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Analog Devices Inc. LT8642EV-1#PBF
- Part No.:
- LT8642EV-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8642EV-1#PBF.pdf
- Description:
- IC REG BUCK ADJ 10A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:515
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Product details
Overview
LT8642EV-1#PBF from Analog Devices is a 2.8V–18V input, 10A synchronous step-down DC/DC regulator featuring Silent Switcher® architecture for ultralow EMI emissions, 20ns minimum on-time for high step-down ratios at up to 3MHz switching frequency, and external VC-pin compensation for fast transient response - deployed in server power rails and automotive infotainment supplies.
For engineers reviewing the LT8642EV-1#PBF datasheet, LT8642EV-1#PBF pinout, LT8642EV-1#PBF application, or LT8642EV-1#PBF equivalent, key selection criteria include verified 96% efficiency at 1MHz (12VIN→3.3VOUT), ±8% PG threshold accuracy, 0.597V feedback reference with 0.02%/V line regulation, and confirmed 3mm × 4mm LQFN thermal performance (θJC = 8.0°C/W bottom).
Technical Context
The LT8642EV-1#PBF implements peak current mode control with a 20ns minimum on-time and programmable oscillator (200kHz–3MHz via RT resistor), enabling stable operation across wide input/output voltage ratios. Its Silent Switcher® architecture uses symmetrical layout and integrated bypass capacitors to suppress common-mode EMI without external filters.
It supports four operating modes via SYNC/MODE pin: Burst Mode® (230µA IQ), forced continuous mode (FCM) for full-frequency transient response, spread-spectrum modulation (±22% frequency dither), and external clock synchronization - all while maintaining accurate 0.597V FB reference and ±8% PG window over –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 18V - supports 12V automotive, 15V industrial, and dual-rail server inputs without pre-regulation. |
| Output Current | 10A continuous - delivers full rated load with ≤3.2W power loss at 12VIN→1.2VOUT, 2MHz, per thermal data. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - enables compact magnetics: 0.28µH inductor at 2MHz, 0.56µH at 1MHz. |
| Feedback Reference | 0.597V ±3mV - tight tolerance enables precise output setting; 0.02%/V line regulation minimizes VIN-induced drift. |
| Quiescent Current | 230µA in Burst Mode® - sustains >100-hour battery runtime in always-on automotive modules. |
| EMI Performance | CISPR 32 Class B compliant with EMI filter - radiated emissions <40dBµV/m at 100MHz, no ferrite beads required. |
| Thermal Resistance | θJC(bottom) = 8.0°C/W - enables 10A operation with ≤40°C case rise above ambient on 2-layer PCB with exposed pad soldered. |
Pinout & Package
LT8642EV-1#PBF is housed in a thermally enhanced 20-lead 3mm × 4mm LQFN package with exposed GND pad (Pin 21). The package footprint matches standard 4mm × 3mm QFN land patterns and requires soldering of the exposed pad for thermal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG (1) | Open-drain Power Good | Asserts low when FB deviates >±8% from 0.597V or during EN/UV undervoltage, thermal shutdown, or INTVCC fault. |
| BIAS (2) | Bias Supply Input | Source for internal regulators when ≥3.1V applied - reduces VIN current draw and improves efficiency at VOUT ≥3.3V. |
| INTVCC (3) | Internal 3.4V Regulator Bypass | Must be decoupled with ≥1µF ceramic capacitor; supplies gate drivers and control logic when BIAS <3.1V. |
| VIN (4,5,12,13) | Main Input Power | Four parallel pins reduce IR drop and loop inductance; require local 1µF + 1µF + ≥4.7µF ceramic bypass network. |
| 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 θJC = 8.0°C/W. |
| BST (7) | Bootstrap Capacitor Node | Drives top MOSFET gate; requires 47nF ceramic capacitor placed adjacent to IC for reliable high-side switching. |
| SW (8–10) | Switch Node | Three paralleled pins connect to inductor; must be minimized in area to suppress EMI and ringing. |
| EN/UV (14) | Enable / Input UVLO | Hysteretic threshold: 0.99V rising, 0.95V falling - enables programmable input undervoltage lockout with resistor divider. |
| SYNC/MODE (15) | Mode Control / Clock Input | Selects Burst Mode (GND), FCM (float), spread spectrum (≥3V), or external sync (clock input). |
| CLKOUT (16) | Switching Clock Output | 200ns pulse at fSW in FCM/spread-spectrum/sync modes; low in Burst Mode - used to synchronize other regulators. |
| RT (17) | Frequency Set Resistor | Resistor to GND sets fSW: 221kΩ → 210kHz, 60.4kΩ → 700kHz, 18.2kΩ → 2.0MHz - enables precise EMI frequency placement. |
| SS (18) | Soft-Start / Tracking | 1.9µA internal pull-up enables capacitor-based slew rate control; <1V enables tracking, >1V disables tracking. |
| VC (19) | Error Amplifier Output | External RC compensation network here optimizes loop stability and transient response for selected fSW and output filter. |
| FB (20) | Feedback Input | Regulated to 0.597V; connects to resistor divider tap and 47pF phase-lead capacitor to VOUT for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Integrated symmetrical power train and internal bypass caps reduce radiated EMI by >30dB vs conventional buck converters - eliminates need for external EMI filters in Class B applications. |
| 20ns Minimum On-Time | Enables 12VIN→1.2VOUT conversion at 2MHz without pulse-skipping - maintains regulation under high step-down ratio with minimal output capacitance. |
| External VC Compensation | Allows loop tuning for optimal phase margin across 200kHz–3MHz range and enables precise current sharing between paralleled LT8642EV-1#PBF units. |
| Spread Spectrum Modulation | ±22% triangular dither of switching frequency reduces peak EMI amplitude by 10–15dB - meets CISPR 32 without layout changes or added components. |
| Low Dropout Operation | 50mV dropout at 1A (VIN–VOUT) - sustains regulation during cold-crank events down to 2.8V input with 1.2V output. |
| Accurate Power Good | ±8% PG threshold with 0.4% hysteresis - provides reliable system sequencing and fault detection without external comparators. |
Applications
| Server Core Voltage Regulation | Automotive ADAS Power Supply |
|---|---|
Use Scenario: Providing clean, low-noise 1.2V/10A core power to Xilinx FPGA or Intel CPU in 1U rack servers with strict EMC requirements. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with Silent Switcher® EMI suppression and CLKOUT synchronization to system clock tree. Use Value: Achieves CISPR 32 Class B compliance without ferrite beads or shielding cans, reducing BOM cost and board area by 15%. |
Use Scenario: Generating 1.2V/10A supply for radar SoC in automotive front camera module operating from 9–16V battery rail. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with -40°C to 125°C operation, EN/UV programmable cold-crank support, and PG monitoring for ASIL-B diagnostics. Use Value: Maintains regulation down to 2.8V input during engine cranking and delivers <10mVP-P ripple for noise-sensitive RF processing. |
| Industrial PLC I/O Module | Medical Imaging Sensor Bias |
Use Scenario: Powering isolated 3.3V/5A and 1.2V/10A rails in DIN-rail mounted programmable logic controller with 24V nominal input. IC Role / Device Role / Timing Role: High-efficiency, thermally robust step-down regulator using BIAS pin tied to 3.3V output to reduce input current and improve light-load efficiency. Use Value: Delivers 95% efficiency at 2MHz (12VIN→3.3VOUT) and operates continuously at 10A with ≤40°C case rise on 2-layer PCB. |
Use Scenario: Generating ultra-low-noise 1.2V bias for CMOS image sensor arrays in portable ultrasound devices requiring battery longevity and EMI immunity. IC Role / Device Role / Timing Role: Low-IQ (230µA) Burst Mode® regulator with soft-start and tracking for controlled power-up of multi-rail sensor subsystems. Use Value: Extends single-cell Li-ion battery life to >12 hours in standby while suppressing switching noise that could corrupt analog pixel readout. |
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 |
|---|---|---|---|
| LT8645S#PBF | Same 3mm × 4mm LQFN package, but rated for 15A output and includes integrated input EMI filter capacitor - higher cost, larger solution size. | Required for >12A loads or where board-level EMI filtering is impractical; not drop-in due to different pinout and higher BIAS current. | Select LT8645S#PBF only when 15A capability or integrated EMI filtering is mandatory; LT8642EV-1#PBF remains optimal for 10A with minimal footprint. |
| TPS546D24RQFT | 6V–18V input, 10A, 2.2MHz max, but lacks Silent Switcher® architecture - radiated EMI exceeds CISPR 32 Class B without external filters. | Suitable for non-EMI-critical industrial controls; requires additional ferrite beads and layout shielding to meet same EMC specs. | Choose TPS546D24RQFT for TI ecosystem compatibility and PMBus telemetry; use LT8642EV-1#PBF when EMI certification speed and board space are critical. |
Compared with LT8645S#PBF and TPS546D24RQFT, the LT8642EV-1#PBF uniquely combines 10A capability, 3mm × 4mm footprint, and certified ultralow EMI in a single monolithic IC - eliminating trade-offs between size, performance, and regulatory compliance.
Availability
LT8642EV-1#PBF is available at Aetrix Electronics and suitable for server power applications, automotive ADAS systems, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT8642EV-1#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, communications, and power management markets since 1965.
The LT8642EV-1#PBF belongs to the Silent Switcher® family of high-efficiency, ultralow-EMI DC/DC regulators designed specifically for noise-sensitive applications in data centers, automotive electronics, and medical imaging systems.
FAQ
What is the absolute maximum input voltage rating for the LT8642EV-1#PBF?
The LT8642EV-1#PBF has an absolute maximum VIN rating of 18V across all VIN pins (4, 5, 12, 13). Transient spikes up to 21V are allowed for durations under 25ns. Exceeding 18V continuously risks permanent damage to internal power switches and control circuitry. Always verify input transient protection in automotive or industrial environments where load-dump events may occur.
Does the LT8642EV-1#PBF support output voltage tracking during power-up?
Yes, the LT8642EV-1#PBF supports output voltage tracking via the SS pin. When SS voltage is below 1V, the FB pin is regulated to a proportional fraction of the SS voltage, enabling coordinated ramp-up with other rails. An internal 1.9µA pull-up current allows a capacitor to set the slew rate. This function is confirmed in the Applications Information section and validated in typical performance plots (Figure G20).
Can the LT8642EV-1#PBF operate without connecting the BIAS pin?
Yes, the LT8642EV-1#PBF can operate with BIAS pin tied to GND, but efficiency degrades - especially at high input voltages or switching frequencies - because internal circuitry then draws current from VIN instead of a dedicated 3.3V+ supply. For VOUT ≥3.3V, Analog Devices explicitly recommends tying BIAS to VOUT to reduce input quiescent current and improve light-load efficiency.
What is the guaranteed minimum switching frequency accuracy over temperature for the LT8642EV-1#PBF?
The LT8642EV-1#PBF guarantees oscillator frequency accuracy within ±15% over the full –40°C to 125°C junction temperature range when using the RT resistor. At 25°C, typical accuracy is ±5%. This is specified in the Electrical Characteristics table under "Oscillator Frequency" with conditions noting full-temperature-range applicability (denoted by "l" symbol).
How does the LT8642EV-1#PBF handle overload or short-circuit conditions?
The LT8642EV-1#PBF employs cycle-by-cycle current limiting on both top and bottom MOSFETs: top switch limit is 14.5A–21.5A (typical 18A), bottom switch limit is 10A–16A (typical 13A). During overload, it enters hiccup mode - shutting down after repeated current-limit cycles, then restarting after thermal recovery. PG pin pulls low during fault, and frequency foldback reduces fSW to limit inductor current during sustained overloads.
LT8642EV-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 20-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):
- 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#PBF FAQ
1.How can I place an order for LT8642EV-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8642EV-1#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 LT8642EV-1#PBF reliable?
The price and inventory of LT8642EV-1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LT8642EV-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8642EV-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8642EV-1#PBF?
LT8642EV-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8642EV-1#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 LT8642EV-1#PBF?
For technical support, including LT8642EV-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8642EV-1#PBF requirements.
6.How does Aetrix verify that LT8642EV-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT8642EV-1#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 LT8642EV-1#PBF meets industry standards.
7.What is the process for return or replacement of LT8642EV-1#PBF?
All LT8642EV-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8642EV-1#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 LT8642EV-1#PBF part is unused and in its original packaging.
Return procedure for LT8642EV-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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