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Analog Devices Inc. LTC3375HUK#PBF
- Part No.:
- LTC3375HUK#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC3375HUK#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
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Product details
Overview
LTC3375HUK#PBF from Analog Devices (formerly Linear Technology) is a digitally programmable 8-channel synchronous buck DC/DC regulator IC with independent 2.25V–5.5V input supplies per channel, 1A per channel (up to 4A via parallel configuration), 0.425V–VIN output voltage range, and I²C/standalone control. It enables precise multirail power sequencing in space-constrained industrial and automotive systems.
For engineers reviewing the LTC3375HUK#PBF datasheet, LTC3375HUK#PBF pinout, LTC3375HUK#PBF application, or LTC3375HUK#PBF equivalent, key selection criteria include its 48-lead 7mm × 7mm QFN package, –40°C to 150°C operating junction temperature, programmable oscillator (1–3 MHz), die temperature monitoring with maskable IRQ, and master-slave parallel capability for up to 4A per output rail.
Technical Context
The LTC3375HUK#PBF integrates eight independent synchronous buck regulators, each with PMOS/NMOS power stages (RPMOS = 335 mΩ, RNMOS = 315 mΩ), programmable soft-start (1 ms default), and selectable operating modes (Burst Mode® or forced continuous). Each channel supports autonomous enable threshold precision (±30 mV hysteresis) and independent feedback regulation (705–820 mV default VFB range).
Its digital control architecture supports I²C address 0x64 (0110100[R/W]), 400 kHz bus speed, and sub-addressed register access for configuring phasing (90° steps), overtemperature warning thresholds (110–140°C), power-on reset timing, watchdog timeout (200 ms WDO pulse), and global oscillator frequency via RT resistor or SYNC pin synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per buck channel - supports independent supply rails or shared inputs for rail consolidation. |
| Output Current Capability | Up to 1A per channel; up to 4A per output via parallel configuration of up to four channels - enables high-current rails without external current-sharing circuitry. |
| Feedback Voltage Range | 0.425V to VIN - allows low-voltage core supplies (e.g., 0.8V, 1.2V) and adjustable outputs using standard resistor dividers. |
| Oscillator Frequency | 1MHz to 3MHz programmable via RT resistor or external SYNC signal - permits EMI optimization and layout-driven frequency selection. |
| Junction Temperature Range | –40°C to 150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| I²C Interface | Standard-mode (400 kHz), 7-bit address 0x64 - enables centralized system-level power management and fault reporting. |
| Die Temperature Monitoring | VTEMP = 150 mV at 25°C, slope = 6.75 mV/°C - provides analog die temperature readback and programmable IRQ assertion at 110–140°C. |
Pinout & Package
The LTC3375HUK#PBF is housed in a thermally enhanced 48-lead 7mm × 7mm plastic QFN package with exposed pad (Pin 49 = GND), requiring soldering to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 | Feedback Inputs | Resistor-divider nodes for output voltage regulation; shorting FBx to VINy configures master-slave parallel operation. |
| VIN1–VIN8 | Independent Input Supplies | Each accepts 2.25V–5.5V; must be bypassed with ≥10µF ceramic capacitor; can be tied together or powered separately. |
| SW1–SW8 | Switch Nodes | Connect to external inductors; require low-ESR ceramic output capacitors and careful high-frequency layout. |
| EN1–EN8 | Enable Inputs | Active-high logic; precision thresholds (380–1200 mV) support autonomous sequencing without microcontroller intervention. |
| IRQ, RST | Open-Drain Fault Outputs | IRQ signals undervoltage, overtemperature, or unmasked faults; RST asserts when any enabled output drops >7.5% below target. |
| SDA, SCL | I²C Data/Clock | Support standard-mode communication; internal pull-ups not provided - external pull-ups required. |
| ON, PB, KILL | Pushbutton Interface | Debounced ON output, active-low PB input, and system-killing KILL input - enable hardware-based power-up/down control. |
| CT, RT, SYNC | Oscillator Timing | CT sets timing constants for pushbutton, reset, and watchdog functions; RT programs oscillator frequency; SYNC accepts external clock for synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel programmability | Independent enable, output voltage, mode (Burst/Continuous), and phasing control per channel via I²C or GPIO - eliminates need for multiple discrete regulators. |
| Parallelable architecture | Up to four channels per output rail with shared inductor - reduces component count and board area for high-current rails (e.g., 4A @ 1.2V). |
| Digital temperature monitoring | Analog TEMP pin with ±2°C accuracy (25°C to 125°C) and programmable IRQ warning thresholds - enables proactive thermal derating in sealed enclosures. |
| Hardware power sequencing | Pushbutton (PB), ON, KILL, and RST pins with CT-scaled timing - supports reliable cold-start, safe shutdown, and watchdog recovery without firmware dependency. |
| High-temp grade packaging | H-grade qualification (–40°C to 150°C TJ) with θJA = 34°C/W - ensures stable operation in engine control units and motor drives. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering multiple ASICs, sensors, and CAN transceivers in an under-hood ECU with ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Primary multirail power manager delivering 1.2V (core), 3.3V (I/O), 5V (analog), and 12V (actuator bias) from a 12V battery input via intermediate buck stages. Use Value: Single-chip solution replaces 6+ discrete buck converters, reduces thermal hotspots via interleaved phasing, and enables die temperature-triggered limp-home mode. | Use Scenario: Supplying isolated fieldbus interfaces (RS-485, Profibus), FPGA configuration banks, and analog sensor front-ends in a DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Centralized power supervisor coordinating startup sequence across 8 independent subsystems with configurable delay and fault masking. Use Value: Eliminates external sequencers and discrete supervisors; I²C status readback enables predictive maintenance via temperature and PGOOD monitoring. |
| 5G Small Cell Baseband Unit | Medical Imaging Sensor Array |
Use Scenario: Delivering tightly regulated, low-noise supplies to RF transceivers, ADCs, and FPGAs in compact 5G small cell radios with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency, synchronized multi-output regulator with programmable 2MHz base frequency and 90° phase offsets to minimize input ripple current. Use Value: Reduces input capacitance by 40% vs. unsynchronized converters; Burst Mode® extends standby battery life in remote deployments. | Use Scenario: Powering time-of-flight (ToF) sensor pixels, analog front-end amplifiers, and digital processing cores in portable ultrasound probes. IC Role / Device Role / Timing Role: Low-noise, fast-transient multirail source supporting simultaneous 1.8V (digital), 2.5V (ADC), and 3.3V (interface) rails with <100 µs load-step response. Use Value: Integrated soft-start and programmable PGOOD delays prevent imaging artifacts during power-up; die temperature tracking prevents thermal drift in gain calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4485GQ-AEC1-Z | 4-channel, 3A/channel, AEC-Q100 Grade 1 (–40°C to 125°C), no I²C, fixed 2.2MHz fSW | Lacks per-channel programmability and temperature monitoring; limited to simpler 4-rail systems without sequencing needs. | Select when cost-sensitive automotive applications require only basic 4-rail regulation without digital supervision. |
| TPS650860RSLR | 6-channel, 3A max total, integrated LDOs, I²C, –40°C to 105°C, 64-pin VQFN | Lower current per channel, narrower temp range, includes LDOs but no parallel capability or die temperature analog output. | Prefer for compute-heavy applications needing mixed buck/LDO outputs where thermal margin exceeds 125°C. |
Compared with MPQ4485GQ-AEC1-Z and TPS650860RSLR, the LTC3375HUK#PBF uniquely combines 8 independent programmable channels, 150°C operation, analog die temperature sensing, and true master-slave parallelization - making it the only option for high-density, thermally demanding, and digitally supervised multirail systems.
Availability
LTC3375HUK#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, 5G small cell baseband units, and medical imaging sensor arrays requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3375HUK#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 LTC3375HUK#PBF belongs to Linear's multichannel programmable power management IC family, designed specifically for space-constrained systems requiring autonomous sequencing, thermal resilience, and flexible rail configuration without microcontroller overhead.
FAQ
What is the maximum output current achievable per rail using the LTC3375HUK#PBF?
The LTC3375HUK#PBF supports up to 1A per individual buck channel. By combining up to four channels in master-slave configuration (e.g., tying FB2 to VIN1, FB3 to VIN2, etc.), a single output rail can deliver up to 4A with shared inductor and output capacitor. The PMOS current limit scales accordingly: 2.3A (2-channel), 6.9A (3-channel), and 9.2A (4-channel) per combined stage, as verified in the Electrical Characteristics table.
Does the LTC3375HUK#PBF support I²C communication at 1 MHz?
No, the LTC3375HUK#PBF supports standard-mode I²C only, with a maximum clock frequency of 400 kHz as specified in the Electrical Characteristics table. Attempting 1 MHz operation violates tLOW/tHIGH timing requirements (minimum 1.3 µs low period, 0.6 µs high period) and may result in communication failure or bus lockup.
How is the die temperature measured and reported by the LTC3375HUK#PBF?
The LTC3375HUK#PBF provides an analog die temperature voltage on the TEMP pin: VTEMP = 150 mV at 25°C with a linear slope of 6.75 mV/°C. This output is usable directly for system-level thermal monitoring. Additionally, the part supports programmable overtemperature warning thresholds (DT[1:0] bits) that assert the IRQ pin low at 110°C, 125°C, or 140°C - all confirmed in the Electrical Characteristics section.
Can the LTC3375HUK#PBF operate with input voltages below 2.25V on any channel?
No. The absolute minimum input voltage for each buck channel is 2.25V, as defined in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this threshold causes VIN undervoltage lockout (UVLO) with rising threshold at 2.05V and falling threshold at 1.95V - verified across temperature. Using <2.25V risks regulation loss and potential damage during transient conditions.
What package type and thermal performance does the LTC3375HUK#PBF use?
The LTC3375HUK#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 under standard JEDEC 2-layer board conditions. The H-grade variant is qualified for –40°C to 150°C junction temperature, enabling deployment in high-ambient environments where sustained operation above 125°C would degrade lifetime of lower-grade variants.
LTC3375HUK#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)
LTC3375HUK#PBF FAQ
1.How can I place an order for LTC3375HUK#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3375HUK#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 LTC3375HUK#PBF reliable?
The price and inventory of LTC3375HUK#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3375HUK#PBF is usually 5 days.
3.What payment methods are accepted for LTC3375HUK#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3375HUK#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3375HUK#PBF?
LTC3375HUK#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3375HUK#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 LTC3375HUK#PBF?
For technical support, including LTC3375HUK#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3375HUK#PBF requirements.
6.How does Aetrix verify that LTC3375HUK#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3375HUK#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 LTC3375HUK#PBF meets industry standards.
7.What is the process for return or replacement of LTC3375HUK#PBF?
All LTC3375HUK#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3375HUK#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 LTC3375HUK#PBF part is unused and in its original packaging.
Return procedure for LTC3375HUK#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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