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Analog Devices Inc. LT8640SHV-2#PBF
- Part No.:
- LT8640SHV-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
LT8640SHV-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,134
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Product details
Overview
LT8640SHV-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 AEC-Q100 H-grade (–40°C to 150°C) qualification for automotive power systems. It delivers up to 96% efficiency at 1MHz (12VIN→5VOUT) and supports spread-spectrum EMI reduction.
For engineers reviewing the LT8640SHV-2#PBF datasheet, LT8640SHV-2#PBF pinout, LT8640SHV-2#PBF application, or LT8640SHV-2#PBF equivalent, key selection criteria include ultralow IQ regulation, 42V input tolerance, thermal grade H operation, Silent Switcher EMI performance, and LQFN-24 package compatibility with automotive PCB layouts.
Technical Context
The LT8640SHV-2#PBF uses peak current mode control with a 30ns minimum on-time to support high step-down ratios at switching frequencies from 200kHz to 3MHz. Its Silent Switcher architecture integrates dual independent input paths and symmetrical layout to minimize magnetic field emissions.
Burst Mode operation enables 2.5µA IQ regulating 12VIN to 3.3VOUT, while forced continuous mode (FCM) and spread-spectrum modulation are selectable via the SYNC/MODE pin. Internal compensation eliminates external loop components, simplifying design for space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients including cold-crank and load-dump conditions. |
| Output Current | 6A continuous, 7A peak - sustains full-rated output under sustained thermal loads in H-grade operation. |
| Quiescent Current | 2.5µA in Burst Mode (12VIN→3.3VOUT) - enables always-on subsystems with multi-year battery life. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows optimization of size vs. efficiency across 12V/24V/48V architectures. |
| Min On-Time | 30ns - enables direct 42V-to-3.3V conversion at 2MHz without intermediate stages. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum - meets stringent automotive radiated emission requirements without shielding. |
| Junction Temp Range | –40°C to 150°C (H-grade) - qualified for under-hood engine control and ADAS power rails. |
Pinout & Package
LT8640SHV-2#PBF is housed in a thermally enhanced 24-lead 4mm × 4mm × 0.94mm LQFN package with exposed GND pads (pins 25–28) requiring soldering to PCB for optimal thermal resistance (θJC(PAD) = 7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Accepts VOUT (≥3.3V) to reduce VIN current draw; critical for high-efficiency light-load operation. |
| INTVCC (2) | Internal 3.4V regulator bypass | Requires ≥1µF low-ESR ceramic capacitor to ground; powers control circuitry and gate drivers. |
| GND (3, 16, 25–28) | Power and signal reference | Multiple GND pins and exposed pad must be connected to solid ground plane for EMI and thermal integrity. |
| VIN (5, 6, 13, 14) | Main input power supply | Four dedicated VIN pins enable low-inductance routing of high di/dt input currents. |
| BST (7) | Bootstrap supply for top FET gate | Requires 0.1µF ceramic capacitor between BST and SW to sustain high-side switch drive. |
| SW (8–12) | Power switch node | Five paralleled SW pins reduce conduction loss and EMI; connect directly to inductor with minimal trace area. |
| EN/UV (17) | Enable and undervoltage lockout | Hysteretic threshold (0.96V/1.00V) enables programmable input UVLO using resistor divider from VIN. |
| RT (18) | Frequency programming | Resistor to GND sets oscillator frequency; 221k → 210kHz, 60.4k → 700kHz, 18.2k → 1.95MHz. |
| 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 selector | GND = Burst Mode; float = FCM; INTVCC = spread spectrum; external clock = sync - no external components needed. |
| TR/SS (21) | Soft-start and tracking | 1.9µA internal pull-up enables capacitor-programmed slew rate; supports output voltage sequencing. |
| GND (22) | Signal ground | Dedicated GND return for feedback and control signals; improves noise immunity of FB and PG. |
| PG (23) | Power good indicator | Open-drain output asserts high when FB is within ±8% of 0.97V and no faults (thermal, UVLO, EN). |
| FB (24) | Feedback reference input | Regulates to precise 0.970V reference; connects to resistor divider tap; requires 4.7–22pF phase-lead capacitor to VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Dual-input, symmetric layout minimizes magnetic field emissions - achieves CISPR 25 Class 5 without metal shielding or ferrites. |
| Ultralow Quiescent Current | 2.5µA IQ in Burst Mode enables >10-year battery life in always-on automotive modules (e.g., telematics, body controllers). |
| 30ns Minimum On-Time | Enables single-stage 42V-to-3.3V/5V conversion at 2MHz, eliminating cascaded regulators and reducing BOM count. |
| AEC-Q100 Grade H | Qualified for –40°C to 150°C junction operation - suitable for engine bay, transmission, and radar power supplies. |
| Spread Spectrum Modulation | Reduces peak EMI by >10dB across 22% frequency deviation - simplifies EMC compliance testing and board-level filtering. |
| Internal Compensation | Eliminates external RC network on VC pin - reduces component count and layout sensitivity for robust production designs. |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Radar Power Supply |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensors in under-hood ECUs subject to 45V load-dump transients and 150°C ambient. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator delivering 6A with ultralow IQ and thermal resilience. Use Value: Eliminates need for external TVS and heatsinking while meeting ISO 7637-2 pulse 5a/b immunity and AEC-Q100 H-grade reliability. | Use Scenario: Generating clean, low-noise 5V supply for 77GHz radar MMICs and DSPs in front-bumper modules. IC Role / Device Role / Timing Role: Low-EMI, high-efficiency buck converter operating at 2MHz to avoid radar band interference. Use Value: Spread-spectrum mode suppresses narrowband EMI peaks that could desensitize radar receivers during FCC/ETSI certification. |
| Industrial IoT Gateway | Commercial Vehicle Telematics |
Use Scenario: Powering ARM-based gateways with cellular/Wi-Fi/BLE radios in harsh environments (–40°C to 85°C ambient). IC Role / Device Role / Timing Role: Single-chip 42V-input regulator supporting wide input range and low standby consumption. Use Value: 2.5µA IQ extends backup battery runtime during grid outages; 42V rating covers 36V truck battery fluctuations. | Use Scenario: Supplying GPS, GNSS, and LTE modems in fleet management units mounted near diesel engines. IC Role / Device Role / Timing Role: High-reliability DC/DC with AEC-Q100 qualification and robust EMI suppression for noisy vehicle electrical systems. Use Value: Silent Switcher architecture prevents conducted/radiated noise from disrupting GNSS signal acquisition and LTE data throughput. |
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 |
|---|---|---|---|
| LT8640SEV-2#PBF | Same silicon, E-grade (–40°C to 125°C), lower max junction temperature and derated thermal performance. | Suitable for cabin electronics or non-under-hood applications where 150°C operation is not required. | Select LT8640SHV-2#PBF when ambient exceeds 125°C or long-term reliability at high junction temp is critical. |
| LT8643SHV-2#PBF | External compensation, VC pin exposed, higher sleep IQ (230µA with BIAS=0V), supports current sharing and faster transient response. | Preferred for multiphase designs, high-dynamic-load ADAS processors, or when loop tuning is required. | Choose LT8640SHV-2#PBF for simplified single-phase designs where internal compensation suffices and lowest IQ is mandatory. |
Compared with LT8640SEV-2#PBF, the LT8640SHV-2#PBF provides guaranteed 150°C operation and superior thermal margin for under-hood deployment; versus LT8643SHV-2#PBF, it trades external loop control for lower quiescent current and reduced component count in fixed-output applications.
Availability
LT8640SHV-2#PBF is available at Aetrix Electronics and suitable for automotive engine control, ADAS radar power supplies, and industrial IoT gateways requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT8640SHV-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, industrial automation, and automotive markets.
The LT8640S-2 family delivers high-efficiency, low-EMI power conversion for automotive and industrial applications where reliability under extreme voltage and temperature stress is non-negotiable.
FAQ
What is the maximum junction temperature specification for LT8640SHV-2#PBF?
The LT8640SHV-2#PBF is AEC-Q100 qualified for H-grade operation with a guaranteed maximum junction temperature of 150°C. This rating is validated across the full –40°C to 150°C operating junction temperature range, enabling use in under-hood automotive locations where ambient temperatures exceed 125°C. Thermal derating applies above 125°C per the datasheet's lifetime model.
Does LT8640SHV-2#PBF support spread-spectrum EMI reduction?
Yes, the LT8640SHV-2#PBF supports spread-spectrum modulation when the SYNC/MODE pin is tied to INTVCC (~3.4V). In this mode, the switching frequency dithers over a ±11% range (22% total deviation) at 3kHz, reducing peak radiated emissions by >10dB and easing CISPR 25 Class 5 compliance without additional filtering components.
What is the quiescent current of LT8640SHV-2#PBF in Burst Mode operation?
The LT8640SHV-2#PBF draws 2.5µA quiescent current from VIN when regulating 12VIN to 3.3VOUT in Burst Mode operation. This value is measured across the full operating temperature range and enables multi-year battery life in always-on automotive subsystems such as telematics control units and smart sensors.
How is the switching frequency programmed on LT8640SHV-2#PBF?
The switching frequency of LT8640SHV-2#PBF is set using an external resistor connected between the RT pin and GND. Typical values include 221kΩ for ~210kHz, 60.4kΩ for ~700kHz, and 18.2kΩ for ~1.95MHz. The relationship is linear and specified over temperature; no calibration is required.
Is LT8640SHV-2#PBF pin-compatible with other members of the LT8640S-2/LT8643S-2 family?
Yes, the LT8640SHV-2#PBF shares identical pinout, package dimensions, and footprint with all LQFN-24 variants in the LT8640S-2/LT8643S-2 family, including LT8640SEV-2#PBF and LT8643SHV-2#PBF. This enables drop-in replacement across grades and compensation types without PCB redesign.
LT8640SHV-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-LQFN (4x4)
LT8640SHV-2#PBF FAQ
1.How can I place an order for LT8640SHV-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8640SHV-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 LT8640SHV-2#PBF reliable?
The price and inventory of LT8640SHV-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 LT8640SHV-2#PBF is usually 5 days.
3.What payment methods are accepted for LT8640SHV-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8640SHV-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8640SHV-2#PBF?
LT8640SHV-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8640SHV-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 LT8640SHV-2#PBF?
For technical support, including LT8640SHV-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8640SHV-2#PBF requirements.
6.How does Aetrix verify that LT8640SHV-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT8640SHV-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 LT8640SHV-2#PBF meets industry standards.
7.What is the process for return or replacement of LT8640SHV-2#PBF?
All LT8640SHV-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8640SHV-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 LT8640SHV-2#PBF part is unused and in its original packaging.
Return procedure for LT8640SHV-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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