency across load ranges, improved output voltage accuracy (±1% VFB on Buck 1), and an added overvoltage (OV) indicator with 107.5% threshold and 3% hysteresis. It retains identical pinout, package, and functional architecture but delivers enhanced performance for next-generation automotive and industrial power systems requiring tighter regulation and fault coverage.
LTC3374AIUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN 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-QFN (5x7)
LTC3374AIUHF#TRPBF FAQ
1.How can I place an order for LTC3374AIUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374AIUHF#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 LTC3374AIUHF#TRPBF reliable?
The price and inventory of LTC3374AIUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374AIUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3374AIUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374AIUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374AIUHF#TRPBF?
LTC3374AIUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374AIUHF#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 LTC3374AIUHF#TRPBF?
For technical support, including LTC3374AIUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374AIUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3374AIUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3374AIUHF#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 LTC3374AIUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3374AIUHF#TRPBF?
All LTC3374AIUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374AIUHF#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 LTC3374AIUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3374AIUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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