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Analog Devices Inc. LT8642EV-1#TRPBF
- Part No.:
- LT8642EV-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8642EV-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 10A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,025
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Product details
Overview
LT8642EV-1#TRPBF from Analog Devices is a 2.8V–18V input, 10A synchronous step-down DC/DC regulator with Silent Switcher® architecture, 20ns minimum on-time, external VC compensation, and spread-spectrum EMI reduction. It delivers up to 96% efficiency at 1MHz (12VIN→3.3VOUT) and operates in Burst Mode (240µA IQ) or forced continuous mode for noise-sensitive server, automotive, and industrial power supplies.
For engineers reviewing the LT8642EV-1#TRPBF datasheet, LT8642EV-1#TRPBF pinout, LT8642EV-1#TRPBF application, or LT8642EV-1#TRPBF equivalent, key selection criteria include ultralow radiated/conducted EMI performance per CISPR 32 Class B, 3mm × 4mm LQFN thermal design, 0.597V feedback reference accuracy, and synchronization capability via CLKOUT/SYNC/MODE pins for multi-rail systems.
Technical Context
The LT8642EV-1#TRPBF implements peak current-mode control with a 20ns minimum on-time and frequency foldback during startup or overcurrent, enabling high step-down ratios (e.g., 12VIN→1.2VOUT) at 2MHz switching. Its Silent Switcher architecture uses symmetrical layout and integrated bypass capacitors to suppress common-mode EMI without external filters.
Operation modes are selected via the SYNC/MODE pin: ground for Burst Mode (230µA IQ), floating for forced continuous mode (fast transient response, negative inductor current), >3V for spread-spectrum modulation (±20% frequency dither), or driven clock for external synchronization. The VC pin provides full loop compensation and current sharing capability across parallel regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 18V - supports wide industrial and automotive battery inputs including cold-crank transients. |
| Output Current | 10A continuous - enables single-chip 12V-to-1.2V/1.8V/3.3V conversion for FPGA, ASIC, and SoC core rails. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows optimization of size vs. efficiency; 2MHz typical for compact 0.28µH inductors. |
| Feedback Reference | 0.597V ±3mV - high-accuracy reference enables tight output regulation (±1%) across line/load/temperature. |
| Quiescent Current | 240µA in Burst Mode at 12VIN→1.2VOUT - extends battery life in always-on systems without sacrificing low-load efficiency. |
| EMI Performance | CISPR 32 Class B compliant with no external EMI filter - reduces system-level filtering cost and board area in noise-critical applications. |
| Min On-Time | 20ns - supports high-frequency, high-step-down operation (e.g., 12VIN→1.2VOUT at 2MHz) without pulse-skipping instability. |
Pinout & Package
LT8642EV-1#TRPBF is housed in a thermally enhanced 20-lead 3mm × 4mm LQFN package with exposed pad (Pin 21 = GND). The package footprint matches standard 3mm × 4mm QFN layouts and requires soldering the exposed pad to PCB ground for optimal thermal performance (θJC(bottom) = 8.0°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG (1) | Open-drain Power Good | Asserts high when FB is within ±8% of 0.597V and no fault (UVLO, thermal shutdown); used for system sequencing and fault reporting. |
| BIAS (2) | Bias Supply Input | Reduces VIN current draw by powering internal circuitry from VOUT (≥3.3V) or external ≥3.1V supply; improves light-load efficiency. |
| INTVCC (3) | Internal 3.4V Regulator Bypass | Requires ≥1µF ceramic capacitor to GND; supplies gate drivers and control logic; sourced from BIAS if active, else VIN. |
| VIN (4,5,12,13) | Main Input Power | Four dedicated pins minimize IR drop and parasitic inductance; require local 1µF + 1µF + ≥4.7µF ceramic input capacitance. |
| GND (6,11,21) | Power & Signal Ground | Pins 6/11 are signal GND; Pin 21 is exposed thermal pad - must be soldered to PCB ground plane for thermal integrity. |
| BST (7) | Bootstrap Capacitor Node | Drives high-side MOSFET gate above VIN; requires 47nF low-ESR ceramic capacitor placed adjacent to IC. |
| SW (8–10) | Switch Node | Three paralleled pins connect to inductor; low-inductance routing critical for EMI and efficiency; keep trace area minimal. |
| EN/UV (14) | Enable / Input UVLO | Hysteretic enable threshold (0.99V rise / 0.95V fall); resistor divider sets custom input undervoltage lockout point. |
| SYNC/MODE (15) | Mode Selection / Sync Input | Configures Burst Mode (GND), FCM (float), spread spectrum (≥3V), or external sync (clock input); controls operating behavior. |
| CLKOUT (16) | Switching Clock Output | Provides ~200ns pulses at fSW in FCM/spread-spectrum/sync modes; enables precise timing coordination of multiple regulators. |
| RT (17) | Frequency Set Resistor | Resistor to GND programs fSW from 200kHz to 3MHz; e.g., 60.4kΩ → 2MHz; enables size/efficiency tradeoff tuning. |
| SS (18) | Soft-Start / Tracking | 1.9µA internal pull-up enables capacitor-based voltage ramp; supports output tracking during power-up sequences. |
| VC (19) | Error Amplifier Output | Direct access to compensation node; RC network from VC to GND sets loop bandwidth and phase margin for fast transient response. |
| FB (20) | Feedback Input | Regulates to 0.597V; connects to resistor divider tap; requires 47pF phase-lead capacitor to VOUT for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Integrated dual-input paths and symmetrical layout reduce common-mode EMI by >30dB vs. conventional buck regulators - eliminates need for ferrite beads or metal shields. |
| Spread Spectrum Modulation | ±20% triangular frequency dither (e.g., 2MHz → 1.6–2.4MHz) lowers peak radiated emissions to meet CISPR 32 Class B without EMI filter components. |
| External VC Compensation | Full control over error amplifier compensation enables optimized transient response for diverse output capacitors (ceramic/polymer) and load profiles (e.g., CPU burst loads). |
| 20ns Minimum On-Time | Enables direct 12V-to-1.2V conversion at 2MHz without requiring pulse-skipping or external pre-regulators - simplifies BOM and layout. |
| Burst Mode Efficiency | 240µA quiescent current at no load maintains >85% efficiency down to 1mA output current - ideal for always-on IoT and automotive standby rails. |
| CLKOUT Synchronization | Provides precise switch-node timing reference to coordinate multiple LT8642EV-1#TRPBF or compatible regulators - eliminates beat frequencies and reduces system-level ripple. |
Applications
| Server Core Power | Automotive ADAS Camera Module |
|---|---|
Use Scenario: Providing 1.2V/10A core voltage to Xilinx Kria KV260 or AMD Versal AI Core SoCs in data center accelerators. IC Role / Device Role / Timing Role: Primary high-current step-down regulator with synchronized CLKOUT to align with DDR memory power rails. Use Value: Silent Switcher architecture meets stringent server EMI requirements without shielding, while 20ns on-time avoids pre-regulator stages and saves board space. | Use Scenario: Generating 3.3V/5A and 1.8V/3A rails for image sensor, ISP, and MIPI interface in 12V automotive camera ECU. IC Role / Device Role / Timing Role: Dual-output power solution using two LT8642EV-1#TRPBF in master-slave sync mode for low-noise imaging chain. Use Value: Burst Mode IQ <250µA extends parking-mode battery life; spread spectrum ensures compliance with CISPR 25 Class 5 radiated limits. |
| Industrial PLC I/O Module | Medical Point-of-Care Ultrasound |
Use Scenario: Delivering isolated 5V/3A and 3.3V/2A auxiliary rails from 24VDC field bus in programmable logic controller backplane. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with EN/UV programmable undervoltage lockout for brownout protection. Use Value: Wide 2.8–18V input range accommodates 24V nominal with ±25% tolerance; 125°C junction rating supports convection-cooled enclosures. | Use Scenario: Powering FPGA, ADC, and RF front-end in portable ultrasound probe with strict low-noise and low-power constraints. IC Role / Device Role / Timing Role: Low-ripple, low-EMI core supply where switching noise could interfere with analog receive path. Use Value: <10mVP-P output ripple and CISPR 32 Class B compliance prevent artifacts in B-mode imaging; SS pin enables controlled power-up sequencing. |
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 |
|---|---|---|---|
| LT8643EFE#TRPBF | Same family, 20V max input, 8A output, 3mm × 4mm LQFN, but lacks spread-spectrum modulation and has higher 0.6V FB reference. | Lower current and no spread spectrum limit suitability for high-EMI environments like medical imaging or automotive radar. | Select when 8A output suffices and EMI filtering budget is available; not drop-in due to different FB voltage and missing SS feature. |
| TPS546D24RSAR | 6–18V input, 10A, PMBus-enabled, 3.5mm × 3.5mm VQFN, 0.6V FB, but no Silent Switcher architecture or spread spectrum. | Lacks integrated EMI mitigation - requires external filters to meet CISPR 32; adds digital configuration overhead. | Choose for systems needing telemetry and dynamic voltage scaling; avoid when board space or EMI certification time is constrained. |
Compared with LT8643EFE#TRPBF and TPS546D24RSAR, the LT8642EV-1#TRPBF uniquely combines 10A output, 20ns on-time, Silent Switcher EMI suppression, and spread-spectrum modulation in a 3mm × 4mm package - making it the only option that achieves CISPR 32 Class B compliance without external filtering at full 10A load.
Availability
LT8642EV-1#TRPBF is available at Aetrix Electronics and suitable for server power applications, automotive ADAS systems, and industrial PLC modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for LT8642EV-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 power management semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.
The LT8642-1 product line was designed specifically for high-density, low-EMI power conversion in noise-sensitive applications such as data center servers, automotive radar, and medical imaging - emphasizing Silent Switcher architecture, wide input range, and robust thermal performance.
FAQ
What is the maximum recommended junction temperature for continuous operation of the LT8642EV-1#TRPBF?
The LT8642EV-1#TRPBF is rated for continuous operation up to 125°C junction temperature. Its thermal design - including the exposed pad (Pin 21) soldered to PCB ground and θJC(bottom) = 8.0°C/W - enables reliable 10A output at ambient temperatures up to 85°C with proper airflow or heatsinking. Operation above 125°C triggers thermal shutdown.
Can the LT8642EV-1#TRPBF operate with an input voltage below 2.8V?
No. The LT8642EV-1#TRPBF has a minimum specified input voltage of 2.8V under all conditions. Attempting to operate below this threshold may result in unstable regulation, failure to start, or undefined behavior. The absolute maximum rating for VIN is 18V, and the device includes input UVLO with a programmable EN/UV pin threshold.
How does the LT8642EV-1#TRPBF achieve CISPR 32 Class B radiated emissions compliance without external EMI filters?
The LT8642EV-1#TRPBF achieves CISPR 32 Class B compliance through its patented Silent Switcher® architecture - featuring symmetrical internal power loops, integrated input capacitors, and optimized pinout - which inherently minimizes common-mode EMI. When combined with proper PCB layout (small SW/BST loops, grounded exposed pad), it meets limits up to 30MHz without added filters, as verified on the DC2560A demo board.
What is the function of the VC pin on the LT8642EV-1#TRPBF, and how is it used in loop compensation?
On the LT8642EV-1#TRPBF, the VC pin is the output of the internal error amplifier and directly controls peak switch current. An RC network from VC to GND sets the compensation poles/zeros for the control loop - enabling optimization of phase margin and transient response for specific output capacitors and load dynamics. It also supports current sharing in parallel configurations.
Is the LT8642EV-1#TRPBF pin-compatible with the LT8642S variant?
No. The LT8642EV-1#TRPBF uses a 20-lead 3mm × 4mm LQFN package, while the LT8642S is in a 4mm × 4mm LQFN package with different pin count and layout. Although both share the same functional block diagram and electrical specifications, their physical footprints, thermal pads, and pin assignments are incompatible - requiring separate PCB designs.
LT8642EV-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 20-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):
- 2.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 10A
- Frequency - Switching:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LQFN (3x4)
LT8642EV-1#TRPBF FAQ
1.How can I place an order for LT8642EV-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8642EV-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 LT8642EV-1#TRPBF reliable?
The price and inventory of LT8642EV-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 LT8642EV-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8642EV-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8642EV-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8642EV-1#TRPBF?
LT8642EV-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8642EV-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 LT8642EV-1#TRPBF?
For technical support, including LT8642EV-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8642EV-1#TRPBF requirements.
6.How does Aetrix verify that LT8642EV-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8642EV-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 LT8642EV-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8642EV-1#TRPBF?
All LT8642EV-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8642EV-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 LT8642EV-1#TRPBF part is unused and in its original packaging.
Return procedure for LT8642EV-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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