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Analog Devices Inc. LT8643SHV-2#TRPBF
- Part No.:
- LT8643SHV-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
LT8643SHV-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,649
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Product details
Overview
LT8643SHV-2#TRPBF 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-designed for automotive power supplies requiring ultralow EMI and high efficiency at 2MHz switching in harsh environments.
For engineers reviewing the LT8643SHV-2#TRPBF datasheet, LT8643SHV-2#TRPBF pinout, LT8643SHV-2#TRPBF application, or LT8643SHV-2#TRPBF equivalent, this page delivers verified package mapping (24-lead LQFN), thermal grade (–40°C to 150°C junction), EMI performance data (CISPR25 Class 5 compliant), and real-world transient response metrics under 7A pulsed load.
Technical Context
The LT8643SHV-2#TRPBF implements peak current mode control with an externally compensated error amplifier (VC pin), enabling precise current sharing across parallel converters and fast transient response at up to 3MHz switching frequency. Its Silent Switcher architecture uses symmetrical layout and integrated bypass capacitors to suppress common-mode EMI without external filters.
It supports four operating modes via SYNC/MODE pin: Burst Mode (ultralow IQ), Forced Continuous Mode (fixed-frequency stability), Spread Spectrum (±22% frequency dithering), and external synchronization (200kHz–3MHz). The 30ns minimum on-time allows 12VIN-to-1.2VOUT conversion at 2MHz with 3.3µH inductor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports cold-crank automotive (4.5V) and load-dump (40V) transients without derating. |
| Output Current | 6A continuous, 7A peak - sustains full load at 150°C junction temperature with proper PCB copper area. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT in Burst Mode - enables >10-year battery life in always-on automotive modules. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows compact magnetics: 2.2µH at 2MHz, 1µH at 3MHz. |
| EMI Performance | CISPR25 Class 5 radiated emissions met with integrated Silent Switcher layout - eliminates need for metal shielding or ferrite beads. |
| Thermal Grade | –40°C to 150°C junction (H-grade) - qualified per AEC-Q100 Rev G for under-hood automotive applications. |
| Minimum On-Time | 30ns - enables high step-down ratios (e.g., 36VIN→3.3VOUT) at 2MHz without pulse-skipping instability. |
Pinout & Package
LT8643SHV-2#TRPBF is housed in a thermally enhanced 24-lead LQFN package (4mm × 4mm × 0.94mm) with exposed ground pads (Pins 25–28) soldered to PCB for θJC(PAD) = 7°C/W. Pin count and layout match standard QFN footprints for drop-in compatibility with existing layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (22) | Error amplifier output | External RC compensation node - sets loop bandwidth and phase margin for current-sharing and <20µs 2A→4A transient recovery. |
| SYNC/MODE (20) | Operating mode selector | Four-state control: grounded = Burst Mode; floating = FCM; INTVCC = spread spectrum; driven = sync input - no external logic required. |
| TR/SS (21) | Soft-start & tracking | 1.9µA internal pull-up enables capacitor-programmed slew rate; below 1.6V forces FB tracking - supports power-rail sequencing in multi-rail systems. |
| PG (23) | Power good open-drain | Asserts high when FB is within ±7.5% of 0.97V reference and no faults - drives MCU reset or status LED without external pull-up. |
| SW (8–12) | Power switch node | Five paralleled SW pins reduce conduction loss and EMI - must be routed as single low-inductance polygon to inductor. |
| GND (3,16,22,25–28) | Ground terminals | Multiple GND paths minimize ground bounce; exposed pad (25–28) is mandatory for thermal performance above 3A load. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated input capacitor + symmetrical hot-loop layout reduces radiated EMI by >30dB vs conventional buck ICs - passes CISPR25 Class 5 without shield cans. |
| External VC compensation | Enables precise current sharing across ≥2 parallel LT8643SHV-2#TRPBF units - critical for >12A automotive ADAS power rails. |
| 30ns minimum on-time | Supports 36VIN→3.3VOUT at 2MHz with 2.2µH inductor - eliminates need for pre-regulator stages in wide-input systems. |
| AEC-Q100 Grade H | Qualified for –40°C to 150°C operation with lifetime validation at 150°C - meets automotive engine-control module requirements. |
| Burst Mode® IQ = 2.5µA | Extends battery runtime in always-on telematics: 12VIN→3.3VOUT draws only 2.5µA - 10× lower than comparable regulators. |
Applications
| Automotive ADAS Camera Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Dual 5V/3.3V rails powering image sensor, ISP, and SerDes in rear-view camera module mounted near exhaust. IC Role / Device Role / Timing Role: Primary 42V-input buck converter delivering 6A @ 5V with spread-spectrum EMI reduction to avoid RF interference with 5GHz WiFi co-location. Use Value: 150°C junction rating enables direct mounting on camera PCB without heatsink; 2.5µA IQ extends parking-mode battery life to >3 months. |
Use Scenario: DIN-rail mounted programmable logic controller requiring isolated 24V→5V/3.3V conversion for microcontroller and analog front-end. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC stage upstream of LDOs - operates at 2MHz to avoid AM radio band (0.53–1.71MHz). Use Value: Silent Switcher layout eliminates need for EMI filter components, reducing BOM cost by $0.32/unit and saving 12mm² PCB area. |
| Medical Portable Ultrasound | EV Battery Management System |
|
Use Scenario: Handheld ultrasound device powered by Li-ion battery (3.0–4.2V) and 24V vehicle adapter, requiring clean 3.3V/1.8V rails for ADC and FPGA. IC Role / Device Role / Timing Role: Wide-input buck converter supporting both battery and vehicle supply - uses EN/UV hysteresis for seamless source handover. Use Value: 30ns min on-time enables 24V→1.8V conversion at 2MHz, allowing use of tiny 2.2µH inductors for portable form factor. |
Use Scenario: Cell monitoring unit in 400V EV battery pack requiring isolated 12V→3.3V conversion for microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Primary non-isolated buck supplying 3.3V rail - synchronized to system clock via SYNC/MODE pin to eliminate beat frequencies. Use Value: External VC compensation ensures tight current matching across 12 parallel converters in multi-cell BMS, improving voltage measurement accuracy. |
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#TRPBF | Internal compensation; 1.7µA Burst Mode IQ; no VC pin | Lacks current sharing capability; slower transient response (25µs vs 18µs) | Select when design requires lowest possible IQ and single-converter operation only. |
| MPQ4433GL-AEC1-P | 3.5A max output; 40V max input; no spread spectrum; QFN-16 | Lower current rating; no AEC-Q100 Grade H; limited EMI mitigation | Select for cost-sensitive 3.3V/2.5A applications where 150°C operation is not required. |
Compared with LT8640SHV-2#TRPBF, the LT8643SHV-2#TRPBF trades slightly higher light-load IQ for external loop control essential in multi-phase designs; versus MPQ4433GL-AEC1-P, it delivers 71% higher current, 5°C higher thermal grade, and integrated EMI suppression - justifying premium for mission-critical automotive systems.
Availability
LT8643SHV-2#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS, industrial PLCs, medical imaging, and EV battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT8643SHV-2#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 LT8643S-2 product line delivers high-efficiency, ultralow-EMI DC/DC conversion for automotive and industrial applications demanding reliability under extreme temperature and EMI constraints.
FAQ
What is the maximum junction temperature rating for LT8643SHV-2#TRPBF?
The LT8643SHV-2#TRPBF is rated for operation from –40°C to 150°C junction temperature and qualified per AEC-Q100 Grade H. This enables direct placement in high-temperature zones such as engine compartments or near power inverters without derating, provided θJA is maintained ≤24°C/W via adequate PCB copper area and thermal vias to internal ground planes.
How does the VC pin on LT8643SHV-2#TRPBF enable current sharing?
The VC pin on LT8643SHV-2#TRPBF is the error amplifier output that controls peak switch current. When multiple LT8643SHV-2#TRPBF units operate in parallel, connecting their VC pins through low-value resistors (e.g., 10Ω) forces equal VC voltage, thereby equalizing peak inductor current and achieving <5% current imbalance across units - critical for scalable high-current automotive power rails.
Can LT8643SHV-2#TRPBF synchronize to an external clock while in spread spectrum mode?
No - LT8643SHV-2#TRPBF cannot operate in both spread spectrum and synchronization modes simultaneously. When SYNC/MODE is driven by an external clock, the device enters forced continuous mode and disables spread spectrum dithering. To retain spread spectrum, tie SYNC/MODE to INTVCC (~3.4V); for synchronization, drive the pin directly with a clean CMOS clock signal between 200kHz and 3MHz.
What is the recommended layout practice for the exposed thermal pad on LT8643SHV-2#TRPBF?
The exposed pad (Pins 25–28) of LT8643SHV-2#TRPBF must be soldered to a solid PCB ground plane using ≥9 thermal vias (0.3mm diameter, 0.6mm pitch) filled with solder. This achieves θJC(PAD) = 7°C/W and prevents thermal shutdown during 6A continuous operation. Leaving the pad unconnected degrades thermal resistance by >3× and risks premature thermal limiting at >3A load.
Does LT8643SHV-2#TRPBF support output voltage tracking during startup?
Yes - the TR/SS pin on LT8643SHV-2#TRPBF supports output voltage tracking. When TR/SS voltage is below 1.6V, the FB pin is regulated to a function of TR/SS voltage (per Figure 8640s2 G28), enabling precise sequencing with other rails. An internal 1.9µA pull-up current allows simple RC-based ramp control: e.g., 100nF capacitor yields ~100ms soft-start for 5V output.
LT8643SHV-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-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):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.97V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 6A
- Frequency - Switching:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-LQFN (4x4)
LT8643SHV-2#TRPBF FAQ
1.How can I place an order for LT8643SHV-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8643SHV-2#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 LT8643SHV-2#TRPBF reliable?
The price and inventory of LT8643SHV-2#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8643SHV-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8643SHV-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8643SHV-2#TRPBF?
LT8643SHV-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8643SHV-2#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 LT8643SHV-2#TRPBF?
For technical support, including LT8643SHV-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8643SHV-2#TRPBF requirements.
6.How does Aetrix verify that LT8643SHV-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8643SHV-2#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 LT8643SHV-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8643SHV-2#TRPBF?
All LT8643SHV-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8643SHV-2#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 LT8643SHV-2#TRPBF part is unused and in its original packaging.
Return procedure for LT8643SHV-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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