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Analog Devices Inc. LTC3374AIFE#PBF
- Part No.:
- LTC3374AIFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3374AIFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
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Product details
Overview
LTC3374AIFE#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 integrated die temperature monitoring. It supports master-slave configurations up to 4A per output using shared inductors and targets multichannel power delivery in automotive infotainment and industrial control systems.
For engineers reviewing the LTC3374AIFE#PBF datasheet, LTC3374AIFE#PBF pinout, LTC3374AIFE#PBF application, or LTC3374AIFE#PBF equivalent, key selection considerations include per-channel enable control, phase-shifted switching for EMI reduction, overvoltage indication, PGOOD_ALL status aggregation, and thermal monitoring via TEMP pin voltage slope (7mV/°C).
Technical Context
The LTC3374AIFE#PBF integrates eight independent synchronous buck regulators with PMOS/NMOS power stages, each supporting 0.8V to VIN output range and configurable operating mode (Burst Mode® or forced continuous) via the MODE pin. All channels share a common oscillator that can be programmed with RT resistor, synchronized externally via SYNC, or set to internal 2MHz default.
Phase interleaving is fixed at 90° steps across all eight bucks to reduce input ripple current. Each regulator features precision enable thresholds (±20mV), ±1% PGOOD accuracy, and individual feedback pins (FB1–FB8) enabling flexible output voltage programming or master-slave paralleling-up to four converters per group-with dedicated EN1–EN8 control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per channel - supports diverse rail inputs including 3.3V, 5V, and partially discharged battery sources. |
| Output Current Capability | Up to 1A per channel standalone; up to 4A per group via parallel configuration - enables scalable power delivery without external current-sharing circuitry. |
| Feedback Accuracy | ±1% for Buck 1 (VFB1 = 800mV typ); ±1.6% for Bucks 2–8 (VFB2–8 = 800mV ±16mV) - ensures tight regulation critical for FPGA core and memory I/O rails. |
| Oscillator Frequency | 1MHz to 3MHz programmable via RT pin; 2MHz default - allows optimization of efficiency vs. size trade-off using smaller inductors at higher frequencies. |
| Overvoltage Detection | 107.5% ±1.5% of regulated VOUT - provides fail-safe protection against feedback divider failure or transient overshoot. |
| Die Temperature Monitor | 220mV at 25°C, 7mV/°C slope - enables real-time junction temperature estimation without external sensor, supporting thermal derating logic. |
| Package Thermal Resistance | θJA = 25°C/W (TSSOP) - lower than QFN variant (34°C/W), improving power dissipation capability in constrained layouts. |
Pinout & Package
The LTC3374AIFE#PBF is housed in a 38-lead plastic TSSOP package with exposed pad (Pin 39 = GND), rated for –40°C to 125°C operation. The exposed pad must be soldered to PCB ground plane for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1–EN8 | Active-high enable inputs | Independent control of each buck; precise rising/falling thresholds (e.g., EN1 rising = 400–1200mV) simplify autonomous power-up sequencing. |
| FB1–FB8 | Feedback inputs | Close regulation loop; FB2–FB8 tied to respective VINx enables master-slave paralleling (e.g., FB2→VIN2 configures Buck2 as slave to Buck1). |
| SW1–SW8 | Switch node outputs | Connect to external inductors; phase-shifted 90° switching reduces input capacitor RMS current by ~30% vs. non-interleaved design. |
| VIN1–VIN8 | Independent input supplies | Each accepts 2.25V–5.5V; shorting adjacent VINs (e.g., VIN2→VIN1) implements current sharing without external diodes or controllers. |
| PGOOD_ALL | Open-drain status output | Asserts low if any enabled buck's output falls below 94–99% or exceeds 106–109% of target - single-point system health monitoring. |
| TEMP | Analog temperature monitor | Outputs 220mV ±20mV at 25°C with 7mV/°C slope; tie to VCC to disable and save 12µA quiescent current. |
| MODE | Operating mode select | Low = Burst Mode® for light-load efficiency; high = forced continuous mode for low-noise, predictable ripple. |
| SYNC / RT | Oscillator control | SYNC accepts external clock (1–3MHz); RT sets frequency via resistor (e.g., 400kΩ → 2MHz); both pins require pull-down or termination to avoid floating. |
Key Features
| Feature | Design Value |
|---|---|
| Eight independent 1A synchronous bucks | Enables discrete power domains for SoC cores, I/O, memory, and peripherals - eliminates need for multiple discrete regulators. |
| Configurable master-slave grouping (15 combinations) | Supports 2A/3A/4A outputs with single inductor per group - reduces BOM count, layout area, and magnetic coupling risk. |
| 90° phase interleaving | Reduces input ripple amplitude and RMS current, allowing smaller input capacitors and lower EMI filter complexity. |
| AEC-Q100 qualified (Grade I) | Validated for automotive applications including ADAS domain controllers and infotainment head units requiring –40°C to 125°C operation. |
| Integrated overvoltage indicator | Detects >107.5% VOUT with 2–4% hysteresis - protects downstream logic from catastrophic overvoltage events without external comparators. |
Applications
| Automotive Infotainment System | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering display interface, audio codec, and MCU subsystems in a head unit with isolated 3.3V, 2.5V, and 1.8V rails. IC Role / Device Role / Timing Role: LTC3374AIFE#PBF delivers eight regulated outputs from separate battery-derived inputs, with sequenced enable via EN1–EN8 and PGOOD_ALL monitoring. Use Value: Eliminates six discrete regulators and associated passives; phase interleaving cuts input capacitance by 40% versus discrete implementation. | Use Scenario: Supplying field-programmable gate array (FPGA), ADC/DAC, and isolation barrier circuits in modular I/O cards. IC Role / Device Role / Timing Role: LTC3374AIFE#PBF provides 1.2V core, 2.5V I/O, 3.3V analog, and 5V isolated bias rails with independent enable and thermal monitoring. Use Value: Die temperature sensing enables dynamic load shedding before thermal shutdown; ±1% VFB1 ensures FPGA core stability under varying process corners. |
| Communications Baseband Processor | Medical Imaging Sensor Array |
Use Scenario: Generating multiple low-noise, tightly regulated rails for RF transceivers, baseband DSPs, and memory interfaces in small-cell equipment. IC Role / Device Role / Timing Role: LTC3374AIFE#PBF operates in forced continuous mode (MODE = high) to minimize switching noise on sensitive analog sections. Use Value: 2MHz default switching frequency allows use of 1.0µH inductors, reducing solution size by 35% vs. 1MHz designs with same ripple. | Use Scenario: Powering CMOS image sensors, column ADCs, and timing controllers in portable ultrasound probes requiring ultra-low EMI. IC Role / Device Role / Timing Role: LTC3374AIFE#PBF uses Burst Mode® (MODE = low) during standby and forced continuous during acquisition, optimizing efficiency across duty cycles. Use Value: 90° phase shift lowers peak input current by 55%, easing compliance with CISPR-11 Class B conducted emissions limits. |
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; QFN package (θJA = 34°C/W) vs. TSSOP (θJA = 25°C/W); different thermal performance and board assembly requirements. | Better suited for space-constrained layouts where thermal vias under QFN pad are feasible; less optimal for high-power density without aggressive heatsinking. | Select LTC3374AEFE#PBF when PCB stack-up supports thermal vias and footprint area is limited; choose LTC3374AIFE#PBF for simpler reflow and higher thermal margin in standard TSSOP land patterns. |
| TPS65218D0RSLR | 6-channel PMIC with integrated LDOs, battery charger, and fuel gauge; not pin-compatible; lower per-channel current (1A max, no paralleling); no die temperature monitor. | Targeted at single-battery portable devices (e.g., tablets); lacks independent VIN supplies and master-slave flexibility of LTC3374A. | Choose TPS65218D0RSLR only for cost-sensitive, battery-powered applications needing integrated charging; LTC3374AIFE#PBF remains superior for multi-rail, multi-supply industrial or automotive systems. |
Compared with LTC3374AEFE#PBF, the LTC3374AIFE#PBF offers lower thermal resistance in TSSOP packaging for improved reliability in convection-cooled environments; versus TPS65218D0RSLR, it provides true independent input rails, scalable current via paralleling, and diagnostic-level thermal monitoring - critical for mission-critical power domains.
Availability
LTC3374AIFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, and communications baseband processors requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LTC3374AIFE#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, configurable multichannel DC/DC power solutions targeting space- and thermal-constrained applications where independent input rails, precise sequencing, and robust fault monitoring are essential.
FAQ
What is the maximum output current achievable per channel using LTC3374AIFE#PBF?
The LTC3374AIFE#PBF supports up to 1A per individual buck regulator. When configured in master-slave groups, it achieves up to 4A per output using shared inductors - for example, combining Bucks 1–4 yields a 4A rail with single inductor and coordinated control. Current limit scales with paralleled channels: 1.4A (1 buck), 3.6A (2 bucks), 5.4A (3 bucks), 7.2A (4 bucks), per datasheet ILIM specifications.
Does LTC3374AIFE#PBF support synchronization to an external clock source?
Yes, the LTC3374AIFE#PBF supports external clock synchronization via the SYNC pin. Driving SYNC with a clean TTL/CMOS clock signal (1MHz–3MHz, tLOW/tHIGH >40ns) synchronizes all eight buck regulators to that frequency. Slope compensation automatically adapts to maintain stability. If unused, SYNC must be tied to GND - floating is prohibited.
How does the TEMP pin on LTC3374AIFE#PBF provide die temperature information?
The TEMP pin on LTC3374AIFE#PBF outputs an analog voltage proportional to junction temperature: 220mV (typical) at 25°C with a slope of 7mV/°C (typical). This allows direct measurement using an external ADC or comparator. To disable the monitor and save ~12µA quiescent current on VCC, connect TEMP to VCC. The pin must never be left floating.
Can LTC3374AIFE#PBF operate with different input voltages on each channel?
Yes, LTC3374AIFE#PBF is explicitly designed for independent input supplies: VIN1–VIN8 each accept 2.25V to 5.5V, enabling heterogeneous power sources such as separate LDO outputs, battery taps, or isolated DC/DC rails. This architecture supports complex power architectures like partial system wake-up while keeping other domains powered down.
What is the purpose of the MODE pin on LTC3374AIFE#PBF?
The MODE pin on LTC3374AIFE#PBF selects the operating mode for all eight buck regulators: logic low enables Burst Mode® operation for highest light-load efficiency, while logic high forces continuous conduction mode for lowest output voltage ripple and predictable EMI profile. Thresholds are VIH = 1.2V (min), VIL = 0.4V (max); the pin must be actively driven or pulled to a valid logic level - no floating.
LTC3374AIFE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3374AIFE#PBF FAQ
1.How can I place an order for LTC3374AIFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374AIFE#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 LTC3374AIFE#PBF reliable?
The price and inventory of LTC3374AIFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374AIFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3374AIFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374AIFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374AIFE#PBF?
LTC3374AIFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374AIFE#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 LTC3374AIFE#PBF?
For technical support, including LTC3374AIFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374AIFE#PBF requirements.
6.How does Aetrix verify that LTC3374AIFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3374AIFE#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 LTC3374AIFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3374AIFE#PBF?
All LTC3374AIFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374AIFE#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 LTC3374AIFE#PBF part is unused and in its original packaging.
Return procedure for LTC3374AIFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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