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Analog Devices Inc. LT8640SIV-2#PBF
- Part No.:
- LT8640SIV-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
LT8640SIV-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,716
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Product details
Overview
LT8640SIV-2#PBF from Analog Devices is a 42V, 6A synchronous step-down Silent Switcher regulator with internal compensation, 2.5µA quiescent current in Burst Mode, 30ns minimum on-time, and 200kHz–3MHz adjustable switching frequency. It delivers up to 96% efficiency at 1MHz (12VIN→5VOUT) and operates across –40°C to 125°C for automotive and industrial power supplies.
For engineers reviewing the LT8640SIV-2#PBF datasheet, LT8640SIV-2#PBF pinout, LT8640SIV-2#PBF application, or LT8640SIV-2#PBF equivalent, key selection factors include ultralow EMI performance, spread-spectrum modulation capability, forced continuous mode support, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LT8640SIV-2#PBF uses peak current mode control with Silent Switcher architecture to suppress radiated EMI emissions while maintaining high efficiency at 1–3MHz switching frequencies. Its 30ns minimum on-time enables high step-down ratios (e.g., 42VIN→3.3VOUT) without pulse-skipping artifacts.
Burst Mode operation reduces input quiescent current to 2.5µA when regulating 12VIN to 3.3VOUT, while forced continuous mode (FCM) ensures consistent switching frequency across load range for predictable EMI filtering and transient response. Internal compensation eliminates external loop components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients and industrial 24/36V rails. |
| Output Current | 6A continuous, 7A peak - sustains full load under thermal derating with proper PCB layout. |
| Quiescent Current | 2.5µA in Burst Mode (12VIN→3.3VOUT) - enables always-on systems with multi-year battery life. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows optimization of size vs. efficiency vs. EMI. |
| Min On-Time | 30ns - enables high VIN/VOUT ratios (e.g., 42V→3.3V) at 2MHz without duty-cycle limitation. |
| Feedback Reference | 0.970V ±0.006V - tight tolerance enables accurate output regulation with minimal resistor drift error. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum - meets automotive EMC requirements without added shielding. |
Pinout & Package
LT8640SIV-2#PBF is housed in a thermally enhanced 24-lead LQFN package (4mm × 4mm × 0.94mm) with exposed GND pads (Pins 25–28) requiring soldering to PCB for optimal thermal performance (θJC = 7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator supply | Accepts VOUT (≥3.3V) to reduce VIN current draw and improve light-load efficiency. |
| INTVCC (2) | Internal 3.4V rail bypass | Requires ≥1µF low-ESR ceramic capacitor; powers gate drivers and control logic. |
| GND (3,16,25–28) | Power and signal ground | Multiple GND pins and exposed pad minimize impedance and thermal resistance. |
| VIN (5,6,13,14) | Main input power | Four dedicated pins reduce trace inductance; require local 1µF + 2.2µF bypass capacitors. |
| BST (7) | Bootstrap supply | Drives high-side NMOS gate; requires 0.1µF ceramic capacitor between BST and SW. |
| SW (8–12) | Power switch node | Five paralleled pins reduce conduction loss and EMI radiation; connect directly to inductor. |
| EN/UV (17) | Enable / undervoltage lockout | 1.00V rising threshold with 40mV hysteresis; supports programmable VIN UVLO via resistor divider. |
| RT (18) | Frequency programming | Resistor to GND sets fSW (e.g., 60.4kΩ = ~2MHz); enables precise EMI frequency placement. |
| CLKOUT (19) | Switching clock monitor | Outputs ~200ns pulses at fSW in FCM/spread-spectrum/sync modes; low in Burst Mode. |
| SYNC/MODE (20) | Operating mode select | GND = Burst Mode; float = FCM; INTVCC = spread spectrum; external clock = sync mode. |
| TR/SS (21) | Soft-start / tracking | 1.9µA pull-up enables RC-programmed ramp rate; supports output voltage sequencing. |
| GND (22) | Signal ground | Dedicated ground return for feedback and soft-start circuitry; improves noise immunity. |
| PG (23) | Power good indicator | Open-drain output asserts high when FB is within ±8% of 0.97V and no faults exist. |
| FB (24) | Feedback input | Regulates to 0.970V reference; connects to resistor divider tap and phase-lead capacitor (4.7–22pF). |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher architecture | Integrated dual-loop layout minimizes magnetic field coupling, enabling CISPR 25 Class 5 compliance without shielding. |
| Ultralow IQ Burst Mode | 2.5µA input current at no load (12VIN→3.3VOUT) extends battery runtime in always-on automotive modules. |
| Spread spectrum modulation | 22% frequency dithering reduces peak EMI by >10dB, easing filter design and board-level EMC certification. |
| Forced continuous mode | Eliminates variable-frequency artifacts during transients, ensuring predictable loop stability and EMI filter behavior. |
| AEC-Q100 Grade I | Qualified for –40°C to +125°C junction temperature; supports under-hood automotive applications per ISO 16750. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 5V/3.3V rails for display controllers, audio codecs, and CAN transceivers in head units. IC Role / Device Role / Timing Role: Primary 42V-input buck converter delivering regulated 5V/6A and 3.3V/3A outputs. Use Value: 2.5µA quiescent current prevents battery drain during vehicle sleep mode; spread spectrum meets OEM EMC limits. | Use Scenario: Generating isolated 5V logic supply from 24V DC field bus in modular I/O terminals. IC Role / Device Role / Timing Role: High-efficiency, wide-input buck regulator powering FPGA, ADC, and digital isolators. Use Value: 30ns min on-time supports 24V→3.3V conversion at 2MHz, reducing inductor size by 40% vs. legacy solutions. |
| Medical Portable Monitor | Telecom Remote Radio Unit |
Use Scenario: Battery-powered patient monitor requiring long runtime and low EMI near sensitive analog front-ends. IC Role / Device Role / Timing Role: Main system power supply converting Li-ion (3.0–4.2V) or 12V adapter to 3.3V/5V rails. Use Value: Silent Switcher architecture avoids interference with ECG/SpO₂ signal chains; <10mVP-P ripple ensures clean analog references. | Use Scenario: Powering RF amplifiers and data converters in outdoor 4G/5G small cells powered from 48V PoE or solar. IC Role / Device Role / Timing Role: Intermediate 48V→12V/6A stage feeding downstream point-of-load regulators. Use Value: 42V max input withstands 48V telecom surges; 95% efficiency at 2MHz reduces heatsink requirements in sealed enclosures. |
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 |
|---|---|---|---|
| LT8643SIV-2#PBF | External compensation (VC pin), higher sleep IQ (230µA), no CLKOUT pin | Required for current sharing or ultra-fast transient response in multi-phase designs | Select when loop tuning or parallel operation is needed; not drop-in compatible due to VC/CLKOUT pin differences |
| MPQ4433AGL-AEC1-P | 3.8V–60V input, 3.5A output, 17µA IQ, no spread spectrum, QFN-16 | Limited current and EMI performance; suitable for cost-sensitive non-automotive applications | Choose for lower-cost, lower-current designs where AEC-Q100 and ultralow EMI are not required |
Compared with LT8643SIV-2#PBF, the LT8640SIV-2#PBF offers simpler layout (no compensation network) and lower standby power, while MPQ4433AGL-AEC1-P trades EMI performance and current capability for footprint and cost reduction.
Availability
LT8640SIV-2#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power supplies, medical portable monitors, and telecom remote radio units requiring stable component supply and AEC-Q100 compliance.
Supply support for LT8640SIV-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, communications, and automotive markets.
The LT8640S-2 product line delivers high-efficiency, low-EMI power conversion for demanding automotive and industrial applications where reliability, compact size, and regulatory compliance are critical.
FAQ
What is the maximum input voltage rating for the LT8640SIV-2#PBF?
The LT8640SIV-2#PBF has an absolute maximum input voltage rating of 42V on all VIN pins (Pins 5, 6, 13, 14). Operation above this voltage risks permanent damage. The device is designed for automotive battery systems (including cold-crank and load-dump transients) and industrial 24/36V rails, with guaranteed operation from 3.4V to 42V.
Does the LT8640SIV-2#PBF support spread spectrum modulation, and how is it enabled?
Yes, the LT8640SIV-2#PBF supports spread spectrum modulation to reduce peak EMI emissions. It is enabled by connecting the SYNC/MODE pin (Pin 20) to INTVCC (~3.4V) or an external 3V–4V supply. This activates forced continuous mode with 22% frequency dithering centered on the RT-set frequency, improving CISPR 25 compliance without hardware changes.
What is the quiescent current of the LT8640SIV-2#PBF in Burst Mode operation?
The LT8640SIV-2#PBF draws 2.5µA from VIN when regulating 12VIN to 3.3VOUT in Burst Mode operation (SYNC/MODE = GND). This value is measured across the full –40°C to 125°C temperature range and enables multi-year battery life in always-on automotive modules such as telematics control units.
Can the LT8640SIV-2#PBF be synchronized to an external clock source?
Yes, the LT8640SIV-2#PBF can be synchronized to an external clock source via the SYNC/MODE pin (Pin 20). Applying a clean CMOS/TTL clock signal to this pin forces the device into forced continuous mode and aligns its switching edges to the external frequency, enabling deterministic EMI placement and multi-regulator phase control in complex power systems.
Is the LT8640SIV-2#PBF qualified for automotive applications?
Yes, the LT8640SIV-2#PBF is AEC-Q100 Grade I qualified (–40°C to +125°C operating junction temperature) and manufactured under controlled automotive processes. It is designated for use in automotive applications including infotainment, ADAS domain controllers, and body electronics where reliability, thermal robustness, and EMC compliance are mandatory.
LT8640SIV-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:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-LQFN (4x4)
LT8640SIV-2#PBF FAQ
1.How can I place an order for LT8640SIV-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8640SIV-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 LT8640SIV-2#PBF reliable?
The price and inventory of LT8640SIV-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 LT8640SIV-2#PBF is usually 5 days.
3.What payment methods are accepted for LT8640SIV-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8640SIV-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8640SIV-2#PBF?
LT8640SIV-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8640SIV-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 LT8640SIV-2#PBF?
For technical support, including LT8640SIV-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8640SIV-2#PBF requirements.
6.How does Aetrix verify that LT8640SIV-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT8640SIV-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 LT8640SIV-2#PBF meets industry standards.
7.What is the process for return or replacement of LT8640SIV-2#PBF?
All LT8640SIV-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8640SIV-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 LT8640SIV-2#PBF part is unused and in its original packaging.
Return procedure for LT8640SIV-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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