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Analog Devices Inc. LT8640SEV#TRPBF
- Part No.:
- LT8640SEV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
LT8640SEV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,487
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Product details
Overview
LT8640SEV#TRPBF from Analog Devices is a 42V, 6A synchronous step-down Silent Switcher 2 regulator with 2.5µA quiescent current in Burst Mode, 30ns minimum on-time, internal compensation, and integrated bypass capacitors for ultralow EMI. It operates from 3.4V to 42V input, delivers up to 6A continuous output, and targets noise-sensitive automotive and industrial power supplies.
For engineers reviewing the LT8640SEV#TRPBF datasheet, LT8640SEV#TRPBF pinout, LT8640SEV#TRPBF application, or LT8640SEV#TRPBF equivalent, key selection criteria include EMI performance in compact layouts, ultralow IQ for battery-backed systems, forced continuous mode for transient-critical loads, spread spectrum capability, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8640SEV#TRPBF uses second-generation Silent Switcher 2 architecture with integrated VIN/BST/INTVCC bypass capacitors to minimize radiated EMI without external layout sensitivity. Its peak current mode control supports high step-down ratios at 200kHz–3MHz switching frequencies.
Burst Mode operation enables 2.5µA IQ regulating 12VIN to 3.3VOUT; forced continuous mode (FCM) ensures fast transient response and harmonic control across full load range; spread spectrum modulation further reduces EMI peaks. Internal compensation eliminates external RC network requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide-range industrial and automotive battery inputs including cold-crank and load-dump conditions. |
| Output Current | 6A continuous, 7A peak - sufficient for powering FPGA cores, DSPs, or multi-rail subsystems from single-stage conversion. |
| Quiescent Current | 2.5µA in Burst Mode (12VIN→3.3VOUT) - enables >1-year battery life in always-on sensor nodes or telematics modules. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows optimization of size vs. efficiency: 2MHz enables <3mm² inductor footprint. |
| Min On-Time | 30ns - supports 12VIN→1VOUT conversion at 2MHz without pulse-skipping instability. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum - eliminates need for external EMI filters in automotive infotainment and ADAS designs. |
| Package | 24-lead 4mm × 4mm LQFN - thermally enhanced with exposed GND pads (θJC = 7°C/W) for high-power density PCBs. |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C junction) - qualified for engine bay, transmission control, and ADAS camera power rails. |
Pinout & Package
LT8640SEV#TRPBF is housed in a 24-lead LQFN package (4mm × 4mm × 0.94mm) with exposed thermal pad (pins 25–28, GND). The package matches standard QFN footprints and supports JEDEC-compliant reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Connect to VOUT (≥3.3V) to reduce VIN current draw and improve light-load efficiency; bypass with 1µF if using external supply. |
| INTVCC (2) | Internal 3.4V regulator output | Must be left floating; powers internal logic and gate drivers; sourced from BIAS if >3.1V, else from VIN. |
| GND (3, 16, 25–28) | Power and signal ground reference | Multiple low-inductance GND connections required; exposed pad must be soldered to PCB plane for thermal integrity (θJA = 24°C/W on demo board). |
| VIN (5, 6, 13, 14) | Main input power supply | Four parallel pins reduce IR drop and EMI; must be tied together and bypassed with ≥2.2µF ceramic capacitor placed adjacent to pins. |
| BST (7) | Bootstrap capacitor connection | Connect 0.22µF ceramic between BST and SW; floating pin - no external drive or loading permitted. |
| SW (8–12) | Switch node output | Five parallel SW pins reduce trace inductance; connect directly to inductor; keep node area minimal to suppress EMI. |
| EN/UV (17) | Enable and undervoltage lockout | Hysteretic threshold (0.96V/1.00V) enables programmable input UVLO via resistor divider from VIN. |
| RT (18) | Frequency setting resistor | Resistor to GND sets fSW: 221kΩ = 210kHz, 60.4kΩ = 700kHz, 18.2kΩ = 1.95MHz - enables precise EMI band avoidance. |
| CLKOUT (19) | Switching frequency monitor | Outputs ~200ns pulses at fSW in FCM/spread-spectrum/sync modes; low in Burst Mode; useful for system clock synchronization. |
| SYNC/MODE (20) | Operating mode selector | Ground = Burst Mode; float = FCM; INTVCC = spread spectrum; external clock = sync - single-pin multimode control. |
| TR/SS (21) | Soft-start and tracking control | 1.9µA internal pull-up enables capacitor-programmed slew rate; below 0.97V forces FB tracking - prevents inrush in multi-rail sequencing. |
| GND (22) | Signal ground return | Dedicated GND for feedback and error amplifier reference; tie to main GND plane with short, low-impedance path. |
| PG (23) | Power good open-drain output | Active-high when FB is within ±8% of 0.97V and no faults (thermal, UVLO, EN); pulls low during shutdown or fault - enables system power sequencing. |
| FB (24) | Feedback voltage sense | Regulated to 0.970V ±0.6%; connect resistive divider from VOUT; add 4.7–22pF phase-lead cap from FB to VOUT for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 Architecture | Integrated VIN/BST/INTVCC ceramic capacitors eliminate layout-dependent EMI hotspots and enable CISPR 25 Class 5 compliance without shielding or ferrites. |
| Ultralow Quiescent Current | 2.5µA IQ in Burst Mode at 12VIN→3.3VOUT enables >10-year shelf life in battery-powered telematics and remote sensors. |
| 30ns Minimum On-Time | Enables high-frequency, high-ratio step-down (e.g., 24VIN→1.2VOUT @ 2MHz) without subharmonic oscillation or duty-cycle limitation. |
| Spread Spectrum Modulation | ±22% frequency dithering centered on programmed fSW reduces peak EMI by >10dB, easing EMC certification in crowded RF environments. |
| Forced Continuous Mode | Eliminates discontinuous conduction mode (DCM) artifacts, enabling predictable 200kHz–3MHz operation and fast load-transient recovery (<10µs for 1A step). |
| AEC-Q100 Qualified | Grade 1 qualification (–40°C to +125°C) with full temperature-range characterization ensures reliability in under-hood automotive applications. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
Use Scenario: Powering SoC, DDR memory, and display interface in head-unit with strict CISPR 25 radiated emissions limits. IC Role / Device Role / Timing Role: Primary 5V/6A buck converter with spread spectrum and internal compensation to meet EMI targets without filter redesign. Use Value: Eliminates need for external EMI filters and shielded inductors, reducing BOM cost by $0.42 and saving 120mm² PCB area. | Use Scenario: Generating isolated 3.3V rail for microcontroller and analog front-end in DIN-rail mounted PLC with 24VDC input. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC stage delivering stable 3.3V/6A with <10mVP-P ripple for precision ADC references. Use Value: 95% efficiency at 2MHz enables compact 3.3µH inductor and avoids audible noise from 25kHz–100kHz switching harmonics. |
| ADAS Camera Module Supply | Medical Portable Diagnostic Device |
Use Scenario: Powering image sensor and ISP in rear-view camera exposed to engine bay temperatures up to 125°C. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 buck regulator with 2.5µA Burst Mode IQ to maintain backup power during vehicle sleep mode. Use Value: Enables >15-day battery hold-up time on coin cell while maintaining fast wake-up response via PG signal. | Use Scenario: Battery-powered ultrasound probe requiring ultraquiet 5V rail for sensitive analog receive chain and low standby drain. IC Role / Device Role / Timing Role: Primary 5V/6A converter with Silent Switcher 2 EMI suppression to prevent interference with 2–15MHz echo signals. Use Value: Achieves <10mVP-P output ripple and <−60dBc conducted noise at 5MHz, meeting IEC 60601-1-2 immunity requirements. |
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 |
|---|---|---|---|
| LT8643SEV#TRPBF | External compensation (VC pin), higher sleep IQ (230µA), no CLKOUT pin | Required for current sharing in parallel configurations or ultra-fast transient response with custom loop tuning | Select LT8643SEV#TRPBF when designing for multi-phase operation or demanding load-step performance beyond internal-compensation limits. |
| MPQ4433AGL-AEC1-Z | 40V max input, 6A, 17µA IQ, no spread spectrum, QFN-20 package | Lacks Silent Switcher 2 EMI performance and AEC-Q100 full-grade validation; suitable for non-critical industrial use | Choose MPQ4433AGL-AEC1-Z only for cost-sensitive, non-automotive applications where CISPR 25 compliance is not required. |
Compared with LT8643SEV#TRPBF, the LT8640SEV#TRPBF offers lower quiescent current and integrated compensation for simpler design, while MPQ4433AGL-AEC1-Z trades EMI performance and qualification rigor for lower unit cost in less demanding environments.
Availability
LT8640SEV#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power supplies, and medical portable diagnostics requiring stable component supply, AEC-Q100 qualification, and ultralow EMI compliance.
Supply support for LT8640SEV#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 industrial, automotive, communications, and healthcare markets.
The LT8640S product line delivers high-efficiency, ultralow-EMI synchronous buck regulators for automotive and industrial applications where reliability, small size, and regulatory compliance are critical.
FAQ
What is the maximum input voltage rating for the LT8640SEV#TRPBF?
The LT8640SEV#TRPBF has an absolute maximum input voltage rating of 42V on the VIN, EN/UV, and PG pins. Operation is specified over a 3.4V to 42V input range, making it suitable for 24V and 36V industrial buses and automotive 12V/24V systems with load-dump transients. Exceeding 42V may cause permanent damage.
How does the LT8640SEV#TRPBF achieve ultralow EMI without external filtering?
The LT8640SEV#TRPBF integrates ceramic bypass capacitors for VIN, BST, and INTVCC directly into the LQFN package, minimizing high-di/dt loop areas and eliminating layout-dependent EMI. Combined with Silent Switcher 2's balanced SW node layout and optional spread spectrum modulation, it meets CISPR 25 Class 5 radiated emissions limits without external ferrites or shields.
Can the LT8640SEV#TRPBF operate in forced continuous mode (FCM) and what are its benefits?
Yes, the LT8640SEV#TRPBF enters forced continuous mode (FCM) when the SYNC/MODE pin is left floating. In FCM, the regulator maintains constant switching frequency across all load conditions, enabling predictable EMI behavior, faster load-transient response (<10µs for 1A step), and elimination of low-frequency beat notes common in burst-mode operation.
What is the purpose of the TR/SS pin on the LT8640SEV#TRPBF and how is it used?
TR/SS on the LT8640SEV#TRPBF controls soft-start ramp rate and output voltage tracking. An internal 1.9µA current source charges an external capacitor to set slew rate; pulling TR/SS below 0.97V forces FB to track TR/SS voltage, enabling precise power-rail sequencing in multi-output systems without additional controllers.
Is the LT8640SEV#TRPBF qualified for automotive applications and what grade does it meet?
Yes, the LT8640SEV#TRPBF is AEC-Q100 qualified for automotive applications and meets Grade 1 specifications (–40°C to +125°C operating junction temperature). This qualification covers stress testing, reliability validation, and full temperature-range electrical characterization, making it suitable for engine control, ADAS, and infotainment systems.
LT8640SEV#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-LQFN (4x4)
LT8640SEV#TRPBF FAQ
1.How can I place an order for LT8640SEV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8640SEV#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 LT8640SEV#TRPBF reliable?
The price and inventory of LT8640SEV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8640SEV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8640SEV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8640SEV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8640SEV#TRPBF?
LT8640SEV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8640SEV#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 LT8640SEV#TRPBF?
For technical support, including LT8640SEV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8640SEV#TRPBF requirements.
6.How does Aetrix verify that LT8640SEV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8640SEV#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 LT8640SEV#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8640SEV#TRPBF?
All LT8640SEV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8640SEV#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 LT8640SEV#TRPBF part is unused and in its original packaging.
Return procedure for LT8640SEV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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