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Analog Devices Inc. LT8640EUDC#TRPBF
- Part No.:
- LT8640EUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN, 18 Leads, Exposed Pad
- Datasheet:
-
LT8640EUDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,681
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Product details
Overview
LT8640EUDC#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 integrated power MOSFETs. It delivers up to 96% efficiency at 1MHz (12VIN→5VOUT), supports 200kHz–3MHz programmable switching frequency via RT pin, and operates across –40°C to 125°C junction temperature.
For engineers reviewing the LT8640EUDC#TRPBF datasheet, LT8640EUDC#TRPBF pinout, LT8640EUDC#TRPBF application, or LT8640EUDC#TRPBF equivalent, key selection criteria include ultralow EMI performance (CISPR 25 Class 5 compliant), Burst Mode® operation for battery-powered systems, forced continuous mode compatibility (via LT8640-1 variants), and side-wettable QFN thermal reliability in automotive and industrial DC/DC conversion.
Technical Context
The LT8640EUDC#TRPBF employs peak current mode control with internal 0.97V reference and slope compensation, enabling stable operation with fast transient response. Its Silent Switcher® architecture uses dual input paths and integrated bypass capacitors to suppress magnetic field emissions, achieving <10mVP-P output ripple and low radiated EMI without external filters.
It features a 30ns minimum top-switch on-time for high VIN-to-low VOUT conversion (e.g., 42V→3.3V at 2MHz), programmable spread spectrum modulation (±22% frequency dither), and robust protection including overtemperature shutdown, input UVLO (3.4V), and PG open-drain fault indicator with ±8% output voltage monitoring.
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 | 5A continuous, 7A peak - enables single-chip 5V/5A or 3.3V/5A supplies without external current sharing. |
| Quiescent Current | 2.5µA at full regulation - extends battery life in always-on IoT sensors and telematics modules. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows compact magnetics (e.g., 1µH at 3MHz) and avoids AM radio band interference. |
| Min On-Time | 30ns - enables high-step-down ratios (e.g., 42V→3.3V) at high frequencies without pulse skipping. |
| EMI Performance | CISPR 25 Class 5 radiated/ conducted compliance - eliminates need for external EMI filters in automotive infotainment and ADAS designs. |
| Package Thermal RθJA | 40°C/W - enables 5A operation at ambient ≤85°C with standard 2-layer PCB and 2cm² copper pour. |
Pinout & Package
LT8640EUDC#TRPBF is housed in an 18-lead 3mm × 4mm plastic QFN package with exposed SW pads (pins 21, 22) for enhanced thermal dissipation. The package is RoHS-compliant, lead-free, and side-wettable capable (UDC variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Reduces VIN current draw when tied to VOUT ≥3.3V; improves light-load efficiency by powering INTVCC from BIAS instead of VIN. |
| 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 | Drives high-side NMOS gate above VIN; requires 0.1µF ceramic capacitor placed adjacent to IC. |
| VIN1/VIN2 (4,13) | Dual input power rails | Each requires dedicated 1µF local ceramic bypass; reduces high-frequency input current loop area and EMI. |
| GND1/GND2 (6,7,10,11) | Power switch return paths | Must be tied together and connected to low-impedance ground plane; minimizes switching node ringing and ground bounce. |
| SW (8,9,21,22) | Power switch output node | Exposed pad (21,22) must be soldered to SW trace for thermal and EMI performance; connects to inductor and BST cap. |
| EN/UV (14) | Enable and input undervoltage lockout | Hysteretic threshold (0.96V/1.00V) enables programmable VIN start-up; tie to VIN if always-on operation required. |
| RT (15) | Frequency programming resistor | Resistor to GND sets fSW: 221kΩ = 210kHz, 60.4kΩ = 700kHz, 18.2kΩ = 2.0MHz - enables precise EMI band avoidance. |
| TR/SS (16) | Soft-start and output tracking | 1.9µA internal current source enables RC-controlled ramp rate; supports power sequencing with other rails. |
| SYNC/MODE (17) | Operating mode selection | Ground = Burst Mode; float = pulse-skipping (LT8640); high = spread spectrum or external sync - configures EMI vs. efficiency trade-off. |
| GND (18) | Signal ground reference | Connects to system ground and PCB ground plane; separates signal integrity from power ground loops. |
| PG (19) | Power good open-drain output | Asserts high when FB is within ±8% of 0.97V and no faults exist; valid only when VIN >3.4V. |
| FB (20) | Feedback voltage sense | Regulates to 0.970V ±0.006V; requires 4.7pF–22pF phase-lead capacitor from FB to VOUT for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Dual input paths + integrated bypass caps reduce magnetic field emissions by >30dB vs. conventional buck converters, meeting CISPR 25 Class 5 without shielding. |
| Ultralow Quiescent Current | 2.5µA IQ in Burst Mode maintains regulation at microamp loads - critical for 10-year battery life in smart meters and wireless sensors. |
| 30ns Minimum On-Time | Enables direct 42V→3.3V conversion at 2MHz, eliminating intermediate stages and reducing BOM count in high-voltage industrial PLCs. |
| Spread Spectrum Modulation | ±22% triangular dither spreads EMI energy across 3MHz bandwidth, lowering peak emissions by 10–15dB and easing EMC certification. |
| Forced Continuous Mode Support | Compatible with LT8640-1 variants for applications requiring zero-current crossover elimination and improved load-transient response in FPGA core supplies. |
| AEC-Q100 Qualified Options | Automotive-grade variants (e.g., LT8640JUDCF#WTRPBF) are available with extended temperature range (–40°C to 150°C) and PPAP documentation. |
Applications
| Automotive Infotainment Power | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering 5V/3A display controller and audio codec in head unit under 12V battery with load dump transients. IC Role / Device Role / Timing Role: Primary 42V-input synchronous buck regulator with integrated MOSFETs and EMI-hardened layout. Use Value: Eliminates external EMI filter components, reduces board area by 35%, and sustains regulation during 60V/50ms load dump events per ISO 7637-2. | Use Scenario: Supplying 3.3V/100mA to LoRaWAN sensor node operating on coin-cell battery for 10+ years. IC Role / Device Role / Timing Role: Ultra-low-IQ step-down converter with programmable soft-start and power-good signaling. Use Value: Achieves 2.5µA no-load IQ and 92% efficiency at 100µA load, extending battery life beyond 10 years while maintaining accurate voltage regulation. |
| Telecom Remote Radio Unit | Medical Portable Diagnostic Device |
Use Scenario: Generating 5V/4A for FPGA and ADC in outdoor RRH unit exposed to –40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC converter with programmable frequency and thermal shutdown. Use Value: Delivers full 5A output at 85°C ambient using standard 2-layer PCB, with thermal derating curve validated per JEDEC 51-7. | Use Scenario: Providing 3.3V/2A for ultrasound imaging processor and analog front-end in handheld diagnostic tool. IC Role / Device Role / Timing Role: Low-noise, low-ripple power supply with fast transient response and medical-grade reliability. Use Value: Output ripple <10mVP-P ensures clean analog signal chain; PG pin enables safe power sequencing before FPGA configuration. |
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 |
|---|---|---|---|
| LT8640-1EUDC#TRPBF | Forced Continuous Mode (FCM) enabled by default; higher light-load IQ (≈100µA); identical pinout and package. | Better transient response for FPGA/core logic supplies; unsuitable for ultra-low-power always-on sensors. | Select LT8640-1EUDC#TRPBF when fast load steps (<1µs) and zero-current crossover are required; otherwise prefer LT8640EUDC#TRPBF for lowest IQ. |
| MPQ4420AGL-AEC1-P | 45V/2A AEC-Q100 automotive buck; 17µA IQ; fixed 2.2MHz frequency; no spread spectrum or SYNC pin. | Limited current and EMI flexibility; certified for automotive but lacks programmable features. | Choose MPQ4420AGL-AEC1-P only for cost-sensitive automotive body electronics where 2A suffices and EMI filtering is acceptable. |
Compared with LT8640-1EUDC#TRPBF and MPQ4420AGL-AEC1-P, the LT8640EUDC#TRPBF uniquely balances ultralow IQ (2.5µA), 5A capability, and programmable EMI reduction - making it optimal for high-reliability, battery-constrained, and EMI-sensitive applications where both performance and design flexibility are mandatory.
Availability
LT8640EUDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial IoT sensor nodes, telecom remote radio units, and medical portable diagnostic devices requiring stable component supply, long-term lifecycle support, and AEC-Q100-compatible alternatives.
Supply support for LT8640EUDC#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8640 product line delivers high-efficiency, low-EMI synchronous buck regulators for demanding power conversion applications where reliability, thermal performance, and electromagnetic compatibility are critical design constraints.
FAQ
What is the maximum input voltage rating for the LT8640EUDC#TRPBF?
The LT8640EUDC#TRPBF has an absolute maximum input voltage rating of 42V on VIN1 and VIN2 pins. It operates continuously across a recommended input range of 3.4V to 42V, supporting automotive battery systems including cold-crank (down to ~3.4V) and load-dump (up to 42V) conditions without external protection circuitry.
Does the LT8640EUDC#TRPBF support spread spectrum modulation, and how is it enabled?
Yes, the LT8640EUDC#TRPBF supports spread spectrum modulation to reduce EMI peaks. It is enabled by tying the SYNC/MODE pin to INTVCC (~3.4V) or an external 3V–4V supply. This configures ±22% triangular frequency dither around the RT-set base frequency (e.g., 2MHz → 1.56–1.92MHz), lowering radiated emissions by 10–15dB in CISPR 25 testing.
Can the LT8640EUDC#TRPBF operate with a 3.3V output at 5A from a 24V input?
Yes, the LT8640EUDC#TRPBF can deliver 5A at 3.3V from a 24V input. Its 30ns minimum on-time enables this high step-down ratio at 2MHz (using RT = 18.2kΩ), achieving >90% efficiency. Use a 2.2µH inductor and ensure adequate PCB copper area on the SW and GND planes to maintain thermal performance below 125°C junction temperature.
What is the function of the TR/SS pin on the LT8640EUDC#TRPBF, and how is it used for soft-start?
TR/SS is the soft-start and tracking pin on the LT8640EUDC#TRPBF. An internal 1.9µA current source charges an external capacitor connected to this pin, controlling output voltage ramp rate. For example, a 10nF capacitor yields ~50ms soft-start time. During startup, the FB pin is regulated to match TR/SS voltage until it exceeds 0.97V, then transitions to normal regulation.
Is the LT8640EUDC#TRPBF pin-compatible with the LT8640-1EUDC#TRPBF?
Yes, the LT8640EUDC#TRPBF is pin-compatible with the LT8640-1EUDC#TRPBF - same 18-lead 3mm × 4mm QFN package, identical pinout, and shared electrical specifications except for SYNC/MODE behavior and light-load operating mode. No PCB redesign is needed when migrating between them, though firmware or external resistor networks may require adjustment to match desired mode selection.
LT8640EUDC#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LT8640EUDC#TRPBF FAQ
1.How can I place an order for LT8640EUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8640EUDC#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 LT8640EUDC#TRPBF reliable?
The price and inventory of LT8640EUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8640EUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8640EUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8640EUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8640EUDC#TRPBF?
LT8640EUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8640EUDC#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 LT8640EUDC#TRPBF?
For technical support, including LT8640EUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8640EUDC#TRPBF requirements.
6.How does Aetrix verify that LT8640EUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8640EUDC#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 LT8640EUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8640EUDC#TRPBF?
All LT8640EUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8640EUDC#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 LT8640EUDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8640EUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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