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Analog Devices Inc. LTC3375EUK
- Part No.:
- LTC3375EUK
- Manufacturer:
- Analog Devices Inc.
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC3375EUK.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,896
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Product details
Overview
LTC3375EUK from Analog Devices is an octal-channel, configurable power management IC with integrated 1.5 A power stages, supporting up to eight independent or paralleled buck outputs from a 2.25 V to 5.5 V input. It delivers total output current up to 8 A, features ±1% output voltage accuracy down to 0.425 V, and operates across –40°C to +125°C junction temperature. It is used in automotive infotainment and industrial control systems requiring flexible rail generation with minimal board area.
For engineers reviewing the LTC3375EUK datasheet, LTC3375EUK pinout, LTC3375EUK application, or LTC3375EUK equivalent, key selection considerations include its 48-lead QFN package, 15 configurable output current combinations, I²C interface for dynamic configuration, integrated thermal monitoring via TEMP pin, and support for external high-voltage controller integration.
Technical Context
The LTC3375EUK integrates eight 1.5 A synchronous buck power stages, configurable via CFG0–CFG3 pins into 15 distinct output topologies-ranging from single 8 A output to eight independent 1 A rails. Each channel supports output voltages from 0.425 V to VIN with internal compensation and differential remote sensing.
It includes I²C digital interface for real-time voltage/current adjustment and fault reporting, plus dedicated RUN, PGOOD, IMON, and TEMP pins for sequencing, load monitoring, and die temperature readout (10 mV/°C). Overtemperature shutdown activates at 165°C (typ), with recovery at 155°C (typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25 V to 5.5 V - supports Li-ion battery, USB PD, and low-voltage industrial rails without external LDO pre-regulation. |
| Total Output Current | Up to 8 A - achieved via eight 1.5 A stages; enables scalable multi-rail designs without discrete regulators. |
| Output Voltage Accuracy | ±1% - ensures stable core and I/O supply for FPGAs, microcontrollers, and ASICs under load and temperature variation. |
| Switching Frequency | 1 MHz to 3 MHz - allows compact external magnetics and reduces EMI sensitivity through programmable spread-spectrum sync. |
| Quiescent Current | 68 µA (1 channel enabled) - minimizes standby power loss in always-on automotive and IoT edge nodes. |
| Digital Interface | I²C-compatible - enables dynamic voltage scaling, fault logging, and system-level power coordination without additional MCU GPIOs. |
| Thermal Monitoring | 10 mV/°C analog TEMP output - provides direct die temperature feedback for closed-loop thermal management in sealed enclosures. |
Pinout & Package
The LTC3375EUK is housed in a 7 mm × 7 mm, 48-lead QFN package with exposed thermal pad (EP), optimized for high-power density and thermal dissipation in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–VING | Input power supply pins (7) | Accepts distributed 2.25 V–5.5 V inputs per channel group; enables localized decoupling and noise isolation. |
| SWA–SWH | Power switch node outputs (8) | Connects directly to external inductors; each corresponds to one 1.5 A buck stage for modular layout. |
| FB1–FB8 | Feedback inputs (8) | Supports resistor-divider programming of output voltage; differential sense capability improves regulation under PCB trace IR drop. |
| PGOOD1–PGOOD8 | Power-good status outputs (8) | Open-drain signals indicate ±7.5% output regulation window; enables sequenced enable/disable of downstream logic. |
| IMON1–IMON8 | Current monitor outputs (8) | Provides 1 µA/mA proportional current mirror output for real-time load telemetry and overcurrent detection. |
| CFG0–CFG3 | Configuration select inputs (4) | Hardwired logic inputs that define one of 15 output current configurations at power-up; no firmware required. |
| TEMP | Die temperature monitor | Analog voltage output (10 mV/°C); enables system-level thermal throttling without external sensor or ADC. |
| INTVCC | Internal LDO output | 3.3 V regulated supply for internal circuitry; can power external level-shifters or logic, reducing BOM count. |
Key Features
| Feature | Design Value |
|---|---|
| 15 Configurable Output Topologies | Enables single 8 A, dual 4 A, quad 2 A, or octal 1 A outputs - eliminates redesign when power requirements evolve during development. |
| Integrated High-Voltage Controller Support | Allows connection to external HV buck controllers (e.g., LTC389x) for mixed 5 V/12 V/24 V input systems - extends applicability beyond native 5.5 V input limit. |
| I²C Digital Interface | Permits runtime reconfiguration of output voltages, fault thresholds, and sequencing order - critical for adaptive test equipment and field-upgradable systems. |
| Thermal Shutdown & Monitoring | Shuts down all enabled channels at 165°C (typ) and reports die temperature continuously - prevents thermal runaway in sealed automotive ECUs. |
| Low-Noise Burst Mode® Operation | Maintains <20 mVPP output ripple at light loads while achieving 68 µA quiescent current - ideal for noise-sensitive analog and RF subsystems. |
Applications
| Automotive Infotainment Head Unit | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering display controller, audio codec, CAN transceiver, and touch processor within a compact dashboard module. IC Role / Device Role / Timing Role: Central PMIC generating eight independent rails (1.8 V, 2.5 V, 3.3 V, 5 V) with precise sequencing and thermal supervision. Use Value: Eliminates six discrete DC/DCs and associated passives; reduces solution size by >40% while enabling full-system thermal derating via TEMP pin feedback. |
Use Scenario: Supplying isolated sensor front-ends, FPGA configuration, Ethernet PHY, and RS-485 transceivers in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Configurable multi-rail source with I²C-based dynamic voltage scaling for FPGA core and I/O banks during partial reconfiguration. Use Value: Supports 15 distinct rail combinations without hardware change; enables firmware-driven power optimization for different I/O expansion modules. |
| Medical Point-of-Care Ultrasound | 5G Small Cell Baseband Unit |
Use Scenario: Delivering tightly regulated, low-noise supplies to ADCs, DACs, and beamforming ASICs in portable ultrasound handhelds. IC Role / Device Role / Timing Role: Low-quiescent, multi-output regulator with Burst Mode® operation to preserve battery life while maintaining signal integrity. Use Value: Achieves <20 mVPP ripple at 10 mA load and 68 µA IQ - meets clinical-grade analog performance requirements without added LDO post-regulation. |
Use Scenario: Powering baseband processors, memory interfaces, and RF front-end bias rails in thermally constrained outdoor small cell enclosures. IC Role / Device Role / Timing Role: Thermally aware PMIC with die temperature reporting and overtemperature shutdown to prevent performance throttling in ambient >85°C environments. Use Value: Enables predictive thermal management via TEMP pin voltage; avoids uncontrolled shutdown by triggering fan control or clock scaling before 165°C trip point. |
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 2.25 V–5.5 V input, no I²C interface, 38-lead QFN package | Lacks digital configurability; suited for fixed-function, cost-sensitive industrial controls where firmware control is unnecessary | Select LTC3374A when design requires identical analog flexibility but no runtime reprogramming or thermal telemetry. |
| LTC3376 | 4-channel, 20 V input, up to 12 A total, 7 mm × 7 mm BGA, no I²C, higher voltage capability | Targets 12 V/24 V automotive and industrial systems; trades channel count for input voltage range and thermal packaging | Select LTC3376 when input exceeds 5.5 V or when flip-chip BGA thermal performance outweighs need for eight independent rails. |
Compared with LTC3374A and LTC3376, the LTC3375EUK uniquely balances eight-channel granularity, I²C programmability, and 48-lead QFN manufacturability - making it optimal for mid-voltage, software-defined power systems where rail count, adaptability, and thermal reliability are jointly critical.
Availability
LTC3375EUK is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and medical imaging systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3375EUK 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 LTC3375EUK belongs to ADI's Power by Linear configurable buck regulator family, designed specifically for systems needing scalable, pin- and firmware-configurable multi-rail power with minimal footprint and robust thermal management.
FAQ
What is the maximum total output current supported by the LTC3375EUK?
The LTC3375EUK supports a maximum total output current of 8 A, achieved by configuring its eight internal 1.5 A synchronous buck power stages in parallel or independent topologies. This 8 A capacity is distributed across up to eight output rails depending on the selected CFG0–CFG3 pin configuration, with verified operation across the full –40°C to +125°C junction temperature range.
Does the LTC3375EUK support I²C communication, and what functions does it enable?
Yes, the LTC3375EUK includes a fully functional I²C interface that enables real-time readback of output voltages, load currents (via IMON pins), die temperature (via TEMP pin), and fault status. It also supports dynamic adjustment of output voltages, PGOOD thresholds, and sequencing delays - allowing the LTC3375EUK to adapt to changing system power needs without hardware modification.
How does the thermal protection mechanism work in the LTC3375EUK?
The LTC3375EUK incorporates dual thermal protection: an overtemperature shutdown function disables all enabled buck regulators when die temperature reaches 165°C (typical), and a linear analog TEMP pin outputs 10 mV per °C for continuous external monitoring. Recovery occurs automatically when die temperature falls to 155°C (typical), and the TEMP pin voltage can be used to implement predictive thermal throttling before shutdown occurs.
Can the LTC3375EUK be used with input voltages above 5.5 V?
No - the LTC3375EUK has a strict 2.25 V to 5.5 V input voltage rating for its internal buck regulators. However, it supports integration with external high-voltage controllers (e.g., LTC3891) via its dedicated HV controller interface pins, enabling hybrid power systems where the LTC3375EUK manages low-voltage rails while an external controller handles 12 V or 24 V inputs.
What package type and thermal characteristics does the LTC3375EUK use?
The LTC3375EUK uses a 7 mm × 7 mm, 48-lead QFN package with exposed thermal pad (EP), rated for operation from –40°C to +125°C junction temperature. Its thermal resistance θJA is 30°C/W on a 2-layer PCB with 2 in² copper pour, and θJC is 4.5°C/W, enabling reliable 8 A operation in compact industrial and automotive enclosures without forced airflow.
LTC3375EUK 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)
LTC3375EUK FAQ
1.How can I place an order for LTC3375EUK through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3375EUK 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 LTC3375EUK reliable?
The price and inventory of LTC3375EUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3375EUK is usually 5 days.
3.What payment methods are accepted for LTC3375EUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3375EUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3375EUK?
LTC3375EUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3375EUK 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 LTC3375EUK?
For technical support, including LTC3375EUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3375EUK requirements.
6.How does Aetrix verify that LTC3375EUK is sourced from the original manufacturer or authorized distributors?
All LTC3375EUK 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 LTC3375EUK meets industry standards.
7.What is the process for return or replacement of LTC3375EUK?
All LTC3375EUK units undergo pre-shipment inspection (PSI). If there is an issue with LTC3375EUK, 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 LTC3375EUK part is unused and in its original packaging.
Return procedure for LTC3375EUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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