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Analog Devices Inc. LTC3374IFE
- Part No.:
- LTC3374IFE
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3374IFE.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,931
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Product details
Overview
LTC3374IFE from Analog Devices is an octal-channel, configurable high-efficiency PMIC with eight 1 A synchronous buck regulators, supporting up to eight independent output rails or parallel configurations totaling 8 A. It operates from a 2.25 V to 5.5 V input and delivers output voltages from 0.8 V to VIN. Designed for space-constrained industrial and automotive infotainment systems requiring flexible rail generation without redesign.
For engineers reviewing the LTC3374IFE datasheet, LTC3374IFE pinout, LTC3374IFE application, or LTC3374IFE equivalent, key selection criteria include its 38-lead QFN package, pin-strappable configuration (CFG0–CFG3), ±1% output voltage accuracy, integrated current monitoring (IMONx), and thermal shutdown at 165°C - all critical for multirail power integrity in compact embedded designs.
Technical Context
The LTC3374IFE integrates eight independent 1 A buck power stages with internal MOSFETs, enabling 15 distinct output current configurations via CFG0–CFG3 pins. Each channel supports adjustable output voltage down to 0.8 V using external feedback resistors and features differential sensing, soft-start, and short-circuit protection.
It operates in Burst Mode® for ultra-low quiescent current (63 µA with one channel enabled) or forced continuous PWM for low-noise operation. The device includes dedicated RUNx pins for independent sequencing, PGOODx status outputs, IMONx current monitor outputs, and a die temperature monitor accessible via the TEMP pin (10 mV/°C scaling).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25 V to 5.5 V - supports single-cell Li-ion, USB PD, and 3.3 V/5 V system rails without external LDO pre-regulation. |
| Total Output Current | Up to 8 A - achieved by combining up to eight 1 A stages into 1–8 output configurations (e.g., 4 × 2 A, 2 × 4 A, or 1 × 8 A). |
| Output Voltage Range | 0.8 V to VIN - enables direct regulation of core logic, I/O, and memory rails without external dividers or post-regulators. |
| Output Accuracy | ±1% - ensures stable voltage margins for sensitive digital loads like FPGAs and microcontrollers under load/temperature variation. |
| Switching Frequency | 1 MHz to 3 MHz (programmable) - allows optimization of inductor size vs. EMI; default 2 MHz balances efficiency and component footprint. |
| Quiescent Current | 63 µA (1 channel active) - extends battery life in always-on subsystems such as automotive body controllers or sensor hubs. |
| Thermal Shutdown | 165°C (typical) - protects IC and PCB during overload or poor heatsinking; auto-recovery at 155°C prevents latch-up. |
Pinout & Package
The LTC3374IFE is housed in a thermally enhanced 38-lead QFN package (5 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad (EPAD) for efficient heat dissipation in high-current applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–VING | Input supply pins (7 total) | Dedicated inputs per buck stage group - enable independent sourcing (e.g., separate noisy/sensitive rails) and reduce shared impedance coupling. |
| SWA–SWH | Switch node outputs (8 total) | Connect directly to external inductors - each SW pin drives one 1 A buck stage; layout symmetry minimizes loop inductance. |
| FB1–FB8 | Feedback inputs (8 total) | Resistor-divider inputs for output voltage setting - differential sensing (FBx+/FBx−) rejects PCB noise and improves regulation accuracy. |
| PGOOD1–PGOOD8 | Power-good status outputs (8 total) | Open-drain signals indicating ±7.5% output tolerance - used for system-level power sequencing and fault isolation. |
| IMON1–IMON8 | Current monitor outputs (8 total) | Analog current sources proportional to average load current (1 µA/mA) - enables real-time load profiling and overcurrent detection without sense resistors. |
| RUN1–RUN8 | Enable/sequencing inputs (8 total) | Logic-level inputs with precise thresholds (0.95 V/1.25 V) - support staggered startup, reset coordination, and dynamic rail enable/disable. |
| CFG0–CFG3 | Configuration select inputs | 4-pin binary code selects one of 15 output topologies - no firmware or I²C required; hardware-configured flexibility accelerates prototyping. |
| TEMP | Die temperature monitor | Analog voltage output (10 mV/°C) - allows system MCU to read junction temperature for thermal management without external sensors. |
Key Features
| Feature | Design Value |
|---|---|
| Eight 1 A synchronous buck stages | Enables scalable rail count (1–8 outputs) and current (1–8 A) without changing BOM or layout - eliminates need for multiple discrete regulators. |
| Pin-strappable 15-output configurations | Hardware-defined topology selection avoids firmware dependencies and boot-time delays - ideal for safety-critical or resource-constrained systems. |
| Integrated current monitors (IMONx) | Eliminates 8 external current-sense resistors and associated layout area - reduces bill-of-materials cost and improves measurement accuracy vs. discrete solutions. |
| Differential feedback (FBx+/FBx−) | Rejects PCB trace noise and ground bounce - maintains ±1% regulation accuracy even in electrically noisy automotive or industrial environments. |
| Thermal monitoring + shutdown (TEMP + OT) | Provides dual-layer thermal protection: analog die temp readback for predictive throttling and hard shutdown at 165°C to prevent catastrophic failure. |
Applications
| Automotive Infotainment | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Central display unit with GPU, touch controller, audio codec, and USB peripherals requiring isolated 1.8 V, 3.3 V, and 5 V rails. IC Role / Device Role / Timing Role: Configurable PMIC generating eight independent low-noise supplies with precise sequencing and fault reporting. Use Value: Replaces six discrete buck ICs and associated passives; reduces solution area by >40% while enabling real-time current monitoring per rail. | Use Scenario: Modular I/O base with mixed analog/digital sensors, isolated RS-485 transceivers, and microcontroller subsystems. IC Role / Device Role / Timing Role: Single-chip power source delivering 3.3 V for logic, 5 V for analog front-end, and 12 V bias (via external boost) with coordinated startup. Use Value: Eliminates manual resistor selection for voltage setting; CFG pins allow field reconfiguration for different module variants without PCB change. |
| Medical Patient Monitor | Edge AI Sensor Hub |
Use Scenario: Portable vital signs monitor with ECG, SpO₂, and display requiring low-quiescent, low-noise, and thermally robust power. IC Role / Device Role / Timing Role: Primary power manager providing 1.2 V for ARM Cortex-M7, 1.8 V for ADC/DAC, and 3.3 V for wireless BLE module. Use Value: 63 µA quiescent current extends battery runtime; TEMP pin enables firmware-based thermal derating before shutdown occurs. | Use Scenario: Compact vision-based sensor node with image sensor, AI accelerator, and LoRaWAN radio operating from lithium primary cell. IC Role / Device Role / Timing Role: High-efficiency multirail generator supporting burst-mode operation during sleep and forced PWM during inference cycles. Use Value: Dual-mode switching preserves battery life while maintaining clean power during high-speed data acquisition and processing. |
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 |
|---|---|---|---|
| LTC3374AIFE | Same pinout and 15-configuration architecture; improved ±0.5% output accuracy and lower 28 µA quiescent current (1 channel). | Better suited for precision analog subsystems or ultra-low-power always-on nodes where tighter regulation and lower IQ are critical. | Select LTC3374AIFE when ±0.5% output accuracy and sub-30 µA IQ outweigh cost sensitivity; otherwise LTC3374IFE remains optimal for general-purpose multirail use. |
| LTC3375IUF | 48-lead QFN, 48-ball BGA-compatible footprint; adds I²C interface for dynamic configuration and telemetry, but lacks IMONx analog current monitors. | Ideal for systems requiring runtime reconfiguration (e.g., adaptive power profiles) and host MCU telemetry, but requires firmware integration and sacrifices analog current visibility. | Choose LTC3375IUF only if I²C programmability justifies added software complexity and loss of standalone IMON functionality. |
Compared with LTC3374AIFE and LTC3375IUF, the LTC3374IFE offers the best balance of hardware configurability, analog monitoring fidelity, and cost-effectiveness for fixed-function multirail systems - especially where deterministic startup, minimal firmware dependency, and real-time current visibility are design priorities.
Availability
LTC3374IFE is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and portable medical devices requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3374IFE 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3374IFE belongs to ADI's Power by Linear™ configurable PMIC family, designed specifically to replace discrete buck regulators in feature-rich embedded systems where board space, thermal management, and power rail flexibility are critical constraints.
FAQ
What is the maximum total output current supported by the LTC3374IFE?
The LTC3374IFE supports a maximum total output current of 8 A, achieved by paralleling its eight internal 1 A synchronous buck stages. This is realized across 15 possible configurations - including single-rail 8 A, dual-rail 4 A+4 A, quad-rail 2 A×4, or octal-rail 1 A×8 - all selectable via the CFG0–CFG3 pins without firmware or external components. The LTC3374IFE maintains ±1% output voltage accuracy across all configurations and load ranges.
Does the LTC3374IFE require external bootstrap capacitors?
No, the LTC3374IFE does not require external bootstrap capacitors. Its internal architecture integrates high-side gate drive circuitry with on-die charge pumps, eliminating the need for external BST caps. This simplifies layout, reduces component count, and improves reliability - particularly in space-constrained applications like automotive head units or portable medical devices where the LTC3374IFE is commonly deployed.
How does the LTC3374IFE handle thermal management?
The LTC3374IFE incorporates dual thermal protection: a die temperature monitor (TEMP pin, 10 mV/°C) for real-time junction temperature readback, and automatic overtemperature shutdown at 165°C (typical). When triggered, all enabled buck regulators halt switching and remain off until die temperature falls to ~155°C. This prevents irreversible damage during sustained overload or inadequate heatsinking - a critical safeguard in sealed industrial enclosures where the LTC3374IFE powers multiple subsystems.
Can the LTC3374IFE be used with input voltages below 2.25 V?
No, the LTC3374IFE has a specified minimum input voltage of 2.25 V. Operation below this threshold is not guaranteed and may result in improper regulation, missing PGOOD assertion, or uncontrolled shutdown. For sub-2.25 V applications - such as single alkaline or NiMH battery systems - alternative regulators like the LTC3371 or discrete low-VIN buck converters must be considered. The LTC3374IFE is optimized for 2.25 V–5.5 V sources including Li-ion, USB, and regulated 3.3 V/5 V rails.
What is the purpose of the IMONx pins on the LTC3374IFE?
The IMONx pins (IMON1–IMON8) on the LTC3374IFE provide analog current monitor outputs, each sourcing a current proportional to its corresponding buck regulator's average load current (1 µA per 1 mA of load). These pins eliminate the need for external current-sense resistors and associated op-amps, enabling accurate real-time load profiling, overcurrent detection, and power budgeting - essential functions in automotive infotainment and industrial control systems where the LTC3374IFE is deployed.
LTC3374IFE 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3374IFE FAQ
1.How can I place an order for LTC3374IFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374IFE 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 LTC3374IFE reliable?
The price and inventory of LTC3374IFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374IFE is usually 5 days.
3.What payment methods are accepted for LTC3374IFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374IFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374IFE?
LTC3374IFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374IFE 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 LTC3374IFE?
For technical support, including LTC3374IFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374IFE requirements.
6.How does Aetrix verify that LTC3374IFE is sourced from the original manufacturer or authorized distributors?
All LTC3374IFE 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 LTC3374IFE meets industry standards.
7.What is the process for return or replacement of LTC3374IFE?
All LTC3374IFE units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374IFE, 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 LTC3374IFE part is unused and in its original packaging.
Return procedure for LTC3374IFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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