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Analog Devices Inc. LTC3374HFE
- Part No.:
- LTC3374HFE
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3374HFE.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,920
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Product details
Overview
LTC3374HFE from Analog Devices is a configurable 8-channel, 20 V input PMIC with eight 1.5 A power stages supporting up to eight independent buck outputs or flexible parallel configurations (e.g., 4×3 A, 2×6 A). It delivers ±1% output voltage accuracy down to 0.4 V, operates from –40°C to +125°C, and targets automotive infotainment, industrial control, and telecom systems requiring multirail, high-current, low-noise power delivery.
For engineers reviewing the LTC3374HFE datasheet, LTC3374HFE pinout, LTC3374HFE application, or LTC3374HFE equivalent, key selection criteria include its 20 V max input rating, 15 configurable current combinations, integrated thermal monitoring via TEMP pin, programmable 1–3 MHz switching frequency, and support for external synchronization - all critical for space-constrained, thermally demanding multichannel designs.
Technical Context
The LTC3374HFE integrates eight synchronous buck power stages with pin-strappable CFG0–CFG3 inputs to select among 15 total output current configurations (e.g., 8×1.5 A, 4×3 A, 2×6 A, or 1×12 A), enabling dynamic adaptation to changing rail requirements without PCB redesign. Each channel supports independent feedback, differential sensing, and soft-start.
It features internal compensation, Burst Mode® operation for ultralow quiescent current (63 µA with one channel enabled), forced continuous PWM mode for low-noise operation, and comprehensive protection including overtemperature shutdown at 165°C (typ), short-circuit protection, and input current limiting. The EXTVCC pin improves efficiency by powering internal circuitry from an auxiliary supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 20 V - supports 12 V/18 V wall adapters and automotive battery rails without pre-regulation. |
| Total Output Current | Up to 12 A - achieved via configurable parallelization of eight 1.5 A stages (e.g., 4×3 A). |
| Output Voltage Range | 0.4 V to 0.83 × VIN - enables direct core supply for modern FPGAs, ASICs, and microprocessors. |
| Switching Frequency | 1 MHz to 3 MHz (programmable) - allows optimization of size vs. EMI; default 2 MHz reduces inductor size. |
| Quiescent Current | 63 µA (1 channel enabled) - extends battery life in always-on subsystems like automotive telematics. |
| Thermal Shutdown Threshold | 165°C (typical) - protects die and PCB during overload or poor airflow conditions. |
| Operating Junction Temp | –40°C to +125°C - qualified for under-hood automotive and industrial environments. |
Pinout & Package
The LTC3374HFE is housed in a 38-lead QFN package (5 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are defined by CFG0–CFG3 strapping, RUNx enable inputs, FBx feedback nodes, PGOODx status outputs, IMONx current monitors, and dedicated BSTx, SWx, and VINA–VING supply inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–VING | Input supply rails | Seven independent 3–20 V inputs feeding respective power stages; enables mixed-rail input architectures. |
| SWA–SWH | Switch node outputs | Eight high-side switch outputs driving external inductors; each paired with internal low-side MOSFET. |
| BSTA–BSTH | Bootstrap capacitor connections | Internal bootstrap diodes eliminate need for external BST diodes; simplifies layout and reduces BOM count. |
| FB1–FB8 | Feedback inputs | Resistor-divider inputs for precise output voltage setting; support differential sensing for improved load regulation. |
| PGOOD1–PGOOD8 | Power-good status outputs | Open-drain outputs indicating ±5% regulation window; used for sequencing and system fault detection. |
| IMON1–IMON8 | Current monitor outputs | Analog current sources proportional to average channel load (1 µA/mA); enable real-time load telemetry. |
| CFG0–CFG3 | Configuration select inputs | Four-pin binary code selects one of 15 output current configurations; no software or I²C required. |
| TEMP | Die temperature monitor | Analog voltage output (10 mV/°C) for direct die temperature readback; supports closed-loop thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-configurable output current | Selects among 15 fixed current combinations (e.g., 8×1.5 A, 4×3 A, 2×6 A) using only four CFG pins - eliminates firmware dependency and requalification risk. |
| Integrated thermal monitoring | Die temperature reported via linear analog TEMP pin (10 mV/°C), enabling host MCU to implement dynamic throttling before OT shutdown occurs. |
| No external BST diodes required | Internal bootstrap diodes reduce component count, PCB area, and potential failure points in high-reliability applications. |
| Independent input supplies per channel | Seven VIN pins allow partitioned power domains (e.g., isolated 5 V and 12 V inputs), improving noise isolation and fault containment. |
| Programmable switching frequency | 1–3 MHz range set by RT resistor or external clock sync - balances EMI, efficiency, and passive size across diverse system constraints. |
Applications
| Automotive Instrument Cluster | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering multiple microcontrollers, CAN transceivers, display drivers, and sensor interfaces within a compact dashboard assembly operating at 125°C ambient. IC Role / Device Role / Timing Role: Primary multirail PMIC delivering 3.3 V/3 A, 2.5 V/3 A, 1.8 V/3 A, and 1.2 V/3 A from 12 V battery input with tight sequencing and thermal margin. Use Value: Configurable 4×3 A mode avoids discrete regulator proliferation; TEMP pin enables predictive thermal derating before system-level shutdown. |
Use Scenario: Supplying isolated analog front-end, FPGA configuration, Ethernet PHY, and real-time MCU in a DIN-rail mounted controller with strict EMC and thermal limits. IC Role / Device Role / Timing Role: Centralized power manager generating eight regulated rails (including 5 V, 3.3 V, 2.5 V, 1.8 V, and 1.2 V) with independent enable control and fault reporting. Use Value: Eight independent IMON outputs provide per-rail load telemetry for predictive maintenance; CFG strapping allows field-upgradable rail current allocation. |
| 5G Small Cell Baseband Unit | Medical Imaging Sensor Array |
Use Scenario: Powering high-speed ADCs, DACs, RF SoCs, and memory interfaces in a thermally constrained outdoor small cell enclosure. IC Role / Device Role / Timing Role: High-efficiency, low-noise quad-buck source delivering 1.0 V/6 A, 1.8 V/3 A, 3.3 V/2 A, and 5.0 V/1 A with synchronized switching to minimize beat frequencies. Use Value: Synchronization capability (SYNC/MODE pin) suppresses inter-rail interference critical for SNR-sensitive RF signal chains. |
Use Scenario: Providing precision, low-noise bias voltages to CMOS image sensors, analog front-ends, and timing controllers in portable ultrasound or X-ray detectors. IC Role / Device Role / Timing Role: Low-ripple, ±1% accurate multirail generator with Burst Mode® operation to minimize standby power during idle acquisition cycles. Use Value: 63 µA quiescent current extends battery runtime between imaging sessions; differential FB sensing ensures <1% load regulation across variable sensor loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3374A | Same 8-channel architecture and 15 configurations, but rated for 2.25 V–5.5 V input (not 20 V); lower max input voltage limits use in 12 V/24 V systems. | Suitable for low-voltage battery-powered devices (e.g., handheld medical, wearables), not automotive or industrial 12–20 V rails. | Select LTC3374A only when input stays below 5.5 V; LTC3374HFE is mandatory for 12 V+ applications. |
| LTC3375 | 8-channel PMIC with I²C interface and 48-lead QFN (7 mm × 7 mm); supports 2.25 V–5.5 V input and adds digital configuration, but lacks 20 V rating and CFG-pin simplicity. | Preferred where dynamic rail reconfiguration or telemetry logging is required; incompatible with pin-strapped legacy designs. | Choose LTC3375 for software-controlled flexibility; LTC3374HFE for hardware-defined, zero-firmware, high-input-voltage robustness. |
Compared with LTC3374A and LTC3375, the LTC3374HFE uniquely combines 20 V input capability, pin-based configurability, and automotive-grade thermal performance - making it the only option for high-voltage, safety-critical, firmware-free multirail power in space-constrained environments.
Availability
LTC3374HFE is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, 5G small cells, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3374HFE 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 since 1965.
The LTC3374HFE belongs to ADI's Power by Linear configurable PMIC family, designed specifically for systems needing scalable, multirail, high-current power delivery without firmware dependency or board-level redesign.
FAQ
What is the maximum input voltage supported by the LTC3374HFE?
The LTC3374HFE supports an absolute maximum input voltage of 20 V across its VIN pins (VINA–VING). This allows direct connection to 12 V and 18 V automotive and industrial power rails without external pre-regulation, distinguishing it from lower-voltage alternatives like the LTC3374A (5.5 V max).
How many output current configurations does the LTC3374HFE support, and how are they selected?
The LTC3374HFE supports exactly 15 distinct output current configurations - ranging from 8×1.5 A to 1×12 A - selected exclusively via hardware strapping of the CFG0–CFG3 pins. No I²C interface or firmware is required, ensuring deterministic behavior and eliminating qualification risks associated with software updates.
Does the LTC3374HFE include thermal monitoring, and how is it implemented?
Yes, the LTC3374HFE provides die temperature monitoring via the TEMP pin, which outputs an analog voltage of 10 mV per degree Celsius. This allows external MCUs to read real-time junction temperature for predictive thermal management, complementing the automatic 165°C overtemperature shutdown function.
What is the purpose of the IMON pins on the LTC3374HFE?
Each of the eight IMON pins on the LTC3374HFE sources a current proportional to its corresponding buck channel's average load current (1 µA per mA). These analog current outputs enable external monitoring of rail loading for diagnostics, power budgeting, or adaptive system control without adding sense resistors or amplifiers.
Can the LTC3374HFE synchronize its switching frequency to an external clock?
Yes, the LTC3374HFE supports external synchronization via the SYNC/MODE pin. When driven with a clean square wave (1–3 MHz), all internal buck regulators lock to the external clock, reducing beat frequencies and EMI in noise-sensitive applications such as RF baseband units and precision imaging systems.
LTC3374HFE 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
LTC3374HFE FAQ
1.How can I place an order for LTC3374HFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374HFE 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 LTC3374HFE reliable?
The price and inventory of LTC3374HFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374HFE is usually 5 days.
3.What payment methods are accepted for LTC3374HFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374HFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374HFE?
LTC3374HFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374HFE 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 LTC3374HFE?
For technical support, including LTC3374HFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374HFE requirements.
6.How does Aetrix verify that LTC3374HFE is sourced from the original manufacturer or authorized distributors?
All LTC3374HFE 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 LTC3374HFE meets industry standards.
7.What is the process for return or replacement of LTC3374HFE?
All LTC3374HFE units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374HFE, 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 LTC3374HFE part is unused and in its original packaging.
Return procedure for LTC3374HFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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