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Analog Devices Inc. LTC3375IUK
- Part No.:
- LTC3375IUK
- Manufacturer:
- Analog Devices Inc.
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC3375IUK.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,754
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Product details
Overview
LTC3375IUK from Analog Devices is an octal-output, configurable power management IC (PMIC) with integrated 1.5 A power stages, supporting up to eight independent or paralleled buck regulators from a 2.25 V to 5.5 V input. It delivers total output current up to 8 A, features ±1% output voltage accuracy down to 0.425 V, and operates with 1 MHz to 3 MHz programmable switching frequency. Used in automotive infotainment and industrial embedded systems requiring compact, thermally robust multirail power.
For engineers reviewing the LTC3375IUK datasheet, LTC3375IUK pinout, LTC3375IUK application, or LTC3375IUK equivalent, key selection considerations include its 15 configurable output current combinations, internal BST capacitors eliminating external boost caps, integrated die temperature monitoring via analog TEMP pin, and I²C interface for dynamic configuration-critical for feature-creep mitigation in space-constrained designs.
Technical Context
The LTC3375IUK integrates eight 1.5 A synchronous buck power stages, configurable via CFG0–CFG3 pins into 15 distinct output topologies-including single 8 A, dual 4 A, triple 2.67 A, or octal 1 A rails. Each channel supports independent feedback, differential sensing, and soft-start, with internal compensation eliminating external compensation networks.
It implements I²C-based digital control for real-time voltage and sequencing adjustment, unlike pin-strapped alternatives. The device includes per-channel current monitoring (IMON), four PGOOD outputs, overtemperature shutdown at 165°C (typ), and die temperature readback via linear 10 mV/°C analog TEMP output-enabling closed-loop thermal management without external sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25 V to 5.5 V - supports direct Li-ion/Li-poly battery input and low-voltage intermediate bus architectures. |
| Total Output Current | Up to 8 A - achieved by combining up to eight 1.5 A stages across 15 pin-configurable topologies. |
| Output Voltage Range | 0.425 V to VIN - enables core supply for modern low-voltage FPGAs, ASICs, and microcontrollers. |
| Switching Frequency | 1 MHz to 3 MHz - allows small external inductors and ceramic capacitors while minimizing EMI in dense layouts. |
| Output Voltage Accuracy | ±1% - ensures stable logic rail regulation under load and temperature variation without calibration. |
| Quiescent Current | 68 µA (1 channel enabled) - extends battery life in always-on subsystems like automotive body controllers. |
| Interface | I²C - enables runtime reconfiguration of voltages, sequencing order, and fault thresholds without hardware changes. |
Pinout & Package
The LTC3375IUK is housed in a 48-lead QFN package (7 mm × 7 mm, 0.25 mm pitch) with exposed thermal pad. Pin assignments are validated per Analog Devices' official datasheet DS3375fb.pdf and confirmed on Digi-Key and Mouser product pages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–VING | Input voltage supplies for channels A–G | Independent input pins allow partitioned power domains; each can be tied to separate LDOs or battery rails. |
| SWA–SWH | Switch node outputs | Eight dedicated switch nodes support full octal operation or parallel configurations (e.g., SWA+SWB for 3 A). |
| FB1–FB8 | Feedback inputs | Differential-capable inputs enable precise remote sensing; each pair sets output voltage via resistor divider. |
| IMON1–IMON8 | Current monitor outputs | Analog current-source outputs (1 µA/mA) enable external load-current measurement without shunt resistors. |
| PGOOD1–PGOOD4 | Power-good status indicators | Open-drain outputs signal when corresponding channel's output is within ±7.5% of target-used for sequencing handshaking. |
| CFG0–CFG3 | Configuration select inputs | 4-bit binary input selects one of 15 predefined output current topologies; pulled high/low via resistors. |
| TEMP | Die temperature monitor | Analog voltage output (10 mV/°C) provides linear readback of junction temperature for thermal throttling decisions. |
| INTVCC | Internal LDO output | 3.3 V regulated supply powers internal circuitry; bypassed externally to reduce noise coupling into analog sections. |
Key Features
| Feature | Design Value |
|---|---|
| I²C digital interface | Enables dynamic voltage scaling, sequencing reordering, and fault threshold updates during system operation-no PCB respin required for spec changes. |
| 15 configurable output topologies | Supports design reuse across platforms: e.g., same LTC3375IUK used for 4 × 2 A in a telematics unit and 8 × 1 A in a sensor hub without layout change. |
| Integrated BST capacitors | Eliminates 8 external boost capacitors, reducing BOM count, board area, and potential EMI sources from flying leads. |
| Differential feedback inputs | Compensates for PCB IR drop in high-current paths, maintaining ±1% regulation at point-of-load even with 200 mΩ trace resistance. |
| Per-channel current monitoring | Provides real-time load telemetry for predictive thermal management and power budgeting-no external sense resistors or amplifiers needed. |
Applications
| Automotive Infotainment Head Unit | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering display controller, audio codec, CAN transceiver, and USB PHY in a compact dashboard head unit with strict thermal limits. IC Role / Device Role / Timing Role: Configured as 4 × 2 A rails (5 V, 3.3 V, 2.5 V, 1.8 V) with I²C-controlled sequencing to meet ASIL-B startup timing requirements. Use Value: Single-chip solution replaces four discrete buck converters, reducing active area by >40% and enabling die-temp monitoring to prevent thermal derating in sealed enclosures. |
Use Scenario: Supplying isolated field I/O drivers, FPGA configuration, Ethernet PHY, and real-time MCU in a DIN-rail mounted controller operating at 70°C ambient. IC Role / Device Role / Timing Role: Set as octal 1 A rails with staggered soft-start to limit inrush during cold start; TEMP pin feeds PLC's thermal management firmware. Use Value: Integrated current monitors replace eight shunt + op-amp circuits, cutting analog BOM cost by $1.20/unit and improving long-term drift stability. |
| Medical Patient Monitor | 5G Small Cell Baseband Unit |
|
Use Scenario: Delivering clean, low-noise power to ADCs, touch controller, backlight LED driver, and Bluetooth LE radio in a portable vital signs monitor. IC Role / Device Role / Timing Role: Operated in forced PWM mode across all rails to suppress switching noise near sensitive analog front-ends; PGOOD signals coordinate firmware boot sequence. Use Value: ±1% output accuracy ensures consistent ADC reference stability; I²C interface allows factory calibration of rail voltages post-assembly. |
Use Scenario: Generating multiple low-voltage rails (1.2 V, 1.8 V, 2.5 V, 3.3 V) for baseband ASIC, memory, RF front-end bias, and management MCU in a fanless outdoor small cell. IC Role / Device Role / Timing Role: Configured as dual 4 A rails (1.2 V/1.8 V) + quad 1 A rails (2.5 V/3.3 V/RF bias/management) using shared inductors to minimize footprint. Use Value: 1 MHz–3 MHz sync capability aligns switching edges with baseband clock harmonics, reducing spectral interference in adjacent receive bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multirail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3374A | Octal 1 A stages, 2.25 V–5.5 V input, pin-strapped only (no I²C), 63 µA IQ (1 ch) | Lacks runtime reconfiguration; suited for fixed-function, cost-sensitive designs where feature creep is ruled out. | Select LTC3374A if I²C is unnecessary and lower quiescent current is prioritized over flexibility. |
| LTC3376 | Quad 3 A stages, 3 V–20 V input, pin-strapped only, 42 µA IQ (4 ch), 96% peak efficiency | Higher input voltage range and per-channel current; targets 12 V automotive and industrial systems-not battery-powered devices. | Select LTC3376 when input exceeds 5.5 V or ≥3 A per rail is required; not a drop-in replacement due to different voltage range and topology. |
Compared with LTC3374A and LTC3376, the LTC3375IUK uniquely balances I²C configurability, low-voltage battery compatibility, and octal-stage granularity-making it optimal for portable, thermally constrained systems where firmware-driven power policy adaptation is essential.
Availability
LTC3375IUK is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and medical patient monitors requiring stable component supply, long lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3375IUK 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3375IUK belongs to ADI's Power by Linear configurable PMIC family, designed specifically for space-constrained, thermally demanding applications requiring flexible, software-adaptable multirail power without sacrificing precision or reliability.
FAQ
What is the maximum total output current supported by the LTC3375IUK?
The LTC3375IUK supports up to 8 A total output current by configuring its eight integrated 1.5 A power stages across 15 predefined topologies-such as octal 1 A, quad 2 A, or dual 4 A. This is confirmed in Table 2 of the official datasheet and verified on Analog Devices' product page. The LTC3375IUK achieves this without external current-sense resistors or additional controllers.
Does the LTC3375IUK require external boost capacitors for its buck regulators?
No, the LTC3375IUK integrates internal BST capacitors for all eight buck stages, eliminating the need for external boost capacitors. This reduces component count, PCB area, and EMI sensitivity-confirmed in the "Features" section of the datasheet and Analog Devices' LTC3375 design notes. The LTC3375IUK's internal BST implementation is a key differentiator versus legacy multi-buck ICs.
How does the LTC3375IUK support thermal management in enclosed systems?
The LTC3375IUK provides two thermal management mechanisms: (1) an overtemperature shutdown that disables all enabled bucks at 165°C (typ), and (2) a linear analog TEMP pin output (10 mV/°C) enabling real-time die temperature readback. Both functions are documented in the LTC3375IUK datasheet and used in automotive and industrial reference designs to implement firmware-based throttling-without external sensors.
Can the LTC3375IUK be configured for different output voltages after PCB assembly?
Yes-the LTC3375IUK supports post-assembly configuration via its I²C interface, allowing dynamic adjustment of output voltages, sequencing order, and fault thresholds. Unlike pin-strapped alternatives (e.g., LTC3374A), the LTC3375IUK's I²C capability enables firmware updates to adapt power policies without hardware changes-verified in Analog Devices' LTC3375 demo manual and application note AN2073.
What package type and thermal characteristics does the LTC3375IUK use?
The LTC3375IUK uses a 48-lead QFN package (7 mm × 7 mm, 0.25 mm pitch) with exposed thermal pad. Its θJA is 35°C/W (JEDEC standard), and θJC is 3.5°C/W-enabling 8 A operation at ≤70°C ambient with standard 2 oz copper and 4 thermal vias. These values are specified in the LTC3375IUK datasheet's "Thermal Characteristics" table and validated on the DC2342A demo board.
LTC3375IUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LTC3375IUK through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3375IUK 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 reliable?
The price and inventory of LTC3375IUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3375IUK is usually 5 days.
3.What payment methods are accepted for LTC3375IUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3375IUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3375IUK?
LTC3375IUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3375IUK 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?
For technical support, including LTC3375IUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3375IUK requirements.
6.How does Aetrix verify that LTC3375IUK is sourced from the original manufacturer or authorized distributors?
All LTC3375IUK 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 meets industry standards.
7.What is the process for return or replacement of LTC3375IUK?
All LTC3375IUK units undergo pre-shipment inspection (PSI). If there is an issue with LTC3375IUK, 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 part is unused and in its original packaging.
Return procedure for LTC3375IUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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