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Analog Devices Inc. LT8641ARUDCM#TRPBF
- Part No.:
- LT8641ARUDCM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad, 18 Leads
- Datasheet:
-
LT8641ARUDCM#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,052
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Product details
Overview
LT8641ARUDCM#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC regulator with Silent Switcher® architecture, delivering 3.5A continuous / 5A peak output from 3V–65V input, featuring 2.5µA quiescent current in Burst Mode®, 35ns minimum on-time, and <10mVP-P output ripple - deployed in automotive infotainment power rails and industrial sensor node supplies.
For engineers reviewing the LT8641ARUDCM#TRPBF datasheet, LT8641ARUDCM#TRPBF pinout, LT8641ARUDCM#TRPBF application, or LT8641ARUDCM#TRPBF equivalent, key selection criteria include ultralow IQ regulation at light loads, AEC-Q100 qualification, spread spectrum EMI reduction, and true 2MHz operation with 24VIN input compatibility.
Technical Context
The LT8641ARUDCM#TRPBF employs constant-frequency current-mode control with internal top/bottom NMOS switches (105mΩ/55mΩ), programmable switching frequency (200kHz–3MHz via RT resistor), and integrated error amplifier servoing a precise 0.810V feedback reference. Its Silent Switcher® architecture uses symmetrical layout and side-wettable QFN packaging to suppress common-mode EMI without external filters.
Operation modes are selected via SYNC/MODE pin: Burst Mode® (ultralow 2.5µA IQ), pulse-skipping (full-frequency down to light load), spread spectrum modulation (±22% Δf), or external clock synchronization. Soft-start and output tracking are implemented through TR/SS pin with 1.9µA internal current source and 220Ω pull-down during fault.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 65V - supports direct battery connection in 12V/24V/48V automotive and industrial systems without pre-regulation. |
| Output Current | 3.5A continuous, 5A peak - enables single-chip 5V/3.3V conversion for microcontrollers, FPGAs, and imaging sensors. |
| Quiescent Current | 2.5µA in Burst Mode® regulating 12VIN to 3.3VOUT - extends battery life in always-on telematics and ADAS modules. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows compact 2.2µH inductors at 2MHz for space-constrained PCBs. |
| Feedback Reference | 0.810V ±0.006V - ensures ±1% output accuracy over temperature and line/load, critical for ADC reference and precision analog rails. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum enabled - eliminates need for ferrite beads or metal shields in automotive EMC designs. |
| Minimum On-Time | 35ns - enables high-frequency 24VIN-to-3.3VOUT conversion without duty-cycle limitation or external boost. |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C junction) - qualified for engine bay, transmission control, and ADAS camera power applications. |
Pinout & Package
LT8641ARUDCM#TRPBF is housed in an 18-lead 3mm × 4mm side-wettable QFN (UDCM package) with exposed SW pad (Pin 21) soldered directly to the switch node for optimal thermal and EMI performance. The package supports automated optical inspection (AOI) and improves solder joint reliability in automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BIAS) | Internal regulator bias supply | Connect to VOUT for >3.3V outputs to reduce VIN current draw and improve efficiency; bypass with 1µF ceramic if externally biased. |
| 2 (INTVCC) | Internal 3.4V regulator output | Power source for gate drivers and control logic; requires ≥1µF low-ESR ceramic decoupling to GND; no external loading permitted. |
| 3 (BST) | Bootstrap capacitor connection | Drives top NMOS gate above VIN; requires 0.1µF X7R ceramic placed adjacent to IC for stable high-side switching. |
| 4,13 (VIN1/VIN2) | Dual high-current input paths | Each accepts independent 0.1µF input bypass caps; both tied to main input rail - reduces high-frequency loop inductance and EMI. |
| 6,7,10,11 (GND1/GND2) | Power ground return paths | Four dedicated ground pins minimize ground bounce; must be tied together and connected to solid ground plane under IC. |
| 8,9,21 (SW) | Switch node output | High dv/dt node connecting internal NMOS switches to inductor and BST cap; exposed pad (Pin 21) must be soldered to SW trace. |
| 14 (EN/UV) | Enable and input undervoltage lockout | Hysteretic threshold (0.95V–1.07V) enables VIN monitoring; resistor divider from VIN sets custom UVLO point. |
| 15 (RT) | Frequency programming | Resistor to GND sets fSW: 60.4kΩ = 700kHz, 18.2kΩ = 2MHz - enables optimization of size vs. efficiency trade-off. |
| 16 (TR/SS) | Soft-start and output tracking | 1.9µA current source charges external capacitor for controlled VOUT ramp; pulled low during fault for safe shutdown. |
| 17 (SYNC/MODE) | Mode selection and sync input | Ground = Burst Mode®; float = pulse-skip; INTVCC = spread spectrum; external clock = synchronization - no external components needed. |
| 18 (GND) | Signal ground reference | System ground reference for FB, PG, and EN/UV; must connect to same ground plane as GND1/GND2 but not used for power return. |
| 19 (PG) | Open-drain power good | Signals regulation status (±8% of VFB); valid down to 3V VIN; internal 750Ω–2kΩ pull-down enables direct MCU GPIO interface. |
| 20 (FB) | Feedback voltage sense | Regulates to 0.810V; connects to resistor divider from VOUT; 4.7pF phase-lead cap recommended between FB and VOUT for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Integrated dual-input, dual-ground, and symmetrical SW routing suppresses common-mode EMI by >30dB vs. conventional buck regulators. |
| Ultralow Quiescent Current | 2.5µA IQ in Burst Mode® enables >10-year battery life in always-on vehicle event recorders and remote IoT sensors. |
| True 2MHz Operation at 24VIN | 35ns minimum on-time supports 24VIN-to-3.3VOUT conversion at 2MHz without duty-cycle constraint or external boost circuitry. |
| AEC-Q100 Qualified | Grade 1 qualification (−40°C to +125°C TJ) confirms reliability for under-hood automotive applications including ADAS cameras and radar modules. |
| Spread Spectrum Modulation | ±22% triangular frequency dithering reduces peak radiated emissions by up to 15dB, easing CISPR 25 Class 5 compliance without layout changes. |
| Inductor Saturation Tolerance | Safe overload handling up to 5.8A valley current prevents latch-up or damage when inductors saturate during transient overloads or cold cranking. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering 5V/3.3V rails for head unit SoCs, display controllers, and audio codecs in vehicles with wide battery range (6V–16V) and cold-crank dips. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated output with ultralow noise and fast transient response to handle bursty CPU loads. Use Value: 2.5µA quiescent current minimizes parasitic drain during vehicle sleep mode; Silent Switcher® meets strict OEM EMI requirements without shielding. |
Use Scenario: Providing stable 3.3V supply to wireless sensor nodes (LoRaWAN, NB-IoT) operating from 12V–48V industrial power buses with intermittent wake cycles. IC Role / Device Role / Timing Role: High-efficiency step-down converter enabling multi-year battery life via Burst Mode® and low dropout (130mV @ 1A). Use Value: 65V max input withstands 48V bus transients; AEC-Q100 qualification ensures long-term reliability in factory automation environments. |
| ADAS Camera Module Supply | Programmable Logic Power |
Use Scenario: Generating clean 1.2V/1.8V/3.3V rails for CMOS image sensors and ISP processors in rear-view and surround-view cameras exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator with side-wettable QFN and exposed SW pad for efficient heat dissipation near optics. Use Value: 150°C max junction rating and Grade 1 AEC-Q100 support operation at +125°C ambient; <10mVP-P ripple avoids image noise artifacts. |
Use Scenario: Powering FPGA I/O banks and core logic requiring tightly regulated 1.2V/1.8V/3.3V with fast load-step response in test equipment and programmable logic controllers. IC Role / Device Role / Timing Role: High-bandwidth current-mode controller with 35ns min on-time and fast minimum off-time (80ns) for dynamic load handling. Use Value: 5A peak current supports FPGA configuration surges; programmable soft-start (TR/SS) prevents inrush-induced system resets. |
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 |
|---|---|---|---|
| LT8640SIV#PBF | Same architecture, lower 3A continuous rating, 2.2µA IQ, no AEC-Q100 qualification | Targeted at commercial/industrial use only; lacks automotive-grade screening and extended temp validation | Select when AEC-Q100 is unnecessary and cost sensitivity outweighs peak current margin |
| MPQ4420AGL-AEC1-Z | Monolithic 36V/2A buck, 17µA IQ, AEC-Q100 Grade 1, no spread spectrum or Silent Switcher | Lower EMI suppression capability; higher IQ limits battery lifetime in always-on systems | Choose for simpler designs where 2A output suffices and ultra-low EMI is not required |
Compared with LT8641ARUDCM#TRPBF, LT8640SIV#PBF offers lower cost but sacrifices 0.5A continuous output and automotive qualification, while MPQ4420AGL-AEC1-Z provides AEC-Q100 compliance at reduced current and higher quiescent current - making LT8641ARUDCM#TRPBF optimal for high-reliability, high-current, low-EMI automotive power rails.
Availability
LT8641ARUDCM#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial sensor node power supplies requiring stable component supply, AEC-Q100 assurance, and ultralow quiescent current performance.
Supply support for LT8641ARUDCM#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA, with deep expertise in power management and signal integrity.
The LT8641A product line delivers high-efficiency, low-EMI synchronous buck regulators for demanding automotive and industrial applications where reliability, small solution size, and regulatory compliance are critical design constraints.
FAQ
What is the maximum input voltage rating for the LT8641ARUDCM#TRPBF?
The LT8641ARUDCM#TRPBF has an absolute maximum input voltage rating of 65V, with operational functionality guaranteed from 3.0V to 65V. This wide range supports direct connection to 48V industrial buses and automotive batteries experiencing load-dump transients, as confirmed in Table 2 of the official datasheet.
Does the LT8641ARUDCM#TRPBF support external frequency synchronization?
Yes, the LT8641ARUDCM#TRPBF supports external clock synchronization via the SYNC/MODE pin. When driven with a TTL/CMOS-compatible clock signal (0.7V–2.9V logic levels), the device synchronizes its switching frequency to the external source while operating in pulse-skipping mode - a feature explicitly documented in the Pin Descriptions and Theory of Operation sections.
How is the output voltage set on the LT8641ARUDCM#TRPBF?
The LT8641ARUDCM#TRPBF regulates the FB pin to a precise 0.810V reference. Output voltage is set using a resistor divider from VOUT to GND, with the tap connected to FB. For example, a 191kΩ top resistor and 41.2kΩ bottom resistor yields 5.0V output, as shown in Figure 1 of the datasheet.
Is the LT8641ARUDCM#TRPBF qualified for automotive applications?
Yes, the LT8641ARUDCM#TRPBF is AEC-Q100 qualified for automotive applications (Grade 1, −40°C to +125°C junction temperature). This qualification is explicitly stated in the Features and Applications sections and verified across all electrical, thermal, and reliability test conditions defined in the AEC-Q100 standard.
What package type does the LT8641ARUDCM#TRPBF use?
The LT8641ARUDCM#TRPBF uses an 18-lead 3mm × 4mm side-wettable QFN package (UDCM), with an exposed SW pad (Pin 21) that must be soldered to the PCB switch node. This package enables AOI compatibility, improved thermal performance, and enhanced solder joint reliability - details confirmed in the Outline Dimensions and Pin Configurations sections.
LT8641ARUDCM#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 20-WFQFN Exposed Pad, 18 Leads
- 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):
- 2.6V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 0.81V
- Voltage - Output (Max):
- 65V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-QFN (3x4)
LT8641ARUDCM#TRPBF FAQ
1.How can I place an order for LT8641ARUDCM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8641ARUDCM#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 LT8641ARUDCM#TRPBF reliable?
The price and inventory of LT8641ARUDCM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8641ARUDCM#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8641ARUDCM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8641ARUDCM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8641ARUDCM#TRPBF?
LT8641ARUDCM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8641ARUDCM#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 LT8641ARUDCM#TRPBF?
For technical support, including LT8641ARUDCM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8641ARUDCM#TRPBF requirements.
6.How does Aetrix verify that LT8641ARUDCM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8641ARUDCM#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 LT8641ARUDCM#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8641ARUDCM#TRPBF?
All LT8641ARUDCM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8641ARUDCM#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 LT8641ARUDCM#TRPBF part is unused and in its original packaging.
Return procedure for LT8641ARUDCM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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