My Inquiry
My Account
Analog Devices Inc. LTC3374HUHF#PBF
- Part No.:
- LTC3374HUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3374HUHF#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8OUT 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,819
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3374HUHF#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 8-channel synchronous buck DC/DC regulator IC with independent 1A per channel capability, 2.25V–5.5V input range per channel, 0.8V–VIN output range, and thermally enhanced 38-lead 5mm × 7mm QFN package rated for –40°C to 150°C junction temperature. It enables flexible multi-rail power delivery in space-constrained industrial and automotive control systems.
For engineers reviewing the LTC3374HUHF#PBF datasheet, LTC3374HUHF#PBF pinout, LTC3374HUHF#PBF application, or LTC3374HUHF#PBF equivalent, key selection considerations include per-channel enable precision (±40 mV hysteresis), programmable 1–3 MHz switching frequency, 90° phase interleaving for EMI reduction, die temperature monitoring via TEMP pin, and master-slave parallel configuration supporting up to 4A per rail with shared inductor.
Technical Context
The LTC3374HUHF#PBF integrates eight fully independent synchronous buck regulators, each with dedicated VIN, SW, FB, and EN pins, enabling true multi-supply domain operation. All channels share a common oscillator that can be programmed via RT resistor, synchronized externally via SYNC, or set to internal 2 MHz default.
Operating mode (Burst Mode® vs forced continuous) is globally controlled by the MODE pin; PGOOD_ALL provides system-level fault reporting; TEMP pin delivers linear 6.75 mV/°C voltage proportional to die temperature; and phase interleaving across eight channels reduces input ripple current by distributing switching events at 90° intervals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per channel - supports diverse supply domains including 3.3V, 2.5V, and 5V rails without level-shifting. |
| Output Voltage Range | 0.8V to VIN - enables generation of sub-1V core supplies (e.g., 0.85V FPGA I/O) and adjustable intermediate rails. |
| Max Output Current | 1A per channel (up to 4A per rail when paralleled) - allows scalable current delivery while maintaining thermal margin via phase interleaving. |
| Switching Frequency | 1MHz to 3MHz (programmable) - higher frequencies permit smaller magnetics; 2MHz default balances efficiency and size for typical 1.8V/2.5V loads. |
| Enable Threshold Accuracy | ±40 mV hysteresis, 400–1200 mV rising threshold - ensures reliable autonomous power-up sequencing across multiple rails. |
| Die Temp Monitoring | 150 mV @ 25°C, 6.75 mV/°C slope - enables real-time thermal management and overtemperature shutdown at 165°C. |
| Package | 38-lead 5mm × 7mm QFN with exposed GND pad - achieves θJA = 34°C/W for high-power density in compact PCB layouts. |
Pinout & Package
Package: 38-lead plastic QFN (5mm × 7mm), exposed thermal pad (Pin 39 = GND), rated for –40°C to 150°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB8 | Feedback input for buck regulators 1–8 | Connects to resistor divider to set output voltage; shorting FBx to VINx enables master-slave parallel configuration. |
| VIN1–VIN8 | Independent input supply for each buck channel | Each accepts 2.25V–5.5V; may be sourced from separate rails or tied together for shared input. |
| SW1–SW8 | Switch node for buck regulators 1–8 | Connects to external inductor; requires low-ESR ceramic output capacitors and careful layout for EMI control. |
| EN1–EN8 | Active-high enable inputs | Enable individual channels; precision thresholds support deterministic power sequencing without external supervisors. |
| PGOOD_ALL | Open-drain system power-good indicator | Asserts low if any enabled buck output drops >7.5% below regulation - used for system reset or fault logging. |
| TEMP | Digital die temperature monitor output | Provides analog voltage (150 mV @ 25°C, +6.75 mV/°C) for thermal feedback or overtemperature warning before shutdown. |
| MODE | Global operating mode select | Low = Burst Mode® (high light-load efficiency); High = forced continuous (low noise, fixed-frequency PWM). |
| SYNC / RT | Oscillator control interface | SYNC accepts external clock (1–3 MHz); RT sets frequency via resistor (1–3 MHz) or selects 2 MHz internal default when tied to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| 8 independent 1A buck regulators | Enables discrete power domains for mixed-voltage SoCs, FPGAs, and sensor subsystems without external controllers. |
| Configurable parallel operation (up to 4A/rail) | Reduces component count and board area by combining channels with shared inductors and single feedback network. |
| 90° phase interleaving | Cuts input RMS current by ~30% vs. in-phase switching - lowers input capacitor stress and EMI filter requirements. |
| Precision enable thresholds with hysteresis | Supports robust, repeatable power-up sequencing across 8 rails using only passive RC networks - no sequencer IC needed. |
| Integrated die temperature sensing | Eliminates need for external thermal sensors; enables predictive thermal throttling and lifetime derating in automotive/industrial environments. |
Applications
| Industrial PLC I/O Modules | Automotive ADAS Domain Controllers |
|---|---|
Use Scenario: Powering isolated analog front-ends, digital isolators, and microcontrollers in modular I/O cards requiring multiple regulated rails (e.g., 3.3V, 2.5V, 1.8V, 1.2V) from a 5V or 24V intermediate bus. IC Role / Device Role / Timing Role: Primary multi-output PMIC delivering tightly regulated, independently sequenced supplies with thermal monitoring for long-life field deployment. Use Value: Reduces BOM count by replacing four discrete buck converters; phase interleaving minimizes conducted EMI in noisy factory environments. | Use Scenario: Supplying vision processors, radar SoCs, and CAN/FlexRay transceivers in centralized ADAS ECUs where thermal reliability and rail flexibility are critical. IC Role / Device Role / Timing Role: High-temperature-rated power manager providing 8 configurable outputs with integrated die temp sensing and fail-safe PGOOD_ALL reporting. Use Value: Enables operation up to 150°C junction temperature; TEMP pin allows closed-loop thermal management to prevent processor throttling during sustained compute loads. |
| FPGA-Based Test Equipment | 5G Small Cell Baseband Units |
Use Scenario: Generating core (0.85V), auxiliary (1.2V), I/O (1.8V/3.3V), and PLL (2.5V) supplies for Xilinx Artix/Kintex FPGAs in portable test instruments with strict size constraints. IC Role / Device Role / Timing Role: Compact, high-density power solution with per-rail enable control and soft-start timing for glitch-free FPGA configuration. Use Value: 5mm × 7mm QFN footprint saves >40% board area vs. discrete solutions; 1A/channel headroom accommodates FPGA dynamic current spikes. | Use Scenario: Powering multi-core baseband processors, RFICs, and memory interfaces in outdoor small cells exposed to wide ambient temperature swings and limited airflow. IC Role / Device Role / Timing Role: Thermally robust, multi-rail PMIC with burst-mode efficiency at idle and forced continuous mode during burst traffic. Use Value: Achieves >90% efficiency at 100mA load (Burst Mode) and <15mVpp ripple at full load (forced continuous), meeting stringent spectral mask requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3372HUFD#PBF | 4-channel version, same 1A/channel, identical 5mm × 7mm QFN package and –40°C to 150°C rating | Suitable where only 4 rails are required; lower channel count reduces complexity and cost for simpler systems | Select when system power architecture uses ≤4 independent rails and board space is less constrained than thermal budget |
| TPS6508641RSLR | TI 6-channel buck (1.5A/2A/3A configurable), 4 LDOs, integrated fuel gauge, 40-pin VQFN (6mm × 6mm), –40°C to 105°C | Includes battery management and LDOs; lacks die temperature monitor and 150°C rating; different pinout and control logic | Prefer for battery-backed portable designs needing integrated fuel gauging; avoid for high-temp industrial use due to lower max junction temperature |
Compared with LTC3372HUFD#PBF and TPS6508641RSLR, the LTC3374HUHF#PBF uniquely delivers eight independent 1A bucks in a thermally optimized 5mm × 7mm QFN with die temperature sensing and 150°C operation - making it optimal for high-channel-count, high-reliability embedded systems where thermal visibility and extended temperature range are mandatory.
Availability
LTC3374HUHF#PBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS controllers, FPGA-based instrumentation, and 5G small cell baseband units requiring stable component supply, long-term lifecycle assurance, and high-temperature reliability.
Supply support for LTC3374HUHF#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 qualification standards for industrial and automotive applications.
The LTC3374HUHF#PBF belongs to Linear's high-density multi-output buck regulator family, designed specifically for space-constrained, thermally demanding embedded systems requiring precise rail sequencing, phase interleaving, and real-time die temperature awareness.
FAQ
What is the maximum junction temperature rating for the LTC3374HUHF#PBF?
The LTC3374HUHF#PBF is specified for operation up to 150°C junction temperature, with overtemperature shutdown activating at 165°C and 10°C hysteresis. This H-grade variant is qualified for harsh environments such as under-hood automotive and industrial control cabinets where ambient temperatures exceed 105°C. The exposed pad must be soldered to a solid ground plane to achieve the rated θJA of 34°C/W.
How does the LTC3374HUHF#PBF support power sequencing across its eight channels?
The LTC3374HUHF#PBF supports autonomous power sequencing via precision enable thresholds on EN1–EN8 pins (400–1200 mV rising, ±40 mV hysteresis). By setting individual RC time constants on each EN pin, designers can stagger turn-on without external sequencers. The PGOOD_ALL pin provides system-level confirmation that all enabled rails have stabilized within 7.5% of target voltage before releasing downstream resets.
Can the LTC3374HUHF#PBF operate with different input voltages on each channel?
Yes - the LTC3374HUHF#PBF accepts independent input supplies on VIN1 through VIN8, each rated for 2.25V to 5.5V. This allows direct connection to disparate intermediate rails (e.g., 3.3V for I/O, 5V for analog, 2.5V for legacy logic) without level-shifting or external regulators. Each channel operates autonomously unless explicitly configured in master-slave mode via FB-to-VIN shorts.
What is the function of the TEMP pin on the LTC3374HUHF#PBF?
TEMP is an analog output pin that delivers a voltage linearly proportional to die temperature: 150 mV at 25°C with a slope of 6.75 mV/°C. This enables real-time thermal monitoring using a single ADC input, facilitating predictive thermal throttling or logging. It is not a digital alert - interpretation requires external conversion - but provides higher resolution than discrete thermal sensors and eliminates calibration drift over time.
How does phase interleaving improve EMI performance in the LTC3374HUHF#PBF?
The LTC3374HUHF#PBF phases its eight buck regulators in 90° increments, distributing switching events evenly across the oscillator period. This reduces peak input current demand by ~30% and lowers RMS input ripple current, which directly decreases conducted EMI on the input bus and relaxes requirements for input bulk capacitance and EMI filter size - critical for compliance in industrial and automotive EMC testing.
LTC3374HUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN 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-QFN (5x7)
LTC3374HUHF#PBF FAQ
1.How can I place an order for LTC3374HUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3374HUHF#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 LTC3374HUHF#PBF reliable?
The price and inventory of LTC3374HUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3374HUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3374HUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3374HUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3374HUHF#PBF?
LTC3374HUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3374HUHF#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 LTC3374HUHF#PBF?
For technical support, including LTC3374HUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3374HUHF#PBF requirements.
6.How does Aetrix verify that LTC3374HUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3374HUHF#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 LTC3374HUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3374HUHF#PBF?
All LTC3374HUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3374HUHF#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 LTC3374HUHF#PBF part is unused and in its original packaging.
Return procedure for LTC3374HUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3374HUHF#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
