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Analog Devices Inc. LT8614EUDC#TRPBF
- Part No.:
- LT8614EUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN, 18 Leads, Exposed Pad
- Datasheet:
-
LT8614EUDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 20QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT8614EUDC#TRPBF from Analog Devices is a 42V, 4A synchronous step-down Silent Switcher regulator in a 18-lead 3mm × 4mm QFN package. It delivers up to 96% efficiency at 1MHz (12VIN→5VOUT), features 2.5µA quiescent current in regulation, 30ns minimum on-time, and ultralow EMI emissions-enabling high-density automotive power supplies with strict EMC requirements.
For engineers reviewing the LT8614EUDC#TRPBF datasheet, LT8614EUDC#TRPBF pinout, LT8614EUDC#TRPBF application, or LT8614EUDC#TRPBF equivalent, key selection criteria include input voltage range (3.4V–42V), Burst Mode® quiescent current (2.5µA), peak current mode control, internal compensation, and AEC-Q100 qualification for automotive grade operation.
Technical Context
The LT8614EUDC#TRPBF employs peak current mode control with an internal 0.970V reference and programmable oscillator (200kHz–3MHz via RT resistor). Its Silent Switcher® architecture uses symmetrical layout and integrated power switches to suppress common-mode EMI without external shielding.
It supports three operating modes: Burst Mode® (ultralow IQ, open-drain PG signaling regulation status), pulse-skipping (via SYNC/MODE ≥3V), and external clock synchronization (SYNC pin). The device tolerates inductor saturation safely and maintains regulation down to 125mV dropout at 1A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients including cold-crank (≥4.5V) and load-dump (≤42V). |
| Output Current | 4A continuous - enables single-chip 5V/4A or 3.3V/4A supplies for ADAS ECUs and infotainment modules. |
| Quiescent Current | 2.5µA in regulation - sustains >10-year battery life in always-on vehicle subsystems (e.g., telematics wake-up circuits). |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows optimization for size (high-freq) or efficiency (low-freq) without changing magnetics. |
| Min On-Time | 30ns - enables high VIN-to-low VOUT conversion (e.g., 42V→3.3V) at 2MHz without pulse skipping. |
| Feedback Reference | 0.970V ±0.6% - enables precise output setting with standard resistor dividers; line regulation <0.02%/V ensures stability across battery range. |
| EMI Performance | CISPR 25 Class 5 compliant - meets automotive radiated emission limits without ferrite beads or metal shields in typical layouts. |
Pinout & Package
Package: 18-lead (3mm × 4mm) plastic QFN with exposed SW pads (pins 21, 22); θJA = 40°C/W, θJC(PAD) = 12°C/W. Exposed pads must be soldered to SW trace for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Reduces IQ when tied to VOUT ≥3.3V; bypass with 1µF ceramic if sourced externally. |
| INTVCC (2) | Internal 3.4V regulator output | Power source for gate drivers and logic; decouple with ≥1µF low-ESR ceramic to GND. |
| BST (3) | Bootstrap capacitor connection | Drives top NMOS gate above VIN; requires 0.1µF ceramic placed adjacent to pin. |
| 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. |
| GND1/GND2 (6,7,10,11) | Power switch return paths | Four dedicated ground pins minimize RDS(on) loss and EMI; must be tied together and connected to solid ground plane. |
| SW (8,9,21,22) | Switch node outputs | Internal power switch outputs; exposed pads (21,22) are electrically SW and must be soldered to PCB SW copper. |
| EN/UV (14) | Enable and undervoltage lockout | Hysteretic threshold (0.94V↑ / 0.90V↓) enables programmable VIN brownout protection using resistor divider. |
| RT (15) | Oscillator frequency programming | Resistor to GND sets fSW from 200kHz to 3MHz; tolerance directly impacts switching frequency accuracy. |
| TR/SS (16) | Soft-start and tracking control | 2.2µA internal pull-up enables capacitor-programmed slew rate; supports output voltage tracking during power sequencing. |
| SYNC/MODE (17) | Mode selection and sync input | GND = Burst Mode; ≥3V = pulse-skipping; external clock = synchronized operation with aligned edges. |
| GND (18) | Signal ground reference | System ground connection point; must connect to main ground plane with low-inductance path. |
| PG (19) | Power good open-drain output | Asserts high when FB is within ±9% of 0.970V and no fault; requires external pull-up for logic-level signaling. |
| FB (20) | Feedback voltage sense | Regulates to 0.970V; connects to resistor divider tap; 4.7pF–22pF phase-lead cap improves stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Integrated dual-input/dual-GND layout and balanced SW nodes reduce radiated EMI by >30dB vs conventional buck regulators. |
| Ultralow Quiescent Current | 2.5µA IQ in regulation enables >10-year shelf life in battery-backed automotive modules without compromising startup behavior. |
| Fast Minimum On-Time | 30ns on-time supports direct 42V→3.3V conversion at 2MHz, eliminating need for cascaded regulators in high-voltage systems. |
| AEC-Q100 Qualified | Rated for –40°C to +125°C junction temperature (Grade E), with full characterization per automotive reliability standards. |
| Robust Overload Handling | Safely operates with saturated inductors; bottom FET current limit (4.5A–8.5A) and thermal shutdown prevent latch-up during sustained overload. |
Applications
| Automotive ADAS Camera Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 3.3V image sensor and ISP in rear-view camera module with 12V vehicle battery input subject to cold-crank (4.5V) and load-dump (42V) events. IC Role / Device Role / Timing Role: Primary 4A step-down regulator providing stable, low-noise 3.3V rail with fast transient response to sensor burst currents. Use Value: 2.5µA IQ extends battery backup runtime; Silent Switcher® compliance eliminates need for EMI filters, reducing BOM cost and board space. | Use Scenario: Generating 5V/4A isolated auxiliary supply for digital I/O channels in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter delivering regulated 5V from wide-range 24V industrial bus (18V–36V). Use Value: 94% efficiency at 2MHz reduces thermal stress in enclosed enclosures; AEC-Q100 qualification ensures long-term reliability in harsh environments. |
| GSM Base Station RF Power Amp | Medical Portable Monitor |
Use Scenario: Supplying 5V/4A bias to GaN RF power amplifier stages in small-cell base stations with strict EMI limits (CISPR 25 Class 5). IC Role / Device Role / Timing Role: Low-EMI, high-frequency buck converter replacing discrete solutions to meet radiated emission requirements without shielding. Use Value: Integrated Silent Switcher® design achieves pass-level emissions at 2MHz switching, enabling smaller heatsinks and compact RF front-end layout. | Use Scenario: Providing 3.3V/2A main system rail in battery-powered patient monitor with 10-year shelf-life requirement and zero-maintenance design. IC Role / Device Role / Timing Role: Primary battery-fed regulator operating in Burst Mode® to minimize self-discharge during standby. Use Value: 2.5µA IQ ensures <1% annual battery drain; internal soft-start prevents inrush current damage to Li-ion cells during cold start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8614HUDC#TRPBF | Higher junction temp rating (–40°C to +150°C); identical electrical specs and pinout. | Required for under-hood automotive applications exceeding 125°C ambient. | Select when operating junction temperature exceeds 125°C; otherwise LT8614EUDC#TRPBF is optimal for cabin/ECU use. |
| LT8640S-1#TRPBF | Same Silent Switcher® architecture, 42V/8A, but 20-lead 4mm × 4mm QFN; higher current, larger footprint. | Used where >4A output or enhanced thermal margin is needed; not pin-compatible. | Choose for higher current demand or improved thermal performance; requires PCB redesign due to different package and pin count. |
Compared with LT8614HUDC#TRPBF, the LT8614EUDC#TRPBF offers identical performance at lower cost and qualification level, while LT8640S-1#TRPBF provides double the current capacity in a larger package-making LT8614EUDC#TRPBF the optimal balance of size, efficiency, and automotive qualification for 4A applications.
Availability
LT8614EUDC#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial PLCs, and medical portable monitors requiring stable component supply with AEC-Q100 assurance and long-lifecycle support.
Supply support for LT8614EUDC#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 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 step-down regulators optimized for automotive and industrial applications demanding robustness, small size, and ultra-low quiescent current.
FAQ
What is the maximum input voltage rating for the LT8614EUDC#TRPBF?
The LT8614EUDC#TRPBF has an absolute maximum input voltage rating of 42V across VIN1, VIN2, and EN/UV pins. It operates continuously over 3.4V to 42V, making it suitable for 12V and 24V automotive systems with full load-dump immunity. Operation above 42V risks permanent damage per Absolute Maximum Ratings.
Does the LT8614EUDC#TRPBF require external compensation components?
No, the LT8614EUDC#TRPBF features internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces BOM count, and ensures stable operation across all supported output voltages and inductor values without tuning.
How does the LT8614EUDC#TRPBF achieve CISPR 25 Class 5 compliance?
The LT8614EUDC#TRPBF achieves CISPR 25 Class 5 compliance through its Silent Switcher® architecture: symmetrical SW node layout, integrated dual-VIN/dual-GND paths, and minimized high-di/dt loop area. When combined with recommended PCB layout (including split input caps and exposed SW pad soldering), it meets radiated emission limits without external filters or shielding.
Can the LT8614EUDC#TRPBF operate with a 3.3V output at 4A from a 42V input?
Yes, the LT8614EUDC#TRPBF supports 42V→3.3V conversion at 4A using its 30ns minimum on-time and peak current mode control. At 2MHz, this yields ~75% efficiency; efficiency improves at lower frequencies (e.g., 92% at 500kHz). Inductor selection and thermal management are critical for sustained 4A operation.
What is the function of the TR/SS pin on the LT8614EUDC#TRPBF?
On the LT8614EUDC#TRPBF, the TR/SS pin provides dual functionality: soft-start control (via internal 2.2µA pull-up charging an external capacitor) and output voltage tracking (by forcing FB to follow TR/SS voltage below 0.97V). It enables controlled power-up sequencing and multi-rail coordination in complex systems.
LT8614EUDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN, 18 Leads, 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):
- 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)
LT8614EUDC#TRPBF FAQ
1.How can I place an order for LT8614EUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8614EUDC#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 LT8614EUDC#TRPBF reliable?
The price and inventory of LT8614EUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8614EUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8614EUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8614EUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8614EUDC#TRPBF?
LT8614EUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8614EUDC#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 LT8614EUDC#TRPBF?
For technical support, including LT8614EUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8614EUDC#TRPBF requirements.
6.How does Aetrix verify that LT8614EUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8614EUDC#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 LT8614EUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8614EUDC#TRPBF?
All LT8614EUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8614EUDC#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 LT8614EUDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8614EUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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