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Analog Devices Inc. LT8648SJV#TRPBF
- Part No.:
- LT8648SJV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-TFQFN Exposed Pad
- Datasheet:
-
LT8648SJV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 15A 36LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,382
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Product details
Overview
LT8648SJV#TRPBF from Analog Devices is a 42V, 15A synchronous step-down Silent Switcher 2 regulator with AEC-Q100 qualification for automotive applications, 25ns minimum on-time, 200kHz–2.2MHz adjustable switching frequency, and integrated input/boost capacitors enabling ultralow EMI on any PCB. It delivers up to 95.5% efficiency at 1MHz (12VIN→5VOUT) and supports forced continuous, Burst Mode®, and spread-spectrum operation.
For engineers reviewing the LT8648SJV#TRPBF datasheet, LT8648SJV#TRPBF pinout, LT8648SJV#TRPBF application, or LT8648SJV#TRPBF equivalent, key selection criteria include thermal performance under 150°C junction temperature, EMI compliance in CISPR 25 Class 5 environments, output ripple <10mVP-P, VC-pin-based loop compensation for fast transient response, and compatibility with 7mm × 4mm LQFN exposed-back packaging.
Technical Context
The LT8648SJV#TRPBF implements peak current mode control with second-generation Silent Switcher 2 architecture, integrating ceramic bypass capacitors for VIN and BST to minimize high-di/dt loop area and suppress radiated EMI. Its internal 0.6V reference and error amplifier drive the VC pin to regulate peak switch current, supporting external RC compensation for bandwidth and phase margin tuning across 200kHz–2.2MHz.
It features four selectable operating modes via SYNC/MODE pin: Burst Mode® (low IQ = 100µA at 12VIN→5VOUT), forced continuous mode (FCM) for zero-current dead time and fast load transients, spread-spectrum modulation (±24% frequency dither), and external clock synchronization. The exposed-back LQFN package enables direct heatsink attachment for θJCBOT = 1.6°C/W on JEDEC board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide automotive battery range including cold-crank (4.5V) and load-dump (40V+) |
| Output Current | 15A continuous - enables single-chip 5V/15A or 3.3V/15A power rails without parallel devices |
| Switching Frequency | 200kHz to 2.2MHz - programmable via RT resistor; allows optimization of size vs. efficiency vs. EMI |
| Min On-Time | 25ns - enables high step-down ratios (e.g., 42V→3.3V) at 2MHz without pulse-skipping |
| Quiescent Current | 100µA in Burst Mode® at 12VIN→5VOUT - extends battery life in always-on automotive modules |
| Output Ripple | <10mVP-P - meets low-noise analog/RF supply requirements without additional post-regulation |
| Thermal Rating | Junction temp up to 150°C - qualified per AEC-Q100 Grade 1; supports under-hood automotive placement |
Pinout & Package
LT8648SJV#TRPBF uses a 36-lead 7mm × 4mm LQFN package with exposed back (pins 37–42) soldered to PCB ground for thermal conduction. Package is RoHS-compliant, e4 Au finish, MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (4–12) | Power switch node | Connects to inductor; multiple pins reduce resistance and improve thermal spreading for 15A operation |
| VIN (19–21, 26–28) | Main input supply | Multiple parallel pins minimize IR drop and inductance for high-current input path |
| GND (13–18, 23–24, 37–42) | Power and signal ground | Exposed pad (37–42) must be soldered to PCB ground plane for θJCBOT = 1.6°C/W thermal path |
| VC (34) | Error amplifier output | External RC network sets loop bandwidth; enables current sharing when paralleled with other LT8648S devices |
| SYNC/MODE (32) | Operating mode selector | Ground = Burst Mode®; float = FCM; INTVCC = spread spectrum; external clock = sync - no external logic required |
| PG (33) | Power good open-drain | Asserts high when FB is within ±7.75% of 0.6V and no fault (UVLO, thermal, overcurrent) |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 architecture | Integrated VIN/BST ceramic capacitors eliminate layout-sensitive high-di/dt loops, achieving CISPR 25 Class 5 radiated EMI compliance without shielding |
| Exposed-back LQFN package | θJCBOT = 1.6°C/W enables >15A operation at 150°C junction without external heatsink in typical 4-layer PCB |
| 25ns minimum on-time | Supports 42V→3.3V conversion at 2MHz without pulse-skipping, maintaining regulation during wide VIN transients |
| VC pin compensation | Allows full control of loop dynamics (gain/phase margin) and enables precise current sharing across paralleled regulators |
| Burst Mode® with 100µA IQ | Enables always-on automotive modules (e.g., telematics, ADAS sensors) to meet 100µA system standby targets |
| Spread-spectrum modulation | ±24% frequency dither reduces peak EMI by >10dB across 150kHz–108MHz, easing EMC certification effort |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers image sensor, radar processor, and CAN transceiver in forward-facing camera module requiring low EMI and 150°C operation. IC Role / Device Role / Timing Role: Primary 5V/15A buck converter delivering clean, regulated rail with <10mVP-P ripple and CISPR 25 Class 5 compliance. Use Value: Eliminates need for EMI filters and shielding, reducing BOM cost and PCB area while meeting automotive EMC requirements out-of-box. |
Use Scenario: Supplies 3.3V/10A to FPGA, ADCs, and isolated digital I/O in modular industrial controller with wide input voltage range. IC Role / Device Role / Timing Role: High-efficiency, wide-VIN synchronous buck providing stable 3.3V rail across 9–36V DC input with fast load-step response. Use Value: 25ns min on-time ensures regulation during 24V brownouts; FCM mode enables sub-10µs recovery from 5A load steps. |
| Telecom Remote Radio Unit | Medical Imaging Sensor Interface |
Use Scenario: Generates 5V/12A for RF front-end and baseband ASIC in outdoor small cell radio with limited airflow and high ambient temperature. IC Role / Device Role / Timing Role: Thermally robust buck converter using exposed-back package for direct heatsink mounting and 150°C junction rating. Use Value: θJCBOT = 1.6°C/W enables 12A continuous output at 85°C ambient without derating-reducing thermal design complexity. |
Use Scenario: Provides ultra-low-noise 3.3V/5A supply to high-resolution CT/MRI sensor front-ends where switching noise corrupts analog measurements. IC Role / Device Role / Timing Role: Silent Switcher 2 buck regulator delivering <10mVP-P ripple and minimal conducted/radiated noise near sensitive analog circuitry. Use Value: Integrated capacitors and optimized layout reduce EMI by >20dB vs. conventional buck, eliminating post-filtering and improving SNR. |
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 |
|---|---|---|---|
| LT8645SJV#TRPBF | 12A output current, same 42V input, identical pinout and package; lacks spread-spectrum mode | Lower current capacity; suitable where 15A headroom is unnecessary and EMI margin is sufficient without dither | Select when cost sensitivity outweighs need for 15A headroom or spread-spectrum EMI reduction |
| MPQ4436AGL-AEC1-Z | 12A, 45V input, AEC-Q100 qualified; uses different compensation scheme (type II vs. VC pin); no integrated BST cap | Requires external BST capacitor and more complex layout; higher EMI sensitivity due to external high-di/dt loops | Choose only if existing MPQ4436 design reuse is mandatory and thermal/EMI margins allow |
Compared with LT8645SJV#TRPBF and MPQ4436AGL-AEC1-Z, the LT8648SJV#TRPBF uniquely combines 15A capability, integrated Silent Switcher 2 capacitors, spread-spectrum modulation, and 150°C junction rating-enabling smaller, cooler, and more EMC-robust automotive and industrial power designs without layout compromises.
Availability
LT8648SJV#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS systems, industrial PLCs, telecom remote radio units, and medical imaging equipment requiring stable component supply, AEC-Q100 qualification, and high-temperature reliability.
Supply support for LT8648SJV#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, signal chain, and RF solutions.
The LT8648S/LT8648SP product line was designed specifically for noise-sensitive, high-reliability applications demanding ultralow EMI, wide input range, and automotive-grade thermal robustness-targeting ADAS, infotainment, and industrial automation power systems.
FAQ
What is the maximum junction temperature rating for the LT8648SJV#TRPBF?
The LT8648SJV#TRPBF is rated for operation up to 150°C junction temperature and is AEC-Q100 qualified for automotive Grade 1 applications. Its exposed-back LQFN package achieves θJCBOT = 1.6°C/W on JEDEC board, enabling reliable 15A operation at elevated ambient temperatures without derating when properly mounted to a heatsink or thermal pad.
Does the LT8648SJV#TRPBF require external BST and input capacitors?
No-the LT8648SJV#TRPBF integrates ceramic bypass capacitors for both BST and VIN internally, eliminating the need for external BST capacitors and reducing input capacitor count. This integration is core to its Silent Switcher 2 architecture and directly enables ultralow EMI performance with minimal layout sensitivity, as confirmed in the datasheet's block diagram and application notes.
How does the VC pin on the LT8648SJV#TRPBF differ from standard compensation pins?
The VC pin on the LT8648SJV#TRPBF is the output of the internal error amplifier and directly controls peak switch current. Unlike fixed-compensation regulators, it accepts an external RC network to set loop bandwidth and phase margin-enabling fast transient response and precise current sharing when multiple LT8648SJV#TRPBF devices operate in parallel, as specified in the Electrical Characteristics table and Applications Information section.
Can the LT8648SJV#TRPBF synchronize to an external clock source?
Yes-the LT8648SJV#TRPBF supports external clock synchronization via the SYNC/MODE pin (pin 32). When driven with a TTL/CMOS-compatible clock signal, the device operates in forced continuous mode and aligns its switching edges to the external clock, enabling deterministic timing and reduced beat frequencies in multi-rail systems-fully documented in the Pin Functions and OPERATION sections of the datasheet.
What is the typical quiescent current of the LT8648SJV#TRPBF in Burst Mode® operation?
The LT8648SJV#TRPBF draws 100µA quiescent current from VIN when regulating 12VIN to 5VOUT in Burst Mode® with BIAS tied to VOUT, as measured and specified in the Electrical Characteristics table (page 3, "VIN Quiescent Current in Sleep"). This value enables compliance with stringent automotive standby power budgets for always-on modules such as telematics and body controllers.
LT8648SJV#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-TFQFN 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):
- 2.45V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 15A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-LQFN (7x4)
LT8648SJV#TRPBF FAQ
1.How can I place an order for LT8648SJV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8648SJV#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 LT8648SJV#TRPBF reliable?
The price and inventory of LT8648SJV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8648SJV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8648SJV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8648SJV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8648SJV#TRPBF?
LT8648SJV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8648SJV#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 LT8648SJV#TRPBF?
For technical support, including LT8648SJV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8648SJV#TRPBF requirements.
6.How does Aetrix verify that LT8648SJV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8648SJV#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 LT8648SJV#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8648SJV#TRPBF?
All LT8648SJV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8648SJV#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 LT8648SJV#TRPBF part is unused and in its original packaging.
Return procedure for LT8648SJV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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