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Analog Devices Inc. LTC3374AHFE#PBF
- Part No.:
- LTC3374AHFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3374AHFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,210
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Product details
Overview
LTC3374AHFE#PBF from Analog Devices is an 8-channel synchronous buck DC/DC power supply IC with independent 2.25V–5.5V input supplies per channel, ±1% VFB accuracy for Buck 1, 1MHz–3MHz programmable switching frequency, and AEC-Q100 qualification for automotive use in multirail power systems.
For engineers reviewing the LTC3374AHFE#PBF datasheet, LTC3374AHFE#PBF pinout, LTC3374AHFE#PBF application, or LTC3374AHFE#PBF equivalent, this page delivers verified package mapping (38-lead TSSOP), master/slave configuration support up to 4A, die temperature monitoring, overvoltage indication, and precise enable thresholds for autonomous sequencing.
Technical Context
The LTC3374AHFE#PBF integrates eight independent 1A synchronous buck regulators sharing a common oscillator and MODE-controlled operating mode (Burst or forced continuous). Each channel supports independent VIN, FB, SW, and EN pins, enabling flexible rail assignment and phase-shifted operation (90° interleaving) to reduce input ripple.
It features a programmable RT resistor interface for oscillator tuning, SYNC pin for external clock synchronization, PGOOD_ALL open-drain status output, and TEMP pin delivering 220mV at 25°C with 7mV/°C slope for die temperature monitoring - all within a thermally enhanced 38-lead exposed-pad TSSOP package rated for –40°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per buck channel - supports diverse rail inputs including 3.3V, 5V, and low-voltage battery sources. |
| Output Current Capability | Up to 1A per channel; up to 4A via master/slave parallel configuration using shared inductor - enables scalable current delivery without redesigning magnetics. |
| Feedback Accuracy | ±1% for Buck 1 (VFB = 800mV typ); ±1.6% for Bucks 2–8 - ensures tight regulation critical for FPGA, ASIC, and processor core rails. |
| Oscillator Frequency | 1MHz to 3MHz programmable via RT resistor; default 2MHz internal clock - allows EMI optimization and inductor size reduction. |
| Overvoltage Detection | 107.5% ±1.5% of regulated VOUT with 3% hysteresis - provides fast fault response to prevent downstream component damage. |
| Operating Temperature | –40°C to +150°C junction - qualified for under-hood automotive applications and high-ambient industrial environments. |
| Package Type | 38-lead plastic TSSOP with exposed pad - offers proven manufacturability and thermal performance (θJA = 25°C/W). |
Pinout & Package
Package: 38-lead plastic TSSOP with exposed GND pad (Pin 39), rated for –40°C to +150°C operation and θJA = 25°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1–EN8 | Active-high enable inputs | Independent control of each buck regulator; precision thresholds (e.g., EN1 rising = 400mV typ) enable robust power-up sequencing without external supervisors. |
| FB1–FB8 | Feedback inputs | Resistor-divider nodes for output voltage setting; FB2–FB8 tied to respective VIN pins enable master/slave current combining (up to 4A). |
| VIN1–VIN8 | Independent input supplies | Each accepts 2.25V–5.5V; shorting adjacent VINs (e.g., VIN2 to VIN1) configures parallel operation while maintaining per-rail input isolation. |
| SW1–SW8 | Switch node outputs | Connect to external inductors; phase-shifted 90° switching minimizes input capacitor RMS current and reduces conducted EMI. |
| PGOOD_ALL | Open-drain system status | Asserts low if any enabled buck's output falls below 97% or exceeds 109% of target - simplifies system-level fault detection with single-wire monitoring. |
| TEMP | Digital die temperature monitor | Outputs 220mV at 25°C with 7mV/°C slope; enables real-time thermal margining and overtemperature warning before OT shutdown at 170°C. |
| MODE | Global operating mode select | Low = Burst Mode for light-load efficiency; high = forced continuous mode for low-noise, constant-frequency operation - no per-channel mode control required. |
| RT / SYNC | Oscillator programming interface | RT sets frequency via resistor (1–3MHz); SYNC accepts external clock (1–3MHz) with automatic slope compensation - supports synchronized multi-IC designs. |
Key Features
| Feature | Design Value |
|---|---|
| Eight independent 1A buck regulators | Enables compact, discrete multirail power architecture without external controllers or complex PMIC firmware. |
| Master/slave configurable up to 4A | Reduces BOM count and PCB area by allowing up to four channels to share one inductor and output capacitor set. |
| ±1% VFB accuracy on Buck 1 | Meets stringent core voltage tolerance requirements for high-performance processors and FPGAs operating at sub-1V levels. |
| AEC-Q100 qualified (Grade H) | Validated for automotive powertrain and ADAS modules requiring long-term reliability at 150°C junction temperature. |
| Die temperature monitor with analog output | Eliminates need for external thermal sensors; enables predictive thermal throttling and lifetime derating calculations. |
| Overvoltage indicator with hysteresis | Provides early warning of feedback network faults or transient overvoltage events before catastrophic failure occurs. |
Applications
| Automotive ADAS Domain Controller | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering multiple voltage domains (e.g., 1.2V CPU core, 1.8V memory, 3.3V interface, 5V sensor bias) in a centralized ADAS domain controller. IC Role / Device Role / Timing Role: Primary multichannel power management IC delivering independent, sequenced, and monitored rails from 12V or 5V intermediate bus. Use Value: AEC-Q100 Grade H rating and 150°C operation ensure functional safety compliance; PGOOD_ALL and TEMP simplify ISO 26262 diagnostic coverage. | Use Scenario: Generating isolated 3.3V, 5V, and ±12V rails for digital logic, analog signal conditioning, and fieldbus transceivers in modular PLC backplanes. IC Role / Device Role / Timing Role: Centralized DC/DC hub managing up to eight I/O module supply rails with independent enable/disable and fault reporting. Use Value: Independent VIN inputs allow direct connection to different backplane voltages; master/slave grouping supports high-current analog supplies without extra converters. |
| Communications Baseband Unit | Medical Imaging Signal Chain |
Use Scenario: Supplying noise-sensitive RF front-end, baseband processor, memory, and auxiliary peripherals in 5G small cell baseband units. IC Role / Device Role / Timing Role: Low-noise, phase-interleaved buck regulator array minimizing input ripple and EMI coupling into sensitive RF sections. Use Value: 90° phase shift across eight channels cuts input capacitor RMS current by >70% versus single-phase design; Burst Mode extends standby battery life. | Use Scenario: Powering high-resolution ADCs, DACs, FPGA-based reconstruction engines, and low-noise amplifiers in portable ultrasound and MRI subsystems. IC Role / Device Role / Timing Role: Precision-regulated, low-drift multirail source with tight VFB accuracy and thermal monitoring for calibration-critical analog paths. Use Value: ±1% VFB on Buck 1 ensures stable reference for 16-bit+ data converters; TEMP output enables real-time gain/offset correction based on die temperature drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3374AEFE#PBF | Same functionality and pinout; rated for –40°C to +125°C junction temperature (Grade E) | Suitable for commercial/industrial applications without extended thermal requirements | Select when ambient conditions remain below 125°C and AEC-Q100 is not required. |
| TPS65270RGET | Triple-output buck (2×2A + 1×3A); no phase interleaving, no die temperature monitor, no OV indicator | Lower channel count; lacks automotive qualification and advanced monitoring features | Choose for cost-sensitive, lower-complexity three-rail systems where thermal and fault visibility are secondary. |
Compared with LTC3374AEFE#PBF, the LTC3374AHFE#PBF adds 25°C higher max junction temperature and AEC-Q100 qualification - essential for under-hood automotive use. Versus TPS65270RGET, it offers double the channel count, integrated thermal sensing, and superior fault diagnostics, at the cost of higher pin count and layout complexity.
Availability
LTC3374AHFE#PBF is available at Aetrix Electronics and suitable for automotive ADAS, industrial PLC, and medical imaging applications requiring stable component supply, long lifecycle support, and AEC-Q100-compliant multirail power delivery.
Supply support for LTC3374AHFE#PBF 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 LTC3374A product line delivers highly integrated, thermally robust multichannel DC/DC solutions designed specifically for space-constrained, high-reliability automotive and industrial systems requiring independent rail control and comprehensive fault monitoring.
FAQ
What is the maximum output current achievable with LTC3374AHFE#PBF?
The LTC3374AHFE#PBF supports up to 1A per individual buck channel. By configuring master/slave combinations - such as pairing Buck 1 with Buck 2, Buck 3 with Buck 4, etc. - it achieves up to 4A per combined output using a single inductor. The datasheet confirms 4A capability with L = 1.0µH and DCR = 8mΩ, validated across temperature and input voltage ranges.
Does LTC3374AHFE#PBF support synchronization to an external clock?
Yes, the LTC3374AHFE#PBF supports external clock synchronization via its SYNC pin. When driven with a clean 1MHz–3MHz square wave (tLOW/tHIGH > 40ns), all eight buck regulators lock to the applied frequency, and internal slope compensation automatically adapts - ensuring stable operation in noise-sensitive or multi-IC synchronized systems.
How does the TEMP pin on LTC3374AHFE#PBF function in practice?
The TEMP pin on LTC3374AHFE#PBF outputs an analog voltage of 220mV at 25°C with a nominal slope of 7mV/°C, directly tracking die temperature. This allows real-time thermal monitoring without external sensors; tying TEMP to VCC disables the monitor and saves ~12µA of VCC quiescent current when thermal visibility is not needed.
What is the purpose of the PGOOD_ALL pin on LTC3374AHFE#PBF?
The PGOOD_ALL pin on LTC3374AHFE#PBF is an open-drain output that asserts LOW whenever the regulated output voltage of any enabled buck falls below 97% (Buck 1) or 94% (Bucks 2–8) of target, or rises above 109% (OV threshold). It remains LOW when all bucks are disabled - enabling simple system-level power-good validation with a single pull-up resistor.
Can LTC3374AHFE#PBF be used in forced continuous mode?
Yes, LTC3374AHFE#PBF operates in forced continuous mode when the MODE pin is held high. This eliminates low-load frequency variation and output voltage ripple associated with Burst Mode, making it ideal for noise-sensitive applications like high-speed ADCs or RF circuitry where consistent switching behavior is mandatory.
LTC3374AHFE#PBF 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:
- 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):
- 0.8V
- 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#PBF FAQ
1.How can I place an order for LTC3374AHFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374AHFE#PBF 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#PBF reliable?
The price and inventory of LTC3374AHFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374AHFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3374AHFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374AHFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374AHFE#PBF?
LTC3374AHFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374AHFE#PBF 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#PBF?
For technical support, including LTC3374AHFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374AHFE#PBF requirements.
6.How does Aetrix verify that LTC3374AHFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3374AHFE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3374AHFE#PBF?
All LTC3374AHFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374AHFE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3374AHFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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