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Analog Devices Inc. LTC3375EUK#PBF
- Part No.:
- LTC3375EUK#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC3375EUK#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:135
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Product details
Overview
LTC3375EUK#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 and standalone 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 voltage range, and integrates power-on reset, watchdog timer, and die temperature monitoring - used in multirail power management for FPGA, SoC, and industrial control systems.
For engineers reviewing the LTC3375EUK#PBF datasheet, LTC3375EUK#PBF pinout, LTC3375EUK#PBF application, or LTC3375EUK#PBF equivalent, key selection considerations include per-channel enable precision (±30mV hysteresis), programmable oscillator frequency (1–3MHz), I²C-addressable phasing (90° steps), thermal warning threshold configurability (110°C–140°C), and combined-buck current limit scaling (up to 9.2A for 4-phase).
Technical Context
The LTC3375EUK#PBF implements eight independent synchronous buck regulators with integrated PMOS/NMOS power stages (RPMOS = 335mΩ, RNMOS = 315mΩ), each supporting forced continuous or Burst Mode® operation. Its global oscillator can be set via RT resistor (1–3MHz) or synchronized externally via SYNC pin, with automatic slope compensation adaptation.
Power sequencing is managed through dedicated logic pins (ON, PB, KILL, RST, IRQ) and I²C-configurable timers (CT capacitor-scaled). The device includes a VCC shunt regulator (2.7–5.5V), temperature sensor (6.75mV/°C slope), and maskable fault reporting - enabling autonomous startup, system-level fault response, and thermal-aware power delivery without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 8 independent synchronous buck regulators, each rated for 1A output current |
| Input voltage range | 2.25V to 5.5V per VIN pin - supports mixed-rail inputs with no shared supply requirement |
| Output voltage range | 0.425V to VIN - enables low-voltage core rails (e.g., 0.8V, 1.2V) with high accuracy (±1% over temp) |
| Oscillator frequency | Programmable 1MHz to 3MHz (2MHz default) - sets switching speed and inductor size trade-off |
| Thermal warning threshold | Configurable via I²C: 110°C, 125°C, 140°C, or disabled - triggers IRQ for proactive thermal management |
| Enable threshold precision | VHI = 400–420mV (enabled state), VHI_ALLOFF = 400–1200mV (all-off state) - ensures reliable autonomous sequencing |
| I²C interface | Standard-mode (400kHz), 7-bit address 0x34 - supports register-level control of voltage, mode, phasing, and alarms |
Pinout & Package
Package: 48-lead 7mm × 7mm QFN with exposed thermal pad (Pin 49 = GND). Pin pitch: 0.5mm. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 | Feedback input for buck channels 1–8 | Connects to resistor divider; sets output voltage; shorting FBx to VINx combines channels |
| VIN1–VIN8 | Independent input supply for each buck channel | Each accepts 2.25V–5.5V; bypassed individually with ≥10µF ceramic capacitor |
| SW1–SW8 | Switch node for buck channels 1–8 | Connects to external inductor; requires low-ESR layout for efficiency and EMI control |
| EN1–EN8 | Active-high enable for buck channels 1–8 | Thresholds differ by state (all-off vs. active); supports precise power-up sequencing |
| IRQ, RST | Open-drain fault outputs | IRQ signals undervoltage, overtemperature, or unmasked faults; RST asserts if any enabled output drops >7.5% |
| SDA, SCL | I²C bidirectional data and clock | Supports configuration and status readback; 400kHz max; VIH = 1.2V, VOL = 0.4V @ 3mA |
| ON, PB, KILL | Pushbutton interface control | ON is open-drain output; PB is active-low input with internal 420kΩ pull-up; KILL forces shutdown for 1s (CT-scaled) |
| TEMP | Analog temperature monitor output | Linear 150mV at 25°C + 6.75mV/°C; used for external monitoring or closed-loop thermal throttling |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel digital programming | I²C or standalone mode configures voltage, enable, operating mode, and phasing - eliminates external DACs or jumpers |
| Configurable multi-phase combining | Up to four adjacent buck channels (e.g., CH1–CH4) can share one inductor for 4A output - reduces component count and board area |
| Autonomous power sequencing | Integrated pushbutton debouncing, ON timing, KILL hold-off, and CT-scaled delays enable reliable turn-on/off without MCU involvement |
| Thermal fault management | Programmable die temperature warning (110°C–140°C) with maskable IRQ output - allows early thermal mitigation before shutdown |
| High-accuracy enable thresholds | VHI = 400–420mV (active), VHI_ALLOFF = 400–1200mV (all-off) - supports robust self-starting and rail-ordering in distributed supplies |
| Low-quiescent-current operation | IVCC_ALLOFF = 11–25µA (all regulators off); IVCC = 50–325µA (at least one active) - extends battery life in always-on subsystems |
Applications
| FPGA Core & Auxiliary Power | Automotive ADAS Domain Controller |
|---|---|
Use Scenario: Powering heterogeneous FPGA rails (core, I/O, transceiver, auxiliary) requiring tight voltage tolerance, sequencing, and dynamic load response. IC Role / Device Role / Timing Role: Primary multichannel PMIC delivering 8 independently regulated outputs; manages power-up sequence via EN pins and monitors thermal headroom via TEMP/IRQ. Use Value: Eliminates need for 5+ discrete regulators and sequencer IC; supports 1A–4A per rail with single-inductor combining for compact, thermally optimized layout. |
Use Scenario: Supplying multiple SoC cores, memory interfaces, and sensor preamps in radar or camera ECUs with automotive temperature grade and fault resilience. IC Role / Device Role / Timing Role: High-reliability power manager with overtemperature warning, reset assertion on rail fault, and KILL-initiated safe shutdown per ISO 26262 ASIL-B requirements. Use Value: Meets –40°C to 125°C junction range (LTC3375EUK#PBF); provides IRQ/RST signaling for ECU watchdog supervision and thermal derating without software dependency. |
| Industrial PLC I/O Module | 5G Small Cell Baseband Unit |
Use Scenario: Providing isolated, stable power to analog front-end, microcontroller, communication interface, and field-side sensors in modular PLC backplanes. IC Role / Device Role / Timing Role: Centralized power hub with independent VIN supplies per channel - accommodates mixed 3.3V, 5V, and 2.5V input sources across module slots. Use Value: Enables flexible, hot-swappable I/O design; per-rail enable/disable via I²C simplifies firmware-controlled power gating during diagnostics or maintenance. |
Use Scenario: Delivering tightly regulated, low-noise power to RF transceivers, DSPs, and memory in space-constrained 5G small cell units with strict thermal limits. IC Role / Device Role / Timing Role: Multirail DC/DC controller with programmable phasing (90° steps) and Burst Mode® - minimizes input ripple and improves light-load efficiency. Use Value: Reduces EMI through phase interleaving; achieves >90% efficiency at 100mA load (Burst Mode®) and <1% output voltage drift over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS650861RSLR | 6-channel, fixed 1.2A per channel; no per-channel VIN independence; integrated LDOs; TI-specific PMBus interface | Targeted at Intel Atom/SoC platforms with predefined rail maps; less flexible for custom multirail designs | Choose when platform compatibility and integrated LDOs outweigh need for 8 channels or independent VINs. |
| ISL91211BIKZ-T7A | 4-channel, 3A/2A/2A/2A configurable; supports only 2.5–5.5V VIN; Renesas R2Bus interface; no thermal warning programmability | Optimized for mobile AP/SoC with high-current core rails; lacks autonomous pushbutton control and fine-grained thermal alarm settings | Prefer for high-current, low-pin-count designs where 4 channels suffice and I²C is not required. |
Compared with TPS650861RSLR and ISL91211BIKZ-T7A, the LTC3375EUK#PBF uniquely delivers 8 fully independent buck channels with per-VIN flexibility, programmable thermal warning thresholds, and hardware-based pushbutton sequencing - making it optimal for custom, thermally constrained, or mixed-input multirail systems where configurability and autonomy are critical.
Availability
LTC3375EUK#PBF is available at Aetrix Electronics and suitable for FPGA power management, automotive ADAS domain controllers, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to 125°C operation.
Supply support for LTC3375EUK#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3375EUK#PBF belongs to Linear's multichannel programmable PMIC family, designed specifically for complex, space-constrained systems needing autonomous, thermally aware, and highly configurable power delivery without host processor overhead.
FAQ
What is the maximum output current achievable per channel using the LTC3375EUK#PBF?
The LTC3375EUK#PBF supports up to 1A per individual buck channel. When configured in parallel (e.g., channels 1–4), it delivers up to 4A per combined output using a single inductor. Current limits scale linearly: 2-channel = 4.6A, 3-channel = 6.9A, 4-channel = 9.2A - verified under forced continuous mode with proper thermal design. The LTC3375EUK#PBF datasheet specifies these values in the "Buck Regulators Combined" section.
Does the LTC3375EUK#PBF support independent input supplies for each buck channel?
Yes, the LTC3375EUK#PBF accepts independent 2.25V to 5.5V input voltages on VIN1 through VIN8. Each channel must be bypassed with ≥10µF ceramic capacitance. This architecture enables mixed-rail systems - for example, powering Channel 1 from a 3.3V supply while Channel 5 draws from a 5V source - without interdependence. The LTC3375EUK#PBF pin functions document confirms this per-pin VIN assignment.
How is thermal monitoring implemented in the LTC3375EUK#PBF?
The LTC3375EUK#PBF features an on-die temperature sensor with linear analog output on the TEMP pin (150mV at 25°C, +6.75mV/°C). Die temperature warning thresholds (110°C, 125°C, 140°C, or disabled) are programmable via I²C; crossing a set threshold pulls IRQ low. Overtemperature shutdown occurs at 165°C with 10°C hysteresis. All thermal parameters are specified in the Electrical Characteristics table of the LTC3375EUK#PBF datasheet.
Can the LTC3375EUK#PBF operate without an I²C controller?
Yes, the LTC3375EUK#PBF supports full standalone operation using its dedicated logic pins (EN1–EN8, ON, PB, KILL, RST). Power-up defaults configure all channels to 0.85V output, 2MHz switching, and Burst Mode®. Pushbutton events trigger ON timing and sequencing; KILL forces shutdown; IRQ and RST provide fault signaling. I²C is optional for advanced configuration - the LTC3375EUK#PBF functions autonomously out-of-box.
What package type and thermal characteristics does the LTC3375EUK#PBF use?
The LTC3375EUK#PBF uses a 48-lead 7mm × 7mm QFN package with exposed thermal pad (Pin 49 = GND). Its thermal resistance is θJA = 34°C/W (JEDEC standard PCB). The device operates from –40°C to 125°C junction temperature and includes overtemperature protection that activates at 165°C. The exposed pad must be soldered to PCB copper for thermal and electrical performance - specified in the Package Description section of the LTC3375EUK#PBF datasheet.
LTC3375EUK#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)
LTC3375EUK#PBF FAQ
1.How can I place an order for LTC3375EUK#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3375EUK#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 LTC3375EUK#PBF reliable?
The price and inventory of LTC3375EUK#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3375EUK#PBF is usually 5 days.
3.What payment methods are accepted for LTC3375EUK#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3375EUK#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3375EUK#PBF?
LTC3375EUK#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3375EUK#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 LTC3375EUK#PBF?
For technical support, including LTC3375EUK#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3375EUK#PBF requirements.
6.How does Aetrix verify that LTC3375EUK#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3375EUK#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 LTC3375EUK#PBF meets industry standards.
7.What is the process for return or replacement of LTC3375EUK#PBF?
All LTC3375EUK#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3375EUK#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 LTC3375EUK#PBF part is unused and in its original packaging.
Return procedure for LTC3375EUK#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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