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Analog Devices Inc. LTC3418EUHF#PBF
- Part No.:
- LTC3418EUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3418EUHF#PBF.pdf
- Description:
- IC REG BUCK ADJ 8A 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:234
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Product details
Overview
LTC3418EUHF#PBF 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 range, 35mΩ P-FET and 25mΩ N-FET RDS(ON), and programmable 300kHz–4MHz switching frequency. It serves as a high-density point-of-load power supply for microprocessor core rails in notebook computers and DSP systems.
For engineers reviewing the LTC3418EUHF#PBF datasheet, LTC3418EUHF#PBF pinout, LTC3418EUHF#PBF application, or LTC3418EUHF#PBF equivalent, key selection considerations include its OPTI-LOOP® compensation for transient response optimization, tracking input for supply sequencing, Burst Mode® operation with adjustable burst clamp, 0.8V ±1% reference accuracy, and thermal performance enabled by the exposed PGND pad in the 38-lead QFN package.
Technical Context
The LTC3418EUHF#PBF employs constant-frequency current-mode control with internal slope compensation recovery to maintain peak inductor current stability across duty cycles >50%. Its dual MOSFET architecture integrates a 35mΩ P-channel high-side switch and 25mΩ N-channel synchronous rectifier, eliminating external diode losses.
Control logic supports three operating modes via the SYNC/MODE pin: forced continuous (tied to SVIN), Burst Mode® (0–1V clamp voltage), or external clock synchronization (300kHz–4MHz). The TRACK pin enables precise voltage ramping for coordinated power-up sequencing with auxiliary supplies, while the PGOOD open-drain output monitors ±7.5% output regulation tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8A max - supports high-current microprocessor core rails without external parallel devices |
| 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 via resistive divider; 0.8V ±1% reference enables sub-1V core supplies |
| Switching Frequency | 300kHz to 4MHz - externally resistor-programmable or synchronizable to external clock |
| RDS(ON) (P-FET) | 35mΩ typical - reduces conduction loss at high load currents and low VIN |
| RDS(ON) (N-FET) | 25mΩ typical - enables high-efficiency synchronous rectification down to light loads |
| Quiescent Current | 380µA - minimizes standby power in battery-powered systems during active operation |
| Thermal Package | 38-lead 5mm × 7mm QFN with exposed PGND pad - θJA = 34°C/W enables 8A operation without forced airflow |
Pinout & Package
Package: 38-lead (7mm × 5mm) plastic QFN, 0.75mm profile, exposed thermal pad (Pin 39) soldered to PGND for electrical and thermal integrity.
| 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 tight layout to minimize EMI and voltage spikes |
| PVIN (3,4,9,10,22,23,28,29) | Power input supply | Distributed VIN connections reduce IR drop and improve high-frequency decoupling across all four corners |
| PGOOD (5) | Open-drain status output | Asserts low when VOUT deviates >±7.5%; used for system power-good sequencing and fault reporting |
| RT (6) | Oscillator timing input | Resistor-to-ground sets switching frequency; supports 300kHz–4MHz range with ±12% tolerance |
| RUN/SS (7) | Enable and soft-start control | Pull <0.5V to shut down; capacitor-to-ground controls output voltage ramp time and inrush current |
| SGND (8) | Signal ground reference | Separate from PGND; connects feedback, compensation, and small-signal components to minimize noise coupling |
| PGND (13–15,17–19,32–34,36–38) | Power ground return | Multiple low-inductance paths to CIN/COUT (–) terminals; must connect to exposed pad (Pin 39) |
| VREF (16) | 1.25V reference output | Capable of sourcing 5mA; decoupled with ≥2.2µF for low-noise analog subsystems or external biasing |
| SVIN (24) | Signal supply input | Bias source for internal comparators and logic; decoupled to SGND to prevent signal ground contamination |
| VFB (25) | Feedback input | Monitors resistive divider output; regulates VOUT to 0.8V reference with ±1% accuracy over temperature |
| ITH (26) | Error amplifier output | Controls peak inductor current; nominal 0.2V–1.4V range; used for loop compensation and burst clamp monitoring |
| SYNC/MODE (27) | Mode select & sync input | Configures forced continuous (SVIN), Burst Mode® (0–1V), or external clock sync (300kHz–4MHz) |
| TRACK (35) | Voltage tracking input | Enables supply sequencing; regulates VOUT to TRACK voltage until >1.05V, then transitions to full regulation |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® compensation | Allows external compensation network tuning to optimize transient response across wide output capacitance and load ranges |
| Adjustable Burst Clamp | External voltage on SYNC/MODE pin sets minimum peak inductor current (0–10A), enabling ripple vs. efficiency trade-off control |
| Tracking input (TRACK) | Supports precise voltage ramping for coordinated startup of core and I/O rails, preventing latch-up in microprocessors and FPGAs |
| 100% duty cycle operation | Enables dropout operation down to VOUT + VDS(ON) × ILOAD, critical for low-VIN applications like single-cell Li-ion systems |
| Overtemperature protection | Thermal shutdown activates at TJ = 125°C; device resumes operation after cooldown, ensuring robust field reliability |
Applications
| Microprocessor Core Supply | DSP/FPGA Core Rail |
|---|---|
Use Scenario: Powering ARM Cortex-A series or Intel Atom processor cores requiring tightly regulated 0.85V–1.2V at up to 8A with fast load transients. IC Role / Device Role / Timing Role: Primary buck regulator providing dynamic voltage scaling (DVS) and rapid transient response via OPTI-LOOP® compensation. Use Value: Maintains <±1% output regulation during 8A load steps with <20µs recovery, minimizing core voltage droop and preventing timing violations. | Use Scenario: Delivering 1.0V or 1.2V to high-performance DSPs (e.g., TI C6000) or Xilinx Artix-7 FPGAs with bursty computational loads. IC Role / Device Role / Timing Role: High-current POL regulator supporting dynamic power management and low-noise analog subsystems via clean VREF output. Use Value: Achieves >92% efficiency at 4A and >85% at 100mA using Burst Mode®, extending battery life in portable test equipment and edge AI accelerators. |
| Notebook System Power | Automotive Infotainment SoC |
Use Scenario: Generating 1.8V or 2.5V for DDR memory interfaces and chipset I/O in ultra-thin notebooks with strict thermal envelope limits. IC Role / Device Role / Timing Role: Dual-rail regulator using TRACK pin to sequence memory I/O voltage after core voltage, preventing bus contention and data corruption. Use Value: Eliminates need for external sequencing ICs; reduces BOM count and PCB area while meeting JEDEC JESD78 latch-up immunity requirements. | Use Scenario: Supplying 1.1V core and 1.8V I/O rails to automotive-grade SoCs (e.g., NXP i.MX8) in infotainment head units operating from 9–16V battery input via pre-regulator. IC Role / Device Role / Timing Role: Secondary buck stage delivering stable, low-noise power under wide ambient temperature (–40°C to 85°C) and high EMI conditions. Use Value: Sustains 8A output with <30mV ripple at 4MHz switching, reducing filter size and meeting CISPR-25 Class 5 radiated emissions limits. |
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 |
|---|---|---|---|
| TPS54821RHLR | 6A max output, 4.5–20V input, integrated FETs with 12mΩ/8mΩ RDS(ON), fixed 500kHz/1MHz switching | Higher input range but lower current rating; lacks TRACK pin and adjustable burst clamp | Select when higher VIN (>5.5V) is required and 6A suffices; not suitable for precise supply sequencing or sub-1V outputs |
| MP2384CGQ-P | 8A output, 4.5–18V input, 3.5MHz max frequency, no TRACK or VREF pins, 0.6V reference | Wider VIN range but no voltage tracking or auxiliary reference; simpler feature set, lower cost | Choose for cost-sensitive industrial applications where sequencing and analog biasing are unnecessary |
Compared with TPS54821RHLR and MP2384CGQ-P, the LTC3418EUHF#PBF uniquely combines 8A capability with 0.8V reference, TRACK sequencing, and programmable burst clamp-making it optimal for high-performance portable and embedded computing where precision rail control and thermal density are critical.
Availability
LTC3418EUHF#PBF is available at Aetrix Electronics and suitable for notebook computers, DSP/FPGA power systems, automotive infotainment SoCs, and microprocessor core supplies requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LTC3418EUHF#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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3418EUHF#PBF belongs to ADI's Power by Linear™ family of high-efficiency monolithic DC/DC regulators, designed specifically for demanding point-of-load applications in computing, communications, and automotive electronics where thermal density, transient response, and supply sequencing are critical.
FAQ
What is the maximum output current capability of the LTC3418EUHF#PBF?
The LTC3418EUHF#PBF delivers up to 8A of continuous output current under typical thermal conditions (TA = 25°C, 4-layer PCB with 2oz copper and exposed pad soldered). Derating is required above 85°C ambient or with reduced copper area; peak current limit is internally set to 12–17A. The actual achievable current depends on input/output voltage, switching frequency, inductor DCR, and PCB thermal design - full 8A operation requires adherence to recommended layout guidelines in the LTC3418EUHF#PBF datasheet.
How does the TRACK pin function in the LTC3418EUHF#PBF?
The TRACK pin on the LTC3418EUHF#PBF enables precise voltage ramping during power-up to coordinate sequencing with another supply. When a ramp voltage (0–0.8V) is applied to TRACK, the LTC3418EUHF#PBF regulates its output to match that voltage. Once TRACK exceeds 0.8V, regulation gradually transitions to the internal 0.8V reference, completing at 1.05V. This prevents latch-up in microprocessors and FPGAs by ensuring I/O rails power up only after core rails reach safe bias levels - no external sequencing IC is needed.
Can the LTC3418EUHF#PBF operate with an input voltage below 2.25V?
No, the LTC3418EUHF#PBF has a specified minimum input voltage of 2.25V per Absolute Maximum Ratings and Electrical Characteristics. Operation below this threshold is not guaranteed and may result in improper regulation, failure to start, or undefined behavior. The undervoltage lockout (UVLO) threshold is 1.75–2.25V, but functional operation begins only above 2.25V. For sub-2.25V applications, consider alternative regulators such as the LTC3642 or ADP5054.
What is the purpose of the VREF pin on the LTC3418EUHF#PBF?
The VREF pin on the LTC3418EUHF#PBF provides a stable, low-noise 1.25V reference output capable of sourcing up to 5mA. It is generated by an internal linear regulator and intended for biasing external circuitry such as ADC references, sensor excitation, or op-amp level-shifting networks. To ensure stability and low noise, the VREF pin must be decoupled with a minimum 2.2µF ceramic capacitor to SGND - this is mandatory per the LTC3418EUHF#PBF datasheet and affects overall system accuracy.
Does the LTC3418EUHF#PBF support synchronization to an external clock?
Yes, the LTC3418EUHF#PBF supports external clock synchronization via the SYNC/MODE pin. When driven with a TTL/CMOS-compatible clock signal between 300kHz and 4MHz, the internal oscillator locks to the external frequency. The RT resistor should be selected for a frequency ~25% lower than the sync clock to ensure reliable capture. During synchronization, Burst Mode® is disabled and burst clamp is set to 0V - each switching cycle starts on the falling edge of the external clock, enabling deterministic timing for noise-sensitive applications.
LTC3418EUHF#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:
- 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#PBF FAQ
1.How can I place an order for LTC3418EUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3418EUHF#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 LTC3418EUHF#PBF reliable?
The price and inventory of LTC3418EUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3418EUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3418EUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3418EUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3418EUHF#PBF?
LTC3418EUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3418EUHF#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 LTC3418EUHF#PBF?
For technical support, including LTC3418EUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3418EUHF#PBF requirements.
6.How does Aetrix verify that LTC3418EUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3418EUHF#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 LTC3418EUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3418EUHF#PBF?
All LTC3418EUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3418EUHF#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 LTC3418EUHF#PBF part is unused and in its original packaging.
Return procedure for LTC3418EUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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