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Analog Devices Inc. LT8648SHV#PBF
- Part No.:
- LT8648SHV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-TFQFN Exposed Pad
- Datasheet:
-
LT8648SHV#PBF.pdf
- Description:
- IC REG BUCK ADJ 15A 36LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:669
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Product details
Overview
LT8648SHV#PBF from Analog Devices is a 42V, 15A synchronous step-down Silent Switcher 2 regulator with second-generation EMI suppression architecture, 25ns minimum on-time, 200kHz–2.2MHz adjustable switching frequency, and AEC-Q100 qualification for automotive applications. It delivers up to 95.5% efficiency at 1MHz (12VIN→5VOUT) and supports forced continuous, Burst Mode®, and spread-spectrum operation in a thermally enhanced 36-lead LQFN package with exposed back.
For engineers reviewing the LT8648SHV#PBF datasheet, LT8648SHV#PBF pinout, LT8648SHV#PBF application, or LT8648SHV#PBF equivalent, key selection considerations include its ultralow radiated EMI performance per CISPR 25 Class 5, integrated input/BST capacitors, external compensation via VC pin for fast transient response, and thermal design enabled by the exposed die pad.
Technical Context
The LT8648SHV#PBF employs peak current mode control with a 25ns minimum on-time to support high step-down ratios at frequencies up to 2.2MHz. Its Silent Switcher 2 architecture integrates internal ceramic bypass capacitors for VIN and BST nodes, minimizing high-di/dt loop area and reducing PCB layout sensitivity for EMI compliance.
It features four selectable operating modes via the SYNC/MODE pin: Burst Mode® (low IQ), forced continuous mode (fast transients, negative inductor current), spread-spectrum modulation (±24% frequency dither), and external clock synchronization. The VC pin enables loop compensation tuning and current sharing across parallel regulators.
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 external MOSFETs |
| Switching Frequency | 200kHz to 2.2MHz - programmable via RT resistor; allows optimization of size vs. efficiency vs. EMI |
| Min On-Time | 25ns - enables 12V-to-1V conversion at 2MHz without pulse-skipping or instability |
| Quiescent Current | 100µA in Burst Mode® (12VIN→5VOUT) - meets automotive standby requirements (e.g., infotainment keep-alive) |
| Feedback Reference | 0.6V ±0.002V - tight tolerance enables accurate output regulation across temperature and line |
| EMI Performance | CISPR 25 Class 5 compliant - achieves radiated emissions <40dBµV/m (30–1000MHz) with standard PCB layout |
| Thermal Rating | Junction temp: –40°C to 150°C - qualified per AEC-Q100 Grade 1; exposed back enables direct heatsink attachment |
Pinout & Package
LT8648SHV#PBF uses a 36-lead 7mm × 4mm × 0.94mm LQFN package with an exposed die pad (pins 37–42) soldered to PCB ground for thermal conduction. The package is RoHS-compliant, e4 Au finish, MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Reduces VIN current draw when tied to ≥3.3V output; improves light-load efficiency |
| INTVCC (2) | Internal 3.4V regulator bypass | Requires ≥1µF local ceramic cap; powers gate drivers and control logic |
| BST (3) | Bootstrap capacitor connection | Floats externally; internal ceramic BST cap eliminates discrete bootstrap diode/cap |
| SW (4–12) | Power switch node | Multiple parallel pins reduce resistance/inductance; must be routed as single low-inductance node |
| 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/outer ground planes |
| VIN (19–21, 26–28) | Main input power supply | Multiple pins reduce IR drop; requires ≥10µF local ceramic + bulk input capacitance |
| EN/UV (29) | Enable / undervoltage lockout | Hysteresis (40mV); 0.98V rising threshold enables startup above battery brownout |
| RT (30) | Frequency programming | Resistor to GND sets fSW: 226kΩ = 170kHz, 38.3kΩ = 1MHz, 16.9kΩ = 2MHz |
| CLKOUT (31) | Switching clock output | 180° out-of-phase square wave; synchronizes other regulators without external oscillator |
| SYNC/MODE (32) | Operating mode select | GND = Burst Mode®, float = FCM, INTVCC = spread spectrum, external clock = sync mode |
| PG (33) | Power good indicator | Open-drain; asserts high only when VOUT within ±7.75% and no fault (UVLO, thermal, overcurrent) |
| VC (34) | Error amplifier output | External RC network sets loop compensation; enables current sharing in parallel configurations |
| SS (35) | Soft-start / tracking | 2µA internal pull-up enables capacitor-programmed slew rate; supports output voltage tracking |
| FB (36) | Feedback reference input | Regulates to 0.6V; requires phase-lead capacitor (4.7–47pF) between FB and VOUT for stability |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 architecture | Integrated VIN and BST ceramic capacitors minimize high-di/dt loop area, enabling CISPR 25 Class 5 compliance without shielding or complex layout |
| Ultralow quiescent current | 100µA IQ at 12VIN→5VOUT in Burst Mode® - extends battery life in always-on automotive modules |
| 25ns minimum on-time | Supports high-frequency, high-ratio conversion (e.g., 24V→3.3V at 2MHz) without pulse-skipping artifacts |
| Exposed die thermal pad | Enables direct heatsink mounting; reduces θJA to 14°C/W on demo board, allowing 15A operation at 70°C ambient |
| Four-mode operation | Selectable via single SYNC/MODE pin: Burst Mode® (low IQ), FCM (fast transients), spread spectrum (EMI reduction), or external sync (system timing coherence) |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C junction operation - suitable for under-hood automotive power supplies |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers image sensor and SoC in forward-facing camera module requiring clean 5V/3A with minimal EMI near RF receivers. IC Role / Device Role / Timing Role: Primary 42V-input buck converter delivering regulated 5V with ultralow radiated emissions per CISPR 25. Use Value: Eliminates need for EMI filters or metal shielding, reducing BOM cost and PCB area while meeting OEM EMC requirements. |
Use Scenario: Supplies 5V/10A to isolated digital I/O channels in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: High-current, wide-input DC/DC regulator supporting 9–36V DC industrial bus with thermal robustness. Use Value: Exposed back pad enables conduction cooling into metal chassis, sustaining full 15A output at 60°C ambient without airflow. |
| Medical Imaging Subsystem | Telecom Remote Radio Unit |
|
Use Scenario: Generates low-noise 3.3V/12A for FPGA and ADCs in portable ultrasound equipment where EMI affects analog front-end SNR. IC Role / Device Role / Timing Role: Silent Switcher 2 buck regulator providing clean, stable rail with <10mVP-P ripple and minimal conducted noise. Use Value: Integrated spread-spectrum mode reduces peak EMI by 10dB, preventing interference with sensitive RF and analog signal paths. |
Use Scenario: Converts 48V backplane to 5V/15A for baseband processing unit in outdoor 5G remote radio head with extended temperature range. IC Role / Device Role / Timing Role: AEC-Q100 qualified buck converter operating reliably from –40°C to +150°C junction temperature. Use Value: Forced continuous mode ensures fast load-step response (<50µs) during bursty 5G data transmission, maintaining voltage regulation. |
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 |
|---|---|---|---|
| LT8645S#PBF | Same Silent Switcher 2 architecture, but rated for 8A max output current and 40V max input; lacks spread-spectrum mode and CLKOUT pin. | Lower current capacity limits use in 12A+ systems; absence of spread-spectrum restricts EMI-critical deployments. | Select LT8645S#PBF only when 8A output suffices and EMI requirements are less stringent than CISPR 25 Class 5. |
| MPQ4333-AEC1 | Monolithic 3.5A buck with AEC-Q100 Grade 1 rating; 3.8–36V input, 2.2MHz fixed frequency; no integrated BST/VIN caps or spread-spectrum. | Not suitable for >5A loads; higher EMI requires additional filtering; no VC pin for loop tuning or current sharing. | Choose MPQ4333-AEC1 for cost-sensitive, lower-current automotive modules where layout space permits external EMI mitigation. |
Compared with LT8645S#PBF and MPQ4333-AEC1, the LT8648SHV#PBF uniquely combines 15A capability, integrated EMI-reduction capacitors, spread-spectrum modulation, and AEC-Q100 Grade 1 qualification-making it the only single-package solution for high-current, ultra-low-EMI automotive power rails.
Availability
LT8648SHV#PBF is available at Aetrix Electronics and suitable for automotive ADAS systems, industrial PLCs, medical imaging subsystems, and telecom remote radio units requiring stable component supply with full AEC-Q100 traceability and long-term production support.
Supply support for LT8648SHV#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8648S/LT8648SP product line was designed specifically for high-current, low-EMI automotive and industrial power conversion-addressing the demand for compact, thermally robust, and EMC-compliant DC/DC solutions in safety-critical environments.
FAQ
What is the maximum junction temperature rating for the LT8648SHV#PBF?
The LT8648SHV#PBF is rated for a maximum junction temperature of 150°C and is AEC-Q100 qualified for Grade 1 automotive operation (–40°C to +150°C). Its exposed die pad enables efficient heat transfer to the PCB or external heatsink, supporting sustained 15A output at elevated ambient temperatures when properly implemented.
Does the LT8648SHV#PBF require external BST and input capacitors?
No-the LT8648SHV#PBF integrates ceramic bypass capacitors for both BST and VIN nodes as part of its Silent Switcher 2 architecture. This eliminates the need for external BST diodes and discrete high-frequency input capacitors, simplifying layout and improving EMI performance without sacrificing efficiency.
How does the SYNC/MODE pin configure operating modes on the LT8648SHV#PBF?
The LT8648SHV#PBF uses the SYNC/MODE pin to select four distinct modes: tie to GND for Burst Mode®, leave floating for forced continuous mode (FCM), tie to INTVCC (≥3V) for spread-spectrum FCM, or drive with an external clock for synchronization. Each mode alters switching behavior, transient response, and EMI profile without requiring firmware or additional components.
Can the LT8648SHV#PBF be used in parallel for higher current output?
Yes-the LT8648SHV#PBF supports current sharing via its VC pin. By connecting VC pins together with small resistors and matching compensation networks, multiple LT8648SHV#PBF units can be configured for interleaved, current-balanced operation-enabling scalable solutions beyond 15A while maintaining thermal and EMI advantages.
What is the purpose of the exposed die pad on the LT8648SHV#PBF package?
The exposed die pad (pins 37–42) on the LT8648SHV#PBF serves as the primary thermal conduction path from the silicon die to the PCB. When soldered to a large copper area or heatsink, it reduces thermal resistance (θJA down to 14°C/W on demo board), enabling full 15A output at high ambient temperatures without forced airflow or derating.
LT8648SHV#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)
LT8648SHV#PBF FAQ
1.How can I place an order for LT8648SHV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8648SHV#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 LT8648SHV#PBF reliable?
The price and inventory of LT8648SHV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8648SHV#PBF is usually 5 days.
3.What payment methods are accepted for LT8648SHV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8648SHV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8648SHV#PBF?
LT8648SHV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8648SHV#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 LT8648SHV#PBF?
For technical support, including LT8648SHV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8648SHV#PBF requirements.
6.How does Aetrix verify that LT8648SHV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8648SHV#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 LT8648SHV#PBF meets industry standards.
7.What is the process for return or replacement of LT8648SHV#PBF?
All LT8648SHV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8648SHV#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 LT8648SHV#PBF part is unused and in its original packaging.
Return procedure for LT8648SHV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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