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Analog Devices Inc. LTC3375IUK#TRPBF
- Part No.:
- LTC3375IUK#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC3375IUK#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,123
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Product details
Overview
LTC3375IUK#TRPBF 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 parallelizable architecture supporting up to 4A per output using shared inductors. It operates from 2.25V–5.5V input per channel and delivers 0.425V–VIN output voltage range, targeting multirail power management in industrial and automotive systems.
For engineers reviewing the LTC3375IUK#TRPBF datasheet, LTC3375IUK#TRPBF pinout, LTC3375IUK#TRPBF application, or LTC3375IUK#TRPBF equivalent, key selection criteria include per-channel enable precision (±30mV hysteresis), programmable oscillator frequency (1–3MHz), die temperature monitoring with maskable IRQ, pushbutton sequencing support, and 48-lead 7mm × 7mm QFN package thermal performance.
Technical Context
The LTC3375IUK#TRPBF integrates eight independent synchronous buck regulators, each with PMOS/NMOS power stages (RDS(ON) = 335mΩ/315mΩ), programmable feedback reference (405–820mV), and selectable operating modes (Burst Mode® or forced continuous). All channels share a common VCC shunt regulator (2.7–5.5V) and internal oscillator, configurable via RT resistor or external SYNC signal.
It supports master-slave configuration across adjacent channels (e.g., CH1+CH2, CH3+CH4) for combined current delivery (2A/3A/4A), with per-channel phasing control (90° steps), soft-start (1ms default), and independent enable thresholds (380–1200mV rising). Fault monitoring includes undervoltage lockout on VIN/VCC, overtemperature shutdown (165°C), and die temperature warning (programmable 110–140°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per channel - supports diverse rail inputs including 3.3V, 5V, and low-voltage battery sources |
| Output Current per Channel | Up to 1A - enables compact point-of-load regulation without external current boosting |
| Max Combined Output | 4A per output group - achieved by paralleling up to four adjacent buck stages with shared inductor |
| Oscillator Frequency | 1MHz to 3MHz (programmable via RT resistor or SYNC pin) - allows EMI optimization and layout flexibility |
| Feedback Reference Voltage | 405mV to 820mV (I²C-programmable) - supports precise output voltage setting from 0.425V to full VIN |
| Digital Interface | I²C-compatible (400kHz) with 7-bit address 0x34 - enables system-level power sequencing and real-time fault reporting |
| Operating Temp Range | –40°C to +125°C - qualified for industrial and extended-temperature automotive applications |
| Package | 48-lead 7mm × 7mm QFN with exposed pad - provides low thermal resistance (θJA = 34°C/W) for high-power density designs |
Pinout & Package
Package: 48-lead plastic QFN (7mm × 7mm, 0.25mm pitch), exposed thermal pad (Pin 49 = GND), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 (Pins 1,6,7,12,25,30,31,36) | Feedback input for buck regulators 1–8 | Connects to resistor divider to set output voltage; shorting FBn to VINn enables channel combining |
| VIN1–VIN8 (Pins 2,5,8,11,26,29,32,35) | Independent input supply for each buck channel | Each accepts 2.25V–5.5V; bypass required with ≥10µF ceramic capacitor per input |
| SW1–SW8 (Pins 3,4,9,10,27,28,33,34) | Switch node for buck power stage | Connects to external inductor; requires low-inductance layout to minimize switching losses |
| EN1–EN8 (Pins 48,47,14,13,24,23,38,37) | Active-high enable for buck regulators 1–8 | Threshold: 380–1200mV rising; supports autonomous sequencing or I²C control |
| IRQ (Pin 15), RST (Pin 16) | Open-drain fault indicator outputs | IRQ asserts on unmasked faults (UVLO, overtemp); RST asserts when any enabled output deviates >7.5% from target |
| SDA/SCL (Pins 46,45) | I²C bidirectional data/clock | Supports standard-mode (400kHz) communication; requires pull-ups to VCC or external supply |
| TEMP (Pin 44) | Analog die temperature monitor | Outputs 150mV at 25°C with 6.75mV/°C slope - used for system thermal management |
| CT (Pin 17) | Timing capacitor connection | Defines time constants for PB, ON, KILL, RST, and IRQ timing functions (e.g., tPB_ON = 200ms typical) |
Key Features
| Feature | Design Value |
|---|---|
| 8 independent 1A buck regulators | Enables fully decoupled multirail power delivery without cross-regulation or shared component constraints |
| Configurable channel combining (up to 4A) | Reduces BOM count and PCB area by allowing adjacent channels to drive single output with shared inductor |
| Programmable per-channel phasing (90° steps) | Minimizes input ripple current and reduces bulk capacitance requirements in multi-output systems |
| Digital power sequencing via I²C | Allows precise startup/shutdown order, dynamic voltage scaling, and runtime reconfiguration without hardware changes |
| Integrated pushbutton interface with debounced ON/KILL/PB | Eliminates external microcontroller dependency for basic power-on-reset, watchdog, and emergency shutdown functions |
| Dual-mode operation (Burst Mode® / forced continuous) | Optimizes light-load efficiency (<10mA) while maintaining tight regulation under transient loads up to 1A |
Applications
| Industrial PLC I/O Modules | Automotive ADAS Domain Controllers |
|---|---|
Use Scenario: Powering mixed-signal FPGA, ADCs, DACs, and isolated CAN transceivers in modular I/O backplanes with strict rail sequencing and thermal limits. IC Role / Device Role / Timing Role: Primary multichannel PMIC providing independently sequenced 1.2V, 1.8V, 2.5V, 3.3V, and 5V rails with real-time die temperature monitoring. Use Value: Eliminates need for six discrete buck converters and associated timing logic; reduces board area by 42% versus discrete solution while enabling I²C-based firmware-controlled rail margining. | Use Scenario: Supplying vision processor SoCs, radar MMICs, and sensor fusion MCUs in centralized ADAS ECUs requiring functional safety-aware power management. IC Role / Device Role / Timing Role: Safety-critical power supervisor delivering ASIL-B compliant sequencing, fault logging via IRQ/RST, and watchdog-triggered reset coordination across subsystems. Use Value: Meets ISO 26262 diagnostic coverage requirements through programmable overtemperature warning (125°C threshold), UVLO detection, and RESET_ALL command for safe state recovery. |
| Communications Baseband Units | Medical Imaging Signal Chains |
Use Scenario: Generating low-noise analog and digital supplies for RF transceivers, high-speed SerDes, and memory interfaces in 5G macrocell baseband cards. IC Role / Device Role / Timing Role: High-efficiency multirail source with synchronized switching (via SYNC pin) to suppress beat frequencies and reduce conducted EMI in dense RF environments. Use Value: Achieves >90% peak efficiency at 1A load across 1–3MHz range; phase alignment reduces input ripple by 65% versus unsynchronized operation. | Use Scenario: Powering ultra-low-noise amplifiers, high-resolution ADCs, and FPGA-based image processors in portable ultrasound and MRI front-end modules. IC Role / Device Role / Timing Role: Precision analog power manager delivering sub-10mV load regulation (0–1A) and <10µVRMS output noise in Burst Mode®. Use Value: Maintains 16-bit ENOB integrity across full load range; integrated soft-start prevents inrush-induced sensor saturation during power-up. |
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 | 4-channel, max 3A total output; fixed 1.8V/3.3V outputs; no I²C programmability; integrated LDOs | Targeted at Sitara AM335x/AM437x processors; lacks per-channel enable precision and die temp monitoring | Select when processor-specific integration and lower cost outweigh need for flexible rail count and programmability |
| ISL9122AIRZ-T7A | 4-channel, max 2A per output; supports only 2-phase interleaving; no pushbutton interface or watchdog | Optimized for mobile AP SoCs; missing CT-timed sequencing, IRQ masking, and master-slave combining | Choose for space-constrained portable designs where I²C control and thermal monitoring are secondary to footprint minimization |
Compared with TPS65218D0RSLR and ISL9122AIRZ-T7A, the LTC3375IUK#TRPBF offers superior channel count (8 vs 4), higher per-channel current (1A vs 0.8A typical), full I²C configurability, and integrated system-level supervision (PB/KILL/WD), making it optimal for complex industrial and automotive power architectures requiring scalability and diagnostics.
Availability
LTC3375IUK#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS controllers, 5G baseband units, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade compliance.
Supply support for LTC3375IUK#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3375IUK#TRPBF belongs to Linear's µPower® multichannel regulator family, designed specifically for space-constrained, thermally demanding applications requiring fine-grained digital control of multiple independent or combined power rails.
FAQ
What is the maximum output current achievable per channel using LTC3375IUK#TRPBF?
The LTC3375IUK#TRPBF supports up to 1A per individual buck channel. When configured in master-slave mode, adjacent channels (e.g., CH1+CH2 or CH1+CH2+CH3+CH4) can be combined to deliver up to 4A per output using a single shared inductor. The PMOS current limit scales accordingly: 2.3A (1-channel), 4.6A (2-channel), 6.9A (3-channel), and 9.2A (4-channel), as specified in the Electrical Characteristics table.
Does LTC3375IUK#TRPBF support both Burst Mode® and forced continuous operation?
Yes, the LTC3375IUK#TRPBF supports both Burst Mode® operation for high light-load efficiency and forced continuous conduction mode for low-noise, constant-frequency operation. Mode selection is programmable per channel via I²C register bits. In Burst Mode®, quiescent current drops to 18µA (typical) with VIN = 3.3V; in forced continuous mode, typical VCC supply current is 85µA at 2MHz switching frequency.
How is die temperature monitored and reported on LTC3375IUK#TRPBF?
The LTC3375IUK#TRPBF provides analog die temperature monitoring via the TEMP pin (Pin 44), outputting 150mV at 25°C with a linear slope of 6.75mV/°C. A programmable die temperature warning threshold (110°C, 125°C, 140°C, or disabled) triggers the open-drain IRQ pin when exceeded. Overtemperature shutdown occurs at 165°C with 10°C hysteresis, ensuring robust thermal protection without external sensors.
Can LTC3375IUK#TRPBF be used without an I²C controller?
Yes, the LTC3375IUK#TRPBF supports standalone operation using its dedicated enable pins (EN1–EN8), pushbutton interface (PB, ON, KILL), and power-up defaults. All eight buck regulators start with factory-default output voltages (set by internal feedback references), 2MHz oscillator frequency, and Burst Mode® enabled. I²C is optional for advanced configuration such as voltage trimming, phasing, fault masking, or dynamic sequencing.
What is the purpose of the CT pin on LTC3375IUK#TRPBF?
The CT pin (Pin 17) connects to a timing capacitor that sets time constants for multiple system-level functions: PB debounce timing (tPB_ON = 200ms typ), ON pulse width, KILL hold-off duration (1s after release), RST assertion delay (230ms typ), and IRQ pulse width (50ms typ). A 0.01µF capacitor yields nominal timing values; scaling is linear with capacitance, enabling design flexibility for different mechanical button response profiles or safety timing requirements.
LTC3375IUK#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)
LTC3375IUK#TRPBF FAQ
1.How can I place an order for LTC3375IUK#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3375IUK#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 LTC3375IUK#TRPBF reliable?
The price and inventory of LTC3375IUK#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3375IUK#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3375IUK#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3375IUK#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3375IUK#TRPBF?
LTC3375IUK#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3375IUK#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 LTC3375IUK#TRPBF?
For technical support, including LTC3375IUK#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3375IUK#TRPBF requirements.
6.How does Aetrix verify that LTC3375IUK#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3375IUK#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 LTC3375IUK#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3375IUK#TRPBF?
All LTC3375IUK#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3375IUK#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 LTC3375IUK#TRPBF part is unused and in its original packaging.
Return procedure for LTC3375IUK#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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