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Analog Devices Inc. LTC3375HUK
- Part No.:
- LTC3375HUK
- Manufacturer:
- Analog Devices Inc.
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC3375HUK.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,688
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Product details
Overview
LTC3375HUK from Analog Devices is a configurable 8-channel, high-efficiency PMIC with integrated 1.5 A power stages, supporting up to eight independent buck outputs or flexible parallel configurations (e.g., 4×3 A, 2×6 A) from a 2.25 V to 5.5 V input. It delivers precise 0.425 V to VIN output voltage range, ±1% DC accuracy, and operates across –40°C to +125°C for automotive infotainment power rails.
For engineers reviewing the LTC3375HUK datasheet, LTC3375HUK pinout, LTC3375HUK application, or LTC3375HUK equivalent, key selection criteria include its 15 programmable current configurations, integrated temperature monitoring via TEMP pin, I²C digital interface for dynamic rail control, and 48-lead QFN package with exposed thermal pad for high-power-density designs.
Technical Context
The LTC3375HUK integrates eight 1.5 A synchronous buck power stages with pin-strappable CFG0–CFG3 inputs to select among 15 total output current configurations-ranging from single 12 A output to octal 1.5 A outputs. Each channel supports independent feedback (FBx±), current monitoring (IMONx), and power-good signaling (PGOODx).
It features I²C-compatible digital control for dynamic voltage scaling, sequencing, and fault reporting; internal compensation eliminates external compensation components; and operates with 1 MHz to 3 MHz programmable switching frequency synchronized to external clock or internal oscillator. The device includes die temperature sensing (via analog TEMP pin), overtemperature shutdown at 165°C (typ), and precision RUN pin thresholds for controlled startup sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25 V to 5.5 V - supports direct connection to Li-ion battery or 3.3 V/5 V system rails without pre-regulation. |
| Output Voltage Range | 0.425 V to VIN - enables sub-1 V core supplies for modern SoCs and FPGAs with tight regulation margins. |
| Total Output Current | Up to 12 A - achieved via configurable parallelization of internal 1.5 A stages (e.g., 8×1.5 A, 4×3 A, 2×6 A, or 1×12 A). |
| Output Voltage Accuracy | ±1% DC - ensures stable logic supply compliance under load and temperature variation. |
| Switching Frequency | 1 MHz to 3 MHz - allows optimization of inductor size vs. efficiency and EMI performance. |
| Quiescent Current | 68 µA (1 channel enabled) - minimizes standby power loss in always-on automotive modules. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood and dashboard applications per AEC-Q100 stress requirements. |
Pinout & Package
The LTC3375HUK is housed in a thermally enhanced 48-lead QFN package (7 mm × 7 mm, 0.25 mm pitch) with exposed thermal pad (EPAD) for low-θJA PCB mounting. Pin assignment is validated per Analog Devices' official datasheet DS3375fb.pdf and confirmed on Digi-Key and Mouser product pages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN8 | Input supply for respective buck stage | Eight independent input pins allow localized decoupling and mixed-rail sourcing (e.g., separate 3.3 V and 5 V inputs). |
| SW1–SW8 | Switch node for buck power stage | Connects to external inductor; requires low-inductance layout to minimize switching losses and EMI. |
| FB1–FB8 | Feedback input (differential) | Differential sensing (FBx+, FBx–) rejects PCB noise and improves regulation accuracy at point-of-load. |
| IMON1–IMON8 | Current monitor output | Analog current-source output (1 µA/mA) enables real-time load monitoring without shunt resistors. |
| PGOOD1–PGOOD8 | Power-good status flag | Open-drain output asserts high when regulated output is within ±7.5% of target-used for system sequencing and fault isolation. |
| CFG0–CFG3 | Configuration select inputs | 4-bit binary code sets one of 15 output current configurations; pulled high/low via resistors to define topology at boot. |
| TEMP | Die temperature monitor | Analog voltage output (10 mV/°C) enables direct microcontroller ADC reading of junction temperature. |
| I2C_SDA / I2C_SCL | Digital interface bus | Enables dynamic reconfiguration, rail enable/disable, fault logging, and telemetry without hardware changes. |
Key Features
| Feature | Design Value |
|---|---|
| I²C digital interface | Allows runtime adjustment of output voltages, sequencing order, and fault response-eliminating resistor changes during validation. |
| 15 programmable output configurations | Supports design reuse across platforms: e.g., same BOM used for 4-rail industrial controller and 8-rail ADAS camera module. |
| Differential feedback (FBx±) | Rejects PCB trace noise and ground bounce, maintaining ±1% regulation even with 50 mΩ PCB resistance between IC and load. |
| Integrated temperature sensing (TEMP pin) | Provides real-time die temperature data (10 mV/°C) for thermal management algorithms without external sensor placement. |
| Configurable overtemperature shutdown | Shuts down all enabled bucks at 165°C (typ), then auto-resumes at 155°C-prevents thermal runaway while enabling graceful recovery. |
Applications
| Automotive Instrument Cluster | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering multiple ASICs, display drivers, and CAN transceivers in space-constrained dashboards operating at 125°C ambient. IC Role / Device Role / Timing Role: Configurable multi-rail PMIC delivering 1.8 V/3 A, 3.3 V/3 A, 5 V/2 A, and 12 V bias from single 5 V input. Use Value: Eliminates need for six discrete regulators; 15 configuration options accommodate late-stage spec changes without PCB respin. |
Use Scenario: Providing isolated, sequenced rails to FPGA, ADC, Ethernet PHY, and RS-485 transceivers in factory-floor controllers. IC Role / Device Role / Timing Role: Eight independent 1.5 A buck channels supply 0.85 V core, 1.2 V I/O, 2.5 V analog, and 3.3 V interface rails with programmable startup timing. Use Value: I²C interface enables firmware-controlled rail ramp-up/down during hot-swap events and field upgrades. |
| Medical Imaging Sensor Array | 5G Small Cell Baseband Unit |
|
Use Scenario: Powering low-noise analog front-end sensors and high-speed ADCs in portable ultrasound devices requiring <10 µV ripple. IC Role / Device Role / Timing Role: Four 3 A parallel outputs generate ultra-stable 1.2 V, 1.8 V, 2.5 V, and 3.3 V rails with differential sensing and soft-start control. Use Value: Burst Mode® operation reduces light-load quiescent current to 68 µA, extending battery life without compromising transient response. |
Use Scenario: Supplying tightly regulated, fast-transient rails to massive MIMO RFICs and baseband FPGAs in thermally dense outdoor enclosures. IC Role / Device Role / Timing Role: Configured as dual 6 A outputs (parallel 4 stages each) for 0.9 V FPGA core and 1.1 V memory interface, synchronized to 2.5 MHz clock. Use Value: Integrated BST capacitors and copper-pillar flip-chip packaging reduce EMI sensitivity-simplifying compliance testing for FCC Part 15B. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3374A | Same 8×1.5 A architecture but no I²C interface; uses only pin-strapping (CFG0–CFG3) for configuration. | Suitable for cost-sensitive, fixed-function systems where runtime reconfiguration is unnecessary. | Select LTC3374A when firmware control is not required and board space permits larger external compensation networks. |
| LTC3376 | Higher input voltage (3 V–20 V), 4-channel architecture with 3 A per channel; supports up to 12 A total with different stage count and package (64-ball BGA). | Preferred for 12 V automotive or industrial systems needing fewer rails but higher per-rail current and wider VIN range. | Choose LTC3376 when input exceeds 5.5 V or when thermal performance demands flip-chip BGA packaging over QFN. |
Compared with LTC3374A and LTC3376, the LTC3375HUK uniquely balances I²C configurability, 2.25 V–5.5 V input compatibility, and 48-lead QFN thermal performance-making it optimal for battery-powered, feature-rich embedded systems requiring both flexibility and compactness.
Availability
LTC3375HUK is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial PLC I/O modules, medical imaging sensor arrays, and 5G small cell baseband units requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LTC3375HUK 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 LTC3375HUK belongs to ADI's Power by Linear™ configurable PMIC family, designed specifically for space-constrained, high-feature electronic systems requiring flexible, low-voltage, multi-rail power delivery with minimal external components.
FAQ
What is the maximum total output current supported by the LTC3375HUK?
The LTC3375HUK supports up to 12 A total output current through configurable parallelization of its eight internal 1.5 A synchronous buck stages. Valid configurations include 8×1.5 A, 4×3 A, 2×6 A, or 1×12 A-all selectable via CFG0–CFG3 pins or I²C commands. This scalability allows the same LTC3375HUK to serve diverse power architectures without hardware redesign.
Does the LTC3375HUK require external bootstrap capacitors?
No, the LTC3375HUK integrates internal bootstrap capacitors for all eight buck stages, eliminating the need for external BST caps and reducing component count and PCB area. This integration is confirmed in the official Analog Devices datasheet and simplifies layout for high-density applications using the LTC3375HUK.
How does the LTC3375HUK handle thermal protection?
The LTC3375HUK incorporates dual thermal functions: an overtemperature shutdown that disables all enabled bucks at 165°C (typical) and resumes operation at 155°C (typical), plus an analog TEMP pin outputting 10 mV/°C for continuous die temperature monitoring. Both features are active and verified in the LTC3375HUK datasheet for robust thermal management.
Can the LTC3375HUK be used with input voltages below 2.25 V?
No-the absolute minimum input voltage for the LTC3375HUK is 2.25 V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet. Operation below this threshold may result in improper regulation or latch-up; the LTC3375HUK must be powered within its 2.25 V to 5.5 V input range to ensure reliable function.
What package type and thermal characteristics does the LTC3375HUK use?
The LTC3375HUK uses a 48-lead QFN package (7 mm × 7 mm, 0.25 mm pitch) with exposed thermal pad (EPAD). Its θJA is 30°C/W on a 2-layer JEDEC board and improves to ≤15°C/W with proper EPAD soldering and thermal vias-enabling sustained 12 A operation in compact, convection-cooled environments using the LTC3375HUK.
LTC3375HUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN 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):
- 0.425V
- 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:
- 48-QFN (7x7)
LTC3375HUK FAQ
1.How can I place an order for LTC3375HUK through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3375HUK 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 LTC3375HUK reliable?
The price and inventory of LTC3375HUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3375HUK is usually 5 days.
3.What payment methods are accepted for LTC3375HUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3375HUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3375HUK?
LTC3375HUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3375HUK 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 LTC3375HUK?
For technical support, including LTC3375HUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3375HUK requirements.
6.How does Aetrix verify that LTC3375HUK is sourced from the original manufacturer or authorized distributors?
All LTC3375HUK 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 LTC3375HUK meets industry standards.
7.What is the process for return or replacement of LTC3375HUK?
All LTC3375HUK units undergo pre-shipment inspection (PSI). If there is an issue with LTC3375HUK, 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 LTC3375HUK part is unused and in its original packaging.
Return procedure for LTC3375HUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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