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Analog Devices Inc. LT8614MPUDC#TRPBF
- Part No.:
- LT8614MPUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN, 18 Leads, Exposed Pad
- Datasheet:
-
LT8614MPUDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,340
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Product details
Overview
LT8614MPUDC#TRPBF 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), supports input range 3.4V–42V, and features ultralow EMI emissions for automotive and industrial power supplies.
For engineers reviewing the LT8614MPUDC#TRPBF datasheet, LT8614MPUDC#TRPBF pinout, LT8614MPUDC#TRPBF application, or LT8614MPUDC#TRPBF equivalent, key selection criteria include its AEC-Q100 qualified –55°C to 150°C junction temperature range, Burst Mode® operation for µA-level light-load efficiency, fast transient response with <10mVP-P ripple, and programmable 200kHz–3MHz switching frequency via RT pin.
Technical Context
The LT8614MPUDC#TRPBF employs peak current mode control with internal compensation and Silent Switcher® architecture-using dual input paths (VIN1/VIN2) and symmetric SW node layout-to suppress common-mode EMI. Its 30ns minimum top-switch on-time enables high VIN-to-low VOUT conversion at up to 3MHz without pulse skipping.
It integrates both high-side and low-side NMOS power switches (85mΩ/40mΩ typical RDS(on)), supports BIAS pin sourcing for improved light-load efficiency, and includes fault protection: overtemperature shutdown, frequency foldback during undervoltage, and PG monitoring with ±9% output regulation window.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients and industrial 24/36V rails. |
| Output Current | 4A continuous - sufficient for powering microcontrollers, FPGAs, and sensor subsystems. |
| Quiescent Current | 2.5µA in regulation - enables >10-year battery life in always-on automotive modules. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows compact magnetics and avoids AM band interference. |
| Feedback Reference | 0.970V ±0.006V - enables precise output voltage setting with minimal resistor divider error. |
| Min On-Time | 30ns - permits 12V→1.2V conversion at 2MHz without duty-cycle limitation. |
| EMI Performance | CISPR 25 Class 5 compliant - meets stringent automotive radiated emission limits without external filters. |
Pinout & Package
LT8614MPUDC#TRPBF is housed in an 18-lead 3mm × 4mm plastic QFN (UDC package) with exposed SW pads (pins 21, 22) requiring solder connection to PCB for thermal and electrical performance. The package is RoHS-compliant and moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Reduces IQ when tied to ≥3.1V (e.g., VOUT); bypass with 1µF capacitor if externally supplied. |
| INTVCC (2) | Internal 3.4V regulator output | Supplies gate drivers and control logic; decouple with ≥1µF ceramic capacitor to GND. |
| BST (3) | Bootstrap capacitor connection | Drives high-side NMOS gate; requires 0.1µF capacitor between BST and SW pins. |
| VIN1 (4), VIN2 (13) | Dual input power inputs | Split VIN paths minimize high-di/dt loop area; each requires dedicated 1µF local bypass. |
| GND1 (6,7), GND2 (10,11) | Power switch ground returns | Must be tied together and connected to low-impedance ground plane; critical for EMI control. |
| SW (8,9,21,22) | Switch node outputs | Connects to inductor and BST cap; exposed pads (21,22) must be soldered to SW trace for thermal relief. |
| EN/UV (14) | Enable and input UVLO input | Hysteretic threshold (0.94V↑ / 0.90V↓); resistor divider sets custom VIN shutdown point. |
| RT (15) | Frequency programming | Resistor to GND sets fSW from 200kHz to 3MHz; tolerance directly impacts switching accuracy. |
| TR/SS (16) | Soft-start and tracking | 2.2µA internal pull-up enables capacitor-based ramp rate control; also accepts external tracking voltage. |
| SYNC/MODE (17) | Mode selection and sync input | Ground = Burst Mode; ≥3V DC = pulse-skipping; external clock = synchronized operation. |
| GND (18) | System ground reference | Connect to system ground plane; separate from GND1/GND2 but tied at single point. |
| PG (19) | Power good open-drain output | Asserts high when FB is within ±9% of 0.97V and no faults; valid above 3.4V VIN. |
| FB (20) | Feedback input | Regulated to 0.970V; connect resistor divider tap and 4.7–22pF phase-lead capacitor to VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Dual-input, symmetric SW layout reduces magnetic field coupling and meets CISPR 25 Class 5 without shielding. |
| Ultralow quiescent current | 2.5µA IQ in regulation enables >10-year battery runtime in always-on telematics and ADAS modules. |
| Fast minimum on-time | 30ns enables high-frequency, high-step-down ratio designs (e.g., 24V→3.3V @ 2MHz) without pulse skipping. |
| Integrated power switches | 85mΩ/40mΩ RDS(on) top/bottom NMOS deliver 4A with minimal external components and footprint. |
| AEC-Q100 qualification | Rated for –55°C to +150°C junction temperature - validated for under-hood automotive applications. |
| Robust protection suite | Includes overtemperature shutdown, frequency foldback during start-up/overload, and PG fault signaling. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
|
Use Scenario: Powering SoC, display controller, and audio codec in head-unit systems with cold-crank (4.5V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck converter delivering regulated rail with <10mVP-P ripple and fast transient recovery during CPU burst loads. Use Value: Silent Switcher® EMI suppression eliminates need for ferrite beads or metal shields, reducing BOM cost and board area by >30%. |
Use Scenario: Generating isolated 5V and 3.3V rails for digital I/O, analog front-end, and communication interfaces in modular PLC backplanes. IC Role / Device Role / Timing Role: High-efficiency, wide-input DC/DC regulator supporting 12–36V industrial bus with stable output across temperature and line variation. Use Value: 2.5µA quiescent current extends backup battery life during mains failure; AEC-Q100 qualification ensures long-term reliability in harsh environments. |
| GSM Base Station RF Power Amplifier Bias | Medical Portable Diagnostic Imaging |
|
Use Scenario: Providing clean, low-noise 5V bias to GaN RF power amplifiers in small-cell base stations where spectral purity is critical. IC Role / Device Role / Timing Role: Low-EMI step-down regulator operating at 2.1MHz to avoid interference with LTE bands while maintaining tight output regulation. Use Value: Radiated emissions <10dB below CISPR 25 Class 5 limit at 100MHz–1GHz enable direct integration near sensitive RF sections. |
Use Scenario: Powering FPGA, ADC, and image sensor in handheld ultrasound or X-ray detectors requiring ultra-low noise and long battery life. IC Role / Device Role / Timing Role: Primary 3.3V/1.2V supply with soft-start and tracking to coordinate multi-rail sequencing during wake-up from standby. Use Value: 30ns min on-time supports 12V→1.2V conversion at 2MHz, enabling compact 2-layer PCB design with minimal filtering. |
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 |
|---|---|---|---|
| LT8640S-1#TRPBF | Same Silent Switcher architecture, 42V/8A, 2.5µA IQ, but 20-lead 4mm × 4mm LQFN package and higher current rating. | Supports higher output current and includes spread-spectrum modulation for further EMI reduction. | Select when >4A output or enhanced EMI margin is required; not pin-compatible due to larger package and extra pins. |
| TPS54560QPWPRQ1 | 42V/5A automotive buck, 145µA IQ, 100ns min on-time, SOIC-8 package; lacks Silent Switcher EMI suppression. | Lower cost, simpler layout, but requires external EMI filters to meet CISPR 25 Class 5. | Select for cost-sensitive non-critical EMI applications where board space and filter components are acceptable trade-offs. |
Compared with LT8614MPUDC#TRPBF, LT8640S-1#TRPBF offers double current capacity and spread-spectrum capability at the expense of larger footprint and non-interchangeable pinout, while TPS54560QPWPRQ1 provides lower BOM cost but demands additional EMI mitigation effort and sacrifices >10× light-load efficiency.
Availability
LT8614MPUDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power, GSM RF bias, and portable medical imaging applications requiring stable component supply, extended temperature operation, and certified EMI compliance.
Supply support for LT8614MPUDC#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 with precision power, sensing, and signal chain solutions.
The LT8614MPUDC#TRPBF belongs to Analog Devices' Silent Switcher® DC/DC regulator family, engineered specifically for automotive and industrial applications demanding ultralow EMI, high efficiency across load range, and robust operation across extreme temperatures.
FAQ
What is the maximum junction temperature rating for the LT8614MPUDC#TRPBF?
The LT8614MPUDC#TRPBF is rated for a maximum junction temperature of +150°C and operates over a guaranteed range of –55°C to +150°C. This AEC-Q100 MP-grade qualification makes it suitable for under-hood automotive applications where ambient temperatures exceed 125°C. Derating curves in the datasheet specify safe operating area based on thermal resistance and PCB copper area.
Does the LT8614MPUDC#TRPBF support synchronization to an external clock?
Yes, the LT8614MPUDC#TRPBF supports external clock synchronization via the SYNC/MODE pin (pin 17). When driven with a logic-level clock signal (200kHz–3MHz), the device synchronizes its switching edges and operates in pulse-skipping mode. This feature enables deterministic EMI placement and eliminates beat frequencies in multi-regulator systems.
How does the LT8614MPUDC#TRPBF achieve ultralow 2.5µA quiescent current?
The LT8614MPUDC#TRPBF achieves 2.5µA quiescent current through optimized Burst Mode® operation: during light loads, it delivers discrete energy packets to the output capacitor and enters deep sleep between bursts, disabling most internal circuitry. The BIAS pin further reduces IQ by sourcing INTVCC from VOUT instead of VIN when VOUT ≥ 3.3V.
Can the LT8614MPUDC#TRPBF operate with a 3.0V input voltage?
No, the LT8614MPUDC#TRPBF has a minimum input voltage of 3.4V per absolute maximum ratings and electrical specifications. Operation below 3.4V may result in UVLO activation or unstable regulation. For sub-3.4V applications, consider the LT8610 or LT8609S, which support down to 2.8V and 2.5V respectively.
What is the purpose of the dual VIN pins (VIN1 and VIN2) on the LT8614MPUDC#TRPBF?
The dual VIN pins (VIN1 and VIN2) on the LT8614MPUDC#TRPBF implement Silent Switcher® architecture by splitting the high-di/dt input current path into two symmetrical loops. This minimizes net magnetic field radiation and enables ultra-low EMI performance without external filters. Each pin requires its own 1µF local bypass capacitor placed adjacent to its respective GND pin.
LT8614MPUDC#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:
- Obsolete
- 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:
- No
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LT8614MPUDC#TRPBF FAQ
1.How can I place an order for LT8614MPUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8614MPUDC#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 LT8614MPUDC#TRPBF reliable?
The price and inventory of LT8614MPUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8614MPUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8614MPUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8614MPUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8614MPUDC#TRPBF?
LT8614MPUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8614MPUDC#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 LT8614MPUDC#TRPBF?
For technical support, including LT8614MPUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8614MPUDC#TRPBF requirements.
6.How does Aetrix verify that LT8614MPUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8614MPUDC#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 LT8614MPUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8614MPUDC#TRPBF?
All LT8614MPUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8614MPUDC#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 LT8614MPUDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8614MPUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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