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Analog Devices Inc. LTC3375HUK#TRPBF
- Part No.:
- LTC3375HUK#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC3375HUK#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,718
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Product details
Overview
LTC3375HUK#TRPBF 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), I²C programmability, and integrated power-on reset/watchdog/pushbutton control. It targets multirail power management in high-reliability industrial and automotive systems requiring precise sequencing and thermal monitoring.
For engineers reviewing the LTC3375HUK#TRPBF datasheet, LTC3375HUK#TRPBF pinout, LTC3375HUK#TRPBF application, or LTC3375HUK#TRPBF equivalent, key selection criteria include its 48-lead 7mm × 7mm QFN package, –40°C to 150°C junction temperature rating, 0.425V–VIN output voltage range, 1MHz–3MHz programmable oscillator, and support for master-slave parallel operation of up to four channels per output rail.
Technical Context
The LTC3375HUK#TRPBF integrates eight independent synchronous buck regulators with configurable phasing (90° steps), selectable operating modes (Burst Mode® or forced continuous), and shared-inductor parallel capability. Each channel features precision enable thresholds (±20mV hysteresis), programmable undervoltage lockout on VIN and VCC, and internal current limiting (2.3A typical per PMOS).
Its digital control layer supports I²C address 0x68 (0110100[R/W]), sub-addressed register access, and status byte readback. The device includes dedicated hardware for pushbutton debouncing, KILL-initiated shutdown with 1s recovery delay, die temperature monitoring (6.75mV/°C slope), and overtemperature shutdown at 165°C with 10°C hysteresis.
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 |
| Output Current | Up to 1A per channel; up to 4A per output when combining 2–4 channels with shared inductor |
| Output Voltage Range | 0.425V to VIN - enables low-voltage core supplies and wide-range bias generation |
| Oscillator Frequency | 1MHz to 3MHz programmable via RT resistor or external SYNC - allows EMI optimization and layout flexibility |
| Operating Temperature | –40°C to 150°C junction - qualified for under-hood automotive and high-temp industrial use |
| I²C Interface | Standard-mode (400kHz) with 7-bit address 0x68 - enables centralized power system configuration and fault reporting |
| Digital Monitoring | DIE temperature sensor (150mV at 25°C, 6.75mV/°C), IRQ maskable interrupt, RST for PGOOD monitoring |
Pinout & Package
Package: 48-lead (7mm × 7mm) plastic QFN with exposed pad (Pin 49 = GND). Thermal resistance θJA = 34°C/W. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| 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 enables parallel configuration |
| VIN1–VIN8 | Independent input supply pins | Each accepts 2.25V–5.5V; bypass with ≥10µF ceramic capacitor per pin |
| SW1–SW8 | Switch node outputs | Drive external inductors; require low-ESR ceramic output capacitors |
| EN1–EN8 | Active-high enable inputs | Support autonomous sequencing via precision threshold (400–1200mV rising); hysteresis improves noise immunity |
| SDA/SCL | I²C bidirectional data/clock | Enable full digital configuration of voltage, mode, phasing, alarms, and timing parameters |
| TEMP | Analog die temperature monitor | Provides ratiometric voltage (150mV @ 25°C, +6.75mV/°C) for system-level thermal management |
| IRQ/RST | Open-drain fault indicators | IRQ signals masked/unmasked faults (UVLO, OT); RST asserts if any enabled output deviates >7.5% from target |
| ON/PB/KILL | Pushbutton interface control | Hardware-managed power-up sequencing, reset, and emergency shutdown with CT-scaled timing |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel programmability | Independent I²C control of enable state, output voltage, switching frequency, and phase offset per channel |
| Parallelable architecture | Combine up to 4 adjacent buck stages (e.g., CH1–CH4) sharing one inductor to deliver up to 4A with reduced component count |
| Precision autonomous sequencing | Enable pin thresholds with ±20mV hysteresis allow reliable power-up order without microcontroller intervention |
| Integrated system supervision | Configurable watchdog timer, pushbutton debounce, power-on reset, and RESET_ALL command simplify system-level reliability design |
| High-temp grade qualification | H-grade (–40°C to 150°C) ensures operation in engine control units, motor drives, and industrial PLCs |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Powering multiple ASICs, sensors, and CAN transceivers in an under-hood ECU with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: Primary multirail power manager delivering 1.2V, 1.8V, 2.5V, 3.3V, and 5V rails from a 5V or 12V intermediate bus. Use Value: Enables compact layout with shared inductors (e.g., 4A core rail), reduces BOM count by 60% vs discrete solutions, and meets AEC-Q100 Grade 0 thermal specs via H-grade rating. | Use Scenario: Supplying FPGA I/O banks, core logic, ADC references, and isolated communication interfaces in a DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Centralized power controller managing startup sequence, brownout detection, and thermal derating across 8 subsystems. Use Value: Eliminates need for external sequencers and supervisors; I²C telemetry enables predictive maintenance via real-time die temperature and fault logging. |
| Telecom Base Station Radio Unit | Medical Imaging Sensor Array |
Use Scenario: Providing tightly regulated, low-noise supplies to RF front-end ICs, ADCs, and FPGAs in a 5G massive MIMO radio unit. IC Role / Device Role / Timing Role: High-efficiency, low-EMI power source with synchronized switching (via SYNC pin) to minimize beat frequencies across 8 RF chains. Use Value: Achieves >90% efficiency at 1A load (VIN=3.3V, VOUT=1.8V) and supports 2MHz–3MHz synchronization to avoid sensitive IF bands. | Use Scenario: Powering distributed CMOS image sensor nodes in portable ultrasound or X-ray detectors requiring ultra-low noise and fast transient response. IC Role / Device Role / Timing Role: Low-dropout, high-PSRR buck regulator delivering clean 1.2V and 2.8V rails with Burst Mode® for standby power reduction. Use Value: Delivers <100µVPP output ripple in Burst Mode®, supports 100mA→700mA load steps with <100µs recovery (1A channel), and meets IEC 60601 leakage current limits via isolated enable control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65218D0RSLR | 6-channel, fixed 3.3V/1.8V/1.5V/1.2V outputs; no I²C programmability; max 3A total output | Targeted at Sitara AM335x/AM437x processors; lacks per-channel voltage/frequency control and parallel capability | Select when processor-specific integration and minimal firmware overhead are prioritized over flexibility |
| MAX20029ATPA/VY+ | 4-channel, 3A/2A/2A/2A; automotive AEC-Q100 Grade 1 (–40°C to 125°C); no die temp monitor or IRQ | Optimized for ADAS camera modules; includes spread-spectrum and CISPR-25 compliance features | Select for cost-sensitive, lower-channel-count automotive vision systems requiring EMI certification |
Compared with TPS65218D0RSLR and MAX20029ATPA/VY+, the LTC3375HUK#TRPBF offers superior configurability (8 independent channels, I²C, parallel operation), extended temperature range (150°C vs 125°C), and integrated thermal monitoring-making it optimal for high-density, thermally constrained, or field-upgradable systems.
Availability
LTC3375HUK#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and telecom base station radio units requiring stable component supply, long-term lifecycle support, and guaranteed high-temperature performance.
Supply support for LTC3375HUK#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, 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 LTC3375HUK#TRPBF belongs to ADI's Power by Linear™ family of highly integrated, digitally configurable power management ICs designed for complex multirail systems in automotive, industrial, and communications infrastructure where reliability, thermal resilience, and software-defined power are critical.
FAQ
What is the maximum junction temperature specification for the LTC3375HUK#TRPBF?
The LTC3375HUK#TRPBF is rated for a maximum junction temperature of 150°C, with overtemperature shutdown activating at 165°C and 10°C hysteresis. This H-grade qualification makes the LTC3375HUK#TRPBF suitable for under-hood automotive applications and high-power industrial environments where ambient temperatures exceed 105°C. Derating guidelines apply above 125°C to ensure long-term reliability.
How does the LTC3375HUK#TRPBF support parallel operation of multiple buck channels?
The LTC3375HUK#TRPBF supports parallel operation by allowing adjacent channels (e.g., CH1–CH4) to share a single inductor and output capacitor. This is achieved by connecting the FB pin of a slave channel (e.g., FB2) directly to the VIN pin of the master (e.g., VIN1). The LTC3375HUK#TRPBF automatically configures phase offsets (90° steps) and current sharing, enabling up to 4A per output rail while maintaining regulation accuracy and thermal balance.
Can the LTC3375HUK#TRPBF be used without an I²C controller?
Yes, the LTC3375HUK#TRPBF operates fully in standalone mode using its dedicated enable pins (EN1–EN8), pushbutton (PB), KILL, and ON signals. Power-up defaults configure all channels to 2MHz switching frequency, 0.8V output (via internal 725mV reference), and Burst Mode® operation. I²C is optional for advanced configuration-voltage trimming, phasing, alarm thresholds, and timing parameters-but not required for basic functionality.
What is the purpose of the CT pin on the LTC3375HUK#TRPBF?
The CT pin on the LTC3375HUK#TRPBF sets a global time constant that scales multiple hardware-timed functions: PB debounce, ON pulse width, KILL recovery delay, RST assertion delay, and IRQ pulse width. A 0.01µF capacitor yields nominal timing values (e.g., 200ms RST delay); increasing capacitance linearly extends all times. This eliminates the need for external timers or firmware-based delays in pushbutton-driven power sequencing.
Does the LTC3375HUK#TRPBF include protection features beyond overtemperature shutdown?
Yes, the LTC3375HUK#TRPBF includes comprehensive protection: per-channel VIN undervoltage lockout (1.95V falling, 2.05V rising), VCC UVLO (2.35V falling, 2.45V rising), open-drain IRQ and RST fault indicators, PMOS/NMOS overcurrent limiting (2.3A typical), and automatic soft-start. It also supports system-level supervision via watchdog timeout (200ms WDO pulse), pushbutton-initiated reset, and KILL-triggered forced shutdown with 1-second hold-off-ensuring robust operation in mission-critical systems.
LTC3375HUK#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)
LTC3375HUK#TRPBF FAQ
1.How can I place an order for LTC3375HUK#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3375HUK#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 LTC3375HUK#TRPBF reliable?
The price and inventory of LTC3375HUK#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3375HUK#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3375HUK#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3375HUK#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3375HUK#TRPBF?
LTC3375HUK#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3375HUK#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 LTC3375HUK#TRPBF?
For technical support, including LTC3375HUK#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3375HUK#TRPBF requirements.
6.How does Aetrix verify that LTC3375HUK#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3375HUK#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 LTC3375HUK#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3375HUK#TRPBF?
All LTC3375HUK#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3375HUK#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 LTC3375HUK#TRPBF part is unused and in its original packaging.
Return procedure for LTC3375HUK#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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