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Analog Devices Inc. LT8614IUDC#PBF
- Part No.:
- LT8614IUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN, 18 Leads, Exposed Pad
- Datasheet:
-
LT8614IUDC#PBF.pdf
- Description:
- IC REG BUCK ADJ 4A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:704
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Product details
Overview
LT8614IUDC#PBF from Analog Devices is a 42V, 4A synchronous step-down Silent Switcher regulator with 2.5µA quiescent current in regulation, 30ns minimum on-time, and integrated power switches in a 3mm × 4mm 18-lead QFN package. It delivers up to 96% efficiency at 1MHz (12VIN→5VOUT) and supports automotive-grade operation from –40°C to 125°C.
For engineers reviewing the LT8614IUDC#PBF datasheet, LT8614IUDC#PBF pinout, LT8614IUDC#PBF application, or LT8614IUDC#PBF equivalent, key selection criteria include ultralow EMI performance, high-frequency operation up to 3MHz, Burst Mode® efficiency at microamp loads, and AEC-Q100 qualification for automotive power supplies.
Technical Context
The LT8614IUDC#PBF employs peak current mode control with internal compensation and Silent Switcher® architecture to suppress radiated EMI via symmetrical layout and minimized hot-loop area. Its fast 30ns minimum top-switch on-time enables high VIN-to-low VOUT conversion at frequencies up to 3MHz without pulse skipping.
It integrates dual power MOSFETs (85mΩ top / 40mΩ bottom), a 0.97V reference amplifier, and programmable oscillator (200kHz–3MHz via RT resistor). Operation includes Burst Mode® (2.5µA IQ) and pulse-skipping modes, with PG open-drain flag, soft-start/tracking via TR/SS, and SYNC input for external clock synchronization or mode selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery range including cold-crank and load-dump conditions. |
| Output Current | 4A continuous - sufficient for powering core logic, sensors, or infotainment subsystems from single-stage conversion. |
| Quiescent Current | 2.5µA in regulation - enables >10-year battery life in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Switching Frequency | 200kHz to 3MHz - adjustable via RT pin; allows optimization of size (high-freq) vs. efficiency (low-freq) per design constraints. |
| Min On-Time | 30ns - enables 12V-to-1.2V conversion at 2MHz, critical for high-ratio point-of-load applications. |
| Feedback Reference | 0.970V ±0.006V - tight tolerance reduces output voltage error across temperature and line/load variations. |
| EMI Performance | CISPR 25 Class 5 compliant - meets stringent automotive radiated emission limits without external filters in typical layouts. |
Pinout & Package
Package: 18-lead 3mm × 4mm plastic QFN (UDC), exposed SW pads (21, 22) for thermal management. Pin 5 and 12 are omitted; exposed pad must be soldered to SW node for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Reduces VIN current draw when tied to ≥3.1V (e.g., VOUT); improves light-load efficiency by sourcing INTVCC from BIAS instead of VIN. |
| INTVCC (2) | Internal 3.4V supply bypass | Must be decoupled with ≥1µF ceramic capacitor; powers control circuitry and gate drivers; not for external loading. |
| BST (3) | Bootstrap capacitor connection | Drives top MOSFET gate above VIN; requires 0.1µF low-ESR ceramic placed adjacent to IC for reliable high-side switching. |
| VIN1/VIN2 (4,13) | Dual input power inputs | Split VIN paths reduce high-di/dt loop area; each requires dedicated 1µF local bypass to respective GND1/GND2 for EMI suppression. |
| GND1/GND2 (6,7,10,11) | Power switch return paths | Four dedicated ground pins minimize resistance/inductance in high-current return paths; must be tied together and connected to solid ground plane. |
| SW (8,9,21,22) | Switch node outputs | Internal switch outputs tied together externally; exposed pads (21,22) must be soldered to SW trace for thermal conduction and reduced EMI. |
| EN/UV (14) | Enable and input UVLO control | Hysteretic threshold (0.94–1.06V) allows precise input undervoltage shutdown; resistor divider sets custom VIN turn-on/off points. |
| RT (15) | Oscillator frequency programming | Resistor to GND sets switching frequency from 200kHz to 3MHz; enables trade-off between inductor size and efficiency. |
| TR/SS (16) | Soft-start and output tracking | 2.2µA internal pull-up enables capacitor-programmed ramp rate; also accepts external voltage for coordinated multi-rail sequencing. |
| SYNC/MODE (17) | Mode selection and sync input | Ground = Burst Mode; DC high = pulse-skipping; external clock = synchronized operation; disables frequency foldback when active. |
| GND (18) | Signal ground reference | System ground connection for analog circuitry; must be tied to main ground plane with low-impedance path. |
| PG (19) | Power good open-drain flag | Asserts high when FB is within ±9% of 0.97V and no fault exists; valid only when VIN > 3.4V regardless of EN state. |
| FB (20) | Feedback voltage sense | Regulates to 0.970V; connects to resistor divider tap; requires 4.7–22pF phase-lead capacitor to VOUT for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Minimizes radiated EMI through balanced hot-loop layout and integrated input capacitors - eliminates need for external EMI filters in most automotive designs. |
| Ultralow Quiescent Current | 2.5µA IQ in regulation enables >10-year battery runtime in always-on vehicle modules without compromising start-up behavior or transient response. |
| Fast Minimum On-Time | 30ns enables high-step-down ratios (e.g., 12V→1.2V) at 2MHz, reducing inductor and capacitor size while maintaining stability under light loads. |
| AEC-Q100 Qualified | Rated for –40°C to 125°C junction temperature with full parametric guarantee - suitable for engine bay, ADAS, and infotainment power rails. |
| Integrated Power Switches | 85mΩ top / 40mΩ bottom NMOS with 5.7–8.5A current limit - eliminates external FETs and gate drivers, reducing BOM count and PCB area by >30% vs. controller-based solutions. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module Power |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codec in head-unit systems with 12V battery input and strict CISPR 25 EMI limits. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck converter delivering 4A with ultralow ripple and burst-mode efficiency during standby. Use Value: Meets Class 5 radiated EMI limits without ferrite beads or shielding cans, reducing system cost and board space. | Use Scenario: Supplies image sensor and ISP in forward-facing camera with cold-crank (4.5V) and load-dump (42V) resilience. IC Role / Device Role / Timing Role: High-reliability 3.3V/1.2V point-of-load regulator with AEC-Q100 qualification and 30ns min-on-time for stable low-VOUT operation. Use Value: Maintains regulation down to 4.5V input during cranking and survives 42V transients without shutdown or latch-off. |
| Telematics Control Unit (TCU) | Industrial IoT Gateway |
Use Scenario: Powers LTE modem, GNSS receiver, and MCU in always-connected vehicle trackers with 10+ year battery life requirement. IC Role / Device Role / Timing Role: Ultralow-IQ buck converter operating in Burst Mode® to sustain 2.5µA system sleep current. Use Value: Extends primary Li-SOCl₂ battery life beyond 10 years while supporting fast wake-up and full-load transient response. | Use Scenario: Provides 5V/3.3V rails for edge AI processor and wireless module in sealed industrial enclosures with limited airflow. IC Role / Device Role / Timing Role: Thermally robust 4A regulator with exposed SW pad soldered to PCB copper for passive cooling. Use Value: Eliminates need for heatsinks or forced air cooling in compact, fanless gateway designs operating up to 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8614EUDC#PBF | Same silicon, rated for 0°C to 125°C junction (not guaranteed over full –40°C to 125°C range) | Not qualified for automotive cold-temperature startup; unsuitable for engine bay or exterior modules | Select LT8614IUDC#PBF for guaranteed –40°C operation in automotive or industrial environments requiring extended temperature validation. |
| LT8614HUDC#PBF | Same silicon, rated for –40°C to 150°C junction temperature with full parametric guarantee | Required for under-hood applications exceeding 125°C ambient (e.g., near exhaust, turbocharger) | Choose LT8614HUDC#PBF only when ambient exceeds 105°C and full 150°C junction rating is mandated by system thermal analysis. |
Compared with LT8614EUDC#PBF, the LT8614IUDC#PBF guarantees full –40°C to 125°C operation with validated parameters, while LT8614HUDC#PBF extends the upper limit to 150°C - all share identical electrical specs, pinout, and layout, enabling drop-in replacement where temperature grade permits.
Availability
LT8614IUDC#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply with AEC-Q100 compliance and long-term production support.
Supply support for LT8614IUDC#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8614 product line delivers high-efficiency, low-EMI synchronous buck regulators optimized for automotive and industrial applications demanding reliability, small size, and ultralow quiescent current.
FAQ
What is the guaranteed operating temperature range for the LT8614IUDC#PBF?
The LT8614IUDC#PBF is guaranteed to meet all electrical specifications over the full –40°C to 125°C junction temperature range. This includes parametric validation across temperature, not just design assurance - making it suitable for automotive cabin and chassis applications where cold-start and thermal cycling are critical.
How does the LT8614IUDC#PBF achieve 2.5µA quiescent current while maintaining regulation?
The LT8614IUDC#PBF achieves 2.5µA IQ in regulation using Burst Mode® operation: it delivers brief energy pulses to the output capacitor, then enters deep sleep where most internal circuitry is disabled. The 0.97V feedback reference and precision enable threshold ensure stable regulation even at microamp loads - verified across –40°C to 125°C.
Can the LT8614IUDC#PBF be synchronized to an external clock, and what happens to frequency foldback?
Yes, the LT8614IUDC#PBF supports external clock synchronization via the SYNC/MODE pin. When driven by an external clock or held DC high, frequency foldback (which reduces switching frequency during low-VOUT conditions) is disabled - ensuring consistent timing for systems requiring deterministic switching behavior during start-up or overload.
What is the purpose of the dual VIN and GND pins (VIN1/VIN2, GND1/GND2) on the LT8614IUDC#PBF?
The dual VIN and GND pins on the LT8614IUDC#PBF create separate, low-inductance paths for high-di/dt input currents - a core part of Silent Switcher® architecture. VIN1/GND1 and VIN2/GND2 each carry half the input ripple current, minimizing magnetic field coupling and enabling ultra-low EMI without external filters in standard PCB layouts.
Is the LT8614IUDC#PBF pin-compatible with other members of the LT861x family?
Yes, the LT8614IUDC#PBF shares identical pinout, package (18-lead 3mm × 4mm QFN), and footprint with LT8614EUDC#PBF, LT8614HUDC#PBF, and LT8614MPUDC#PBF. All variants use the same LGGQ marking and UDC package - enabling direct substitution based on temperature grade without PCB redesign.
LT8614IUDC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN, 18 Leads, 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):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 4A
- Frequency - Switching:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LT8614IUDC#PBF FAQ
1.How can I place an order for LT8614IUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8614IUDC#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 LT8614IUDC#PBF reliable?
The price and inventory of LT8614IUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8614IUDC#PBF is usually 5 days.
3.What payment methods are accepted for LT8614IUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8614IUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8614IUDC#PBF?
LT8614IUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8614IUDC#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 LT8614IUDC#PBF?
For technical support, including LT8614IUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8614IUDC#PBF requirements.
6.How does Aetrix verify that LT8614IUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LT8614IUDC#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 LT8614IUDC#PBF meets industry standards.
7.What is the process for return or replacement of LT8614IUDC#PBF?
All LT8614IUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8614IUDC#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 LT8614IUDC#PBF part is unused and in its original packaging.
Return procedure for LT8614IUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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