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Analog Devices Inc. LTC3374AIFE
- Part No.:
- LTC3374AIFE
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3374AIFE.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,065
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Product details
Overview
LTC3374AIFE from Analog Devices is a configurable 8-channel, 20 V input PMIC with eight 1.5 A power stages supporting up to eight independent buck outputs or parallel combinations (e.g., 4 × 3 A), delivering total output current up to 12 A. It features ±1% output voltage accuracy, 1 MHz–3 MHz programmable switching frequency, and operates from –40°C to +125°C junction temperature-used in automotive infotainment and industrial control power rails.
For engineers reviewing the LTC3374AIFE datasheet, LTC3374AIFE pinout, LTC3374AIFE application, or LTC3374AIFE equivalent, key selection considerations include its 38-lead QFN package, CFG0–CFG3 pin-strappable configuration of 15 output current topologies, integrated BST capacitors, and die temperature monitoring via analog TEMP pin voltage.
Technical Context
The LTC3374AIFE integrates eight synchronous buck power stages with independent channel enable/control, configurable via four CFG pins to select among 15 fixed current allocations (e.g., 1×12 A, 2×6 A, 4×3 A, or 8×1.5 A). Each stage supports 0.4 V to 0.83×VIN output range and uses internal compensation requiring only external feedback resistors.
It operates in Burst Mode® for ultralow quiescent current (28 µA with one channel active) or forced continuous PWM for low-noise operation. Safety features include per-channel PGOOD status, IMON current monitor outputs, overtemperature shutdown at 165°C (typ), and die temperature readout via TEMP pin (10 mV/°C scaling).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 20 V - supports 12 V and 18 V wall adapters and automotive battery inputs without external pre-regulation. |
| Total Output Current | Up to 12 A - achieved by combining eight 1.5 A stages in parallel configurations (e.g., 4×3 A), enabling scalable rail design. |
| Output Voltage Accuracy | ±1% - ensures stable core voltage delivery for FPGAs, microprocessors, and ASICs under load and temperature variation. |
| Switching Frequency | 1 MHz to 3 MHz - programmable via RT resistor; 2 MHz default enables compact magnetics and reduced EMI filtering area. |
| Quiescent Current | 28 µA (1 channel active) - extends battery life in always-on subsystems such as automotive body controllers or IoT edge nodes. |
| Operating Temperature | –40°C to +125°C (junction) - qualified for under-hood automotive and industrial environments without derating. |
| DIE Temp Monitoring | Analog TEMP pin (10 mV/°C) - enables real-time thermal management in closed-loop systems without external sensors. |
Pinout & Package
The LTC3374AIFE is housed in a thermally enhanced 38-lead QFN package (5 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Analog Devices' official datasheet DS3374AFA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–VING | Input voltage supply pins (7 total) | Accept 3 V–20 V input; distributed across multiple pins to reduce IR drop and improve thermal spreading. |
| SWA–SWH | Switch node outputs (8 total) | Drive external inductors; each connects to one 1.5 A power stage; layout symmetry critical for current sharing. |
| CFG0–CFG3 | Configuration select inputs | Binary-coded strapping pins that define one of 15 output current topologies (e.g., 4×3 A or 8×1.5 A). |
| PGOOD1–PGOOD8 | Power-good status outputs | Open-drain signals indicating regulated output within ±7.5% of target; used for sequencing and fault isolation. |
| IMON1–IMON8 | Current monitor outputs | Analog current sources (1 µA/mA) proportional to average channel load-enables system-level current telemetry. |
| TEMP | Die temperature monitor | Analog voltage output (10 mV/°C) referenced to GND; allows direct microcontroller ADC reading of junction temperature. |
| RT | Frequency setting resistor | Connects to GND to set switching frequency from 1 MHz to 3 MHz; determines inductor size and efficiency trade-off. |
| GND / EXPOSED PAD | Ground reference & thermal path | Primary thermal conduction path; must be soldered to large PCB copper area for <15°C/W θJA performance. |
Key Features
| Feature | Design Value |
|---|---|
| Eight 1.5 A configurable power stages | Enables flexible rail count vs. current trade-offs (e.g., 8×1.5 A, 4×3 A, or 2×6 A) without changing BOM or layout. |
| Integrated BST capacitors | Eliminates 8 external boost capacitors, reducing component count, board area, and potential EMI coupling paths. |
| Burst Mode® operation | Achieves 28 µA IQ with one channel active-critical for always-on automotive modules meeting ISO 16750-2 quiescent current limits. |
| Per-channel IMON and PGOOD | Supports real-time load monitoring and autonomous fault response in safety-critical systems like ADAS domain controllers. |
| Dual-mode thermal protection | Combines analog TEMP readout (for predictive thermal throttling) and hard OT shutdown at 165°C (typ) for fail-safe operation. |
Applications
| Automotive Infotainment | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Powering multi-rail SoC, display interface, USB PHY, and audio codec in a head-unit with space-constrained 4-layer PCB. IC Role / Device Role / Timing Role: Configurable PMIC providing 5 V (3 A), 3.3 V (3 A), 1.8 V (3 A), and 1.2 V (3 A) simultaneously from 12 V battery input. Use Value: Single-chip solution replaces four discrete buck regulators, reducing solution footprint by >40% and eliminating inter-rail sequencing complexity. |
Use Scenario: Supplying isolated sensor front-ends, FPGA configuration, CAN transceiver, and microcontroller in modular I/O base unit. IC Role / Device Role / Timing Role: Eight-rail generator delivering 3.3 V (2×1.5 A), 2.5 V (2×1.5 A), 1.8 V (2×1.5 A), and 1.2 V (2×1.5 A) with independent enable control. Use Value: Pin-strapped configuration avoids firmware dependency; PGOOD signals feed into PLC watchdog logic for deterministic power-up verification. |
| Medical Imaging Subsystem | Test & Measurement Equipment |
|
Use Scenario: Powering high-speed ADCs, FPGA-based image processing, and LED backlight drivers in portable ultrasound probe electronics. IC Role / Device Role / Timing Role: Four 3 A outputs (5 V, 3.3 V, 2.5 V, 1.8 V) generated using parallel-stage topology with shared inductors to minimize EMI-sensitive analog section noise. Use Value: Burst Mode® operation maintains <30 µA system standby current while preserving fast wake-up response for on-demand imaging. |
Use Scenario: Supporting multichannel data acquisition FPGA, precision DACs, reference buffers, and USB-C PD controller in benchtop DMM platform. IC Role / Device Role / Timing Role: Configured as 8×1.5 A to independently power eight signal-chain channels with matched rail timing and low cross-talk. Use Value: IMON outputs feed back to host MCU for real-time per-channel load profiling-enabling dynamic power budgeting and thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar configurable multi-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3376 | Higher input voltage (3 V–20 V), 64-ball 7 mm × 7 mm BGA, 12 A total with four 3 A stages; includes EXTVCC and SYNC/MODE pin. | Preferred for space-constrained, high-input-voltage designs where thermal performance via flip-chip BGA is prioritized over manual assembly. | Select LTC3376 when board-level reflow capability supports BGA and system requires >5.5 V input or higher per-rail current (>3 A). |
| LTC3375 | Same 38-lead QFN package as LTC3374AIFE but adds I²C interface; supports 48-lead QFN variant; identical 8×1.5 A architecture and 15 configurations. | Suitable where digital configuration and dynamic reprogramming during operation are required (e.g., field-upgradable test equipment). | Choose LTC3375 if firmware-controlled rail reconfiguration or telemetry reporting via I²C is needed-LTC3374AIFE lacks serial interface. |
Compared with LTC3376 and LTC3375, the LTC3374AIFE offers identical 8-channel 1.5 A stage architecture and pin-strappable configurability in a hand-solderable QFN, but omits I²C and EXTVCC-making it optimal for cost-sensitive, fixed-function automotive and industrial power blocks where analog control suffices.
Availability
LTC3374AIFE is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and medical imaging subsystems requiring stable component supply, long lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3374AIFE 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3374AIFE belongs to ADI's Power by Linear™ configurable PMIC family, designed specifically for multirail, high-current, space-constrained power delivery in automotive and industrial systems where flexibility, thermal robustness, and minimal external components are essential.
FAQ
What is the maximum input voltage supported by the LTC3374AIFE?
The LTC3374AIFE supports an input voltage range of 3 V to 20 V. This allows direct operation from common automotive battery rails (12 V nominal, up to 16 V transient) and industrial 18 V wall adapters without pre-regulation. The 20 V absolute maximum rating provides margin against load dump events in automotive environments, and all internal circuitry-including gate drivers and bias supplies-is rated for this full range.
How many output configurations does the LTC3374AIFE support, and how are they selected?
The LTC3374AIFE supports 15 distinct output current configurations-from single 12 A output to eight independent 1.5 A rails-selected via binary coding on CFG0 through CFG3 pins. These pins are strapped to VCC or GND at power-up; no software or I²C interface is required. Configuration mapping is fixed and documented in the LTC3374A datasheet Table 1, ensuring deterministic behavior across temperature and voltage.
Does the LTC3374AIFE include integrated boost capacitors?
Yes, the LTC3374AIFE integrates all necessary BST (bootstrap) capacitors internally. This eliminates the need for eight external ceramic capacitors typically required for gate drive in multi-phase buck controllers. The integration reduces component count, PCB area, and potential EMI coupling paths-particularly beneficial in dense automotive and industrial layouts where layout parasitics impact stability.
What thermal protection mechanisms are implemented in the LTC3374AIFE?
The LTC3374AIFE implements dual thermal safeguards: first, an analog TEMP pin outputs a voltage scaled at 10 mV/°C for real-time die temperature monitoring by an external ADC; second, a hardware overtemperature shutdown activates at 165°C (typical), disabling all enabled buck stages until die temperature falls to 155°C (typical). Both functions operate independently of software or external supervision.
Is the LTC3374AIFE pin-compatible with other members of the LTC337x family?
No, the LTC3374AIFE is not pin-compatible with LTC3376 (64-ball BGA) or LTC3375 (48-lead QFN option); however, it shares identical pinout and footprint with LTC3374 (same 38-lead QFN package). Differences between LTC3374 and LTC3374AIFE are limited to internal enhancements-such as improved thermal performance and tighter output voltage accuracy-without changes to pin function or mechanical dimensions.
LTC3374AIFE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LTC3374AIFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374AIFE 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 reliable?
The price and inventory of LTC3374AIFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374AIFE is usually 5 days.
3.What payment methods are accepted for LTC3374AIFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374AIFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374AIFE?
LTC3374AIFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374AIFE 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?
For technical support, including LTC3374AIFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374AIFE requirements.
6.How does Aetrix verify that LTC3374AIFE is sourced from the original manufacturer or authorized distributors?
All LTC3374AIFE 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 meets industry standards.
7.What is the process for return or replacement of LTC3374AIFE?
All LTC3374AIFE units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374AIFE, 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 part is unused and in its original packaging.
Return procedure for LTC3374AIFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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