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Analog Devices Inc. LT8640SIV#TRPBF
- Part No.:
- LT8640SIV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
LT8640SIV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,637
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Product details
Overview
LT8640SIV#TRPBF from Analog Devices is a 42V, 6A synchronous step-down DC/DC regulator featuring Silent Switcher 2 architecture, 2.5µA quiescent current in Burst Mode, 30ns minimum on-time, and integrated bypass capacitors for ultralow EMI. It operates from 3.4V to 42V input, delivers 0.97V–10V output, and targets noise-sensitive automotive and industrial power rails.
For engineers reviewing the LT8640SIV#TRPBF datasheet, LT8640SIV#TRPBF pinout, LT8640SIV#TRPBF application, or LT8640SIV#TRPBF equivalent, this page provides verified technical context, package mapping, real-world application cards, and validated alternative parts for low-EMI, high-efficiency 6A buck conversion in constrained layouts.
Technical Context
The LT8640SIV#TRPBF uses peak current mode control with internal compensation and integrates ceramic bypass capacitors on-die for VIN, BST, and INTVCC-minimizing fast-current loop area to suppress radiated EMI without external layout tuning. Its 30ns minimum on-time enables 12VIN-to-3.3VOUT conversion at 2MHz switching frequency.
Burst Mode operation achieves 2.5µA IQ regulating 12VIN to 3.3VOUT, while forced continuous mode (FCM) and spread-spectrum modulation provide harmonic control and further EMI reduction. The device supports synchronization from 200kHz to 3MHz via RT resistor or external clock on SYNC/MODE pin.
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 - sustains full-load operation under thermal limits on standard 4-layer PCB with exposed pad soldered. |
| Quiescent Current | 2.5µA in Burst Mode - enables >1-year battery life in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows optimization of size (high-freq) vs. efficiency (low-freq) without changing inductor value. |
| Feedback Reference | 0.970V ±6mV over –40°C to 125°C - ensures tight output regulation across temperature for precision analog supplies. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum - eliminates need for external EMI filters in automotive infotainment and ADAS ECUs. |
| Minimum On-Time | 30ns - enables high step-down ratios (e.g., 36VIN→3.3VOUT) at 2MHz, reducing solution size vs. multi-stage converters. |
Pinout & Package
LT8640SIV#TRPBF is housed in a thermally enhanced 24-lead LQFN package (4mm × 4mm × 0.94mm) with exposed GND pads (pins 25–28) requiring PCB soldering for optimal thermal performance (θJC = 7°C/W). Pin count and footprint match standard QFN-24 but integrate internal bypass caps for reduced layout sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator supply | Accepts VOUT (≥3.3V) to reduce VIN current draw and improve efficiency; must be bypassed with 1µF if externally supplied. |
| INTVCC (2) | Internal 3.4V rail bypass | Must be left floating; powers gate drivers and control logic; sourced from BIAS if >3.1V, else from VIN. |
| GND (3, 16, 25–28) | Power and signal ground | Multiple GND pins and exposed pad minimize impedance; negative input capacitor terminal must connect directly to these pins. |
| VIN (5, 6, 13, 14) | Main input power | Four parallel pins reduce resistance and inductance; require ≥2.2µF local ceramic bypass per group. |
| BST (7) | Bootstrap supply | Floats; connects to SW node via 0.1µF ceramic cap to drive high-side MOSFET gate above VIN. |
| SW (8–12) | Power switch output | Five paralleled SW pins reduce conduction loss and EMI; must connect directly to inductor with minimal trace area. |
| EN/UV (17) | Enable / undervoltage lockout | Hysteretic threshold (1.00V rise / 0.96V fall); resistor divider from VIN sets custom UVLO point (e.g., 6V cutoff). |
| RT (18) | Frequency programming | Resistor to GND sets fSW: 221kΩ = 210kHz, 60.4kΩ = 700kHz, 18.2kΩ = 1.95MHz - enables precise EMI band avoidance. |
| CLKOUT (19) | Switching clock monitor | Outputs ~200ns pulses at fSW in FCM/spread-spectrum/sync modes; low in Burst Mode - useful for system timing sync. |
| SYNC/MODE (20) | Operating mode select | Ground = Burst Mode; float = FCM; 3–4V = spread spectrum; external clock = sync - single-pin multimode control. |
| TR/SS (21) | Soft-start / tracking | 1.9µA internal pull-up charges external cap for controlled VOUT ramp; also enables output voltage tracking in multi-rail systems. |
| GND (22) | Signal ground | Dedicated GND for feedback and error amplifier reference; must tie to main GND plane near FB pin. |
| PG (23) | Power good indicator | Open-drain output asserts high when VOUT is within ±8% of target and no faults (thermal, UVLO, EN low) are present. |
| FB (24) | Feedback input | Regulated to 0.970V; connects to resistor divider tap; requires 4.7–22pF phase-lead cap to VOUT for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 architecture | On-die VIN/BST/INTVCC ceramic capacitors eliminate layout-dependent EMI spikes - meets CISPR 25 Class 5 without ferrite beads or shields. |
| Ultralow 2.5µA quiescent current | Enables >10-year shelf life in battery-backed systems and satisfies ISO 16750-2 quiescent current requirements for automotive modules. |
| 30ns minimum on-time | Supports direct 36VIN-to-3.3VOUT conversion at 2MHz, eliminating need for pre-regulator stages in high-input systems. |
| Spread-spectrum modulation | Reduces peak EMI by >10dB across 22% frequency dither range - critical for passing narrowband EMI tests in infotainment head units. |
| AEC-Q100 Grade I qualified | Rated for –40°C to +125°C junction temperature with production-tested reliability - suitable for engine bay and ADAS camera modules. |
| Forced Continuous Mode (FCM) | Eliminates switching frequency variation under light load - prevents audible noise in audio subsystems and simplifies EMI filtering. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering 5V/3.3V rails for SoC, display controller, and USB PHY in head unit with strict CISPR 25 Class 5 EMI limits. IC Role / Device Role / Timing Role: Primary 42V-input synchronous buck converter delivering regulated 5V @ 6A with ultralow EMI and 2.5µA sleep current. Use Value: Eliminates external EMI filter components and reduces board area by 35% vs. legacy buck solutions while meeting automotive EMC certification. |
Use Scenario: Generating isolated 5V/3.3V supplies for digital I/O, ADC, and communication interfaces in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: High-reliability 6A buck regulator operating from 24VDC industrial bus with robust reverse-current protection and 150°C thermal shutdown. Use Value: Sustains full load at 70°C ambient without derating and tolerates 42V transients per IEC 61000-4-5, reducing need for upstream TVS. |
| ADAS Camera Module | Medical Portable Monitor |
|
Use Scenario: Powering image sensor, ISP, and MIPI interface in compact rear-view camera with stringent thermal and EMI constraints. IC Role / Device Role / Timing Role: Compact 4mm×4mm buck converter delivering 3.3V @ 2A with 30ns min-on-time for 12VIN-to-3.3VOUT at 2MHz. Use Value: Enables 2MHz operation with 1µH inductor, cutting solution size by 50% vs. 500kHz designs while maintaining <10mVP-P ripple. |
Use Scenario: Battery-powered patient monitor requiring long runtime, low-noise analog supplies, and zero audible switching noise. IC Role / Device Role / Timing Role: Low-IQ buck regulator supplying 3.3V/5V rails with Burst Mode (2.5µA IQ) and Forced Continuous Mode for noise-sensitive ADC references. Use Value: Extends battery life to 12+ hours on 2000mAh Li-ion while eliminating coil whine during ECG waveform acquisition. |
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#TRPBF | External compensation (VC pin), higher 230µA sleep IQ, same 6A/42V specs | Required for current sharing or ultrafast transient response in multi-phase or high-dV/dt loads | Select when design needs adjustable loop bandwidth or paralleling multiple regulators for >6A output. |
| MPQ4433AGL-AEC1-Z | 3.8V–60V input, 3.5A output, 17µA IQ, no spread spectrum, AEC-Q100 Grade 1 | Lacks Silent Switcher 2 EMI suppression and 30ns min-on-time - requires larger inductor for same input/output ratio | Choose for cost-sensitive automotive applications where EMI is managed externally and 3.5A output suffices. |
Compared with LT8640SIV#TRPBF, LT8643SIV#TRPBF offers design flexibility for dynamic load regulation at the cost of higher sleep current, while MPQ4433AGL-AEC1-Z provides broader input range and lower cost but sacrifices EMI performance and minimum on-time capability.
Availability
LT8640SIV#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, ADAS camera modules, and portable medical devices requiring stable component supply, AEC-Q100 qualification, and ultralow EMI compliance.
Supply support for LT8640SIV#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 with precision power and signal chain solutions.
The LT8640S/LT8643S family was engineered specifically for noise-sensitive automotive and industrial applications demanding high efficiency, ultralow EMI, and robust operation across wide input ranges and extreme temperatures.
FAQ
What is the maximum output current rating of the LT8640SIV#TRPBF?
The LT8640SIV#TRPBF delivers 6A continuous output current and supports up to 7A peak current under short-duration pulsed loads. This rating assumes proper PCB thermal design with the exposed GND pad fully soldered to a thermal plane and operation within the –40°C to 125°C junction temperature range specified for the LT8640SIV#TRPBF.
Does the LT8640SIV#TRPBF require external compensation components?
No, the LT8640SIV#TRPBF uses internal compensation and does not require external RC networks on the VC pin. Unlike the LT8643SIV#TRPBF variant, the LT8640SIV#TRPBF integrates all compensation circuitry, simplifying layout and reducing bill-of-materials count for standard single-rail applications.
How does the LT8640SIV#TRPBF achieve ultralow EMI performance?
The LT8640SIV#TRPBF achieves ultralow EMI through Silent Switcher 2 architecture, which integrates ceramic bypass capacitors for VIN, BST, and INTVCC directly into the package. This minimizes high-di/dt loop area, suppresses common-mode EMI, and enables consistent CISPR 25 Class 5 compliance without external filters or shielding - a key feature of the LT8640SIV#TRPBF.
Can the LT8640SIV#TRPBF operate from a 3.4V input supply?
Yes, the LT8640SIV#TRPBF has a minimum input voltage of 3.4V and functions reliably down to this level while maintaining regulation. At 3.4V input, it can deliver its full 6A output only if the output voltage is set low enough (e.g., 3.3V) to maintain sufficient headroom for the 100mV dropout at 1A - a confirmed specification for the LT8640SIV#TRPBF.
Is the LT8640SIV#TRPBF qualified for automotive applications?
Yes, the LT8640SIV#TRPBF is AEC-Q100 Grade I qualified for operation from –40°C to +125°C junction temperature and designed to meet automotive reliability and stress test requirements. It is explicitly listed in Analog Devices' automotive product portfolio and supports use in infotainment, body electronics, and ADAS systems.
LT8640SIV#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-LQFN (4x4)
LT8640SIV#TRPBF FAQ
1.How can I place an order for LT8640SIV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8640SIV#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 LT8640SIV#TRPBF reliable?
The price and inventory of LT8640SIV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8640SIV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8640SIV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8640SIV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8640SIV#TRPBF?
LT8640SIV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8640SIV#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 LT8640SIV#TRPBF?
For technical support, including LT8640SIV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8640SIV#TRPBF requirements.
6.How does Aetrix verify that LT8640SIV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8640SIV#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 LT8640SIV#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8640SIV#TRPBF?
All LT8640SIV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8640SIV#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 LT8640SIV#TRPBF part is unused and in its original packaging.
Return procedure for LT8640SIV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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