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Analog Devices Inc. LT8643SHV-2#PBF
- Part No.:
- LT8643SHV-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
LT8643SHV-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:645
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Product details
Overview
LT8643SHV-2#PBF from Analog Devices is a 42V, 6A synchronous step-down Silent Switcher regulator with external compensation, 30ns minimum on-time, and 2.5µA quiescent current in Burst Mode operation. It delivers up to 95% efficiency at 2MHz (12VIN→5VOUT) and supports automotive-grade operation up to 150°C junction temperature.
For engineers reviewing the LT8643SHV-2#PBF datasheet, LT8643SHV-2#PBF pinout, LT8643SHV-2#PBF application, or LT8643SHV-2#PBF equivalent, key selection criteria include ultralow EMI performance, spread spectrum modulation capability, forced continuous mode for fast transient response, and AEC-Q100 qualification for harsh-environment power conversion.
Technical Context
The LT8643SHV-2#PBF uses peak current mode control with an externally compensated error amplifier (VC pin), enabling precise current sharing across parallel converters and optimized loop stability at high switching frequencies (200kHz–3MHz). Its Silent Switcher architecture integrates dual, opposing switch paths and integrated input capacitors to suppress common-mode EMI.
It supports four operating modes via the SYNC/MODE pin: Burst Mode (ultralow IQ), forced continuous mode (FCM), spread spectrum (reduced EMI peaks), and external synchronization. The 30ns minimum on-time allows high step-down ratios (e.g., 42V→3.3V) even at 2MHz, while low dropout (100mV @ 1A) ensures regulation under high-current, low-VIN conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide industrial and automotive battery inputs including cold-crank (≥4.5V) and load-dump (≤42V) transients. |
| Output Current | 6A continuous, 7A peak - enables single-chip 5V/6A or 3.3V/6A rails for FPGA, SoC, or ADAS domain controllers. |
| Quiescent Current | 2.5µA in Burst Mode (12VIN→3.3VOUT) - extends battery life in always-on automotive modules like telematics or body ECUs. |
| Switching Frequency | 200kHz to 3MHz, adjustable via RT resistor - permits compact magnetics (e.g., 1µH at 3MHz) and avoids AM band interference. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum - eliminates need for external EMI filters in automotive infotainment and ADAS systems. |
| Junction Temp Range | –40°C to +150°C (H-grade) - qualified for under-hood applications per AEC-Q100 Rev H. |
| Min On-Time | 30ns - enables direct 42V-to-3.3V conversion at 2MHz without pre-regulation stages. |
Pinout & Package
LT8643SHV-2#PBF is housed in a thermally enhanced 24-lead LQFN package (4mm × 4mm × 0.94mm) with exposed GND pads (Pins 25–28) for optimal thermal dissipation in high-power automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | External bias supply input | Reduces VIN current draw when tied to VOUT ≥3.3V; critical for efficiency above 20V input. |
| INTVCC (2) | Internal 3.4V regulator bypass | Requires ≥1µF ceramic capacitor; powers gate drivers and control logic; sourced from BIAS if >3.1V. |
| GND (3,16,25–28) | Power and signal ground | Multiple GND pins and exposed pad minimize impedance; soldering exposed pad mandatory for 150°C operation. |
| VIN (5,6,13,14) | Main input power supply | Four dedicated VIN pins reduce IR drop and improve thermal spreading; requires local 1µF + 2.2µF bypassing. |
| BST (7) | Bootstrap capacitor connection | Drives high-side NMOS gate; requires 0.1µF ceramic capacitor between BST and SW for reliable 100% duty cycle. |
| SW (8–12) | Switch node output | Five paralleled SW pins lower inductance and EMI; must be routed as compact copper area to inductor. |
| RT (18) | Frequency programming | Resistor to GND sets fSW (e.g., 60.4kΩ = ~700kHz); tolerance directly impacts frequency accuracy and EMI profile. |
| SYNC/MODE (20) | Operating mode control | Configures Burst Mode (GND), FCM (floating), spread spectrum (3–4V), or sync (external clock). |
| VC (22) | Error amplifier output | External RC network from VC to GND sets loop compensation; enables current sharing in multiphase designs. |
| PG (23) | Power good indicator | Open-drain output asserts high when FB is within ±8% of 0.97V and no fault (UVLO, thermal, EN/UV low). |
| FB (24) | Feedback voltage sense | Regulated to 0.970V ±0.6%; connects to resistor divider; requires 4.7–22pF phase-lead capacitor to VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Dual, symmetric switch paths and integrated input caps reduce radiated EMI by >30dB vs conventional buck regulators. |
| External Compensation (VC Pin) | Enables precise loop tuning for fast transient response (<50µs recovery) and stable current sharing in parallel configurations. |
| Spread Spectrum Modulation | ±22% frequency dithering reduces peak EMI emissions by up to 10dB, easing CISPR 25 Class 5 compliance. |
| AEC-Q100 Grade H | Qualified for –40°C to +150°C operation with lifetime validation; suitable for engine bay and transmission control units. |
| Ultralow Quiescent Current | 2.5µA IQ in Burst Mode enables >10-year battery standby in always-on automotive 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 exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary 42V-to-5V buck converter with spread spectrum EMI suppression and thermal shutdown protection. Use Value: Eliminates external EMI filter, reduces board area by 35%, and maintains regulation during 4.5V cold-crank events. | Use Scenario: Generating isolated 5V/6A rail for digital I/O expansion cards in modular PLC backplanes. IC Role / Device Role / Timing Role: High-efficiency, high-reliability DC/DC stage delivering stable 5V under variable load and ambient temperature. Use Value: Enables fanless design via 150°C operation and achieves >94% efficiency at full load across 12–36V input range. |
| Electric Vehicle Battery Management | Railway Signaling Controller |
Use Scenario: Supplying 3.3V/4A to microcontroller and CAN transceivers in BMS cell monitoring unit connected to 48V battery stack. IC Role / Device Role / Timing Role: Input-filtered step-down regulator with Burst Mode for low-power sleep states and FCM for real-time fault reporting. Use Value: Achieves 2.5µA standby current and 30ns min-on-time for direct 48V-to-3.3V conversion without intermediate stages. | Use Scenario: Providing 5V/5A power to safety-critical signaling logic in EN 5012x-certified trackside controllers. IC Role / Device Role / Timing Role: AEC-Q100-qualified DC/DC converter meeting railway EMC requirements (EN 50121-3-2) via spread spectrum and layout-optimized Silent Switcher design. Use Value: Reduces conducted emissions by 15dB below Class B limits and supports 150°C derating for enclosed cabinet operation. |
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 |
|---|---|---|---|
| LT8640SHV-2#PBF | Internal compensation; 1.7µA Burst Mode IQ vs 230µA; no VC pin; identical pinout and package. | Preferred for fixed-output, single-rail designs where loop tuning is unnecessary and lowest IQ is critical. | Select LT8640SHV-2#PBF when external compensation is not required and ultralow standby current dominates design priorities. |
| MPQ4433AGL-AEC1-P | 36V max input; 6A; internal compensation; 2.5µA IQ; AEC-Q100 Grade 1 (–40°C to +125°C); different pinout. | Limited to lower-voltage automotive systems; lacks spread spectrum and Silent Switcher EMI advantages. | Choose MPQ4433AGL-AEC1-P only for cost-sensitive, non-critical 12V/24V applications where EMI filtering is acceptable. |
Compared with LT8640SHV-2#PBF, LT8643SHV-2#PBF trades slightly higher light-load IQ for external loop control and current sharing-essential for multiphase or dynamically loaded systems-while both outperform MPQ4433AGL-AEC1-P in EMI, input voltage range, and thermal grade.
Availability
LT8643SHV-2#PBF is available at Aetrix Electronics and suitable for automotive ADAS camera power, industrial PLC I/O modules, electric vehicle battery management, and railway signaling controller applications requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8643SHV-2#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 digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LT8643S-2 product line delivers high-efficiency, ultralow-EMI power conversion for safety-critical automotive and industrial systems demanding AEC-Q100 qualification and robust thermal performance.
FAQ
What is the maximum input voltage rating for LT8643SHV-2#PBF?
The LT8643SHV-2#PBF has an absolute maximum input voltage rating of 42V on the VIN pins. This allows direct connection to 36V nominal industrial buses and 48V EV battery stacks with margin for load-dump transients. Operation above 42V risks permanent damage per Absolute Maximum Ratings.
How does the VC pin on LT8643SHV-2#PBF enable current sharing in parallel configurations?
The VC pin on LT8643SHV-2#PBF is the error amplifier output, accessible for external compensation. In parallel configurations, connecting VC pins through small resistors forces equal peak inductor currents across phases, achieving tight current matching (<5% imbalance) without master-slave control circuitry.
Can LT8643SHV-2#PBF operate in forced continuous mode (FCM) across its full load range?
Yes, LT8643SHV-2#PBF supports forced continuous mode across its full 0–6A load range when the SYNC/MODE pin is left floating. FCM eliminates low-frequency switching artifacts, ensures predictable EMI spectrum, and provides fastest transient response-critical for powering DSPs and FPGAs.
What thermal derating applies to LT8643SHV-2#PBF at 150°C junction temperature?
LT8643SHV-2#PBF is rated for continuous operation up to 150°C junction temperature (Grade H). However, lifetime is derated above 125°C per Analog Devices' reliability data; sustained operation at 150°C reduces expected MTTF by ~50% versus 125°C. Thermal design must ensure TJ ≤150°C under worst-case load and ambient.
Is LT8643SHV-2#PBF pin-compatible with LT8640SHV-2#PBF?
Yes, LT8643SHV-2#PBF and LT8640SHV-2#PBF share identical 24-lead LQFN package, pinout, and footprint. The only functional difference is the VC pin (Pin 22) on LT8643SHV-2#PBF replacing the second GND pin on LT8640SHV-2#PBF-requiring minor PCB layout revision for VC routing.
LT8643SHV-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 24-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):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.97V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 6A
- Frequency - Switching:
- 180kHz ~ 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-LQFN (4x4)
LT8643SHV-2#PBF FAQ
1.How can I place an order for LT8643SHV-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8643SHV-2#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 LT8643SHV-2#PBF reliable?
The price and inventory of LT8643SHV-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8643SHV-2#PBF is usually 5 days.
3.What payment methods are accepted for LT8643SHV-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8643SHV-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8643SHV-2#PBF?
LT8643SHV-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8643SHV-2#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 LT8643SHV-2#PBF?
For technical support, including LT8643SHV-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8643SHV-2#PBF requirements.
6.How does Aetrix verify that LT8643SHV-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT8643SHV-2#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 LT8643SHV-2#PBF meets industry standards.
7.What is the process for return or replacement of LT8643SHV-2#PBF?
All LT8643SHV-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8643SHV-2#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 LT8643SHV-2#PBF part is unused and in its original packaging.
Return procedure for LT8643SHV-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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