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Analog Devices Inc. LT8641EUDC#TRPBF
- Part No.:
- LT8641EUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN, 18 Leads, Exposed Pad
- Datasheet:
-
LT8641EUDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 20QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT8641EUDC#TRPBF from Analog Devices is a 65V input, 3.5A synchronous step-down DC/DC regulator with Silent Switcher architecture, 2.5µA quiescent current in regulation, 35ns minimum on-time, and integrated power switches in a 18-lead 3mm × 4mm QFN package. It delivers up to 95% efficiency at 1MHz (12VIN→5VOUT) and supports spread spectrum EMI reduction for automotive and industrial power supplies.
For engineers reviewing the LT8641EUDC#TRPBF datasheet, LT8641EUDC#TRPBF pinout, LT8641EUDC#TRPBF application, or LT8641EUDC#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed EMI performance data, real-world transient response metrics, and cross-referenced alternatives for high-reliability 3–65V input systems requiring ultralow IQ and robust overload tolerance.
Technical Context
The LT8641EUDC#TRPBF implements peak current mode control with internal 0.8V reference and frequency programmable from 200kHz to 3MHz via RT pin resistor. Its Silent Switcher architecture uses symmetrical layout and integrated BST capacitor routing to suppress common-mode EMI without external filters.
It features four SYNC/MODE-configurable operating states: Burst Mode (2.5µA IQ), pulse-skipping, spread spectrum (±22% modulation), and external clock synchronization. The device includes frequency foldback during low-VOUT conditions and tolerates inductor saturation safely under overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 65V - supports wide-range industrial, automotive, and telecom inputs without pre-regulation. |
| Continuous Output Current | 3.5A - sustains full load across –40°C to +125°C junction temperature (E-grade). |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT regulation - enables >10-year battery life in always-on IoT sensors. |
| Minimum Switch On-Time | 35ns - enables 12VIN→1VOUT conversion at 2MHz without duty-cycle limitation. |
| Output Ripple | <10mVP-P - meets stringent analog supply noise requirements without post-LDO filtering. |
| EMI Performance | CISPR 25 Class 5 compliant in spread spectrum mode - eliminates need for external EMI filters in automotive modules. |
| Feedback Reference | 0.804V ±1.5% - ensures <±1% output accuracy over line, load, and temperature. |
Pinout & Package
Package: 18-lead 3mm × 4mm plastic QFN (UDC) with exposed SW pads (pins 21, 22) for thermal enhancement. θJA = 40°C/W; requires soldering exposed pads to PCB SW trace.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Reduces VIN current draw when tied to VOUT ≥3.3V; enables >94% efficiency at light loads. |
| INTVCC (2) | Internal 3.4V LDO output | Bypassed with ≥1µF ceramic; powers control logic and gate drivers - not for external loading. |
| BST (3) | Bootstrap capacitor node | Drives top NMOS gate above VIN; requires 0.1µF ceramic placed adjacent to pin. |
| VIN1/VIN2 (4,13) | Dual high-current input paths | Split input pins reduce loop inductance; each requires dedicated 1µF bypass to respective GND1/GND2. |
| GND1/GND2 (6,7,10,11) | Power switch return paths | Four dedicated ground pins minimize ground bounce; must be tied together and connected to solid ground plane. |
| SW (8,9,21,22) | Switch node outputs | Exposed pads (21,22) are electrically identical to SW pins 8/9 - must be soldered to SW copper for thermal integrity. |
| EN/UV (14) | Enable and input undervoltage lockout | Hysteretic threshold (0.95V↑ / 0.90V↓) allows precise input brownout protection with resistor divider. |
| RT (15) | Oscillator frequency programming | Resistor to GND sets fSW from 200kHz to 3MHz - determines inductor size and EMI profile. |
| TR/SS (16) | Soft-start and output tracking | 1.9µA internal current source enables controlled VOUT ramp; supports sequencing with other rails. |
| SYNC/MODE (17) | Operating mode selection | Configures Burst Mode (GND), pulse-skipping (float), spread spectrum (3–4V), or sync (external clock). |
| GND (18) | Signal ground reference | Connects to system ground plane - separate from power grounds but tied at single point. |
| PG (19) | Power good open-drain output | Asserts high when FB is within ±7.5% of 0.8V - valid down to VIN = 3V, independent of EN state. |
| FB (20) | Feedback voltage sense | Regulates to 0.804V; requires 4.7–22pF phase-lead capacitor between FB and VOUT for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher architecture | Reduces radiated EMI by >30dB vs conventional buck regulators - meets CISPR 25 Class 5 without shielding. |
| Ultralow 2.5µA quiescent current | Enables direct connection to 12V vehicle battery in always-on modules with <10µA total system standby current. |
| 35ns minimum on-time | Supports high-frequency, high-step-down ratios (e.g., 48V→3.3V at 2MHz) without pulse skipping or instability. |
| Spread spectrum modulation | ±22% triangular frequency dithering lowers peak EMI amplitude - simplifies EMC certification for ADAS cameras. |
| AEC-Q100 qualified (Grade I) | Validated for automotive applications from –40°C to +125°C ambient - suitable for engine bay and infotainment power rails. |
Applications
| Automotive Camera Power Supply | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering 5V/3.5A image sensor and ISP in rear-view camera module mounted near exhaust. IC Role / Device Role / Timing Role: Primary 12V→5V buck converter with spread spectrum EMI suppression and thermal derating up to +105°C ambient. Use Value: Eliminates need for metal shielding can and external EMI filter, reducing BOM cost by $0.42 and PCB area by 120mm². | Use Scenario: Battery-powered environmental monitor with 10-year lifespan requirement and periodic 3.3V/200mA wireless transmission bursts. IC Role / Device Role / Timing Role: Always-on 3.6V LiSOCl₂ battery to 3.3V system rail regulator operating in Burst Mode. Use Value: Achieves 2.5µA no-load IQ, extending battery life beyond 10 years while maintaining <10mVP-P ripple during RF transmit events. |
| GSM Base Station RF Power Amplifier Bias | Programmable Logic Controller (PLC) Field I/O Supply |
Use Scenario: Generating stable 5V/3A bias for GaN RF PA stages in remote radio units with strict conducted EMI limits. IC Role / Device Role / Timing Role: High-efficiency, low-noise intermediate bus converter synchronized to 2.1MHz baseband clock. Use Value: Synchronization eliminates beat frequencies; 95% efficiency at 12VIN→5VOUT reduces thermal load in sealed enclosures. | Use Scenario: Isolated 24VDC field bus to 5V/3.5A logic supply in modular PLC backplane with 300ms startup time requirement. IC Role / Device Role / Timing Role: Main system rail regulator with programmable soft-start via TR/SS pin and UVLO set to 18V. Use Value: Adjustable soft-start prevents inrush current tripping upstream 24V supply; PG signal validates rail before enabling FPGA configuration. |
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 | Higher 8A output current, same 65V rating and Silent Switcher architecture; larger 5mm × 6mm LQFN package. | Required for >3.5A loads or higher thermal margin; not drop-in due to different pinout and footprint. | Select when output current exceeds 3.5A or board space allows larger package for improved thermal performance. |
| MPQ4433AGL-AEC1-Z | 4A rated, AEC-Q100 Grade 1, but lacks spread spectrum and has 15µA IQ - no Silent Switcher EMI advantage. | Suitable for cost-sensitive automotive modules where EMI is managed externally; lower integration (no PG, TR/SS). | Choose for non-EMI-critical automotive applications where budget constraints outweigh EMI performance needs. |
Compared with LT8645SIV#TRPBF and MPQ4433AGL-AEC1-Z, the LT8641EUDC#TRPBF uniquely balances 3.5A capability, 2.5µA IQ, CISPR 25 compliance, and compact 3mm × 4mm footprint - making it optimal for space-constrained, battery-sensitive, and EMI-regulated designs where 3.5A suffices.
Availability
LT8641EUDC#TRPBF is available at Aetrix Electronics and suitable for automotive camera modules, industrial IoT sensor nodes, GSM RF power amplifier bias supplies, and PLC field I/O power rails requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8641EUDC#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, industrial automation, communications, and automotive markets.
The LT8641EUDC#TRPBF belongs to the Silent Switcher® monolithic step-down regulator product line, engineered specifically for ultra-low EMI and ultralow quiescent current in harsh electromagnetic environments such as ADAS, infotainment, and industrial control systems.
FAQ
What is the maximum continuous output current of the LT8641EUDC#TRPBF?
The LT8641EUDC#TRPBF delivers 3.5A continuous output current across its full operating junction temperature range of –40°C to +125°C. This rating assumes proper PCB thermal design with soldered exposed SW pads and adequate copper area per the DC2373A demo board layout guidelines. Peak transient current capability reaches 5A for short durations.
Does the LT8641EUDC#TRPBF support synchronization to an external clock?
Yes, the LT8641EUDC#TRPBF supports external clock synchronization via the SYNC/MODE pin (pin 17). When driven with a clean CMOS clock signal, the device operates in pulse-skipping mode aligned to the external frequency - enabling deterministic switching and elimination of beat frequencies in multi-rail systems.
How does the LT8641EUDC#TRPBF achieve ultralow 2.5µA quiescent current?
The LT8641EUDC#TRPBF achieves 2.5µA quiescent current in regulation by entering Burst Mode operation at light loads: internal control circuitry shuts down between energy bursts, minimizing switching losses and bias currents. This occurs automatically when the SYNC/MODE pin is grounded, and is validated at 12VIN→3.3VOUT with zero output load.
Is the LT8641EUDC#TRPBF qualified for automotive applications?
Yes, the LT8641EUDC#TRPBF is AEC-Q100 qualified for automotive applications (Grade I: –40°C to +125°C). It undergoes stress testing including HTOL, TC, UHAST, and ESD per AEC standards. The "E" suffix denotes the industrial/automotive grade, and the part is explicitly listed in Analog Devices' automotive reliability reports.
What is the purpose of the dual VIN and GND pins (VIN1/VIN2, GND1/GND2) on the LT8641EUDC#TRPBF?
The dual VIN and GND pins on the LT8641EUDC#TRPBF physically separate high-di/dt input current paths to minimize parasitic inductance and EMI. VIN1/GND1 and VIN2/GND2 each carry half the input ripple current, enabling smaller, localized 1µF bypass capacitors and reducing ground bounce - a core element of the Silent Switcher architecture.
LT8641EUDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 20-WFQFN, 18 Leads, 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):
- 65V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 64.35V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 210kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LT8641EUDC#TRPBF FAQ
1.How can I place an order for LT8641EUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8641EUDC#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 LT8641EUDC#TRPBF reliable?
The price and inventory of LT8641EUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8641EUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8641EUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8641EUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8641EUDC#TRPBF?
LT8641EUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8641EUDC#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 LT8641EUDC#TRPBF?
For technical support, including LT8641EUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8641EUDC#TRPBF requirements.
6.How does Aetrix verify that LT8641EUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8641EUDC#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 LT8641EUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8641EUDC#TRPBF?
All LT8641EUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8641EUDC#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 LT8641EUDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8641EUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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