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Analog Devices Inc. LT8648SEV#TRPBF
- Part No.:
- LT8648SEV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-TFQFN Exposed Pad
- Datasheet:
-
LT8648SEV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 15A 36LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,435
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Product details
Overview
LT8648SEV#TRPBF from Analog Devices is a 42V, 15A synchronous step-down Silent Switcher 2 regulator with integrated input/boost capacitors, 25ns minimum on-time, and 200kHz–2.2MHz adjustable switching frequency. It delivers up to 95.5% efficiency at 1MHz (12VIN→5VOUT) and features ultralow EMI emissions for noise-sensitive automotive and industrial power supplies.
For engineers reviewing the LT8648SEV#TRPBF datasheet, LT8648SEV#TRPBF pinout, LT8648SEV#TRPBF application, or LT8648SEV#TRPBF equivalent, this page provides verified technical context, thermal performance data, EMI mitigation features, compensation interface details, and validated alternative options for high-current DC/DC design.
Technical Context
The LT8648SEV#TRPBF implements peak current mode control with second-generation Silent Switcher 2 architecture, integrating ceramic bypass capacitors inside the LQFN package to minimize fast-switching loop area and reduce radiated EMI without external filtering. Its 25ns minimum on-time enables high step-down ratios (e.g., 42V→3.3V) at 2MHz.
External compensation via the VC pin supports fast transient response across full load range; CLKOUT enables synchronization of multiple regulators; SYNC/MODE pin selects Burst Mode, forced continuous mode (FCM), spread spectrum, or external clock sync. The device tolerates reverse current and includes ±7.75% PG threshold accuracy with fault reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-range industrial and automotive battery inputs including cold-crank and load-dump conditions. |
| Output Current | 15A continuous - sufficient for FPGA core rails, ADAS domain controllers, and high-power sensor modules. |
| 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 - reduces thermal load in space-constrained enclosures. |
| Quiescent Current | 100µA in Burst Mode (12VIN→5VOUT) - extends battery life in always-on systems. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum - eliminates need for external EMI filters in automotive designs. |
| Minimum On-Time | 25ns - enables direct 42V-to-3.3V conversion at 2MHz without intermediate stages. |
| Thermal Rating | –40°C to 125°C junction - qualified for under-hood and industrial ambient environments. |
Pinout & Package
LT8648SEV#TRPBF uses a 36-lead 7mm × 4mm LQFN package with exposed GND pad (pins 37–42). Thermal resistance θJA = 26°C/W (JEDEC board), θJCTOP = 20.9°C/W, θJCBOT = 2.3°C/W. Exposed pad must be soldered to PCB for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (4–12) | Power switch node | Connects to inductor; fast-edge switching requires minimal trace area to suppress EMI. |
| VIN (19–21, 26–28) | Main input supply | Multiple pins reduce IR drop; requires ≥10µF local ceramic bypass near pins. |
| GND (13–18, 23, 24, 37–42) | Power and signal ground | Exposed pad (37–42) is primary thermal path; must be soldered to large copper pour. |
| EN/UV (29) | Enable / undervoltage lockout | Hysteretic threshold (0.94V/0.98V) allows precise input brownout protection. |
| RT (30) | Frequency programming | Resistor to GND sets fSW: 38.3kΩ = 1MHz; tolerance directly impacts regulation stability. |
| VC (34) | Error amplifier output | External RC network enables loop compensation tuning and multi-phase current sharing. |
| PG (33) | Power good indicator | Open-drain output asserts high when VOUT is within ±7.75% of target and no faults exist. |
| SYNC/MODE (32) | Operating mode control | GND = Burst Mode; float = FCM; INTVCC = spread spectrum; external clock = sync mode. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 architecture | Integrated VIN/BST ceramic capacitors minimize high-di/dt loop area, enabling CISPR 25 Class 5 compliance without added filter components. |
| 25ns minimum on-time | Supports single-stage 42V-to-3.3V conversion at 2MHz, eliminating cascaded regulators and reducing BOM count. |
| External VC compensation | Enables optimized transient response across full load range and facilitates accurate current sharing in parallel configurations. |
| Spread spectrum modulation | +24% triangular frequency dither reduces peak EMI amplitude by >10dB, easing EMC certification. |
| Exposed thermal pad (LQFN) | θJCBOT = 2.3°C/W enables >15A operation at <125°C junction temp with 2oz copper and 6 thermal vias. |
| AEC-Q100 qualified | Rated for automotive applications (–40°C to 125°C), with guaranteed performance over full temperature range and lifetime reliability data available. |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers radar processor and image sensor SoCs in forward collision warning systems requiring low-noise 5V/15A rail. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 5V with ultralow EMI to avoid RF interference with 77GHz radar signals. Use Value: Silent Switcher 2 architecture meets CISPR 25 Class 5 limits without ferrite beads or metal shields, reducing system cost and size. |
Use Scenario: Supplies field I/O circuitry in modular PLC backplanes where 24V industrial bus must be stepped down to 5V/15A for digital isolators and ADCs. IC Role / Device Role / Timing Role: High-current DC/DC converter operating in forced continuous mode for fast load-step response during analog input sampling bursts. Use Value: 25ns min on-time and 2.2MHz max fSW enable compact 12mm × 12mm solution footprint while maintaining >93% efficiency at full load. |
| Medical Imaging Sensor Hub | 5G Small Cell Baseband Power |
Use Scenario: Provides clean 3.3V/12A rail to CMOS image sensor arrays and correlated double sampling circuits in portable ultrasound devices. IC Role / Device Role / Timing Role: Low-ripple, low-noise buck regulator with Burst Mode for standby and FCM for active imaging cycles. Use Value: Output ripple <10mVP-P and 100µA IQ in Burst Mode extend battery runtime while preserving SNR in analog front-end paths. |
Use Scenario: Generates 1.8V/10A for FPGA-based baseband processors in outdoor small cells exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: High-efficiency, thermally robust buck converter with AEC-Q100 qualification supporting extended industrial temperature operation. Use Value: Exposed pad + θJCBOT = 2.3°C/W allows full 15A output at 85°C ambient without derating, simplifying thermal design. |
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 |
|---|---|---|---|
| LT8645SIV#TRPBF | 12A output, same 42V input, identical Silent Switcher 2 architecture and pinout except fewer SW pins (6 vs 9). | Lower current capacity; suitable where 12A suffices and board layout reuse is prioritized. | Select when thermal budget permits lower current and footprint compatibility with existing LT8648S layouts is required. |
| MPQ4436AGL-AEC1-Z | 15A, 40V input, AEC-Q100 Grade 1, but lacks integrated capacitors, spread spectrum, and VC compensation interface. | Higher EMI sensitivity; requires external input filtering and more complex loop compensation. | Choose for cost-sensitive automotive applications where EMI filter area is available and VC-level control is not needed. |
Compared with LT8648SEV#TRPBF, LT8645SIV#TRPBF offers pin-compatible downsizing for 12A use cases, while MPQ4436AGL-AEC1-Z trades integrated EMI reduction and advanced control features for lower unit cost in less noise-critical designs.
Availability
LT8648SEV#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial PLC I/O modules, medical imaging sensor hubs, and 5G small cell baseband power systems requiring stable component supply and long-term production continuity.
Supply support for LT8648SEV#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 precision instrumentation, communications, and automotive markets since 1965.
The LT8648S/LT8648SP product line was engineered specifically for high-current, low-EMI DC/DC conversion in automotive and industrial environments where reliability, thermal performance, and regulatory compliance are critical.
FAQ
What is the maximum output current capability of the LT8648SEV#TRPBF?
The LT8648SEV#TRPBF delivers 15A continuous output current under typical thermal conditions (θJA = 26°C/W, 2oz copper, 6 thermal vias). Derating applies above 85°C ambient; full 15A is guaranteed up to 125°C junction temperature per datasheet specifications. The LT8648SEV#TRPBF achieves this using its exposed thermal pad and low RDS(ON) top/bottom MOSFETs (12mΩ/4.5mΩ).
Does the LT8648SEV#TRPBF require external input capacitors despite its integrated Silent Switcher 2 capacitors?
Yes, the LT8648SEV#TRPBF still requires external input capacitors: two small ceramic capacitors (<1µF) placed adjacent to the IC and one bulk capacitor (≥10µF) nearby. The integrated capacitors optimize high-frequency AC loops but do not replace bulk energy storage or low-frequency decoupling. The LT8648SEV#TRPBF datasheet specifies this in Figure 1 and Applications Information section.
How does the LT8648SEV#TRPBF achieve CISPR 25 Class 5 compliance?
The LT8648SEV#TRPBF achieves CISPR 25 Class 5 compliance through second-generation Silent Switcher 2 architecture: integrated VIN and BST ceramic capacitors minimize high-di/dt loop area, fast clean edges reduce harmonic content, and optional spread spectrum modulation lowers peak EMI by >10dB. Verified on DC2841A demo board with EMI filter, as shown in Figures G38–G39.
Can the LT8648SEV#TRPBF operate with an input voltage below 3V?
No, the LT8648SEV#TRPBF has a minimum input voltage of 2.45V at 400kHz and 2.75V at 2MHz per Electrical Characteristics table. Operation below 3V is only supported at lower switching frequencies and light loads; the guaranteed operational range is 3V to 42V. Attempting sub-3V operation risks UVLO activation and regulation loss.
What is the purpose of the VC pin on the LT8648SEV#TRPBF and how is it used?
The VC pin on the LT8648SEV#TRPBF is the error amplifier output, controlling peak switch current. It enables external loop compensation via RC network for optimized transient response, supports current sharing in parallel configurations, and allows dynamic adjustment of bandwidth. The LT8648SEV#TRPBF datasheet specifies VC source/sink current (320µA) and transconductance (1.1–1.8mS) to guide network design.
LT8648SEV#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-LQFN (7x4)
LT8648SEV#TRPBF FAQ
1.How can I place an order for LT8648SEV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8648SEV#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 LT8648SEV#TRPBF reliable?
The price and inventory of LT8648SEV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8648SEV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8648SEV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8648SEV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8648SEV#TRPBF?
LT8648SEV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8648SEV#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 LT8648SEV#TRPBF?
For technical support, including LT8648SEV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8648SEV#TRPBF requirements.
6.How does Aetrix verify that LT8648SEV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8648SEV#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 LT8648SEV#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8648SEV#TRPBF?
All LT8648SEV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8648SEV#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 LT8648SEV#TRPBF part is unused and in its original packaging.
Return procedure for LT8648SEV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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