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Analog Devices Inc. LT8648SJV#PBF
- Part No.:
- LT8648SJV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-TFQFN Exposed Pad
- Datasheet:
-
LT8648SJV#PBF.pdf
- Description:
- IC REG BUCK ADJ 15A 36LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,838
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Product details
Overview
LT8648SJV#PBF from Analog Devices is a 42V, 15A synchronous step-down DC/DC regulator featuring second-generation Silent Switcher 2 architecture for ultralow EMI emissions. It delivers up to 95.5% efficiency at 1MHz (12VIN→5VOUT), supports 200kHz–2.2MHz adjustable switching frequency, and operates across –40°C to 150°C junction temperature. It is used in automotive ADAS power supplies where low noise, high reliability, and thermal robustness are critical.
For engineers reviewing the LT8648SJV#PBF datasheet, LT8648SJV#PBF pinout, LT8648SJV#PBF application, or LT8648SJV#PBF equivalent, key selection considerations include its AEC-Q100 qualification, exposed-back LQFN thermal performance, 25ns minimum on-time for high step-down ratios, spread spectrum EMI reduction, and VC-pin-based external compensation for fast transient response in noise-sensitive systems.
Technical Context
The LT8648SJV#PBF implements peak current mode control with integrated input and boost capacitors inside the package to minimize fast-current-loop area-core to its Silent Switcher 2 EMI suppression. Its internal 0.6V reference, 25ns min-on-time, and frequency foldback during startup/overload ensure stable regulation under wide VIN (3V–42V) and dynamic load conditions.
It supports four operating modes via SYNC/MODE pin: Burst Mode (140µA IQ), forced continuous mode (fast transients, negative inductor current), spread spectrum (±24% modulation), and external synchronization. The VC pin enables loop compensation tuning and current sharing, while CLKOUT provides 180° out-of-phase clock output for multi-regulator coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide automotive battery transients including cold-crank (≥4.5V) and load-dump (≤42V). |
| Output Current | 15A continuous - enables single-chip 5V/15A or 3.3V/12A rails for radar, camera, or domain controllers. |
| Switching Frequency | 200kHz to 2.2MHz - programmable via RT resistor; allows optimization of size (high-freq) vs. efficiency (low-freq). |
| Min On-Time | 25ns - enables 12V→1.0V conversion at 2MHz without pulse-skipping, critical for high-ratio point-of-load designs. |
| Efficiency @ 12V→5V | 95.5% at 1MHz - reduces thermal load in confined enclosures; measured with 1µH inductor and ceramic output caps. |
| Quiescent Current | 100µA in Burst Mode (12VIN→5VOUT) - extends battery life in always-on vehicle modules. |
| EMI Performance | CISPR 25 Class 5 compliant - achieves radiated emission limits without external EMI filters in typical layouts. |
| Junction Temp Range | –40°C to 150°C - qualified per AEC-Q100 Grade 1, enabling placement near hot engine compartments. |
Pinout & Package
LT8648SJV#PBF uses a 36-lead 7mm × 4mm LQFN package with exposed back (pins 37–42) soldered to PCB for enhanced thermal conduction. Thermal resistance θJA = 26°C/W (JEDEC board), θJCBOT = 1.6°C/W - enabling >12W power dissipation with minimal heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (4–12) | Power switch node | Connects to inductor; multiple parallel pins reduce AC resistance and EMI; must be minimized in layout. |
| VIN (19–21, 26–28) | Main input supply | High-current path for topside switch and IC bias; requires local ≥10µF ceramic bypass close to pins. |
| GND (13–18, 23–24, 37–42) | Power and signal ground | Exposed pad (37–42) is primary thermal path; must be fully soldered to inner-layer copper pour for θJCBOT = 1.6°C/W. |
| BIAS (1) | Internal regulator supply | When tied to VOUT (≥3.3V), reduces VIN current draw and improves light-load efficiency. |
| VC (34) | Error amplifier output | External RC network sets loop bandwidth; enables current sharing across paralleled regulators. |
| SYNC/MODE (32) | Operating mode selector | Ground = Burst Mode; float = FCM; INTVCC = spread spectrum; external clock = sync - no external logic needed. |
| PG (33) | Power good indicator | Open-drain output asserts high when FB is within ±7.75% of 0.6V and no fault (UVLO, thermal, EN) is present. |
| RT (30) | Frequency programming | Resistor to GND sets fSW: 38.3kΩ = 1MHz; tolerance directly impacts frequency accuracy and EMI peak spacing. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 architecture | Integrated VIN and BST bypass capacitors minimize high-di/dt loop area, reducing radiated EMI by >30dB vs. prior gen. |
| Exposed-back thermal package | θJCBOT = 1.6°C/W enables >12W dissipation with standard 4-layer PCB; eliminates need for external heatsink in most automotive apps. |
| 25ns minimum on-time | Supports 12V→1.0V conversion at 2MHz, enabling compact 2-phase or single-phase high-ratio POL without external drivers. |
| Spread spectrum modulation | ±24% triangular frequency dither spreads EMI energy, easing compliance with CISPR 25 Class 5 without filter redesign. |
| VC-pin external compensation | Enables precise loop tuning for fast load-step response (<50µs recovery for 1A step) and seamless current sharing in parallel configurations. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C operation with HTOL, TC, and UHAST; suitable for front-end ADAS, infotainment, and body control modules. |
Applications
| Automotive ADAS Camera Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 5V/3A image sensor and ISP in forward-facing camera module mounted near windshield. IC Role / Device Role / Timing Role: Primary 12V→5V buck converter delivering low-noise, ripple-free supply with fast transient response to handle burst-mode imaging. Use Value: Silent Switcher 2 ensures CISPR 25 compliance without added ferrite beads; 150°C rating survives under-hood ambient up to 105°C. |
Use Scenario: Generating isolated 5V/2A rail for digital I/O protection circuitry in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: High-efficiency, wide-input buck supplying field-side logic while rejecting 24V industrial bus transients. Use Value: 42V max input withstands 36V surges; 100µA Burst Mode IQ extends backup battery runtime during brownouts. |
| Automotive Infotainment SoC Core | Ruggedized Telematics Gateway |
Use Scenario: Providing 1.0V/8A core voltage for ARM-based infotainment processor in center console unit. IC Role / Device Role / Timing Role: High-ratio, high-frequency buck converting 12V battery to sub-1.2V SoC rail with tight voltage regulation. Use Value: 25ns min-on-time enables direct 12V→1.0V at 2MHz; VC compensation ensures <30µs transient recovery under CPU load spikes. |
Use Scenario: Supplying 3.3V/5A for cellular modem, GNSS receiver, and CAN transceivers in vehicle-to-cloud telematics unit. IC Role / Device Role / Timing Role: Single-chip 42V-input buck delivering clean, EMI-hardened power for mixed-signal RF and digital subsystems. Use Value: Spread spectrum + integrated caps eliminate need for external EMI filter; AEC-Q100 ensures 15-year field reliability. |
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#PBF | Same package, 8A output current, identical pinout and features except lower current limit (20A vs. 30A top FET limit). | Not suitable for >8A loads; retains same EMI performance and thermal design but lower power capability. | Select when system load is ≤8A and cost optimization is prioritized over headroom. |
| MPQ4333GJ-AEC1-Z | Monolithic 3.5A buck (not 15A); AEC-Q100 qualified; 3.8V–36V input; no spread spectrum or VC compensation. | Limited to low-power domains (e.g., MCU cores); lacks Silent Switcher EMI advantage and current-sharing capability. | Use only for auxiliary rails ≤3.5A where full LT8648SJV#PBF capability is unnecessary. |
Compared with LT8648SJV#PBF, LT8645SJV#PBF offers identical layout and thermal design but reduced current capacity, while MPQ4333GJ-AEC1-Z trades scalability and EMI robustness for integration density in low-power automotive nodes.
Availability
LT8648SJV#PBF is available at Aetrix Electronics and suitable for automotive ADAS, industrial PLCs, and ruggedized telematics requiring stable component supply, long lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8648SJV#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 power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8648S/LT8648SP product line was designed specifically for automotive and industrial applications demanding ultralow EMI, high efficiency at high frequencies, and extended temperature operation - addressing noise-sensitive radar, camera, and control systems.
FAQ
What is the maximum output current capability of the LT8648SJV#PBF?
The LT8648SJV#PBF delivers up to 15A continuous output current under proper thermal conditions - verified with 4-layer PCB, full exposed-pad soldering, and 200LFM airflow. Its top FET current limit is 30A (typical), and bottom FET limit is 24A (typical), ensuring robust overload handling without latch-off in forced continuous mode.
Does the LT8648SJV#PBF require external input capacitors despite its integrated bypass capacitors?
Yes, the LT8648SJV#PBF still requires external input capacitors: two small ceramic caps (<1µF) placed immediately adjacent to the VIN and BST pins, plus a bulk ≥10µF ceramic capacitor nearby. The integrated capacitors reduce high-frequency loop area but do not replace bulk storage or low-ESR filtering needed for transient response and stability.
How does the exposed back on the LT8648SJV#PBF improve thermal performance compared to standard LQFN packages?
The LT8648SJV#PBF's exposed back (pins 37–42) connects directly to the silicon die, achieving θJCBOT = 1.6°C/W - over 10× better than top-side conduction. When soldered to a 2oz copper thermal pad with 6+ vias to inner layers, it dissipates >12W at ΔT = 20°C, eliminating need for external heatsinks in most automotive under-hood placements.
Can the LT8648SJV#PBF synchronize to an external clock while operating in spread spectrum mode?
No - spread spectrum mode and external synchronization are mutually exclusive on the LT8648SJV#PBF. When SYNC/MODE is driven by an external clock, the part operates in forced continuous mode only. Spread spectrum requires SYNC/MODE to be tied high to INTVCC (or >3V), disabling external sync functionality per the datasheet's mode table.
What is the purpose of the VC pin on the LT8648SJV#PBF, and how is it used in practice?
The VC pin on the LT8648SJV#PBF is the error amplifier output, used to set loop compensation via an external RC network. In practice, designers select R and C values based on desired crossover frequency and phase margin - e.g., 10kΩ + 1nF for ~100kHz bandwidth. It also enables current sharing when paralleling multiple LT8648SJV#PBF units by connecting VC pins together with small resistors.
LT8648SJV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 36-TFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-LQFN (7x4)
LT8648SJV#PBF FAQ
1.How can I place an order for LT8648SJV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8648SJV#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 LT8648SJV#PBF reliable?
The price and inventory of LT8648SJV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8648SJV#PBF is usually 5 days.
3.What payment methods are accepted for LT8648SJV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8648SJV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8648SJV#PBF?
LT8648SJV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8648SJV#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 LT8648SJV#PBF?
For technical support, including LT8648SJV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8648SJV#PBF requirements.
6.How does Aetrix verify that LT8648SJV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8648SJV#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 LT8648SJV#PBF meets industry standards.
7.What is the process for return or replacement of LT8648SJV#PBF?
All LT8648SJV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8648SJV#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 LT8648SJV#PBF part is unused and in its original packaging.
Return procedure for LT8648SJV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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