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Analog Devices Inc. LTC3418EUHF#TRPBF
- Part No.:
- LTC3418EUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3418EUHF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 8A 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,557
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Product details
Overview
LTC3418EUHF#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator delivering up to 8A output current at 0.8V–5V with 2.25V–5.5V input, 4MHz max switching frequency, and 35mΩ P-FET RDS(ON). It serves as a high-density point-of-load power supply for microprocessor core rails in notebook computers and distributed power systems.
For engineers reviewing the LTC3418EUHF#TRPBF datasheet, LTC3418EUHF#TRPBF pinout, LTC3418EUHF#TRPBF application, or LTC3418EUHF#TRPBF equivalent, key selection criteria include its programmable 300kHz–4MHz frequency, tracking input for supply sequencing, OPTI-LOOP® compensation, Burst Mode® vs forced continuous mode trade-offs, and thermal performance in the 38-lead 5mm × 7mm QFN package.
Technical Context
The LTC3418EUHF#TRPBF employs a constant-frequency current-mode control architecture with internal P-channel and N-channel MOSFETs (35mΩ/25mΩ typical RDS(ON)). Its error amplifier regulates VFB to 0.8V ±1% using an external resistor divider, while ITH voltage controls peak inductor current via slope-compensated current sensing.
It supports three operating modes via SYNC/MODE pin: forced continuous (tied to SVIN), Burst Mode® (0–1V clamp), or external clock synchronization (300kHz–4MHz). The TRACK pin enables precise voltage ramping for multi-rail sequencing, and PGOOD provides ±7.5% output voltage monitoring with open-drain logic output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8A continuous - supports high-current microprocessor core rails without external FETs |
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-ion, 3.3V, and 5V intermediate bus architectures |
| Output Voltage Range | 0.8V to 5V - set by external resistor divider; 0.8V ±1% reference enables sub-1V core supplies |
| Switching Frequency | 300kHz to 4MHz - adjustable via RT resistor or external clock; enables compact magnetics at high frequencies |
| P-FET RDS(ON) | 35mΩ typical - reduces conduction loss at high load currents and low duty cycles |
| N-FET RDS(ON) | 25mΩ typical - minimizes bottom-switch loss during synchronous rectification |
| Quiescent Current | 380µA - enables high light-load efficiency in battery-powered systems |
| Thermal Package | 38-lead 5mm × 7mm QFN with exposed PGND pad - θJA = 34°C/W supports 8A operation with standard PCB copper |
Pinout & Package
Package: 38-lead (7mm × 5mm) plastic QFN, 0.75mm profile, exposed thermal pad (Pin 39 = PGND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2,11,12,20,21,30,31) | Switch node | Connects to inductor; carries high di/dt current; requires low-inductance layout to minimize EMI |
| PVIN (3,4,9,10,22,23,28,29) | Power input supply | Multiple pins reduce IR drop and thermal resistance; must be decoupled locally to PGND |
| PGOOD (5) | Open-drain power-good monitor | Asserts low when VOUT deviates >±7.5%; used for system enable sequencing and fault detection |
| RT (6) | Oscillator timing resistor input | Sets switching frequency from 300kHz–4MHz; resistor value calculated per ROSC = (7.3×10¹⁰/f) – 2.5kΩ |
| RUN/SS (7) | Enable and soft-start control | Shuts down device below 0.5V; capacitor to ground sets output ramp time and inrush current limiting |
| SGND (8) | Signal ground reference | Reference for feedback, compensation, and small-signal circuitry; connects to PGND at single point |
| VREF (16) | 1.25V precision reference output | Capable of sourcing 5mA; decoupled with ≥2.2µF for low-noise biasing of external circuits |
| VFB (25) | Feedback input | Monitors resistive divider output; regulates to 0.8V ±1% over temperature and line/load |
| ITH (26) | Error amplifier output / current limit control | Voltage (0.2V–1.4V) sets peak inductor current threshold; critical for loop stability and transient response |
| SYNC/MODE (27) | Mode select and sync input | Configures forced continuous (SVIN), Burst Mode® (0–1V), or external clock sync (300kHz–4MHz) |
| TRACK (35) | Voltage tracking input | Enables supply sequencing: feedback regulates to TRACK voltage until it exceeds 1.05V |
| Exposed Pad (39) | Power ground and thermal path | Must be soldered to large PCB copper area for electrical continuity and thermal dissipation (θJC = 1°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® compensation | Allows dynamic loop optimization across wide output capacitance and load ranges without external compensation redesign |
| Programmable Burst Clamp | External voltage on SYNC/MODE sets minimum peak inductor current (0–10A), enabling precise ripple vs efficiency trade-off |
| 100% duty cycle operation | Supports ultra-low dropout regulation-output tracks input minus P-FET RDS(ON) × ILOAD-critical for battery brownout conditions |
| Tracking input with 0–0.8V range | Enables monotonic start-up sequencing between core and I/O rails to prevent latch-up in FPGAs and memory interfaces |
| Low RDS(ON) dual MOSFETs | 35mΩ P-FET + 25mΩ N-FET reduce conduction losses and improve full-load efficiency to 95% |
| Overtemperature protection | Thermal shutdown at TJ = 125°C with automatic recovery prevents permanent damage during sustained overload or poor airflow |
Applications
| Microprocessor Core Supply | Distributed 3.3V Power System |
|---|---|
Use Scenario: Providing regulated 1.2V/8A core voltage to Intel/AMD mobile CPUs in ultrabooks with tight thermal envelopes. IC Role / Device Role / Timing Role: Primary buck regulator with fast transient response and sequencing control via TRACK pin. Use Value: Delivers 95% peak efficiency at 8A while maintaining <±1% output accuracy and enabling safe core/I/O rail sequencing. | Use Scenario: Generating 3.3V/6A from a 5V intermediate bus in industrial PLC backplanes with multiple peripheral modules. IC Role / Device Role / Timing Role: High-current point-of-load converter with programmable frequency to avoid noise coupling into analog signal paths. Use Value: 4MHz operation allows use of 0.22µH inductors and ceramic capacitors, reducing board area by >40% vs 500kHz solutions. |
| Automotive Infotainment SoC | Notebook GPU Voltage Rail |
Use Scenario: Powering 1.8V/5A application processor in automotive head units requiring AEC-Q200-compliant design margins. IC Role / Device Role / Timing Role: Synchronous buck regulator with robust input UVLO (1.75–2.25V) and PGOOD monitoring for functional safety diagnostics. Use Value: 380µA quiescent current extends battery runtime in always-on infotainment standby mode. | Use Scenario: Delivering dynamically scaled 0.9–1.3V/7A to discrete GPUs in gaming laptops during burst workloads. IC Role / Device Role / Timing Role: Fast-transient buck with Burst Mode® for idle efficiency and forced continuous mode for low-noise rendering phases. Use Value: Adjustable burst clamp on SYNC/MODE pin lets designers tune output ripple to match GPU voltage tolerance specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4572GLED-AEC1-P | 40V max input, 7A output, fixed 500kHz/2.2MHz freq; AEC-Q200 qualified; no TRACK or VREF pins | Targeted at automotive 12V/24V systems; lacks voltage tracking and precision reference for sequencing-critical designs | Select when high-input-voltage resilience and automotive qualification outweigh need for rail sequencing and auxiliary reference |
| TPS548D22RURLR | 20A output, 4.5–18V input, 300kHz–2MHz freq; integrated PMBus interface; no Burst Mode® | Designed for server VR13/IMVP8 compliance; supports digital telemetry and phase interleaving; higher cost and complexity | Select when digital control, telemetry, and >10A capability justify added subsystem overhead and BOM cost |
Compared with MPQ4572GLED-AEC1-P and TPS548D22RURLR, the LTC3418EUHF#TRPBF offers superior light-load efficiency via Burst Mode®, precise analog rail sequencing via TRACK, and a buffered 1.25V reference-making it optimal for space-constrained, multi-rail embedded systems where analog control simplicity and sequencing integrity are prioritized over digital interface or ultra-high current.
Availability
LTC3418EUHF#TRPBF is available at Aetrix Electronics and suitable for notebook computers, automotive infotainment systems, and distributed 3.3V power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3418EUHF#TRPBF 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 characterization and reliability testing.
The LTC3418EUHF#TRPBF belongs to Linear's monolithic high-current buck regulator family, designed specifically for demanding point-of-load applications in computing, communications, and industrial systems where efficiency, thermal performance, and analog control fidelity are critical.
FAQ
What is the maximum output current capability of the LTC3418EUHF#TRPBF?
The LTC3418EUHF#TRPBF delivers up to 8A of continuous output current under typical thermal conditions (θJA = 34°C/W, 4-layer PCB with 2oz copper). Peak current limit is internally set to 12–17A, but sustained 8A operation requires proper thermal design-including soldering the exposed pad to a large PGND copper area-to maintain junction temperature below 125°C.
How does the TRACK pin function in the LTC3418EUHF#TRPBF?
The TRACK pin on the LTC3418EUHF#TRPBF enables precise voltage sequencing: during startup, the feedback loop regulates VOUT to match the voltage applied to TRACK (0–0.8V range); once TRACK exceeds 1.05V, regulation transitions fully to the internal 0.8V reference. This ensures monotonic ramping of core and I/O rails to prevent latch-up in FPGAs and memory interfaces.
Can the LTC3418EUHF#TRPBF operate with a 2.25V input supply?
Yes, the LTC3418EUHF#TRPBF is fully specified to operate down to 2.25V input. At this minimum VIN, RDS(ON) of both internal MOSFETs increases, so thermal design must account for higher conduction losses-especially near 100% duty cycle. Efficiency remains >85% at 8A/1.2V output with 2.25V input when properly heatsinked.
What is the purpose of the VREF pin on the LTC3418EUHF#TRPBF?
The VREF pin on the LTC3418EUHF#TRPBF provides a buffered 1.25V ±1% reference capable of sourcing up to 5mA. It is intended for biasing external circuitry such as ADC references or sensor excitation-decoupling with ≥2.2µF ceramic capacitor is mandatory to ensure stability and low noise, as specified in the datasheet.
How do I configure the LTC3418EUHF#TRPBF for Burst Mode® operation?
To enable Burst Mode® on the LTC3418EUHF#TRPBF, apply a DC voltage between 0V and 1V to the SYNC/MODE pin. This voltage sets the burst clamp level (IBURST), which determines the minimum peak inductor current per cycle. For example, 0.4V yields ~2A IBURST; lower voltages reduce ripple but increase sleep-mode duration and output voltage deviation.
LTC3418EUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 8A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3418EUHF#TRPBF FAQ
1.How can I place an order for LTC3418EUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3418EUHF#TRPBF 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 LTC3418EUHF#TRPBF reliable?
The price and inventory of LTC3418EUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3418EUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3418EUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3418EUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3418EUHF#TRPBF?
LTC3418EUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3418EUHF#TRPBF 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 LTC3418EUHF#TRPBF?
For technical support, including LTC3418EUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3418EUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3418EUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3418EUHF#TRPBF 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 LTC3418EUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3418EUHF#TRPBF?
All LTC3418EUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3418EUHF#TRPBF, 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 LTC3418EUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3418EUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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