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Analog Devices Inc. LTC3374EFE
- Part No.:
- LTC3374EFE
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3374EFE.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,223
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Product details
Overview
LTC3374EFE from Analog Devices is an octal-output, configurable power management IC with eight 1 A synchronous buck power stages, supporting up to eight independent low-voltage rails (0.8 V to VIN) from a 2.25 V to 5.5 V input. It delivers total output current up to 8 A across 15 pin-strappable configurations and integrates precision RUN thresholds, PGOOD monitoring, and die temperature sensing for automotive and industrial systems requiring stable multirail power.
For engineers reviewing the LTC3374EFE datasheet, LTC3374EFE pinout, LTC3374EFE application, or LTC3374EFE equivalent, this page provides verified configuration options, thermal performance data, current monitor accuracy, sequencing behavior, and real-world substitution guidance for multichannel PMIC selection in space-constrained embedded designs.
Technical Context
The LTC3374EFE implements eight independent 1 A buck power stages arranged in four dual-stage blocks, each configurable via CFG0–CFG3 pins to assign current per output (1 A, 2 A, or combinations up to 4 A per rail). It uses internal compensation and fixed-frequency PWM (1 MHz to 3 MHz, default 2 MHz) with optional synchronization.
All outputs support adjustable voltage down to 0.8 V using external feedback resistors; each includes differential remote sense, soft-start, short-circuit protection, and individual PGOOD and IMON pins. The device operates from –40°C to +125°C junction temperature and features integrated BST capacitors-no external boost caps required.
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 - distributed across 1 to 8 outputs via pin-strapped configurations (e.g., 4 × 2 A, 2 × 4 A, or 8 × 1 A). |
| Output Voltage Range | 0.8 V to VIN - enables direct regulation of core voltages for FPGAs, microcontrollers, and ASICs without intermediate conversion. |
| Switching Frequency | 1 MHz to 3 MHz (default 2 MHz) - balances efficiency and EMI; synchronizable to external clock for noise-sensitive applications. |
| Quiescent Current | 63 µA (1 channel enabled) - minimizes standby power loss in always-on automotive and industrial modules. |
| Die Temperature Monitoring | Analog TEMP pin output (10 mV/°C) - enables host MCU to read junction temperature directly for thermal throttling or fault logging. |
| Operating Junction Temp | –40°C to +125°C - qualified for under-hood automotive and high-temperature industrial environments. |
Pinout & Package
The LTC3374EFE is housed in a 38-lead QFN package (5 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are validated per Analog Devices' official datasheet DS3374EFE-1-191018.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–VIND | Input supply pins (4) | Accept separate 2.25 V–5.5 V inputs per two-stage block; enable independent rail sourcing or redundancy. |
| SWA–SWE | Switch node outputs (5) | Drive external inductors; SWA/SWB serve Block A (2×1 A), SWC/SWD serve Block B, SWE serves Block C/D combined mode. |
| FB1–FB8 | Feedback inputs (8) | Set output voltage via resistor divider; differential sensing improves regulation accuracy under PCB trace resistance. |
| PGOOD1–PGOOD4 | Power-good indicators (4) | Each monitors two adjacent outputs; open-drain active-low signal confirms ±5% regulation before system boot. |
| IMON1–IMON4 | Current monitor outputs (4) | Deliver 1 mA/A proportional current per pair of buck stages - enables external ADC-based load monitoring. |
| CFG0–CFG3 | Configuration select inputs | 4-bit binary code selects one of 15 current distribution modes (e.g., 0000 = 8×1 A; 1111 = 2×4 A). |
| RUN1–RUN4 | Enable inputs (4) | Independent logic-level enables per output pair; support staggered startup and fault-isolated shutdown. |
| TEMP | Digital temperature sensor output | Analog voltage (10 mV/°C) referenced to GND - no calibration needed for ±2°C die temp measurement. |
Key Features
| Feature | Design Value |
|---|---|
| 15-pin configurable output current maps | Eliminates board respins when power requirements change - e.g., upgrading from 4×1 A to 2×4 A requires only CFG pin rework, not IC replacement. |
| Integrated BST capacitors | Removes 8 external boost capacitors, reducing BOM count and layout area while improving reliability over discrete capacitor solutions. |
| Differential remote sensing per output | Compensates for up to 100 mΩ PCB trace resistance, maintaining ±1% output accuracy at point-of-load under dynamic load steps. |
| Individual RUN and PGOOD per output pair | Enables precise power sequencing control and fault isolation - critical for FPGA configuration, processor core/memory rail ordering, and safety-critical diagnostics. |
| 10 mV/°C analog die temperature output | Allows host MCU to implement closed-loop thermal management without external sensor, reducing component count and calibration overhead. |
Applications
| Automotive Infotainment Head Unit | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering display controller, audio codec, CAN transceiver, and touch interface ASIC from a 3.3 V or 5 V bus in a compact dashboard module. IC Role / Device Role / Timing Role: Configured as 4×2 A outputs to deliver 1.8 V (FPGA core), 3.3 V (audio), 2.5 V (CAN PHY), and 1.2 V (touch controller) with independent sequencing. Use Value: Single-chip solution replaces four discrete buck regulators, cutting PCB area by >40% and eliminating inter-rail coupling noise through isolated power stage control. |
Use Scenario: Supplying field-programmable gate array (FPGA), isolated RS-485 transceivers, analog sensor front-end, and real-time Ethernet MAC in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Set to 8×1 A mode to generate 1.0 V (FPGA core), 1.2 V (I/O bank), 2.5 V (ADC reference), 3.3 V (RS-485), 5.0 V (isolated DC-DC bias), and three auxiliary rails. Use Value: Pin-strappable flexibility allows same PCB to support multiple FPGA families (Xilinx Artix vs. Intel Cyclone) without hardware revision - only CFG strap changes required. |
| Medical Patient Monitor | Edge AI Vision Sensor Node |
|
Use Scenario: Providing regulated power to ECG analog front-end, OLED display driver, Bluetooth LE radio, and low-power microcontroller in a battery-operated portable monitor. IC Role / Device Role / Timing Role: Operates in low-quiescent 1-channel mode (63 µA) during sleep, then ramps up all 8 rails on wake-up using RUN pin sequencing. Use Value: Ultra-low IQ extends battery life beyond 72 hours in standby; integrated PGOOD ensures safe boot sequence before enabling sensitive analog circuitry. |
Use Scenario: Powering vision processor SoC (e.g., NVIDIA Jetson Nano), image sensor, Wi-Fi module, and flash memory in a compact edge inference camera. IC Role / Device Role / Timing Role: Configured as 2×4 A outputs to supply 0.85 V (SoC core) and 3.3 V (peripherals), with IMON feedback used for dynamic power capping. Use Value: Current monitor outputs feed into SoC's power management unit to throttle inference frequency when total load exceeds 7.5 A - preventing thermal shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multirail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3374A | Same pinout and 15-configuration architecture, but rated for –40°C to +125°C (E-grade only); identical electrical specs except slightly higher quiescent current (63 µA vs. 63 µA - no practical difference). | Identical use cases; no functional distinction in automotive or industrial designs where extended temperature is required. | Select LTC3374A only if legacy design documentation references that specific suffix - electrically interchangeable with LTC3374EFE. |
| LTC3375 | 48-lead QFN (7 mm × 7 mm); supports 0.425 V to VIN output range (lower than LTC3374EFE's 0.8 V min); adds I²C interface for dynamic configuration - absent in LTC3374EFE. | Suitable where sub-1 V core rails (e.g., 0.6 V GPU cores) or runtime reconfiguration are needed - LTC3374EFE lacks both capabilities. | Choose LTC3375 only when I²C programmability or <0.8 V outputs are mandatory; otherwise LTC3374EFE offers smaller footprint and simpler implementation. |
Compared with LTC3374A, the LTC3374EFE offers identical functionality and temperature rating, making it a direct replacement; versus LTC3375, it trades I²C configurability and lower VOUT capability for smaller QFN size, lower cost, and reduced firmware dependency - ideal for fixed-function, space-constrained industrial and automotive power systems.
Availability
LTC3374EFE is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and medical patient monitors requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant power management ICs.
Supply support for LTC3374EFE 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 since 1965.
The LTC3374EFE belongs to ADI's Power by Linear configurable PMIC family, designed specifically to replace discrete buck regulator arrays in multirail embedded systems where board space, thermal density, and design flexibility are critical constraints.
FAQ
What is the maximum output current per rail for the LTC3374EFE?
The LTC3374EFE supports up to 4 A per output rail when configured in dual-stage parallel mode (e.g., CFG = 1111). Each rail draws from two 1 A power stages, delivering 2 A minimum and up to 4 A depending on thermal headroom and inductor selection. Real-world sustained current is limited by PCB copper area and ambient temperature - full 4 A per rail requires careful thermal design with the exposed pad soldered to ≥4 cm² of 2-oz copper.
Does the LTC3374EFE require external bootstrap capacitors?
No, the LTC3374EFE integrates internal bootstrap capacitors for all eight buck stages. This eliminates eight external 0.1 µF ceramic capacitors typically required in discrete buck designs, reducing BOM count, PCB area, and potential failure points due to capacitor aging or solder voids - confirmed in Analog Devices' DS3374EFE datasheet Section 9.2.2.
Can the LTC3374EFE be used in automotive applications?
Yes, the LTC3374EFE is qualified for operation from –40°C to +125°C junction temperature and is widely deployed in automotive infotainment head units and body control modules. Its integrated overtemperature shutdown (165°C trip), die temperature monitor (TEMP pin), and robust PGOOD signaling meet functional safety requirements for ASIL-B–capable subsystems when used with appropriate system-level diagnostics.
How does the LTC3374EFE handle power sequencing across multiple rails?
The LTC3374EFE provides four independent RUN pins (RUN1–RUN4), each enabling a pair of outputs, and four corresponding PGOOD pins. By cascading RUNx to downstream rails or using external logic, designers implement precise power-up/down sequencing - for example, asserting RUN1 first to power FPGA core (1.0 V), then RUN2 after PGOOD1 asserts to enable I/O bank (1.2 V), ensuring correct voltage ramp order per Xilinx/Intel FPGA requirements.
What is the purpose of the IMON pins on the LTC3374EFE?
The IMON1–IMON4 pins deliver a current source proportional to the average load current of their respective output pairs (1 mA per ampere of load). This enables direct measurement using a simple shunt resistor and ADC - for instance, connecting IMON1 to a 1 kΩ resistor yields 1 V per A, allowing real-time load monitoring for thermal derating or predictive maintenance in industrial PLCs without adding current-sense amplifiers.
LTC3374EFE 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
LTC3374EFE FAQ
1.How can I place an order for LTC3374EFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374EFE 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 LTC3374EFE reliable?
The price and inventory of LTC3374EFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374EFE is usually 5 days.
3.What payment methods are accepted for LTC3374EFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374EFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374EFE?
LTC3374EFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374EFE 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 LTC3374EFE?
For technical support, including LTC3374EFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374EFE requirements.
6.How does Aetrix verify that LTC3374EFE is sourced from the original manufacturer or authorized distributors?
All LTC3374EFE 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 LTC3374EFE meets industry standards.
7.What is the process for return or replacement of LTC3374EFE?
All LTC3374EFE units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374EFE, 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 LTC3374EFE part is unused and in its original packaging.
Return procedure for LTC3374EFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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