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Analog Devices Inc. LT8642SIV#PBF
- Part No.:
- LT8642SIV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
LT8642SIV#PBF.pdf
- Description:
- IC REG BUCK ADJ 10A 24LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,095
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Product details
Overview
LT8642SIV#PBF from Analog Devices is a 18V, 10A synchronous step-down Silent Switcher 2 regulator featuring integrated bypass capacitors for ultralow EMI, 20ns minimum on-time for high step-down ratios at up to 3MHz, and external VC compensation for fast transient response in server, automotive, and industrial power supplies.
For engineers reviewing the LT8642SIV#PBF datasheet, LT8642SIV#PBF pinout, LT8642SIV#PBF application, or LT8642SIV#PBF equivalent, key selection considerations include EMI performance with/without spread spectrum, forced continuous vs. Burst Mode quiescent current (240µA), 0.597V feedback reference accuracy, and thermal management via exposed pad soldering in the 4mm × 4mm LQFN package.
Technical Context
The LT8642SIV#PBF implements peak current mode control with frequency programmable from 200kHz to 3MHz via RT resistor, enabling optimization of size-efficiency trade-offs. Its second-generation Silent Switcher architecture integrates internal VIN, BST, and INTVCC bypass capacitors to minimize high-di/dt loop area and eliminate layout sensitivity for CISPR32 Class B radiated emissions compliance.
It supports four operating modes via SYNC/MODE pin: Burst Mode (low IQ), forced continuous (fast transients), spread spectrum (±20% frequency modulation), and external synchronization. The VC pin enables full loop compensation tuning, while SS pin provides soft-start and tracking functionality with 1.9µA internal pull-up current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 18V - supports wide-input industrial and automotive rails without pre-regulation. |
| Output Current | 10A continuous - delivers high power density in compact 4mm × 4mm footprint. |
| Feedback Reference | 0.597V ±3mV - enables precise output regulation with low-resistor-divider error impact. |
| Min On-Time | 20ns - allows 12V-to-1.2V conversion at 2MHz without pulse-skipping instability. |
| Quiescent Current | 240µA at 12VIN→1.2VOUT - ensures ultra-low standby power in always-on systems. |
| EMI Performance | CISPR32 Class B compliant - achieves radiated emission limits without external EMI filter on demo board. |
| Switching Frequency | 200kHz–3MHz (RT-programmable) - balances inductor size, efficiency, and noise across load conditions. |
Pinout & Package
LT8642SIV#PBF is housed in a 24-lead 4mm × 4mm × 0.94mm LQFN package with exposed thermal pad (Pins 25–28 = GND). The package matches standard QFN footprints and requires soldering of the exposed pad for optimal thermal performance (θJC(PAD) = 7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | External bias supply input | Reduces VIN current draw when tied to ≥3.3V output; improves light-load efficiency. |
| INTVCC (2) | Internal 3.4V regulator bypass | Must be left floating; powers internal logic/drivers; sourced from BIAS or VIN. |
| GND (3,16,25–28) | Power and signal ground | Multiple dedicated pins + exposed pad ensure low-impedance return path for high di/dt currents. |
| VIN (4,5,6,13,14,15) | Main input power supply | Parallel connection required; local 4.7µF+ bypass essential for EMI and stability. |
| BST (7) | Bootstrap capacitor node | Drives top MOSFET gate; requires 0.22µF ceramic capacitor between BST and SW. |
| SW (8–12) | Switch node | High-current output to inductor; must be minimized in PCB area to reduce EMI radiation. |
| EN/UV (17) | Enable and input UVLO control | Hysteretic threshold (0.99V rise / 0.95V fall); enables programmable input undervoltage lockout. |
| RT (18) | Frequency programming | Resistor to GND sets switching frequency (e.g., 60.4kΩ = 2MHz); enables design flexibility. |
| CLKOUT (19) | Clock output | Provides synchronized ~200ns pulses at switch frequency for multi-rail timing coordination. |
| SYNC/MODE (20) | Operating mode select | Ground = Burst Mode; float = FCM; >3V = spread spectrum; clock input = sync mode. |
| SS (21) | Soft-start and tracking | 1.9µA internal pull-up enables capacitor-programmed ramp rate; supports output voltage tracking. |
| VC (22) | Error amplifier output | External RC network sets loop compensation; enables fast transient response and current sharing. |
| PG (23) | Power good indicator | Open-drain output asserts high when FB is within ±8% of 0.597V and no faults exist. |
| FB (24) | Feedback input | Regulated to 0.597V; connects to resistor divider tap; requires 4.7–47pF phase-lead capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 Architecture | Integrated VIN/BST/INTVCC bypass capacitors eliminate layout-dependent EMI, enabling Class B compliance on any PCB. |
| Ultralow Quiescent Current | 240µA IQ at no load ensures minimal battery drain in always-on automotive or IoT applications. |
| 20ns Minimum On-Time | Enables direct 12V-to-1.2V conversion at 2MHz without requiring intermediate regulation stages. |
| Spread Spectrum Modulation | ±20% frequency dithering reduces peak EMI amplitude by spreading energy across bandwidth. |
| External Compensation (VC) | Full control over loop dynamics allows optimization for specific inductors, capacitors, and load profiles. |
| Four-Mode Operation | Selectable Burst Mode (low IQ), FCM (fast transients), spread spectrum (low EMI), or sync (system timing coherence). |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers image sensor and SoC in forward-facing camera module with strict CISPR25 Class 5 EMI limits. IC Role / Device Role / Timing Role: Primary 12V-to-1.2V/10A DC/DC converter delivering clean, low-noise power with spread spectrum enabled. Use Value: Eliminates need for external EMI filters and shielding, reducing BOM cost and board area by >30% versus legacy solutions. |
Use Scenario: Supplies field-programmable gate array (FPGA) and analog front-end in modular industrial controller. IC Role / Device Role / Timing Role: High-current, thermally robust point-of-load regulator with forced continuous mode for fast load-step response. Use Value: Maintains <50mV dropout under 10A load steps while operating at 125°C junction temperature with exposed-pad thermal relief. |
| Server DDR5 Memory Regulator | Medical Imaging FPGA Core Supply |
|
Use Scenario: Provides tightly regulated 1.1V core voltage to DDR5 memory subsystem in data center servers. IC Role / Device Role / Timing Role: Synchronous buck converter with VC compensation tuned for low-ESR ceramic output capacitors and rapid load transients. Use Value: Achieves <10mVP-P output ripple and ±0.5% line/load regulation across –40°C to +125°C ambient range. |
Use Scenario: Delivers stable 1.2V/10A power to real-time image reconstruction FPGA in portable ultrasound equipment. IC Role / Device Role / Timing Role: Low-noise, low-EMI power stage synchronized to system clock via CLKOUT and SYNC/MODE pins. Use Value: Prevents RF interference with sensitive analog receive chains while meeting IEC 60601-1 EMC requirements. |
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 |
|---|---|---|---|
| LT8645SIV#PBF | Same architecture, higher 15A rating, larger 5mm × 6mm LQFN package, 22mΩ top FET RDS(ON). | Required for >10A loads or higher thermal margin; not pin-compatible due to different pin count and layout. | Select when output current exceeds 10A or board space allows larger package for improved thermal headroom. |
| MPQ4572GQB-AEC1-Z | Automotive-grade 12A buck, 3.8–60V input, no integrated bypass caps, 40ns min on-time, lower EMI performance. | Targets wider-input automotive systems but lacks Silent Switcher EMI suppression; requires careful layout for CISPR25. | Choose only if input voltage exceeds 18V or AEC-Q200 qualification is mandatory; expect higher EMI filter cost. |
Compared with LT8645SIV#PBF and MPQ4572GQB-AEC1-Z, the LT8642SIV#PBF uniquely balances 10A capability, ultralow EMI via integrated capacitors, and compact 4mm × 4mm footprint-making it optimal for space-constrained, noise-sensitive applications where 18V max input suffices.
Availability
LT8642SIV#PBF is available at Aetrix Electronics and suitable for server power supplies, automotive ADAS modules, and industrial PLCs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for LT8642SIV#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.
The LT8642SIV#PBF belongs to the Silent Switcher 2 family, engineered specifically for high-efficiency, ultralow-EMI power conversion in noise-critical environments such as automotive radar, medical imaging, and high-speed data infrastructure.
FAQ
What is the maximum recommended junction temperature for continuous operation of the LT8642SIV#PBF?
The LT8642SIV#PBF is rated for continuous operation up to 125°C junction temperature. Its thermal design relies on proper soldering of the exposed pad (Pins 25–28) to a thermal plane, achieving θJC(PAD) = 7°C/W. Exceeding 125°C triggers overtemperature protection, which may cause intermittent shutdown; sustained operation above this limit reduces device lifetime. Derating is advised above 100°C ambient with full 10A load.
How does the LT8642SIV#PBF achieve ultralow EMI without external filtering components?
The LT8642SIV#PBF integrates ceramic bypass capacitors for VIN, BST, and INTVCC directly into the LQFN package, minimizing high-di/dt loop areas that generate magnetic-field EMI. This Silent Switcher 2 architecture, combined with symmetrical internal layout and fast, clean switching edges, enables CISPR32 Class B compliance on standard PCBs-even without external EMI filters-as verified on the DC2560A demo board.
Can the LT8642SIV#PBF operate with an input voltage below 2.8V?
No-the absolute minimum input voltage for regulation is 2.8V (typical), with 2.5V specified as minimum under all conditions per datasheet Electrical Characteristics. Below 2.5V, the internal regulators cannot sustain bias, causing UVLO activation and shutdown. For sub-2.8V inputs, consider the LT8641 (2.8V–42V) or LT8609 (2.8V–42V, lower current) families instead of the LT8642SIV#PBF.
What is the purpose of the BIAS pin on the LT8642SIV#PBF, and how should it be connected?
The BIAS pin on the LT8642SIV#PBF supplies current to internal circuitry when biased ≥3.1V, reducing VIN current draw and improving light-load efficiency. For outputs ≥3.3V, tie BIAS directly to VOUT. For lower outputs or external supplies, use a 1µF local bypass capacitor. If unused, connect to GND-but avoid this in high-frequency or high-input-voltage designs where efficiency loss is critical.
Does the LT8642SIV#PBF support output voltage tracking during power-up sequences?
Yes-the SS pin on the LT8642SIV#PBF enables output voltage tracking by accepting an external ramp voltage. When SS voltage is below 1V, the FB pin regulates to a proportional fraction of the SS voltage, allowing coordinated startup with other rails. An internal 1.9µA pull-up current permits simple RC-based soft-start; no external driver is needed unless precise sequencing with low-impedance sources is required.
LT8642SIV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 24-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):
- 2.8V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.597V
- Voltage - Output (Max):
- 3.3V
- 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:
- 24-LQFN (4x4)
LT8642SIV#PBF FAQ
1.How can I place an order for LT8642SIV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8642SIV#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 LT8642SIV#PBF reliable?
The price and inventory of LT8642SIV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8642SIV#PBF is usually 5 days.
3.What payment methods are accepted for LT8642SIV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8642SIV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8642SIV#PBF?
LT8642SIV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8642SIV#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 LT8642SIV#PBF?
For technical support, including LT8642SIV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8642SIV#PBF requirements.
6.How does Aetrix verify that LT8642SIV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8642SIV#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 LT8642SIV#PBF meets industry standards.
7.What is the process for return or replacement of LT8642SIV#PBF?
All LT8642SIV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8642SIV#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 LT8642SIV#PBF part is unused and in its original packaging.
Return procedure for LT8642SIV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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