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Analog Devices Inc. LT8640HUDC#TRPBF
- Part No.:
- LT8640HUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN, 18 Leads, Exposed Pad
- Datasheet:
-
LT8640HUDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,752
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Product details
Overview
LT8640HUDC#TRPBF from Analog Devices is a 42V, 5A synchronous step-down Silent Switcher regulator with 2.5µA quiescent current in regulation, 30ns minimum on-time, and AEC-Q100-qualified 150°C junction temperature rating. It delivers up to 96% efficiency at 1MHz (12VIN→5VOUT) and supports pulse-skipping mode for ultralow EMI in automotive infotainment power supplies.
For engineers reviewing the LT8640HUDC#TRPBF datasheet, LT8640HUDC#TRPBF pinout, LT8640HUDC#TRPBF application, or LT8640HUDC#TRPBF equivalent, key selection criteria include input voltage range (3.4V–42V), forced continuous mode availability (LT8640-1 variant only), thermal grade (H-grade, –40°C to 150°C), and Silent Switcher architecture for CISPR 25 Class 5 radiated EMI compliance.
Technical Context
The LT8640HUDC#TRPBF implements peak current mode control with an internal 0.970V reference and programmable switching frequency (200kHz–3MHz via RT resistor). Its Silent Switcher architecture uses dual, matched input paths and integrated bypass capacitors to suppress common-mode EMI without external filters.
It features Burst Mode® operation (2.5µA IQ at full regulation), selectable operating modes via SYNC/MODE pin (Burst, pulse-skipping, spread spectrum, or external sync), and robust protection including thermal shutdown, VIN UVLO, and overcurrent limiting with 7.5A–12.5A typical current limit depending on duty cycle and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients (cold crank, load dump) without external pre-regulation |
| Output Current | 5A continuous, 7A peak - sustains transient loads in ADAS camera modules and radar subsystems |
| Quiescent Current | 2.5µA in regulation - enables >10-year battery life in always-on vehicle telematics and remote keyless entry receivers |
| Min. On-Time | 30ns - enables high-frequency, high-step-down conversion (e.g., 42VIN → 3.3VOUT at 2MHz) |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows optimization of size (high fSW) vs. efficiency (low fSW) per application |
| EMI Performance | CISPR 25 Class 5 compliant (with filter) - meets stringent automotive radiated emission limits without ferrite beads or shielding cans |
| Junction Temp Range | –40°C to 150°C (H-grade) - qualified for under-hood and transmission-control module environments |
Pinout & Package
LT8640HUDC#TRPBF is housed in an 18-lead 3mm × 4mm plastic QFN package with exposed SW pads (pins 21, 22) for thermal conduction. The package is RoHS-compliant, lead-free, and features side-wettable terminations for automated optical inspection (AOI).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Reduces input supply current when tied to VOUT ≥3.3V; enables higher efficiency across full load range |
| INTVCC (2) | Internal 3.4V LDO output | Bypassed with ≥1µF ceramic capacitor; powers gate drivers and control logic; not for external loading |
| BST (3) | Bootstrap capacitor connection | Requires 0.1µF ceramic cap close to IC; enables high-side NMOS drive above VIN |
| VIN1/VIN2 (4,13) | Dual input power inputs | Each requires dedicated 1µF local ceramic bypass; reduces high-frequency input ripple and EMI loop area |
| GND1/GND2 (6,7,10,11) | Power switch return paths | Must be tied together and connected to low-impedance ground plane; minimizes switching noise coupling |
| SW (8,9,21,22) | Power switch node | Exposed pads (21,22) must be soldered to SW trace for thermal performance; critical for EMI reduction |
| EN/UV (14) | Enable and input undervoltage lockout | Hysteretic threshold (0.96V/1.00V); supports programmable VIN cutoff using external resistor divider |
| RT (15) | Frequency programming | Resistor to GND sets fSW (e.g., 60.4kΩ = ~2MHz); enables precise EMI frequency placement |
| TR/SS (16) | Soft-start and tracking | 1.9µA internal pull-up enables capacitor-based slew rate control; supports power sequencing with other rails |
| SYNC/MODE (17) | Operating mode selection | Ground = Burst Mode; float = pulse-skipping; INTVCC = spread spectrum; external clock = sync - no FCM on LT8640 variant |
| GND (18) | System ground reference | Connects to system ground plane; completes feedback and PG signal return path |
| PG (19) | Power good open-drain output | Asserts high when FB is within ±8% of 0.970V and no fault; drives µC reset or enable signals |
| FB (20) | Feedback voltage sense | Regulated to 0.970V; requires 4.7pF–22pF phase-lead capacitor between FB and VOUT for stability |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Dual-input, symmetric layout with integrated bypass caps reduces radiated EMI by >30dB vs. conventional buck regulators |
| Ultralow 2.5µA quiescent current | Enables >10-year shelf life in battery-backed automotive modules without compromising startup time or regulation accuracy |
| 30ns minimum on-time | Supports direct 42VIN-to-3.3VOUT conversion at 2MHz, eliminating intermediate stages and reducing BOM count |
| AEC-Q100 Grade H qualification | Validated for operation up to 150°C junction temperature - suitable for engine control units and transmission ECUs |
| Spread spectrum modulation | +22% frequency dithering reduces peak EMI amplitude by spreading energy across 3kHz bandwidth, easing filter design |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powering SoC, DDR memory, and display interface in head-unit systems with strict CISPR 25 Class 5 radiated EMI limits. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck converter delivering regulated rail with <10mVP-P ripple and fast load transient response. Use Value: Silent Switcher architecture eliminates need for external EMI filters, reducing PCB area by 25% and bill-of-materials cost by $0.35 per unit. | Use Scenario: Supplying image sensor and ISP in rear-view and surround-view cameras mounted near engine compartments. IC Role / Device Role / Timing Role: High-reliability 3.3V/1.8V step-down regulator operating continuously at 125°C ambient with 5A peak pulsed load capability. Use Value: H-grade 150°C junction rating ensures 15+ year field life under thermal cycling; 30ns min on-time enables single-stage 12VIN→1.8VOUT conversion. |
| Radar Transceiver Bias Supply | Telematics Control Unit (TCU) Core Rail |
Use Scenario: Generating clean, low-noise 5V bias for RF front-end and ADC in 77GHz automotive radar modules. IC Role / Device Role / Timing Role: Low-EMI, high-efficiency buck converter synchronized to system clock to avoid beat frequencies in sensitive RF bands. Use Value: Spread spectrum + external sync capability suppresses narrowband EMI peaks at harmonics of 77GHz carrier, improving radar SNR by 4dB. | Use Scenario: Providing always-on 3.3V core rail for cellular modem, GNSS receiver, and CAN controller in vehicle telematics gateways. IC Role / Device Role / Timing Role: Ultralow-IQ buck regulator maintaining regulation during sleep mode with <2.5µA input current and fast wake-up (<10µs). Use Value: 2.5µA quiescent current extends 12V battery standby life beyond 10 years - meeting OEM requirements for zero-maintenance TCU deployments. |
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 |
|---|---|---|---|
| LT8640-1HUDC#TRPBF | Forced Continuous Mode (FCM) enabled; no pulse-skipping; higher light-load IQ (~600µA) | Required for fast transient response in CPU/GPU power rails where output voltage droop must be <1% | Select LT8640-1HUDC#TRPBF when load steps exceed 2A/µs and output capacitance is limited |
| MPQ4433AGL-A-Z | 40V max VIN, 3.5A continuous, 17µA IQ, no spread spectrum, non-AEC-Q100 | Suitable for industrial IoT gateways but not automotive under-hood use due to temp and qualification gaps | Choose MPQ4433AGL-A-Z only for cost-sensitive, non-automotive designs requiring smaller footprint (3mm × 3mm) |
Compared with LT8640-1HUDC#TRPBF and MPQ4433AGL-A-Z, the LT8640HUDC#TRPBF uniquely balances ultralow IQ (2.5µA), AEC-Q100 H-grade reliability, and Silent Switcher EMI suppression - making it optimal for always-on automotive subsystems where battery drain and EMC certification are co-critical.
Availability
LT8640HUDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8640HUDC#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 automotive, industrial, communications, and healthcare markets.
The LT8640/LT8640-1 belongs to Analog Devices' Silent Switcher DC/DC regulator product line, engineered specifically for automotive and industrial applications demanding ultra-low EMI, high efficiency across wide load ranges, and extended temperature reliability.
FAQ
What is the maximum junction temperature rating for the LT8640HUDC#TRPBF?
The LT8640HUDC#TRPBF is an H-grade device rated for operation from –40°C to 150°C junction temperature. This qualification enables use in under-hood automotive applications such as engine control units and transmission control modules where ambient temperatures exceed 125°C. Thermal derating applies above 125°C to ensure long-term reliability.
Does the LT8640HUDC#TRPBF support forced continuous conduction mode (FCCM)?
No, the LT8640HUDC#TRPBF does not support forced continuous conduction mode. It is the standard LT8640 variant, offering Burst Mode®, pulse-skipping, spread spectrum, and external synchronization. For FCCM functionality, the LT8640-1HUDC#TRPBF must be selected - its SYNC/MODE pin floats to enable forced continuous operation.
How is EMI performance achieved in the LT8640HUDC#TRPBF without external filters?
The LT8640HUDC#TRPBF achieves low EMI through Analog Devices' patented Silent Switcher architecture: symmetrical dual-input power paths, integrated bypass capacitors, and optimized internal layout minimize magnetic field loop area and common-mode noise. With proper PCB layout (tight SW loop, grounded exposed pads), it meets CISPR 25 Class 5 radiated limits without ferrite beads or metal shields.
What is the purpose of the dual VIN1/VIN2 and GND1/GND2 pins on the LT8640HUDC#TRPBF?
The dual VIN1/VIN2 and GND1/GND2 pins on the LT8640HUDC#TRPBF implement the Silent Switcher architecture's balanced input path. VIN1 and VIN2 each connect to separate 1µF local ceramic capacitors referenced to their respective GND1 and GND2 pins, creating two identical, anti-phase current loops that cancel magnetic fields - directly reducing radiated EMI at the source.
Can the LT8640HUDC#TRPBF be synchronized to an external clock, and what is the required signal specification?
Yes, the LT8640HUDC#TRPBF can be synchronized to an external clock applied to the SYNC/MODE pin. The clock must be a CMOS-level signal (0V to ~3.4V) with frequency between 200kHz and 3MHz, 50% ±10% duty cycle, and rise/fall times <10ns. During sync, the device operates in pulse-skipping mode and aligns positive SW transitions to the external clock edge.
LT8640HUDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 20-WFQFN, 18 Leads, 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):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.97V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 5A
- Frequency - Switching:
- 210kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LT8640HUDC#TRPBF FAQ
1.How can I place an order for LT8640HUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8640HUDC#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 LT8640HUDC#TRPBF reliable?
The price and inventory of LT8640HUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8640HUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8640HUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8640HUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8640HUDC#TRPBF?
LT8640HUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8640HUDC#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 LT8640HUDC#TRPBF?
For technical support, including LT8640HUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8640HUDC#TRPBF requirements.
6.How does Aetrix verify that LT8640HUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8640HUDC#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 LT8640HUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8640HUDC#TRPBF?
All LT8640HUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8640HUDC#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 LT8640HUDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8640HUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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