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Analog Devices Inc. LT8640EUDC-1#TRPBF
- Part No.:
- LT8640EUDC-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN, 18 Leads, Exposed Pad
- Datasheet:
-
LT8640EUDC-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,120
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Product details
Overview
LT8640EUDC-1#TRPBF from Analog Devices is a 42V, 5A synchronous step-down Silent Switcher regulator with forced continuous mode (FCM), 2.5µA quiescent current in regulation, 30ns minimum on-time, and integrated power MOSFETs. It delivers up to 96% efficiency at 1MHz (12VIN→5VOUT) and supports input ranges from 3.4V to 42V for automotive infotainment power rails.
For engineers reviewing the LT8640EUDC-1#TRPBF datasheet, LT8640EUDC-1#TRPBF pinout, LT8640EUDC-1#TRPBF application, or LT8640EUDC-1#TRPBF equivalent, key selection criteria include FCM operation for fast transient response, ultralow EMI via Silent Switcher architecture, spread spectrum modulation support, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LT8640EUDC-1#TRPBF implements peak current mode control with an internal 0.970V reference and programmable switching frequency (200kHz–3MHz via RT resistor). Its forced continuous mode eliminates pulse skipping, enabling consistent switching during light loads and supporting tight output voltage regulation under dynamic load steps.
Silent Switcher architecture uses symmetrical layout and integrated bypass capacitors to suppress common-mode EMI; spread spectrum modulation (±22% frequency dither) further reduces peak radiated emissions. The device tolerates inductor saturation safely and supports output soft-start/tracking via TR/SS pin with 1.9µA internal pull-up current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients and industrial 24V/36V rails without external pre-regulation. |
| Output Current | 5A continuous, 7A peak - sustains high-current bursts for CPU/GPU power domains in ADAS modules. |
| Quiescent Current | 2.5µA at full regulation - enables always-on systems (e.g., telematics wake-on-LIN) with multi-year battery life. |
| Min On-Time | 30ns - allows high-frequency, high-VIN-to-low-VOUT conversion (e.g., 42V→3.3V at 2MHz) without duty-cycle limitation. |
| EMI Performance | CISPR 25 Class 5 compliant with filter - meets stringent automotive radiated emission limits without added ferrite beads or shielding. |
| Thermal Rating | –40°C to +125°C junction - qualified for engine bay and under-hood applications per AEC-Q100 Grade E. |
| Switching Frequency | 200kHz–3MHz (RT-programmable) - enables optimization of size (high-freq) vs. efficiency (low-freq) in space-constrained PCBs. |
Pinout & Package
LT8640EUDC-1#TRPBF uses an 18-lead 3mm × 4mm plastic QFN package (UDC) with exposed SW pads (pins 21, 22) for thermal dissipation. Pin count and layout match JEDEC MO-220WEED, with pins 5 and 12 omitted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Accepts 3.3V–25V input; reduces VIN current draw by powering INTVCC from VOUT, improving light-load efficiency. |
| INTVCC (2) | Internal 3.4V regulator output | Bypassed with ≥1µF ceramic capacitor; powers gate drivers and control logic-no external loading permitted. |
| BST (3) | Bootstrap capacitor connection | Drives top MOSFET gate above VIN; requires 0.1µF low-ESR ceramic placed adjacent to IC for reliable high-side switching. |
| VIN1/VIN2 (4,13) | Main input power inputs | Dual input pins reduce high-frequency loop inductance; each requires dedicated 1µF local ceramic bypass to respective GND1/GND2. |
| GND1/GND2 (6,7,10,11) | Power switch return paths | Four dedicated ground pins minimize ground bounce; must be tied together and connected to solid ground plane beneath IC. |
| SW (8,9,21,22) | Switch node outputs | High-current switching nodes; exposed pads (21,22) must be soldered to SW copper for thermal performance (θJC = 12°C/W). |
| EN/UV (14) | Enable and undervoltage lockout | Hysteretic threshold (0.94V/1.06V) enables programmable VIN brownout protection using external resistor divider. |
| RT (15) | Frequency programming | Resistor to GND sets oscillator frequency (e.g., 60.4kΩ = ~700kHz); tolerance directly impacts switching accuracy. |
| TR/SS (16) | Soft-start and tracking | 1.9µA internal current source enables capacitor-based output ramp rate control; pulled low during fault for safe shutdown. |
| SYNC/MODE (17) | Operating mode selection | Configures Burst Mode (GND), FCM (float), spread spectrum (3–4V), or external sync (clock input) - defines transient behavior and EMI profile. |
| GND (18) | System ground reference | Signal ground for FB, PG, and error amplifier; must connect to same ground plane as GND1/GND2 but routed separately to avoid noise coupling. |
| PG (19) | Power good indicator | Open-drain output asserts high when FB is within ±7.5% of 0.970V and no faults exist; valid only if VIN > 3.4V. |
| FB (20) | Feedback voltage sense | Regulates to 0.970V ±0.6%; requires RC network (e.g., 4.7pF + resistor divider) for stability across load/temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Forced Continuous Mode (FCM) | Enables zero-current crossover elimination, delivering <100µs load-step response and stable regulation down to 0A output current. |
| Silent Switcher Architecture | Reduces radiated EMI by >30dB vs. conventional buck regulators, eliminating need for external EMI filters in most automotive designs. |
| Spread Spectrum Modulation | ±22% triangular dither applied to switching frequency lowers peak EMI amplitude, easing CISPR 25 Class 5 compliance testing. |
| Low Dropout Operation | Maintains regulation with only 100mV dropout at 1A, enabling high-efficiency 5V→3.3V conversion from marginal input sources. |
| AEC-Q100 Grade E Qualification | Validated for automotive use across –40°C to +125°C junction temperature, including HTOL, TC, and ESD testing per stress test plan. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module DC/DC |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codecs in head-unit systems with 12V/24V battery input and strict EMC requirements. IC Role / Device Role / Timing Role: Primary 5V/3.3V step-down regulator with FCM for low-noise digital rail generation and spread spectrum for EMI suppression. Use Value: Eliminates need for external EMI filters while maintaining <10mVP-P output ripple and supporting 5A peak SoC current bursts. | Use Scenario: Supplies image sensor, ISP, and SerDes in rear-view or surround-view camera modules operating in hot under-hood environments. IC Role / Device Role / Timing Role: High-reliability 3.3V/1.8V converter with AEC-Q100 qualification and thermal shutdown at 150°C junction. Use Value: Sustains operation at 125°C ambient with 40°C/W θJA, enabling compact placement near heat-generating CMOS sensors. |
| Industrial PLC I/O Power | GSM Base Station RF Power Amplifier Bias |
Use Scenario: Generates isolated 5V/24V auxiliary rails for analog input/output modules in programmable logic controllers with 24VDC field bus input. IC Role / Device Role / Timing Role: Wide-input buck converter with UVLO hysteresis and robust EN/UV control for brownout immunity in noisy factory environments. Use Value: Maintains regulation during 42V transients and delivers 5A continuous current with <2.5µA quiescent draw during sleep states. | Use Scenario: Provides clean, low-noise 5V bias for GaAs/GaN RF power amplifiers in cellular infrastructure equipment requiring high PSRR and low EMI. IC Role / Device Role / Timing Role: Low-ripple, high-PSSR DC/DC stage preceding PA driver stages; operates at 2MHz to avoid interference with GSM 900/1800MHz bands. Use Value: Achieves <10mVP-P ripple and >65dB PSRR at 100kHz, preventing AM-to-PM distortion in RF signal chains. |
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 |
|---|---|---|---|
| LT8640EUDC#TRPBF | Pulse-skipping mode instead of FCM; lacks forced continuous operation and 7A peak current rating. | Suitable for lower-transient applications where Burst Mode efficiency is prioritized over load-step response. | Select when ultralow IQ (<2.5µA) at light loads outweighs need for fast transient recovery. |
| LM61480QRNLRQ1 | 42V, 8A automotive buck; higher current rating but 7.5µA IQ and no spread spectrum; uses different pinout and compensation scheme. | Preferred for higher-power ADAS ECUs requiring >5A, but requires re-layout and loop compensation redesign. | Choose when system demands >5A continuous output and can accommodate larger solution size and higher quiescent current. |
Compared with LT8640EUDC#TRPBF and LM61480QRNLRQ1, the LT8640EUDC-1#TRPBF uniquely balances 5A capability, 2.5µA IQ, FCM for sub-100µs transients, and integrated spread spectrum-making it optimal for space-constrained, EMI-sensitive automotive modules where both efficiency and dynamic performance are critical.
Availability
LT8640EUDC-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and industrial PLC I/O power supplies requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LT8640EUDC-1#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 precision instrumentation, industrial automation, and automotive markets.
The LT8640/LT8640-1 product line was designed specifically for automotive and industrial applications demanding ultra-low EMI, high efficiency across wide load ranges, and robust operation in harsh thermal and electrical environments.
FAQ
What is the maximum output current capability of the LT8640EUDC-1#TRPBF?
The LT8640EUDC-1#TRPBF delivers 5A continuous output current and supports 7A peak transient current. This rating is validated under thermal conditions with proper PCB copper area and airflow; derating applies above 85°C ambient. The device's 7A peak capability enables short-duration CPU/GPU burst loads in automotive domain controllers without output collapse.
How does the SYNC/MODE pin configure forced continuous mode on the LT8640EUDC-1#TRPBF?
On the LT8640EUDC-1#TRPBF, forced continuous mode (FCM) is activated when the SYNC/MODE pin is left floating (high-impedance), with leakage current <1µA. In FCM, the bottom MOSFET conducts negative inductor current, ensuring uninterrupted switching and fast load-step response. This differs from the LT8640EUDC#TRPBF, which enters pulse-skipping mode when SYNC/MODE is floating.
Can the LT8640EUDC-1#TRPBF operate with a 3.3V input voltage?
No-the LT8640EUDC-1#TRPBF has a minimum input voltage of 3.4V per its absolute maximum ratings and electrical characteristics table. Attempting operation below 3.4V may result in unstable regulation or startup failure. For 3.3V-input applications, consider a buck-boost or LDO solution upstream of the LT8640EUDC-1#TRPBF.
What thermal considerations apply to the LT8640EUDC-1#TRPBF in a 125°C ambient environment?
In a 125°C ambient environment, the LT8640EUDC-1#TRPBF's junction temperature must remain ≤125°C (Grade E rating). With θJA = 40°C/W, power dissipation must stay below 0W-meaning full derating is required. Realistically, operation at 125°C ambient demands aggressive heatsinking, reduced load current, or forced airflow to maintain safe junction temperatures.
Does the LT8640EUDC-1#TRPBF support output voltage tracking during power-up?
Yes-the LT8640EUDC-1#TRPBF supports output voltage tracking via the TR/SS pin. When TR/SS voltage is below 0.97V, the regulator forces FB to equal TR/SS voltage, enabling precise sequencing with other rails. An internal 1.9µA current source allows simple RC-based ramp control; the pin is actively pulled low during faults to halt ramping.
LT8640EUDC-1#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-1#TRPBF FAQ
1.How can I place an order for LT8640EUDC-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8640EUDC-1#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-1#TRPBF reliable?
The price and inventory of LT8640EUDC-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8640EUDC-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8640EUDC-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8640EUDC-1#TRPBF?
LT8640EUDC-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8640EUDC-1#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-1#TRPBF?
For technical support, including LT8640EUDC-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8640EUDC-1#TRPBF requirements.
6.How does Aetrix verify that LT8640EUDC-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8640EUDC-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8640EUDC-1#TRPBF?
All LT8640EUDC-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8640EUDC-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT8640EUDC-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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