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Analog Devices Inc. LT8614HUDC#TRPBF
- Part No.:
- LT8614HUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN, 18 Leads, Exposed Pad
- Datasheet:
-
LT8614HUDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:692
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Product details
Overview
LT8614HUDC#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 ±9% power-good threshold accuracy. It is AEC-Q100 qualified for automotive power supplies requiring low EMI and high light-load efficiency.
For engineers reviewing the LT8614HUDC#TRPBF datasheet, LT8614HUDC#TRPBF pinout, LT8614HUDC#TRPBF application, or LT8614HUDC#TRPBF equivalent, key selection criteria include its ultralow IQ in Burst Mode, 3.4V–42V input range, integrated power switches, internal compensation, and thermal grade up to 150°C junction temperature.
Technical Context
The LT8614HUDC#TRPBF employs peak current mode control with Silent Switcher architecture to suppress radiated EMI-verified per CISPR 25 Class 5 limits-even at 2MHz switching. Its dual-input VIN1/VIN2 and dual-ground GND1/GND2 pins enable optimized high-current loop routing, while internal 0.97V reference and ±9% PG window support precise output regulation across temperature.
It integrates top/bottom NMOS switches (85mΩ/40mΩ), supports frequency programming (200kHz–3MHz) via RT resistor, and includes synchronized Burst Mode operation (2.5µA IQ), soft-start/tracking via TR/SS, and robust overload protection-including safe operation with saturated inductors and frequency foldback during start-up or overcurrent.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients and industrial DC rails without external pre-regulation. |
| Output Current | 4A continuous - enables single-chip 5V/4A or 3.3V/4A conversion for ECUs, ADAS cameras, and infotainment modules. |
| Quiescent Current | 2.5µA in regulation - sustains >10-year battery life in always-on automotive modules (e.g., telematics, alarm systems). |
| Switching Frequency | 200kHz to 3MHz - programmable via RT pin; allows compact magnetics and noise avoidance in sensitive RF bands. |
| Min. On-Time | 30ns - enables high VIN-to-low VOUT conversion (e.g., 36V→3.3V) at 2MHz without pulse skipping. |
| Power-Good Accuracy | ±9% of FB voltage - provides reliable system reset signaling under line/load transients and thermal stress. |
| Junction Temp Range | –40°C to +150°C - H-grade qualification ensures operation in engine bay or under-hood environments. |
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 PCB SW trace for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Reduces IQ by sourcing INTVCC from VOUT ≥3.3V; bypass with 1µF if externally powered. |
| INTVCC (2) | Internal 3.4V supply rail | Powers gate drivers and control logic; requires ≥1µF local ceramic decoupling to GND. |
| BST (3) | Bootstrap capacitor node | Drives top switch gate above VIN; requires 0.1µF ceramic capacitor placed adjacent to IC. |
| VIN1 (4), VIN2 (13) | Dual input power inputs | Split inputs reduce high-frequency input loop area; each requires dedicated 1µF bypass to respective GND1/GND2. |
| GND1 (6,7), GND2 (10,11) | Power switch return paths | Separate ground returns isolate high di/dt paths; must be tied together and connected to solid ground plane. |
| SW (8,9,21,22) | Switch node outputs | Connects to inductor and BST cap; exposed pads (21,22) are SW and must be soldered to PCB SW copper. |
| EN/UV (14) | Enable and input UVLO input | Hysteretic 1.00V rising / 0.96V falling threshold; supports programmable input undervoltage lockout. |
| RT (15) | Frequency programming | Resistor to GND sets fSW from 200kHz to 3MHz; tolerance directly impacts switching frequency accuracy. |
| TR/SS (16) | Soft-start and tracking | 2.2µA internal pull-up enables capacitor-programmed ramp rate; supports output voltage sequencing. |
| SYNC/MODE (17) | Mode selection and sync input | Ground = Burst Mode; DC ≥3V = pulse-skipping; external clock = synchronization; floating prohibited. |
| GND (18) | System ground reference | Signal ground connection point; must tie to main ground plane and GND1/GND2. |
| PG (19) | Open-drain power-good flag | Asserts high when FB is within ±9% of 0.97V and no fault; valid only when VIN >3.4V. |
| FB (20) | Feedback input | Regulates to 0.970V; requires resistive divider and 4.7–22pF phase-lead capacitor to VOUT for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Minimizes radiated EMI emissions to meet CISPR 25 Class 5 limits without shielding or ferrites-critical for automotive EMC compliance. |
| Ultralow Quiescent Current | 2.5µA IQ in regulation enables >10-year battery standby in always-on vehicle modules without compromising startup time or transient response. |
| Fast Minimum On-Time | 30ns enables high step-down ratios (e.g., 36V→3.3V) at 2MHz, reducing inductor size and enabling compact, high-density power designs. |
| Integrated Power Switches | Monolithic 85mΩ top / 40mΩ bottom NMOS eliminates external MOSFETs and gate drivers-reducing BOM count and layout complexity. |
| AEC-Q100 Qualified (H Grade) | Qualified for operation from –40°C to +150°C junction temperature-validated for under-hood and transmission-control applications. |
Applications
| Automotive ADAS Camera Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers 3.3V image sensor and ISP in forward-facing camera module exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary 36V→3.3V/2A DC/DC converter with Burst Mode for parking-mode operation and fast load transient response during frame capture. Use Value: 2.5µA IQ extends vehicle battery life during weeks-long parked surveillance; 150°C rating ensures reliability at 125°C ambient. | Use Scenario: Supplies isolated 5V logic rails and analog front-end in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Main 24V→5V/4A step-down regulator powering microcontroller, CAN transceiver, and ADC reference. Use Value: 42V max input withstands 36V industrial surges; 96% efficiency at full load reduces thermal derating and enclosure cooling requirements. |
| GSM Base Station RF Power Amplifier Bias | Medical Portable Infusion Pump |
Use Scenario: Generates stable 5V bias for GaN RF power amplifier stages in small-cell base stations with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise, low-EMI 48V→5V/3A supply operating at 2.2MHz to avoid LTE band interference. Use Value: Silent Switcher architecture achieves >30dB lower radiated emissions vs conventional buck converters-eliminating need for EMI filters. | Use Scenario: Powers motor driver, MCU, and display in battery-operated infusion pump requiring FDA-compliant low-power design. IC Role / Device Role / Timing Role: Primary 12V→3.3V/1A converter with soft-start and PG monitoring for safety-critical power sequencing. Use Value: ±9% PG accuracy ensures deterministic system reset during battery voltage sag; 30ns min on-time supports wide input range as Li-ion discharges. |
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#TRPBF | Same silicon, rated for –40°C to +125°C junction temperature; lower thermal grade than H-grade. | Not qualified for under-hood or high-ambient industrial use; suitable for cabin electronics or lab equipment. | Select when ambient temperature remains ≤85°C and AEC-Q100 H-grade qualification is not required. |
| LT8614IUDC#TRPBF | Same silicon, guaranteed performance over –40°C to +125°C; tighter parametric specs than E-grade but lower max TJ than H-grade. | Targeted at industrial automation where extended temp validation is needed but 150°C is unnecessary. | Choose for cost-sensitive industrial applications needing full-temp-range guarantee without automotive qualification. |
Compared with LT8614EUDC#TRPBF and LT8614IUDC#TRPBF, the LT8614HUDC#TRPBF uniquely supports 150°C junction operation and AEC-Q100 H-grade compliance-making it the only option for engine compartment power delivery where sustained 125°C ambient is expected.
Availability
LT8614HUDC#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS systems, industrial PLCs, and medical portable devices requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for LT8614HUDC#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8614HUDC#TRPBF belongs to the Silent Switcher® step-down regulator product line, engineered specifically for ultra-low EMI and ultralow quiescent current in space-constrained, thermally demanding automotive and industrial power systems.
FAQ
What is the maximum junction temperature rating for LT8614HUDC#TRPBF?
The LT8614HUDC#TRPBF is rated for operation from –40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive H-grade applications. This makes LT8614HUDC#TRPBF suitable for under-hood environments where ambient temperatures exceed 105°C and thermal derating margins must be preserved. The device includes overtemperature protection that activates above 150°C.
How does LT8614HUDC#TRPBF achieve 2.5µA quiescent current in regulation?
LT8614HUDC#TRPBF achieves 2.5µA IQ through optimized Burst Mode® operation: during light loads, it delivers discrete energy pulses to the output capacitor and enters deep sleep between bursts, shutting down all switching and control circuitry except essential bias functions. This behavior is confirmed in the datasheet's Typical Performance Characteristics (Figure G03–G04) and applies specifically to LT8614HUDC#TRPBF when configured with SYNC grounded and proper feedback divider sizing.
Can LT8614HUDC#TRPBF synchronize to an external clock source?
Yes, LT8614HUDC#TRPBF supports external clock synchronization via the SYNC/MODE pin (pin 17). When driven with a clean CMOS clock signal between 200kHz and 3MHz, LT8614HUDC#TRPBF locks its internal oscillator and operates in pulse-skipping mode with aligned switching edges-enabling noise spectral shaping and multi-rail synchronization in complex power systems.
What is the purpose of the dual VIN and dual GND pins on LT8614HUDC#TRPBF?
The dual VIN (VIN1, VIN2) and dual GND (GND1, GND2) pins on LT8614HUDC#TRPBF physically separate high-di/dt input current paths to minimize parasitic inductance and EMI. Each VIN pair connects to its own 1µF bypass capacitor referenced to its dedicated GND pair, enabling tightly coupled, low-inductance loops critical for Silent Switcher performance-verified in LT8614 demo board layouts and EMI test reports.
Does LT8614HUDC#TRPBF require external compensation components?
No, LT8614HUDC#TRPBF features internal compensation and requires no external compensation network. Its error amplifier, slope compensation, and VC node control are fully integrated-confirmed in the Block Diagram (page 10) and Applications Information section. Users only need to connect the FB resistive divider and optional phase-lead capacitor (4.7–22pF) from FB to VOUT for stability across all operating conditions.
LT8614HUDC#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LT8614HUDC#TRPBF FAQ
1.How can I place an order for LT8614HUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8614HUDC#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 LT8614HUDC#TRPBF reliable?
The price and inventory of LT8614HUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8614HUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8614HUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8614HUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8614HUDC#TRPBF?
LT8614HUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8614HUDC#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 LT8614HUDC#TRPBF?
For technical support, including LT8614HUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8614HUDC#TRPBF requirements.
6.How does Aetrix verify that LT8614HUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8614HUDC#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 LT8614HUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8614HUDC#TRPBF?
All LT8614HUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8614HUDC#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 LT8614HUDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8614HUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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