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Analog Devices Inc. LTC3375EUK#TRPBF
- Part No.:
- LTC3375EUK#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC3375EUK#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,598
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Product details
Overview
LTC3375EUK#TRPBF from Analog Devices (formerly Linear Technology) is an 8-channel digitally programmable synchronous buck DC/DC regulator IC with independent 2.25V–5.5V input supplies per channel, 1A per channel output capability, I²C and standalone control, and configurable parallel operation up to 4A per output. It serves as a multichannel power management solution for FPGA, SoC, and ASIC core/logic rail sequencing in industrial and automotive systems.
For engineers reviewing the LTC3375EUK#TRPBF datasheet, LTC3375EUK#TRPBF pinout, LTC3375EUK#TRPBF application, or LTC3375EUK#TRPBF equivalent, key selection considerations include per-channel enable precision (±30mV hysteresis), programmable 1–3MHz oscillator frequency, die temperature monitoring with maskable IRQ, pushbutton-controlled power-up/reset sequencing, and master-slave configuration support for combined outputs using shared inductors.
Technical Context
The LTC3375EUK#TRPBF integrates eight independent synchronous buck regulators, each with PMOS/NMOS power stages (RDS(ON) = 335mΩ/315mΩ), programmable feedback reference (425mV–820mV), and selectable operating modes (Burst Mode® or forced continuous). All channels share a common VCC shunt regulator (2.7–5.5V) and temperature-sensing circuitry with 6.75mV/°C slope and 165°C overtemperature shutdown.
Its I²C interface supports sub-addressed writes, status byte readback, and global register programming for oscillator frequency, phasing (90° steps), die temperature warning thresholds (110°C–140°C), and watchdog timing. The device implements autonomous sequencing via precision enable pins (400–1200mV rising threshold) and hardware controls including ON, KILL, PB, RST, and IRQ with CT-scaled timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per buck channel; enables mixed-rail system integration with separate supply domains. |
| Output Current | Up to 1A per channel; up to 4A per output when combining 2–4 channels with shared inductor and synchronized phasing. |
| Feedback Voltage Range | 0.425V to VIN; supports low-voltage core rails (e.g., 0.8V, 1.0V, 1.2V) with external resistor divider scaling. |
| Oscillator Frequency | Programmable 1MHz to 3MHz via RT resistor or external SYNC signal; default 2MHz for optimal efficiency–size trade-off. |
| Die Temperature Monitoring | Linear 6.75mV/°C TEMP output with programmable IRQ warning thresholds (110°C–140°C); enables real-time thermal margining. |
| Enable Threshold Accuracy | 400mV to 1200mV rising threshold with 60mV hysteresis; ensures reliable autonomous power-up sequencing without microcontroller intervention. |
| Package | 48-lead 7mm × 7mm QFN with exposed thermal pad; supports high-power density PCB layouts and efficient heat dissipation. |
Pinout & Package
Package: 48-lead (7mm × 7mm) plastic QFN with exposed GND pad (Pin 49), rated for –40°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 (Pins 1,6,7,12,25,30,31,36) | Buck feedback inputs | Connect to resistor dividers for output voltage regulation; shorting FBx to VINx combines channels for higher current. |
| VIN1–VIN8 (Pins 2,5,8,11,26,29,32,35) | Independent input supplies | Each accepts 2.25V–5.5V; must be bypassed with ≥10µF ceramic capacitor; enables multi-supply domain flexibility. |
| SW1–SW8 (Pins 3,4,9,10,27,28,33,34) | Switch node outputs | Drive external inductors; require low-ESR ceramic output capacitors and careful layout for EMI control. |
| EN1–EN8 (Pins 48,47,14,13,24,23,38,37) | Channel enable inputs | Active-high digital enables with precision voltage thresholds (400–1200mV); support autonomous or I²C-controlled sequencing. |
| IRQ, RST, ON, PB, KILL (Pins 15,16,20,21,22) | System control & fault signaling | Open-drain logic signals with CT-scaled timing; enable pushbutton power-on, watchdog reset, kill override, and interrupt-driven fault handling. |
| SDA, SCL, TEMP, VSHNT, VCC, FBVCC (Pins 46,45,44,43,41,42) | I²C interface & auxiliary regulation | Support full I²C communication (400kHz), die temperature readout, VCC shunt regulation (1.2V ref), and clamp protection (6.1V max). |
Key Features
| Feature | Design Value |
|---|---|
| 8 independent 1A buck regulators | Enables discrete power rail generation for heterogeneous SoCs/FPGAs without external controllers or complex PMICs. |
| Configurable channel paralleling | Up to four channels per output with shared inductor reduces component count and improves current sharing accuracy vs discrete solutions. |
| Programmable 1–3MHz switching frequency | Allows optimization of inductor size, efficiency, and EMI profile across varying load and thermal conditions. |
| Digital temperature monitoring with IRQ | Provides real-time die temperature data (150mV at 25°C, +6.75mV/°C) and programmable fault interrupts for predictive thermal management. |
| Hardware-based power sequencing | Pushbutton (PB), kill (KILL), reset (RST), and ON signals with CT-scaled timing eliminate firmware dependency for robust system startup/shutdown. |
| I²C-configurable phasing (90° steps) | Reduces input ripple current by interleaving switch-node transitions-critical for minimizing bulk capacitance in space-constrained designs. |
Applications
| Industrial PLC Power Management | Automotive ADAS Domain Controller |
|---|---|
Use Scenario: Powering multiple isolated I/O modules, analog front-ends, and microcontrollers within a programmable logic controller cabinet under wide ambient temperature swings. IC Role / Device Role / Timing Role: LTC3375EUK#TRPBF acts as the primary multirail power source, delivering 1.2V, 1.8V, 2.5V, and 3.3V rails with autonomous enable sequencing and thermal derating based on enclosure temperature. Use Value: Eliminates need for discrete buck controllers and sequencers; reduces BOM count by 60% while enabling real-time die temperature monitoring for predictive maintenance alerts. | Use Scenario: Supplying core voltage (0.85V), memory (1.2V), interface (1.8V), and auxiliary (3.3V) rails for radar and camera processing SoCs in autonomous driving ECUs. IC Role / Device Role / Timing Role: LTC3375EUK#TRPBF provides tightly regulated, phase-synchronized outputs with programmable power-on reset delay and watchdog timer to meet ISO 26262 ASIL-B functional safety requirements. Use Value: Achieves <1% output voltage deviation across –40°C to 125°C and supports fail-safe shutdown via IRQ/RST assertion during thermal overload or undervoltage events. |
| FPGA-Based Test Equipment | 5G Small Cell Baseband Unit |
Use Scenario: Powering Xilinx Artix-7 FPGA banks (VCCINT, VCCAUX, VCCO), ADC/DAC signal chains, and Ethernet PHYs in portable RF test instrumentation. IC Role / Device Role / Timing Role: LTC3375EUK#TRPBF delivers eight precisely tracked rails with independent enable control and I²C-adjustable output voltages to match FPGA configuration states. Use Value: Enables dynamic voltage scaling during different test modes; reduces power supply noise coupling through interleaved switching and dedicated VIN supplies per channel. | Use Scenario: Generating bias voltages for massive MIMO RF transceivers, baseband processors, and fronthaul interfaces in compact outdoor small cell enclosures. IC Role / Device Role / Timing Role: LTC3375EUK#TRPBF serves as the central power manager, combining channels for 3A RF bias rails while maintaining independent control of digital logic supplies. Use Value: Supports high-current RF loads with minimal board area (shared inductors) and maintains thermal stability via die temperature feedback to adjust output current limits dynamically. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS650860ARSLR | 6-channel buck (up to 6A total), integrated LDOs, fixed 1.8V/3.3V outputs; no per-channel VIN independence or programmable phasing. | Targeted at Intel Atom/Celeron platforms; lacks die temperature monitoring and pushbutton sequencing logic. | Select when platform-specific reference design compatibility is required and thermal monitoring is handled externally. |
| ISL91211BIWFZ-T7A | 4-channel buck (up to 4A/channel), integrated PMIC with I²C, but only two independent VIN domains; no hardware PB/KILL controls. | Optimized for mobile AP SoCs; missing autonomous sequencing, CT-scaled timing, and 8-channel granularity. | Choose for space-constrained portable designs where fewer rails and lower quiescent current (<10µA) outweigh channel count and sequencing flexibility. |
Compared with TPS650860ARSLR and ISL91211BIWFZ-T7A, the LTC3375EUK#TRPBF offers superior channel count (8 vs 4–6), true per-channel input supply independence, hardware-based pushbutton sequencing, and direct die temperature sensing-making it uniquely suited for ruggedized industrial and automotive systems requiring field-serviceable, firmware-agnostic power control.
Availability
LTC3375EUK#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS controllers, FPGA-based test equipment, and 5G small cell baseband units requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3375EUK#TRPBF 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 acquired Linear Technology in 2017 and continues its legacy of high-performance analog, mixed-signal, and power management ICs for demanding applications.
The LTC3375EUK#TRPBF belongs to Linear's multichannel power management product line, designed specifically for complex embedded systems requiring fine-grained, software-configurable, and hardware-robust power delivery with minimal external components.
FAQ
What is the maximum output current achievable per channel using the LTC3375EUK#TRPBF?
The LTC3375EUK#TRPBF supports up to 1A per individual buck channel. When configured in master-slave mode, up to four channels can be paralleled to deliver up to 4A per output using a single shared inductor. This is enabled by connecting the FB pin of a slave channel to the VIN pin of its master, and synchronizing switching phases in 90° increments via I²C register settings. The LTC3375EUK#TRPBF datasheet specifies PMOS current limits of 2.3A (1-channel), 4.6A (2-channel), 6.9A (3-channel), and 9.2A (4-channel) under typical conditions.
How does the LTC3375EUK#TRPBF handle thermal protection and monitoring?
The LTC3375EUK#TRPBF integrates a precision die temperature sensor with a linear 6.75mV/°C output (150mV at 25°C) routed to the TEMP pin. It features programmable die temperature warning thresholds (110°C, 125°C, 140°C) that trigger a low-active IRQ signal when exceeded. Overtemperature shutdown activates at 165°C with 10°C hysteresis. These functions are fully accessible and configurable via I²C, allowing real-time thermal margining and system-level fault response without external sensors. The LTC3375EUK#TRPBF also includes thermal derating guidance in its datasheet for sustained operation near TJMAX.
Can the LTC3375EUK#TRPBF operate without an I²C controller?
Yes, the LTC3375EUK#TRPBF supports full standalone operation using hardware pins. Enable inputs (EN1–EN8) accept precise voltage thresholds (400–1200mV) for autonomous sequencing. Pushbutton (PB), KILL, ON, RST, and IRQ pins provide complete power-up, reset, and fault-handling functionality without firmware. The default oscillator frequency is 2MHz (RT tied to VCC), and feedback references power up at 0.725V unless modified by external resistor dividers. The LTC3375EUK#TRPBF is explicitly designed for systems where microcontroller resources are constrained or reliability demands hardware-first power control.
What package type and thermal characteristics does the LTC3375EUK#TRPBF use?
The LTC3375EUK#TRPBF uses a 48-lead 7mm × 7mm plastic QFN package with an exposed thermal pad (Pin 49 = GND). Its thermal resistance is θJA = 34°C/W under standard JEDEC 2-layer board conditions. The device operates from –40°C to 125°C junction temperature and includes internal overtemperature protection that shuts down all regulators at 165°C. The exposed pad must be soldered to a thermally robust PCB copper plane to maintain safe operating temperatures under full 4A/channel load conditions. The LTC3375EUK#TRPBF datasheet provides detailed layout guidelines for thermal vias and copper fill.
How is output voltage programmed on the LTC3375EUK#TRPBF?
Output voltage on the LTC3375EUK#TRPBF is set via external resistor dividers connected between VOUT, FBx, and GND-standard buck topology. The internal feedback reference is digitally programmable from 0.425V to 0.820V in 25mV steps via I²C, enabling precise adjustment without changing resistors. In standalone mode, the default reference is 0.725V (705–745mV typ). The FBx pin voltage is regulated to this reference, so VOUT = VFB × (1 + R1/R2). The LTC3375EUK#TRPBF supports both Burst Mode® (for light-load efficiency) and forced continuous conduction mode, selectable per channel via I²C or hardware defaults.
LTC3375EUK#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
LTC3375EUK#TRPBF FAQ
1.How can I place an order for LTC3375EUK#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3375EUK#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3375EUK#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3375EUK#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3375EUK#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3375EUK#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3375EUK#TRPBF?
LTC3375EUK#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3375EUK#TRPBF 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#TRPBF?
For technical support, including LTC3375EUK#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3375EUK#TRPBF requirements.
6.How does Aetrix verify that LTC3375EUK#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3375EUK#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3375EUK#TRPBF?
All LTC3375EUK#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3375EUK#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3375EUK#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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