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Analog Devices Inc. LTC3374HFE#PBF
- Part No.:
- LTC3374HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3374HFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
LTC3374HFE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency 8-channel synchronous buck DC/DC regulator IC supporting independent or paralleled operation per channel, with 1A per channel (up to 4A per output when combined), 2.25V–5.5V input range per VIN pin, 0.8V–VIN output range, and thermally robust –40°C to 150°C operation in a 38-lead TSSOP package. It serves multirail power management in automotive infotainment and industrial control systems requiring precise sequencing and thermal monitoring.
For engineers reviewing the LTC3374HFE#PBF datasheet, LTC3374HFE#PBF pinout, LTC3374HFE#PBF application, or LTC3374HFE#PBF equivalent, key selection considerations include per-channel enable threshold precision (±30mV hysteresis), die temperature sensing via TEMP pin (150mV @ 25°C, 6.75mV/°C slope), programmable 1MHz–3MHz oscillator, and master-slave configuration capability for current scaling without external controllers.
Technical Context
The LTC3374HFE#PBF integrates eight fully independent synchronous buck regulators, each with dedicated VIN, SW, FB, and EN pins, enabling flexible rail assignment and isolation. All channels share a common oscillator that can be resistor-programmed (RT pin), synchronized externally (SYNC), or set to internal 2MHz default - with automatic slope compensation adaptation during synchronization.
Operating mode (Burst Mode® vs forced continuous PWM) is globally controlled by the MODE pin, while power-good status across all enabled regulators is reported via open-drain PGOOD_ALL. Thermal protection includes overtemperature shutdown at 165°C with 10°C hysteresis and a linear analog TEMP output for real-time die temperature monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per VIN pin - supports mixed-supply systems with independent input rails |
| Output Voltage Range | 0.8V to VIN - enables low-voltage core supplies (e.g., 0.8V FPGA I/O) and adjustable bias rails |
| Per-Channel Output Current | Up to 1A continuous - scalable to 2A/3A/4A per output using master-slave parallel configurations |
| Oscillator Frequency | 1MHz to 3MHz (programmable via RT resistor or SYNC) - allows EMI optimization and inductor size reduction |
| Enable Threshold Accuracy | 400mV rising / 340mV falling (typical) with 60mV hysteresis - ensures reliable autonomous power-up sequencing |
| Die Temperature Sensing | 150mV @ 25°C, 6.75mV/°C slope - provides calibrated analog output for thermal margining and derating |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive and high-temp industrial environments |
Pinout & Package
Package: 38-lead plastic TSSOP (0.025" pitch), exposed pad (Pin 39) connected to GND for thermal and electrical performance. θJA = 25°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1–EN8 | Independent enable inputs | Active-high logic; each controls one buck channel - enables staggered startup and dynamic rail enable/disable |
| FB1–FB8 | Feedback voltage sense inputs | Connect to resistor divider on output; shorting FBx to VINx configures master-slave pairing for current sharing |
| VIN1–VIN8 | Independent input supply pins | Each powers one buck stage; may be tied together or driven from separate sources for rail isolation |
| SW1–SW8 | Switch node outputs | Connect to external inductors; phase-shifted 90° to reduce input ripple current and EMI |
| PGOOD_ALL | Global power-good indicator | Open-drain output pulled low if any enabled regulator's output drops >7.5% below target - simplifies system-level fault detection |
| TEMP | Digital die temperature monitor | Analog voltage output proportional to junction temperature - used for thermal throttling or health monitoring without ADC |
| MODE | Global operating mode select | Low = Burst Mode® (high light-load efficiency); High = forced continuous PWM (low noise, fixed frequency) |
| SYNC / RT | Oscillator control interface | SYNC accepts external clock (1–3MHz); RT sets frequency via resistor to GND or ties to VCC for 2MHz default |
Key Features
| Feature | Design Value |
|---|---|
| 8 independent 1A buck regulators | Enables full rail independence - no shared control logic or timing constraints between channels |
| Master-slave parallel capability | Up to four converters per group (e.g., BUCK1–BUCK4) share one inductor and deliver up to 4A with single feedback loop |
| 90° phase interleaving | Reduces RMS input capacitor current by ~30% and lowers conducted EMI compared to in-phase switching |
| Precision enable thresholds | ±30mV hysteresis and tight 400mV rising threshold allow deterministic, self-timed power sequencing without external supervisors |
| Integrated die temperature sensor | Eliminates need for external thermal diode or NTC; enables closed-loop thermal management in space-constrained designs |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering multiple voltage domains in head-unit SoCs (e.g., 1.2V CPU core, 1.8V GPU, 3.3V CAN transceivers, 5V USB). IC Role / Device Role / Timing Role: Multichannel buck regulator providing isolated, sequenced, and thermally monitored rails. Use Value: Eliminates discrete PMICs and sequencing ICs; reduces BOM count by 60% versus dual 4-channel solutions. | Use Scenario: Supplying field I/O circuits (24V-to-5V, 5V-to-3.3V, 3.3V-to-1.8V) and microcontroller peripherals in harsh factory environments. IC Role / Device Role / Timing Role: Primary power management IC delivering stable, high-temp-rated rails with built-in thermal guardbanding. Use Value: 150°C max junction rating and TEMP pin enable operation near hot motor drives without derating. |
| Communications Baseband Unit | Medical Imaging Sensor Array |
Use Scenario: Generating low-noise, tightly regulated supplies for RF front-end ICs, ADCs, and FPGAs in 5G small cells. IC Role / Device Role / Timing Role: High-efficiency, low-ripple multirail source with selectable Burst Mode®/PWM modes per system load profile. Use Value: Forced continuous mode minimizes switching noise near sensitive analog receivers; Burst Mode® extends standby battery life. | Use Scenario: Powering distributed CMOS image sensor bias rails (1.2V, 1.8V, 2.5V, 3.3V) in portable ultrasound probes. IC Role / Device Role / Timing Role: Compact, thermally aware power solution meeting medical-grade reliability and size constraints. Use Value: Exposed-pad TSSOP package achieves 25°C/W thermal resistance - critical for fanless handheld enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3372HFE#PBF | 4-channel version; identical pinout, package, and feature set but half the channel count | Suitable where only 4 rails are needed - saves cost and layout area without sacrificing thermal or sequencing capability | Select when system rail count ≤ 4 and footprint compatibility with LTC3374HFE#PBF is required for design reuse |
| TPS65270PWP | TI dual 3A/2A buck + LDO; no per-channel enable, no TEMP output, lower temp grade (–40°C to 125°C) | Targeted at cost-sensitive consumer electronics; lacks autonomous sequencing and thermal telemetry | Choose only if thermal monitoring and precise enable sequencing are not required, and higher per-rail current suffices over channel count |
Compared with LTC3372HFE#PBF, the LTC3374HFE#PBF doubles channel count without increasing package size or thermal resistance; versus TPS65270PWP, it offers superior sequencing autonomy, integrated die temperature sensing, and extended 150°C operation - critical for automotive and industrial deployments.
Availability
LTC3374HFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and communications baseband units requiring stable component supply, extended temperature support, and long-term lifecycle assurance.
Supply support for LTC3374HFE#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3374HFE#PBF belongs to the LTC® multichannel buck regulator family, designed specifically for space-constrained, thermally demanding applications requiring independent rail control, precise sequencing, and real-time thermal telemetry - not general-purpose power conversion.
FAQ
What is the maximum junction temperature rating for the LTC3374HFE#PBF?
The LTC3374HFE#PBF is rated for operation up to 150°C junction temperature, with overtemperature shutdown triggered at 165°C and 10°C hysteresis. This H-grade qualification makes the LTC3374HFE#PBF suitable for under-hood automotive and high-ambient industrial environments where standard I-grade parts (125°C) would require derating or heatsinking.
How does the LTC3374HFE#PBF support power sequencing across multiple rails?
The LTC3374HFE#PBF supports autonomous sequencing via precision enable thresholds: EN pins activate at 400mV (rising) with 60mV hysteresis, allowing staggered turn-on by cascading ENx to PGOOD of prior rails or using RC delays. No external supervisor IC is needed - the LTC3374HFE#PBF implements deterministic, voltage-threshold-based sequencing natively.
Can the LTC3374HFE#PBF combine channels to deliver more than 1A per output?
Yes - the LTC3374HFE#PBF supports master-slave parallel operation: connecting FBx to VINx pairs adjacent channels (e.g., FB2 to VIN2 combines BUCK1 and BUCK2), enabling 2A, 3A, or 4A per output with shared inductor and single feedback network. Up to four channels may be grouped, maintaining regulation accuracy and current sharing within ±10% mismatch.
What is the function of the TEMP pin on the LTC3374HFE#PBF?
TEMP is an analog output pin providing a voltage proportional to die temperature: 150mV at 25°C with a slope of 6.75mV/°C. It requires no calibration and interfaces directly to an ADC or comparator, enabling real-time thermal monitoring, dynamic frequency scaling, or overtemperature warning - eliminating need for external thermal sensors in the LTC3374HFE#PBF design.
Does the LTC3374HFE#PBF support external clock synchronization?
Yes - the SYNC pin accepts an external TTL/CMOS clock signal from 1MHz to 3MHz. When driven, the LTC3374HFE#PBF synchronizes all eight buck regulators to that frequency and automatically adjusts internal slope compensation to maintain stability. This feature reduces beat frequencies and EMI in systems with multiple switching regulators, and eliminates need for spread-spectrum or complex filtering.
LTC3374HFE#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
LTC3374HFE#PBF FAQ
1.How can I place an order for LTC3374HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374HFE#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 LTC3374HFE#PBF reliable?
The price and inventory of LTC3374HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3374HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374HFE#PBF?
LTC3374HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374HFE#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 LTC3374HFE#PBF?
For technical support, including LTC3374HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374HFE#PBF requirements.
6.How does Aetrix verify that LTC3374HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3374HFE#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 LTC3374HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3374HFE#PBF?
All LTC3374HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374HFE#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 LTC3374HFE#PBF part is unused and in its original packaging.
Return procedure for LTC3374HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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