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Home > Products > Development Boards, Kits, Programmers > Evaluation Boards > DC/DC & AC/DC (Off-Line) SMPS Evaluation Boards

Vishay Siliconix SIC402DB

Name: SIC402DB
Brand: Vishay Siliconix
SKU: SIC402DB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SIC402DB

Manufacturer:: Vishay Siliconix

Category:: DC/DC & AC/DC (Off-Line) SMPS Evaluation Boards

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Datasheet:: SIC402DB.pdf

Description:: EVAL BOARD FOR SIC402

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Inventory:2,992

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Product details

Overview

SIC402DB from Vishay is a highly integrated synchronous buck regulator in the microBUCK® family, designed as a point-of-load DC-DC converter with integrated power MOSFETs. It operates from 3 V to 28 V input, delivers up to 10 A output current, supports 0.6 V to 13.2 V adjustable output voltage, and achieves >95% peak efficiency at 12 V_IN/3.3 V_OUT. It is used in notebook computers and networking equipment for stable, compact power delivery.

For engineers reviewing the SIC402DB datasheet, SIC402DB pinout, SIC402DB application, or SIC402DB equivalent, key selection criteria include its 10 A continuous output capability, programmable soft-start/soft-shutdown, pseudo-fixed frequency adaptive on-time control, integrated bootstrap diode, and over-voltage/over-current/thermal protection features.

Technical Context

The SIC402DB implements a valley-current-limited adaptive on-time control architecture with zero-cross detection and internal 1% reference voltage, enabling fast transient response and stable operation across wide VIN/VOUT ranges. Its integrated high- and low-side MOSFETs eliminate external gate drive complexity while supporting ceramic output capacitors without ESR requirements.

It features a dedicated PGOOD signal, under-voltage lockout (UVLO), and configurable EN/PSV pin for power-save mode entry. The functional block includes an internal LDO with bypass logic, soft-start timing control via external capacitor, and valley-limit current sensing for cycle-by-cycle over-current protection.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3 V to 28 V - supports wide-range industrial and computing rails including 5 V, 12 V, and 24 V systems.
Output Voltage Range	0.6 V to 13.2 V - adjustable via external resistor divider; enables core, I/O, and peripheral rail generation.
Max Output Current	10 A continuous - sufficient for CPU/GPU core supplies and high-performance SoC point-of-load applications.
Peak Efficiency	95 % at 12 V_IN/3.3 V_OUT - reduces thermal load and improves system-level power density.
Switching Frequency	500 kHz fixed - enables predictable EMI filtering and compact magnetics design.
Protection Features	OVP, UVP, OCP, SCP, OTP - comprehensive fault coverage eliminates need for external supervision circuits.
Soft-Start Control	Programmable via external capacitor - prevents inrush current and ensures controlled power-up sequencing.

Pinout & Package

The SIC402DB is housed in a thermally enhanced MLPQ55-32L package (5 mm × 5 mm × 0.9 mm) with exposed thermal pad for efficient heat dissipation in high-current applications.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Primary input supply	Accepts 3–28 V; connects to bulk input capacitor and feeds internal LDO and gate drivers.
LX	Switch node	Connects to external inductor; high-frequency switching node requiring low-inductance layout.
PGND	Power ground	High-current return path for internal MOSFETs; must be tied directly to thermal pad and input/output caps.
FB	Feedback input	Monitors output voltage via resistor divider; sets regulated VOUT with 1% internal reference.
EN/PSV	Enable / Power-save control	Active-high enable; tri-state capable for sequencing; pulls into power-save mode when low.
PGOOD	Power-good status	Open-drain output indicating valid regulation (±10% window); used for system power sequencing.
SS	Soft-start timing	Connects external capacitor to set ramp time; controls output voltage rise rate during startup.
BST	Bootstrap supply	Provides gate drive voltage for high-side MOSFET; requires 0.1 µF ceramic capacitor to LX.
ILIM	Current limit setting	Configures valley-current limit threshold via resistor to AGND; determines OCP trip point.
AGND	Analog ground	Reference for FB, SS, ILIM, and internal analog circuitry; must be separated from PGND at single-point star ground.

Key Features

Feature	Design Value
Integrated high- and low-side MOSFETs	Eliminates external FETs and gate drivers; reduces BOM count and PCB area by >30% vs discrete solutions.
Pseudo-fixed frequency adaptive on-time control	Maintains ~500 kHz operation across line/load transients while enabling <1 µs response to load steps.
Output ceramic capacitor support (no ESR requirement)	Enables use of low-profile, high-reliability X5R/X7R MLCCs instead of electrolytics; improves long-term stability.
Programmable soft-start and soft-shutdown	Prevents input inrush and output overshoot; supports hot-swap and graceful system shutdown sequences.
Integrated bootstrap diode	Removes need for external bootstrap diode; simplifies layout and improves reliability in high-duty-cycle operation.

Applications

Desktop and Server Computers	Notebook Computers
Use Scenario: Primary 12 V-to-3.3 V or 12 V-to-1.2 V conversion for chipset or memory I/O rails. IC Role / Device Role / Timing Role: Synchronous buck regulator providing tightly regulated, low-noise intermediate bus conversion. Use Value: Delivers 10 A continuous current with 95% efficiency, reducing board-level thermal stress and enabling fanless designs.	Use Scenario: Core voltage regulation for mobile CPUs or GPU subsystems in space-constrained laptops. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter with fast transient response for dynamic processor load changes. Use Value: Adaptive on-time control ensures <50 µs recovery from 0.2 A → 6 A load steps, maintaining VOUT within ±1%.
Networking Equipment	Consumer Digital HDTV
Use Scenario: Powering FPGA, ASIC, or PHY interfaces in switches/routers requiring stable 1.8 V or 2.5 V rails. IC Role / Device Role / Timing Role: Highly integrated buck regulator managing multiple independent output voltages via feedback configuration. Use Value: Integrated OVP/OCP/OTP protection avoids external fault monitoring ICs, improving system safety and BOM simplicity.	Use Scenario: Main SoC power supply in digital HDTV platforms operating from 12 V adapter input. IC Role / Device Role / Timing Role: Compact, scalable buck regulator delivering 5 V or 3.3 V to video processing subsystems. Use Value: MLPQ55-32L package (5 × 5 mm) fits tight board real estate while sustaining 10 A with minimal thermal derating.

Desktop and Server Computers

Notebook Computers

Use Scenario: Primary 12 V-to-3.3 V or 12 V-to-1.2 V conversion for chipset or memory I/O rails.

IC Role / Device Role / Timing Role: Synchronous buck regulator providing tightly regulated, low-noise intermediate bus conversion.

Use Value: Delivers 10 A continuous current with 95% efficiency, reducing board-level thermal stress and enabling fanless designs.

Use Scenario: Core voltage regulation for mobile CPUs or GPU subsystems in space-constrained laptops.

IC Role / Device Role / Timing Role: Point-of-load DC-DC converter with fast transient response for dynamic processor load changes.

Use Value: Adaptive on-time control ensures <50 µs recovery from 0.2 A → 6 A load steps, maintaining VOUT within ±1%.

Networking Equipment

Consumer Digital HDTV

Use Scenario: Powering FPGA, ASIC, or PHY interfaces in switches/routers requiring stable 1.8 V or 2.5 V rails.

IC Role / Device Role / Timing Role: Highly integrated buck regulator managing multiple independent output voltages via feedback configuration.

Use Value: Integrated OVP/OCP/OTP protection avoids external fault monitoring ICs, improving system safety and BOM simplicity.

Use Scenario: Main SoC power supply in digital HDTV platforms operating from 12 V adapter input.

IC Role / Device Role / Timing Role: Compact, scalable buck regulator delivering 5 V or 3.3 V to video processing subsystems.

Use Value: MLPQ55-32L package (5 × 5 mm) fits tight board real estate while sustaining 10 A with minimal thermal derating.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SiC402AB	Same package and electrical specs; differs only in pin-compatible variant marking (A/B suffix denotes minor process/test revision).	No functional difference; suitable for identical applications and PCB layouts.	Select SiC402AB if legacy design documentation references that variant; both share full datasheet compliance.
SiP12108	Smaller MLP33-16L (3 × 3 mm) package; lower 6 A rating; 4.5–16 V input; fixed 500 kHz frequency.	Better suited for space-constrained, lower-current applications like STB or audio SoCs where 10 A headroom is unnecessary.	Choose SiP12108 only when board area is critical and output current ≤6 A; not a drop-in replacement for SIC402DB.

Compared with SiC402AB and SiP12108, the SIC402DB provides the highest current capability (10 A) in the microBUCK® 5×5 mm footprint, making it optimal for demanding computing and telecom loads where thermal performance and scalability are prioritized over minimal size.

Availability

SIC402DB is available at Aetrix Electronics and suitable for desktop/server computers, notebook computers, and networking equipment requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for SIC402DB 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

Vishay Intertechnology, Inc. is a global manufacturer of discrete semiconductors and passive components, founded in 1962 and headquartered in Malvern, PA.

The microBUCK® product line was developed to deliver compact, scalable, and highly integrated synchronous buck regulators for point-of-load power conversion in computing, consumer, and communications systems.

FAQ

What is the maximum recommended output current for the SIC402DB?

The SIC402DB is rated for 10 A continuous output current under typical thermal conditions (T_A = 25 °C, 2-layer PCB with 2 oz copper). Derating applies above 60 °C ambient or with reduced airflow; full 10 A operation requires proper thermal pad soldering and heatsinking per Vishay's layout guidelines. The SIC402DB maintains regulation and protection integrity across this range.

Does the SIC402DB require an external bootstrap diode?

No, the SIC402DB integrates a bootstrap diode internally, eliminating the need for an external component. This simplifies layout, improves reliability, and reduces bill-of-materials cost. The BST pin still requires a 0.1 µF ceramic capacitor connected to the LX node, as specified in the SIC402DB datasheet for proper high-side gate drive operation.

What protection features are built into the SIC402DB?

The SIC402DB includes output over-voltage protection (OVP), under-voltage lockout (UVLO), output over-current protection (OCP), short-circuit protection (SCP), and over-temperature protection (OTP). All functions operate autonomously without external components. The SIC402DB also provides a PGOOD signal to indicate valid regulation, enabling safe system power sequencing.

Can the SIC402DB be used with ceramic output capacitors only?

Yes, the SIC402DB supports ceramic output capacitors exclusively - no ESR requirement. Its control loop is optimized for low-ESR MLCCs, allowing stable operation with typical 10–100 µF X5R/X7R stacks. This eliminates electrolytic capacitors, improving lifetime, temperature stability, and board-level reliability in the SIC402DB application.

What is the purpose of the ILIM pin on the SIC402DB?

The ILIM pin on the SIC402DB sets the valley-current limit threshold for over-current protection. A resistor from ILIM to AGND configures the trip point - e.g., 100 kΩ yields ~12 A limit. This allows designers to tune OCP sensitivity based on inductor saturation current and system fault tolerance, ensuring robust operation without nuisance tripping in the SIC402DB design.

SIC402DB Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Siliconix

Series:: microBUCK®

Packaging:: Box

Product Status:: Obsolete

Main Purpose:: DC/DC, Step Down with LDO

Outputs and Type:: 2 Non-Isolated Outputs

Voltage - Output:: -

Current - Output:: -

Voltage - Input:: 10A, 200mA

Regulator Topology:: 3V ~ 28V

Frequency - Switching:: Buck

Contents:: -

Utilized IC / Part:: Board(s)

Power - Output:: SiC402

SIC402DB FAQ

1.How can I place an order for SIC402DB through Aetrix?

Please submit a Request for Quotation (RFQ) for SIC402DB 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 SIC402DB reliable?

The price and inventory of SIC402DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SIC402DB is usually 5 days.

3.What payment methods are accepted for SIC402DB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC402DB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SIC402DB?

SIC402DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SIC402DB 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 SIC402DB?

For technical support, including SIC402DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC402DB requirements.

6.How does Aetrix verify that SIC402DB is sourced from the original manufacturer or authorized distributors?

All SIC402DB 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 SIC402DB meets industry standards.

7.What is the process for return or replacement of SIC402DB?

All SIC402DB units undergo pre-shipment inspection (PSI). If there is an issue with SIC402DB, 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 SIC402DB part is unused and in its original packaging.

Return procedure for SIC402DB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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