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Analog Devices Inc. LT8648SJV#WPBF
- Part No.:
- LT8648SJV#WPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-TFQFN Exposed Pad
- Datasheet:
-
LT8648SJV#WPBF.pdf
- Description:
- IC REG BUCK ADJ 15A 36LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
LT8648SJV#WPBF 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 ultralow EMI emissions. It delivers up to 95.5% efficiency at 1MHz (12VIN→5VOUT) and supports forced continuous, Burst Mode®, and spread-spectrum operation in a 36-lead 7mm × 4mm LQFN package with exposed back for thermal enhancement.
For engineers reviewing the LT8648SJV#WPBF datasheet, LT8648SJV#WPBF pinout, LT8648SJV#WPBF application, or LT8648SJV#WPBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, integrated input/boost capacitors for layout-insensitive EMI performance, VC pin for external compensation and current sharing, and CLKOUT for multi-regulator synchronization.
Technical Context
The LT8648SJV#WPBF implements peak current mode control with second-generation Silent Switcher 2 architecture, integrating ceramic bypass capacitors internally for VIN and BST nodes to minimize high-di/dt loop area and radiated EMI. Its 25ns minimum on-time enables high step-down ratios (e.g., 42V→3.3V) at 2MHz switching.
Operation modes are selected via SYNC/MODE pin: ground for Burst Mode® (140µA IQ), floating for forced continuous mode (fast transient response, negative inductor current allowed), high for spread-spectrum + FCM, or driven clock for external synchronization. The VC pin provides error amplifier output for loop compensation, current sharing, and dynamic response tuning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide automotive battery transients including cold-crank (≥3V) and load-dump (≤42V). |
| Output Current | 15A continuous - sufficient for high-power ADAS domain controllers or infotainment SoCs. |
| Switching Frequency | 200kHz to 2.2MHz - programmable via RT resistor; enables compact magnetics and avoids AM band interference. |
| Efficiency | 95.5% at 1MHz, 12VIN→5VOUT - minimizes thermal stress in sealed automotive enclosures. |
| Quiescent Current | 100µA in Burst Mode® (12VIN→5VOUT) - extends battery life during vehicle sleep modes. |
| EMI Performance | CISPR 25 Class 5 compliant - achieves radiated emission limits without external EMI filters in typical layouts. |
| Thermal Rating | Junction temp: –40°C to 150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood environments. |
Pinout & Package
LT8648SJV#WPBF uses a 36-lead 7mm × 4mm LQFN package with exposed back (pins 37–42) soldered to PCB for thermal conduction. Package is RoHS-compliant, MSL Level 3, and rated for –40°C to 150°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Reduces input quiescent current when tied to VOUT ≥3.3V; enables >95% efficiency at light loads. |
| INTVCC (2) | Internal 3.4V power rail bypass | Requires ≥1µF low-ESR ceramic capacitor; powers gate drivers and control logic; sourced from BIAS if >3.1V, else from VIN. |
| SW (4–12) | Power switch node | 10 parallel pins reduce resistance and inductance; must be connected together and routed to inductor with minimal loop area. |
| GND (13–18, 23, 24, 37–42) | Power and signal ground | Multiple GND pins and large exposed pad ensure low-impedance return path and thermal dissipation; pad must be soldered. |
| VIN (19–21, 26–28) | Main input power supply | 9-pin parallel connection reduces IR drop; requires local ≥10µF ceramic input capacitor with short, low-inductance path to GND. |
| EN/UV (29) | Enable and undervoltage lockout | Hysteretic threshold (0.94V/0.98V) enables reliable startup and brownout protection; tie to VIN if always-on. |
| RT (30) | Frequency programming | Resistor to GND sets oscillator frequency; 38.3kΩ yields 1MHz - critical for EMI optimization and inductor selection. |
| CLKOUT (31) | Clock output | 180° out-of-phase square wave at switching frequency; enables precise synchronization of multiple regulators to avoid beat frequencies. |
| SYNC/MODE (32) | Operating mode control | Selects Burst Mode®, forced continuous, spread-spectrum, or external sync - single-pin multimode interface simplifies system-level control. |
| PG (33) | Power good indicator | Open-drain output asserts high only when FB is within ±7.75% of 0.6V reference and no faults exist - used for system sequencing and fault reporting. |
| VC (34) | Error amplifier output | External RC network sets loop compensation; enables fast transient response and master-slave current sharing in parallel configurations. |
| SS (35) | Soft-start and tracking | 2µA internal pull-up allows capacitor-programmed voltage ramp; supports output tracking in multi-rail systems. |
| FB (36) | Feedback reference node | Regulated to 0.6V ±0.4%; connects to resistor divider; phase-lead capacitor (4.7–47pF) improves stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 Architecture | Integrated VIN/BST ceramic capacitors minimize high-frequency loop area, enabling CISPR 25 Class 5 compliance without added filter components. |
| Exposed Back Thermal Package | Thermal resistance θJCBOT = 1.6°C/W on JEDEC board - enables >15A operation in thermally constrained automotive modules without heatsinks. |
| 25ns Minimum On-Time | Supports 42V→3.3V conversion at 2MHz, eliminating need for cascaded regulation in high-input-voltage systems. |
| Spread Spectrum Modulation | ±24% triangular frequency dither reduces peak EMI by >10dB - effective for passing narrowband radiated emission limits. |
| AEC-Q100 Grade 1 Qualification | Validated for –40°C to 150°C operation with full electrical characterization - meets automotive reliability and lifetime requirements. |
Applications
| Automotive ADAS Power Supply | Industrial Motor Drive Auxiliary Rail |
|---|---|
Use Scenario: Powers radar SoC and sensor fusion processor in front-facing camera module requiring clean, low-noise 5V/15A supply. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V rail with <10mVP-P ripple and ultralow EMI to avoid RF interference with 77GHz radar signals. Use Value: Silent Switcher 2 architecture eliminates need for external EMI filters, reducing BOM cost and PCB area while meeting ISO 11452-2 immunity requirements. | Use Scenario: Generates isolated 15V gate drive rail for IGBT half-bridge in servo drive, powered from 48V DC bus. IC Role / Device Role / Timing Role: High-efficiency synchronous buck providing stable auxiliary voltage with fast load-step response during PWM transitions. Use Value: Forced continuous mode ensures consistent switching frequency across full load range, preventing audible noise and enabling predictable EMI filtering design. |
| Telecom Remote Radio Unit | Medical Imaging Detector Bias |
Use Scenario: Supplies 3.3V/12A to FPGA and transceiver ASIC in outdoor 5G RRH unit exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Wide-input (3V–42V), high-temp (–40°C to 150°C) regulator maintaining regulation during 48V PoE+ surges and cold starts. Use Value: AEC-Q100 qualification ensures long-term reliability in uncontrolled environments; spread-spectrum mode suppresses harmonics near cellular bands. | Use Scenario: Provides ultra-low-noise 2.5V/8A bias for CMOS image sensor array in portable ultrasound probe. IC Role / Device Role / Timing Role: Low-ripple, low-EMI buck converter operating in Burst Mode® during standby to extend battery runtime. Use Value: 100µA quiescent current and <10mVP-P output ripple preserve signal integrity and SNR in analog front-end circuits. |
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#WPBF | Same package and pinout; lower 8A output current; identical Silent Switcher 2 architecture and AEC-Q100 rating. | Targeted at mid-power ADAS ECUs (e.g., surround-view cameras) where 15A headroom is unnecessary. | Select when system load is ≤8A and cost reduction is prioritized without sacrificing EMI performance or thermal grade. |
| MPQ4333GJ-AEC1-P | Monolithic 3.5A buck; smaller 3mm × 4mm QFN; lacks spread spectrum, VC pin, and CLKOUT; 40V max input. | Suitable for low-power automotive subsystems (e.g., HVAC control) where full 15A capability and advanced features are not required. | Choose for space-constrained designs with modest current needs and simplified feature set; verify EMI compliance separately. |
Compared with LT8645SJV#WPBF and MPQ4333GJ-AEC1-P, the LT8648SJV#WPBF uniquely combines 15A output, AEC-Q100 Grade 1 rating, spread-spectrum EMI reduction, and multi-regulator synchronization - making it the only option for high-current, noise-sensitive automotive power rails demanding full feature integration.
Availability
LT8648SJV#WPBF is available at Aetrix Electronics and suitable for automotive ADAS systems, industrial motor drives, telecom remote radio units, and medical imaging equipment requiring stable component supply across extended temperature ranges and stringent EMI compliance.
Supply support for LT8648SJV#WPBF 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 LT8648S/LT8648SP product line was designed specifically for automotive and industrial applications demanding ultralow EMI, high efficiency at high frequencies, and robust operation across extreme temperature ranges - addressing noise-sensitive power conversion challenges in ADAS, infotainment, and factory automation.
FAQ
What is the maximum junction temperature rating for the LT8648SJV#WPBF?
The LT8648SJV#WPBF is rated for a maximum junction temperature of 150°C and is qualified per AEC-Q100 Grade 1. This rating is confirmed in the Absolute Maximum Ratings table and applies across the full –40°C to 150°C operating junction temperature range, with thermal derating above 125°C per manufacturer guidelines.
Does the LT8648SJV#WPBF support external synchronization of its switching frequency?
Yes, the LT8648SJV#WPBF supports external synchronization via the SYNC/MODE pin (pin 32). When driven with a clean clock signal, the device operates in forced continuous mode and locks its internal oscillator to the external frequency - enabling deterministic EMI management and elimination of beat frequencies in multi-rail systems.
How does the LT8648SJV#WPBF achieve ultralow EMI emissions without external filters?
The LT8648SJV#WPBF achieves ultralow EMI through second-generation Silent Switcher 2 architecture, which integrates ceramic bypass capacitors for VIN and BST internally. This minimizes high-di/dt loop area, reduces PCB layout sensitivity, and enables CISPR 25 Class 5 compliance on standard 4-layer boards without added EMI filter components.
What is the purpose of the VC pin on the LT8648SJV#WPBF, and how is it used?
The VC pin (pin 34) on the LT8648SJV#WPBF is the output of the internal error amplifier. It is used for external loop compensation via an RC network to optimize transient response, enable current sharing in parallel configurations, and support custom control loop design - directly influencing stability and dynamic performance.
Can the LT8648SJV#WPBF operate with an input voltage below 3V?
No, the LT8648SJV#WPBF has a minimum input voltage of 2.45V at 400kHz and 2.75V at 2MHz, but the recommended minimum operating input is 3V per the Electrical Characteristics table. Operation below 3V risks failure to regulate and is outside the specified operating range; startup dropout testing confirms reliable regulation begins at ≥3V.
LT8648SJV#WPBF 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-LQFN (7x4)
LT8648SJV#WPBF FAQ
1.How can I place an order for LT8648SJV#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8648SJV#WPBF 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#WPBF reliable?
The price and inventory of LT8648SJV#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8648SJV#WPBF is usually 5 days.
3.What payment methods are accepted for LT8648SJV#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8648SJV#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8648SJV#WPBF?
LT8648SJV#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8648SJV#WPBF 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#WPBF?
For technical support, including LT8648SJV#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8648SJV#WPBF requirements.
6.How does Aetrix verify that LT8648SJV#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8648SJV#WPBF 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#WPBF meets industry standards.
7.What is the process for return or replacement of LT8648SJV#WPBF?
All LT8648SJV#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8648SJV#WPBF, 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#WPBF part is unused and in its original packaging.
Return procedure for LT8648SJV#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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