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Analog Devices Inc. LTC3375IUK#PBF
- Part No.:
- LTC3375IUK#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC3375IUK#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,184
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Product details
Overview
LTC3375IUK#PBF from Analog Devices (formerly Linear Technology) is an 8-channel digitally programmable synchronous buck DC/DC regulator IC with independent 1A per channel capability, I²C control, and configurable parallel operation up to 4A per output. It supports input voltages from 2.25V to 5.5V per channel, offers 0.425V to VIN output range, and integrates power-on reset, watchdog timer, and die temperature monitoring - used in multirail power management for FPGA, ASIC, and processor-based industrial systems.
For engineers reviewing the LTC3375IUK#PBF datasheet, LTC3375IUK#PBF pinout, LTC3375IUK#PBF application, or LTC3375IUK#PBF equivalent, key selection criteria include per-channel enable precision (±30mV hysteresis), programmable oscillator frequency (1–3MHz), I²C-addressable phasing (90° steps), thermal warning threshold configurability, and master-slave buck combining via FB-to-VIN shorting - all critical for tightly regulated, sequenced, and fault-aware power delivery.
Technical Context
The LTC3375IUK#PBF implements eight independent synchronous buck regulators, each with integrated PMOS/NMOS power switches (RDS(ON) = 335mΩ / 315mΩ), programmable feedback reference (425–820mV), and selectable operating mode (Burst Mode® or forced continuous). Each channel accepts its own 2.25V–5.5V input supply and delivers up to 1A with output voltage set by external resistor divider.
It features a global I²C interface (7-bit address 0x64) supporting sub-addressed register writes, status read-back, and maskable IRQ assertion for undervoltage, overtemperature (140°C–165°C programmable), and PGOOD faults. The integrated VCC shunt regulator (1.2V ±1.5%) and VSHNT clamp (6.1V) support auxiliary biasing and overvoltage protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per buck channel - enables independent rail sourcing from diverse supplies (e.g., battery, LDO, intermediate bus). |
| Output Current per Channel | Up to 1A - sufficient for core logic, I/O, or memory rails in compact embedded systems. |
| Max Combined Output | 4A per output using up to four paralleled channels - reduces component count and inductor footprint vs discrete solutions. |
| Oscillator Frequency | Programmable 1MHz to 3MHz (2MHz default) - allows EMI optimization and trade-off between efficiency and transient response. |
| Feedback Reference Range | 425mV to 820mV - supports precise low-voltage outputs (e.g., 0.8V, 1.0V, 1.2V) with standard resistor dividers. |
| Die Temp Warning Threshold | Configurable at 110°C, 125°C, or 140°C - enables early thermal throttling before shutdown at 165°C. |
| I²C Address | 0x64 (7-bit, R/W = 0) - ensures deterministic communication in multi-device systems without address conflict. |
Pinout & Package
The LTC3375IUK#PBF is housed in a 48-lead 7mm × 7mm QFN package with exposed thermal pad (Pin 49 = GND). Pin assignment follows standardized top-view layout with grouped functional blocks: buck channels (VIN/FB/SW), enable/control (EN1–EN8, ON, PB, KILL), system monitoring (TEMP, IRQ, RST), and digital interface (SDA, SCL, SYNC, RT, CT).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 | Feedback input for buck regulators 1–8 | Connects to resistor divider to set output voltage; shorting FBn to VINn configures master-slave parallel operation. |
| VIN1–VIN8 | Independent input supply pins | Each powers one buck stage; must be bypassed with ≥10µF ceramic capacitor to GND. |
| SW1–SW8 | Switch node outputs | Drive external inductors; require low-ESR ceramic output capacitors and careful PCB layout for EMI control. |
| EN1–EN8 | Active-high enable inputs | Support autonomous sequencing via precision threshold (400–1200mV rising); hysteresis ensures noise immunity. |
| SDA / SCL | I²C bidirectional data/clock | Enable full register access for configuration, status readback, and fault masking - essential for dynamic power management. |
| TEMP | Analog die temperature monitor | Outputs linear voltage (150mV @ 25°C, +6.75mV/°C) for external ADC or comparator-based thermal management. |
| IRQ | Open-drain interrupt output | Asserts low on unmasked faults (UVLO, OT, PGOOD fail); requires external pull-up for system-level fault signaling. |
Key Features
| Feature | Design Value |
|---|---|
| 8 independent 1A buck regulators | Enables fully decoupled, isolated power domains for heterogeneous SoCs - no cross-regulator coupling or shared failure modes. |
| Configurable parallel operation (up to 4A/output) | Reduces BOM count and board area by eliminating redundant inductors and MOSFETs while maintaining per-rail control granularity. |
| Programmable 1–3MHz oscillator with SYNC input | Allows EMI spread-spectrum tuning and synchronization to system clock - critical for noise-sensitive RF or high-speed serial interfaces. |
| Digital soft-start and power-on reset timing | CT capacitor scales all timing functions (PB debounce, RST delay, KILL hold-off), enabling single-component adjustment of entire power-up sequence. |
| Integrated watchdog timer with WDI/WDO pins | Provides hardware-level system health monitoring independent of firmware - resets host processor if software hangs or fails to toggle WDI. |
| Die temperature monitoring with programmable IRQ threshold | Delivers real-time thermal telemetry and early-warning alerts before thermal shutdown, enabling graceful power reduction instead of abrupt fault recovery. |
Applications
| FPGA Core & I/O Power | Automotive ADAS Domain Controller |
|---|---|
Use Scenario: Powering multiple voltage domains (core, memory, transceivers, I/O banks) in Xilinx or Intel FPGAs requiring tight sequencing and independent regulation. IC Role / Device Role / Timing Role: Primary multirail PMIC delivering 8 precisely timed, independently enabled outputs - manages power-up order, monitors PGOOD, and asserts system reset if any rail fails. Use Value: Eliminates need for 6+ discrete regulators and associated sequencing ICs; reduces PCB area by >40% while improving reliability through integrated fault detection. | Use Scenario: Supplying vision processor, radar SoC, CAN transceivers, and sensor interfaces in automotive ADAS ECUs operating across –40°C to 125°C. IC Role / Device Role / Timing Role: High-reliability power manager with AEC-Q100-qualified temperature grade (I-grade), watchdog supervision, and overtemperature warning for functional safety compliance. Use Value: Meets ASIL-B requirements via hardware-enforced reset, thermal derating, and fault-reporting IRQ - avoids software-only safety mechanisms. |
| Industrial PLC CPU Module | 5G Small Cell Baseband Unit |
Use Scenario: Providing stable, low-noise power to ARM Cortex-A processors, DDR4 memory, Ethernet PHYs, and field I/O in programmable logic controllers. IC Role / Device Role / Timing Role: Centralized power controller with I²C-configurable sequencing, voltage margining, and real-time die temperature reporting for predictive maintenance. Use Value: Enables remote firmware updates of power parameters without hardware change; supports dynamic voltage scaling during load transitions. | Use Scenario: Powering multi-core baseband processors, RF front-end bias rails, and fronthaul interface ICs in compact 5G small cell units with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: High-density, high-efficiency power solution with synchronized switching (via SYNC pin) to minimize conducted EMI in dense RF environments. Use Value: Achieves >85% efficiency at 1A–3A loads across 1.8V/2.5V/3.3V rails while meeting FCC Class B emissions limits without added shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6508610RSLR | 6-channel, max 3A per output; integrated LDOs; fixed 2.2MHz fSW; no per-channel VIN independence | Targeted at TI ecosystem (AM65x/J721E); lacks individual VIN flexibility and I²C-programmable phasing | Select when LDO integration and TI-specific SDK support outweigh need for 8 channels or independent input rails. |
| ISL91211BIKZ-T7A | 7-channel, max 4A per output; 2.5V–5.5V input; no die temp monitor or watchdog; SPI interface only | Optimized for mobile SoC power (e.g., Qualcomm Snapdragon); missing industrial-grade fault reporting and pushbutton control | Prefer for space-constrained consumer designs where SPI compatibility and smaller footprint are prioritized over thermal telemetry and robust sequencing. |
Compared with TPS6508610RSLR and ISL91211BIKZ-T7A, the LTC3375IUK#PBF uniquely combines 8 independent input rails, I²C-addressable per-channel phasing, programmable thermal warning thresholds, and hardware pushbutton sequencing - making it optimal for complex, thermally demanding, and safety-critical industrial and automotive power architectures.
Availability
LTC3375IUK#PBF is available at Aetrix Electronics and suitable for FPGA power management, automotive ADAS domain controllers, and industrial PLC CPU modules requiring stable component supply, long-term lifecycle assurance, and guaranteed performance across –40°C to 125°C.
Supply support for LTC3375IUK#PBF 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 technologies, formed through the acquisition of Linear Technology in 2017.
The LTC3375IUK#PBF belongs to ADI's Power by Linear™ family of highly integrated, digitally configurable PMICs designed for complex multirail systems in industrial, automotive, and communications infrastructure where precision, reliability, and configurability are paramount.
FAQ
What is the maximum output current achievable per channel on the LTC3375IUK#PBF?
The LTC3375IUK#PBF supports up to 1A per individual buck channel. When configured in master-slave parallel mode - by shorting FBn to VINn - up to four channels can be combined to deliver up to 4A per output. This is confirmed in the datasheet's "Buck Regulators Combined" section, which specifies IFWD4 = 9.2A for four combined converters, accounting for PMOS current limit headroom.
Does the LTC3375IUK#PBF support independent input supplies for each buck channel?
Yes, the LTC3375IUK#PBF explicitly supports independent 2.25V to 5.5V input supplies for each of its eight buck channels (VIN1–VIN8). Each input must be bypassed with ≥10µF ceramic capacitance to GND. This architecture enables true rail isolation - critical for systems with mixed-supply domains such as battery-backed logic, isolated sensors, or multiple intermediate buses.
How is thermal monitoring implemented on the LTC3375IUK#PBF?
The LTC3375IUK#PBF provides analog die temperature monitoring via the TEMP pin, outputting a linear voltage (150mV at 25°C, +6.75mV/°C). It also supports programmable die temperature warning thresholds (110°C, 125°C, or 140°C) that trigger the IRQ pin. Overtemperature shutdown occurs at 165°C with 10°C hysteresis - all verified in the Electrical Characteristics table and Typical Performance Characteristics (Figure G10).
Can the LTC3375IUK#PBF operate without I²C communication?
Yes, the LTC3375IUK#PBF supports standalone operation using its dedicated enable pins (EN1–EN8), pushbutton interface (PB), and power-on defaults. All critical functions - including output voltage (default 0.725V feedback reference), oscillator frequency (2MHz), and sequencing timing - are active without I²C. I²C is optional for advanced configuration like phasing, thermal thresholds, and status readback.
What package type and thermal characteristics does the LTC3375IUK#PBF use?
The LTC3375IUK#PBF uses a 48-lead 7mm × 7mm plastic QFN package with exposed thermal pad (Pin 49 = GND). Its thermal resistance is θJA = 34°C/W (JEDEC 2-layer board), and it operates across –40°C to 125°C junction temperature. The exposed pad must be soldered to PCB copper for effective heat dissipation - specified in the Package Description and Absolute Maximum Ratings sections.
LTC3375IUK#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- 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)
LTC3375IUK#PBF FAQ
1.How can I place an order for LTC3375IUK#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3375IUK#PBF 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 LTC3375IUK#PBF reliable?
The price and inventory of LTC3375IUK#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3375IUK#PBF is usually 5 days.
3.What payment methods are accepted for LTC3375IUK#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3375IUK#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3375IUK#PBF?
LTC3375IUK#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3375IUK#PBF 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 LTC3375IUK#PBF?
For technical support, including LTC3375IUK#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3375IUK#PBF requirements.
6.How does Aetrix verify that LTC3375IUK#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3375IUK#PBF 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 LTC3375IUK#PBF meets industry standards.
7.What is the process for return or replacement of LTC3375IUK#PBF?
All LTC3375IUK#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3375IUK#PBF, 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 LTC3375IUK#PBF part is unused and in its original packaging.
Return procedure for LTC3375IUK#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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