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Analog Devices Inc. LT8614HUDC#PBF
- Part No.:
- LT8614HUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN, 18 Leads, Exposed Pad
- Datasheet:
-
LT8614HUDC#PBF.pdf
- Description:
- IC REG BUCK ADJ 4A 20QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT8614HUDC#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 18-lead 3mm × 4mm QFN package. It delivers up to 96% efficiency at 1MHz (12VIN→5VOUT) and supports automotive-grade operation from –40°C to 150°C junction temperature.
For engineers reviewing the LT8614HUDC#PBF datasheet, LT8614HUDC#PBF pinout, LT8614HUDC#PBF application, or LT8614HUDC#PBF equivalent, key selection considerations include ultralow EMI performance per CISPR 25 Class 5, Burst Mode® operation for microamp-level light-load efficiency, fast transient response with <10mVP-P ripple, and AEC-Q100 qualification for automotive power supplies.
Technical Context
The LT8614HUDC#PBF employs peak current mode control with internal compensation and Silent Switcher® architecture-using dual input paths (VIN1/VIN2), split ground pins (GND1/GND2), and optimized SW/BST node layout-to suppress high-frequency EMI without external filters. Its oscillator supports 200kHz–3MHz programmable switching frequency via RT pin resistor.
It integrates top/bottom NMOS power switches (85mΩ/40mΩ typical RDS(on)), features accurate 0.970V feedback reference with ±0.6% initial tolerance, and includes built-in protection: overtemperature shutdown, frequency foldback during low-VOUT conditions, and safe operation under inductor saturation with 5.7–10A top-switch current limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - enables direct battery-fed operation in 12V/24V/36V automotive and industrial systems. |
| Output Current | 4A continuous - supports high-power digital loads including microcontrollers, FPGAs, and sensor hubs without external boost stages. |
| IQ in Regulation | 2.5µA at 12VIN→3.3VOUT - extends battery life in always-on telematics and ADAS modules. |
| Min. On-Time | 30ns - allows high-frequency, high-step-down ratio conversion (e.g., 42V→3.3V at 2MHz) without pulse skipping. |
| EMI Performance | CISPR 25 Class 5 compliant - meets stringent automotive radiated emission limits without ferrite beads or shielding cans. |
| Junction Temp Range | –40°C to 150°C - qualified per AEC-Q100 Grade H for under-hood and engine-control applications. |
| Feedback Reference | 0.970V ±0.6% - enables precise output voltage setting with minimal resistor divider error contribution. |
Pinout & Package
Package: 18-lead (3mm × 4mm) plastic QFN with exposed SW pads (pins 21, 22); thermal pad must be soldered to PCB SW trace for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Reduces VIN current draw when tied to VOUT ≥3.3V; enables >94% efficiency at 2MHz by powering INTVCC from BIAS instead of VIN. |
| INTVCC (2) | Internal 3.4V regulator output | Supplies gate drivers and control logic; requires ≥1µF local ceramic decoupling to maintain stability under load transients. |
| BST (3) | Bootstrap capacitor connection | Drives top NMOS gate above VIN; requires 0.1µF X7R ceramic placed adjacent to pin for reliable high-side switching. |
| VIN1 (4), VIN2 (13) | Dual input power inputs | Split VIN paths minimize high-di/dt loop area; each requires dedicated 1µF 0603 bypass cap to GND1/GND2 for EMI suppression. |
| GND1 (6,7), GND2 (10,11) | Power switch return paths | Separate ground returns isolate high-current switching paths; must be tied together and connected to solid ground plane with multiple vias. |
| SW (8,9,21,22) | Switch node outputs | Connects to inductor and BST cap; exposed pads (21,22) are electrically SW and must be soldered to SW copper for thermal conduction. |
| EN/UV (14) | Enable and input undervoltage lockout | Hysteretic 1.00V rising / 0.96V falling threshold; supports programmable VIN UVLO using external resistor divider. |
| RT (15) | Frequency programming | Resistor to GND sets fSW from 200kHz to 3MHz; 60.4kΩ yields ~700kHz, 221kΩ yields ~210kHz, 18.2kΩ yields ~2.0MHz. |
| TR/SS (16) | Soft-start and tracking | 2.2µA internal current source enables capacitor-programmed VOUT ramp rate; also accepts external voltage for output tracking. |
| SYNC/MODE (17) | Mode selection and clock sync | Ground = Burst Mode; DC ≥3V = pulse-skipping; external clock = synchronized operation with aligned SW edges. |
| GND (18) | System ground reference | Signal ground for FB, PG, and logic; must connect to main ground plane but kept separate from power ground until star point. |
| PG (19) | Power good indicator | Open-drain output asserts high when FB is within ±9% of 0.970V and no fault exists; valid only when VIN >3.4V. |
| FB (20) | Feedback input | Regulated to 0.970V; requires RC network (e.g., 4.7pF + resistor divider) for phase compensation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Dual input/ground paths and balanced SW layout reduce radiated EMI by >30dB vs conventional buck regulators, eliminating need for EMI filters in space-constrained automotive modules. |
| Ultralow Quiescent Current | 2.5µA IQ in regulation enables >10-year battery life in always-on vehicle event recorders and tire pressure sensors. |
| Fast Minimum On-Time | 30ns on-time supports 42V→3.3V conversion at 2MHz, enabling compact 2.2µH inductors and reducing solution size by 40% vs 500kHz designs. |
| Integrated Compensation | No external compensation components required - simplifies design validation and reduces BOM count for production-grade automotive power rails. |
| AEC-Q100 Grade H Qualification | Validated for –40°C to 150°C operation with lifetime testing per automotive reliability standards - suitable for engine control units and transmission control modules. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powering SoC, DDR memory, and display interfaces in head-unit systems with 12V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V/3.3V/1.8V step-down regulator delivering clean, low-noise power with Burst Mode for standby states. Use Value: Meets CISPR 25 Class 5 radiated emissions without shielding, reducing system cost and board area by 25% vs filtered alternatives. | Use Scenario: Supplying image sensor, ISP, and SerDes in rear-view and surround-view cameras mounted near engine compartments. IC Role / Device Role / Timing Role: High-reliability 3.3V/1.2V regulator operating continuously at 125°C ambient with thermal derating margin. Use Value: Sustains full 4A output at 150°C junction temperature, eliminating need for external thermal monitoring or derating firmware. |
| Industrial PLC I/O Module | GSM Base Station RF Power Supply |
Use Scenario: Providing isolated 5V logic rail and 24V field-side power in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Input-stage buck converter accepting wide-range 18–42V DC input from industrial power supplies. Use Value: Maintains regulation down to 3.4V input, enabling seamless hold-up during brownouts and supporting 24V AC/DC rectified inputs. | Use Scenario: Generating stable 5V/3.3V rails for GSM transceiver ICs and PA bias in remote radio heads with limited airflow. IC Role / Device Role / Timing Role: High-efficiency, low-ripple DC/DC stage minimizing thermal load in sealed outdoor enclosures. Use Value: Delivers 94% efficiency at 2MHz (12VIN→5VOUT), reducing heat generation by 35% vs 500kHz solutions and extending fanless operation. |
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 –40°C to 125°C junction temperature; lower max temp grade. | Not qualified for under-hood automotive use; suitable for cabin electronics and industrial controls. | Select when ambient temperature stays below 105°C and AEC-Q100 Grade H is not required. |
| LT8640SUDC#PBF | Higher 6A output, 40V max input, same 2.5µA IQ, but uses different pinout and requires updated layout. | Supports higher current loads (e.g., radar processors); not drop-in compatible due to different EN/UV and SYNC pin locations. | Choose when future-proofing for >4A loads or needing extended input range beyond 42V. |
Compared with LT8614EUDC#PBF, the LT8614HUDC#PBF adds 25°C higher junction rating and full AEC-Q100 Grade H compliance for engine-bay deployment; versus LT8640SUDC#PBF, it offers identical EMI performance and quiescent current in a smaller footprint but with lower current capability.
Availability
LT8614HUDC#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial PLC I/O requiring stable component supply with long-term lifecycle assurance.
Supply support for LT8614HUDC#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 LT8614HUDC#PBF belongs to the Silent Switcher® step-down regulator product line, engineered specifically for ultra-low EMI and ultralow quiescent current in automotive and harsh-environment power applications.
FAQ
What is the maximum allowable input voltage for the LT8614HUDC#PBF?
The LT8614HUDC#PBF has an absolute maximum input voltage rating of 42V across VIN1 and VIN2 pins. Operation is specified from 3.4V to 42V, making it suitable for 12V, 24V, and 36V automotive and industrial bus systems. Exceeding 42V may cause permanent damage per Absolute Maximum Ratings table.
Does the LT8614HUDC#PBF require external compensation components?
No, the LT8614HUDC#PBF features internal compensation and operates stably with standard output capacitor types (e.g., 47µF ceramic or polymer). No external Type II or Type III compensation network is needed, simplifying design and reducing bill-of-materials count for production-grade automotive power supplies.
How does the LT8614HUDC#PBF achieve CISPR 25 Class 5 EMI compliance?
The LT8614HUDC#PBF achieves CISPR 25 Class 5 compliance through its Silent Switcher® architecture: symmetrical dual-input/ground paths, minimized high-di/dt loop area, integrated bootstrap capacitor routing, and optimized SW node layout. These features reduce magnetic field emissions by >30dB, enabling pass-fail results without external EMI filters in standard 2-layer demo boards.
Can the LT8614HUDC#PBF operate with a 2MHz switching frequency?
Yes, the LT8614HUDC#PBF supports 200kHz to 3MHz programmable switching frequency. Using an 18.2kΩ resistor from RT to GND sets fSW to approximately 2.0MHz, enabling compact magnetics and reduced output capacitance while maintaining >94% efficiency at 12VIN→5VOUT per Typical Performance Characteristics.
What is the function of the exposed SW pads (pins 21 and 22) on the LT8614HUDC#PBF?
The exposed SW pads (pins 21 and 22) on the LT8614HUDC#PBF are electrically connected to the internal switch node and serve as primary thermal conduction paths. They must be soldered directly to the PCB's SW copper pour to achieve θJA = 40°C/W; leaving them unconnected degrades thermal performance and risks thermal shutdown under sustained 4A load.
LT8614HUDC#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LT8614HUDC#PBF FAQ
1.How can I place an order for LT8614HUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8614HUDC#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 LT8614HUDC#PBF reliable?
The price and inventory of LT8614HUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8614HUDC#PBF is usually 5 days.
3.What payment methods are accepted for LT8614HUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8614HUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8614HUDC#PBF?
LT8614HUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8614HUDC#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 LT8614HUDC#PBF?
For technical support, including LT8614HUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8614HUDC#PBF requirements.
6.How does Aetrix verify that LT8614HUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LT8614HUDC#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 LT8614HUDC#PBF meets industry standards.
7.What is the process for return or replacement of LT8614HUDC#PBF?
All LT8614HUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8614HUDC#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 LT8614HUDC#PBF part is unused and in its original packaging.
Return procedure for LT8614HUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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