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Analog Devices Inc. LTC3374AHFE
- Part No.:
- LTC3374AHFE
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3374AHFE.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,701
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Product details
Overview
LTC3374AHFE from Analog Devices is a configurable 8-channel, 2.25 V to 5.5 V input PMIC integrating eight 1 A synchronous buck regulators with pin-selectable output current configurations (up to 8 A total), ±1% output voltage accuracy, and 1 MHz–3 MHz programmable switching frequency. It serves as a multirail power supply controller for FPGA, ASIC, and microprocessor core/logic/IO rail sequencing in space-constrained industrial and automotive infotainment systems.
For engineers reviewing the LTC3374AHFE datasheet, LTC3374AHFE pinout, LTC3374AHFE application, or LTC3374AHFE equivalent, key selection criteria include its 38-lead QFN package thermal performance, CFG0–CFG3 pin-strappable current allocation across eight channels, integrated current monitoring (IMONx), and support for parallel channel operation with shared inductors - all critical for BOM flexibility and feature-creep mitigation during design iteration.
Technical Context
The LTC3374AHFE implements eight independent synchronous buck regulators, each with internal high-side and low-side MOSFETs rated for 1 A continuous output. Its CFG0–CFG3 pins configure one of 15 fixed current allocations (e.g., 4 × 2 A, 2 × 3 A + 2 × 1 A) without external programming interface.
It operates from a single 2.25 V–5.5 V input, supports output voltages from 0.8 V to VIN, and features per-channel RUNx enable inputs, PGOODx status outputs, differential FB sensing, and internal compensation - eliminating need for external compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25 V to 5.5 V - supports direct connection to Li-ion battery, 3.3 V/5 V rails, or post-regulated supplies without external LDO pre-regulation. |
| Total Output Current | Up to 8 A - achieved via configurable allocation across eight 1 A stages; enables scalable rail generation without overdesigning individual converters. |
| Output Voltage Accuracy | ±1% - ensures tight regulation for sensitive digital core/IO supplies, reducing need for margining in system-level voltage tolerance budgets. |
| Switching Frequency | 1 MHz to 3 MHz - allows use of small, low-profile inductors (e.g., 0.47 µH–2.2 µH) and minimizes EMI in noise-sensitive applications. |
| Quiescent Current | 28 µA (1 channel active) - extends battery life in always-on subsystems such as automotive body controllers or sensor hubs. |
| Thermal Shutdown Threshold | 165°C (typical) - protects device and PCB under sustained overload or poor airflow, with automatic recovery at 155°C. |
| Operating Junction Temp | –40°C to +125°C - qualified for under-hood automotive and industrial environments without derating. |
Pinout & Package
The LTC3374AHFE is housed in a thermally enhanced 38-lead QFN package (5 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignment supports independent channel control, current monitoring, and configuration without external logic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 2.25 V–5.5 V; powers all internal regulators and logic; requires local 10 µF ceramic bypass. |
| CFG0–CFG3 | Configuration select inputs | Binary-coded pins defining one of 15 current allocations (e.g., 0000 = 4 × 2 A); pulled high/low via resistors to set topology at power-up. |
| RUN1–RUN8 | Channel enable inputs | Individual CMOS-compatible enables with precise thresholds (0.95 V/1.15 V); allow flexible power-up sequencing and dynamic rail shutdown. |
| PGOOD1–PGOOD8 | Power-good status outputs | Open-drain outputs indicating ±5% regulation window; used for cascaded enable or system fault detection. |
| IMON1–IMON8 | Current monitor outputs | Analog current sources (1 µA/mA) proportional to average channel load; enable real-time load telemetry without sense resistors. |
| FB1–FB8 | Feedback inputs | High-impedance inputs for resistor-divider setting of output voltage (0.8 V reference); support remote sensing via differential pair. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-strappable current configuration | 15 fixed output current combinations (e.g., 2 × 3 A + 2 × 1 A) selected by CFG0–CFG3; eliminates firmware dependency and enables hardware-only reconfiguration. |
| Integrated current monitoring | Eight IMONx pins deliver 1 µA/mA analog current proportional to load - replaces discrete sense resistors and amplifiers, saving board area and BOM cost. |
| Parallelable buck stages | Any two adjacent channels can be paralleled using shared inductor and synchronized switching - reduces component count and improves current sharing accuracy vs. discrete solutions. |
| Thermally robust QFN package | 38-lead 5 mm × 7 mm QFN with exposed thermal pad; achieves < 40°C/W θJA on 2-layer board with 2-in² copper pour - sustains full 8 A output in compact layouts. |
| Low-noise Burst Mode® operation | Enables 28 µA quiescent current with regulated output; maintains tight voltage regulation at light loads without external LDO post-regulation. |
Applications
| Automotive Infotainment Head Unit | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering display controller, audio codec, CAN transceiver, and touch processor from a 3.3 V or 5 V supply bus in a temperature-stressed dashboard environment. IC Role / Device Role / Timing Role: Multirail PMIC generating 1.2 V (core), 1.8 V (memory), 3.3 V (peripherals), and 5 V (USB PHY) with independent sequencing and fault reporting. Use Value: Single-chip solution replaces four discrete buck ICs and eight external current-sense circuits, reducing PCB area by >35% and enabling full thermal monitoring via IMONx and TEMP pin. |
Use Scenario: Supplying isolated field I/O drivers, ARM Cortex-M7 MCU, Ethernet PHY, and SD card interface in a DIN-rail mounted controller operating continuously at 70°C ambient. IC Role / Device Role / Timing Role: Configurable rail generator with RUNx-controlled staggered startup to limit inrush, PGOODx feedback to FPGA configuration manager, and die temperature readback for predictive thermal throttling. Use Value: CFG pin selection allows identical hardware to support multiple I/O variants (e.g., 4-channel vs. 8-channel modules) without layout change - accelerating variant development. |
| FPGA-Based Test Equipment | Medical Imaging Sensor Hub |
Use Scenario: Delivering tightly regulated, low-noise supplies to Xilinx Artix-7 FPGA banks (VCCINT, VCCAUX, VCCO) and ADC front-end circuitry in portable benchtop analyzers. IC Role / Device Role / Timing Role: Precision multirail source with ±1% output accuracy, differential FB sensing, and 1 MHz–3 MHz sync capability to avoid beat frequencies with sampling clocks. Use Value: Programmable frequency and Burst Mode® operation suppress conducted EMI below CISPR-22 Class B limits while maintaining < 10 mVpp ripple on 1.0 V core rail. |
Use Scenario: Powering CMOS image sensor array, low-noise analog front-end (AFE), microcontroller, and Bluetooth LE radio in handheld ultrasound probe requiring battery longevity and silent operation. IC Role / Device Role / Timing Role: Ultra-low IQ PMIC providing sequenced 1.2 V (sensor), 1.8 V (AFE), 3.3 V (MCU), and 3.0 V (radio) rails with autonomous thermal shutdown at 165°C. Use Value: 28 µA quiescent current in single-rail mode extends lithium-polymer battery runtime beyond 48 hours in standby, while IMONx enables real-time power budgeting in host firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3374IFE | Same pinout and electrical specs, but rated for –40°C to +105°C (vs. +125°C for LTC3374AHFE); no integrated EXTVCC option. | Suitable for commercial/industrial applications without extended temperature requirements; lacks automotive-grade thermal margin. | Select LTC3374IFE only when ambient temperature remains ≤105°C and EXTVCC efficiency boost is unnecessary. |
| LTC3375EFE | 48-lead QFN, 7 mm × 7 mm; supports higher input voltage (2.25 V–5.5 V same), but adds I²C interface and removes CFG pin strapping; total current limited to 8 A across eight 1 A stages. | Preferred where firmware-based dynamic reconfiguration is required; incompatible with hardware-only CFG-driven designs. | Choose LTC3375EFE only if system includes microcontroller with I²C and requires runtime current reallocation - not for pin-strapped simplicity. |
Compared with LTC3374IFE and LTC3375EFE, the LTC3374AHFE uniquely combines automotive-grade temperature range (–40°C to +125°C), hardware-configurable current allocation via CFG pins, and absence of I²C overhead - making it optimal for safety-critical, firmware-light, or cost-sensitive embedded systems requiring guaranteed thermal resilience and layout stability.
Availability
LTC3374AHFE is available at Aetrix Electronics and suitable for automotive infotainment head units, industrial PLC I/O modules, and FPGA-based test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3374AHFE 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement, power management, and connectivity.
The LTC3374AHFE belongs to ADI's Power by Linear configurable PMIC family, designed specifically to replace discrete multi-rail buck solutions in space- and thermal-constrained applications where feature creep, rapid prototyping, and automotive qualification are critical.
FAQ
What is the maximum total output current supported by the LTC3374AHFE?
The LTC3374AHFE supports up to 8 A total output current, distributed across its eight 1 A synchronous buck regulators. This total is achieved through pin-strappable CFG0–CFG3 settings that define fixed current allocations - such as 4 × 2 A, 2 × 3 A + 2 × 1 A, or 8 × 1 A - with no software or I²C interface required. The LTC3374AHFE delivers this current within its specified –40°C to +125°C junction temperature range while maintaining ±1% output voltage accuracy.
Does the LTC3374AHFE require external compensation components for its buck regulators?
No, the LTC3374AHFE uses internally compensated buck regulators, eliminating the need for external Type II or Type III compensation networks. Each channel only requires a resistor divider on its FBx pin to set output voltage, plus standard input/output capacitors and inductors. This simplifies layout, reduces BOM count, and ensures stable operation across all 15 CFG-defined configurations without tuning. The LTC3374AHFE maintains phase margin and transient response specifications across its full operating range without user compensation.
How does the LTC3374AHFE support power sequencing in complex systems?
The LTC3374AHFE supports precise power sequencing via eight independent RUNx enable inputs with accurate 0.95 V turn-on and 1.15 V turn-off thresholds, allowing staggered activation of rails using simple RC delays or FPGA-controlled GPIOs. Each channel also provides a dedicated open-drain PGOODx output signaling ±5% regulation status, enabling cascaded enable logic or system-level fault detection. This architecture lets designers implement custom sequencing for FPGA, ASIC, or microprocessor power domains without external supervisors - a key capability of the LTC3374AHFE in multirail systems.
Can multiple LTC3374AHFE channels be paralleled to increase current per rail?
Yes, adjacent channels (e.g., CH1+CH2, CH3+CH4) on the LTC3374AHFE can be paralleled using a single shared inductor and synchronized switching to double current capacity per rail - for example, combining two 1 A stages into a 2 A output. This is enabled by tying their SWx pins together and using common feedback and RUN signals. The LTC3374AHFE's matched internal MOSFETs and integrated current balancing ensure stable operation without external current-sharing circuitry - a verified capability documented in Analog Devices' application schematics for the LTC3374AHFE.
What thermal protection features does the LTC3374AHFE include?
The LTC3374AHFE integrates dual thermal protection: (1) an overtemperature shutdown function that disables all enabled buck regulators when die temperature reaches 165°C (typical), with automatic restart at 155°C; and (2) a die temperature monitor output (TEMP pin) delivering an analog voltage (10 mV/°C) for external ADC reading. These features enable both autonomous fault containment and proactive thermal management in the LTC3374AHFE - critical for automotive and industrial deployments where sustained high ambient temperatures are expected.
LTC3374AHFE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 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):
- 0.8V
- 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:
- 38-TSSOP-EP
LTC3374AHFE FAQ
1.How can I place an order for LTC3374AHFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374AHFE 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 LTC3374AHFE reliable?
The price and inventory of LTC3374AHFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374AHFE is usually 5 days.
3.What payment methods are accepted for LTC3374AHFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374AHFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374AHFE?
LTC3374AHFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374AHFE 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 LTC3374AHFE?
For technical support, including LTC3374AHFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374AHFE requirements.
6.How does Aetrix verify that LTC3374AHFE is sourced from the original manufacturer or authorized distributors?
All LTC3374AHFE 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 LTC3374AHFE meets industry standards.
7.What is the process for return or replacement of LTC3374AHFE?
All LTC3374AHFE units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374AHFE, 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 LTC3374AHFE part is unused and in its original packaging.
Return procedure for LTC3374AHFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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