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Vishay Siliconix SIC431DED-T1-GE3
- Part No.:
- SIC431DED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- 24-PowerWFQFN
- Datasheet:
-
SIC431DED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP44-24
- Quantity:
- Payment:
- Shipping:
Inventory:2,537
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Product details
Overview
SIC431DED-T1-GE3 from Vishay Siliconix is a 24 A synchronous buck DC/DC converter with integrated high-side (6 mΩ) and low-side (2 mΩ) MOSFETs, operating from 3 V to 24 V input and delivering adjustable output down to 0.6 V. It supports programmable switching frequencies up to 1 MHz and delivers 97% peak efficiency in power-constrained computing and industrial POL applications.
For engineers reviewing the SIC431DED-T1-GE3 datasheet, SIC431DED-T1-GE3 pinout, SIC431DED-T1-GE3 application, or SIC431DED-T1-GE3 equivalent, key selection criteria include its power-saving mode operation, ±1% output voltage accuracy over –40 °C to +125 °C, internal compensation eliminating external ESR networks, and robust protection suite including OVP, OCP, UVP, and OTP.
Technical Context
The SIC431DED-T1-GE3 implements a voltage-mode constant-on-time (VM-COT) control architecture with internally generated ramp signal and error amplifier loop, enabling ultrafast transient response and stable regulation without external compensation components. Its dual-path feedback-fast ripple injection and slow DC error correction-ensures tight output regulation under dynamic load steps.
This variant (SiC431D) operates in power-saving mode with no minimum switching frequency, enabling diode emulation and frequency foldback at light loads to achieve 50 μA non-switching quiescent current and 1 μA shutdown current. Input voltage range is 3 V to 24 V, requiring external VDD/VDRV supplies below 4.5 V per datasheet specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 24 A continuous - supports high-density point-of-load conversion for CPU/GPU core rails. |
| Input Voltage Range | 3 V to 24 V - compatible with 5 V, 12 V, and 24 V intermediate bus architectures. |
| Output Voltage Range | Adjustable down to 0.6 V - enables precise core voltage regulation for modern processors and FPGAs. |
| Feedback Accuracy | ±1 % from –40 °C to +125 °C - ensures stable output across full industrial temperature range without calibration. |
| Switching Frequency | Programmable: 300/500/750/1000 kHz - allows optimization of size vs. efficiency trade-offs via MODE1 resistor. |
| Light Load Mode | Power-save (SiC431D) - eliminates recirculating current and reduces switching losses; no minimum frequency limit. |
| Protection Features | OVP, UVP, cycle-by-cycle OCP, OTP, and PGOOD - enables autonomous fault recovery and system-level monitoring. |
Pinout & Package
The SIC431DED-T1-GE3 is housed in a lead-free PowerPAK® MLP44-24L package (4 mm × 4 mm), optimized for thermal performance and high-power density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2,22,26) | Input power supply | Accepts 3–24 V input; multiple pins reduce IR drop and improve current sharing. |
| PGND (3,4,13,27) | Power ground return | Low-inductance path for high-current switch node return; separate from AGND. |
| SW (5–9) | Switching node | Connects to external inductor; carries high dv/dt and high peak currents. |
| GL (10,11,28) | Low-side gate driver output | Drives integrated low-side MOSFET; requires minimal external gate resistance. |
| VDRV (12) | Gate driver supply | Must be decoupled with 2.2 μF capacitor to PGND; powers internal high-side driver. |
| PGOOD (14) | Open-drain power-good flag | Asserts when VFB is within ±40 mV of 0.6 V reference; 25 μs blanking prevents false triggers. |
| VDD (15) | Logic supply input | Requires 1 μF decoupling to AGND; UVLO threshold is 3.6 V (±300 mV hysteresis). |
| AGND (16,25) | Analog ground reference | Separate from PGND to minimize noise coupling into feedback and control circuitry. |
| FB (17) | Feedback input | Monitors output via resistor divider; internal 0.6 V reference enables precise VOUT setting. |
| VOUT (18) | Output voltage sense | Direct connection to output rail improves load regulation by compensating for PCB trace IR drop. |
| EN (19) | Enable control | Active-high logic; internal 5 MΩ pull-down prevents floating startup; VIH = 1.6 V min. |
| MODE2 (20) | Soft-start & current limit select | Resistor to VDD/AGND sets soft-start time (3 ms or 6 ms) and OCP threshold (9.6–32 A). |
| MODE1 (21) | Frequency & mode select | Resistor to VDD/AGND configures switching frequency (300–1000 kHz) and CCM/skip mode. |
| BOOT (23) | Bootstrap supply | Connects to PHASE via 0.1 μF capacitor; generates gate drive voltage for high-side MOSFET. |
| PHASE (24) | Bootstrap return path | AC-coupled node tied to SW; provides return path for bootstrap capacitor charging. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated VM-COT control | Eliminates need for external ESR network or compensation components - reduces BOM count and layout sensitivity. |
| Pre-bias start-up support | Prevents negative output voltage spikes and excessive current sinking when VOUT is pre-charged. |
| Output voltage tracking & sequencing | Enables coordinated power-up/down of multiple rails using FB and VOUT pins - critical for multi-rail SoCs. |
| Ultra-low quiescent current | 50 μA operating current (non-switching) and 1 μA shutdown current - extends battery life in always-on systems. |
| Thermal-enhanced MLP44-24L package | RθJA = 16 °C/W - enables 24 A operation without forced airflow in compact industrial enclosures. |
Applications
| Server Core Voltage Regulation | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Regulating 1.2 V core voltage for Xeon or AMD EPYC processors in 1U rack servers with strict thermal and space constraints. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering 24 A continuous current with fast transient response to handle CPU burst loads. Use Value: Achieves 97% peak efficiency and ±1% output accuracy across –40 °C to +125 °C, reducing heatsink size and improving system reliability. |
Use Scenario: Generating isolated 3.3 V or 5 V rails for digital I/O modules in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: High-reliability POL converter with OVP/UVP/OTP protection and pre-bias start-up for hot-swap capability. Use Value: Internal protection features eliminate need for external supervision ICs; MLP44-24L package withstands vibration and wide ambient temperature swings. |
| Networking Switch ASIC Power | Automated Test Equipment (ATE) Bias Supply |
Use Scenario: Supplying 0.85 V @ 20 A to high-speed Ethernet switch ASICs with rapid load transients during packet bursts. IC Role / Device Role / Timing Role: Fast-response VM-COT regulator minimizing output capacitance while maintaining < ±10 mV ripple under 10 A/μs load steps. Use Value: Ultrafast transient response and internal ramp generation enable stable regulation with only 4×100 μF output capacitors - saving board area. |
Use Scenario: Providing precision-adjustable bias voltage (0.6–5 V) to DUT power rails in automated test systems requiring low-noise, repeatable outputs. IC Role / Device Role / Timing Role: Programmable buck converter with ±1% VOUT accuracy and PGOOD flag for test sequence synchronization. Use Value: Resistor-programmable soft-start and current limit allow safe ramp-up of sensitive DUTs; PGOOD enables sequenced test execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 1.5 A max output, 2 MHz fixed frequency, no integrated MOSFETs - requires external high/low-side switches. | Suitable for sub-2 A loads only; lacks OVP/UVP and PGOOD; not pin-compatible. | Select only for low-current, cost-sensitive designs where external MOSFETs are acceptable and protection is handled externally. |
| TPS54560BQDDARQ1 | 5.5 A max output, 100 kHz–2.5 MHz adjustable frequency, external compensation required. | Lower current rating and higher external component count; automotive-grade but lacks pre-bias start-up. | Choose for automotive applications needing AEC-Q100 qualification, but not for 24 A computing or industrial POL use cases. |
Compared with MP2451DT-LF-Z and TPS54560BQDDARQ1, the SIC431DED-T1-GE3 delivers 4.4× higher current in the same footprint, integrates both power MOSFETs and full protection, and supports pre-bias start-up and output tracking - making it uniquely suited for high-density, high-reliability 24 A POL designs.
Availability
SIC431DED-T1-GE3 is available at Aetrix Electronics and suitable for server motherboard power delivery, industrial PLC power modules, and networking switch ASIC supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for SIC431DED-T1-GE3 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 Siliconix is a global leader in discrete semiconductors and passive components, specializing in high-efficiency power management solutions with emphasis on ruggedness, thermal performance, and integration.
The SiC43x family-including SIC431DED-T1-GE3-is designed for high-current, high-density point-of-load conversion in computing, telecom, and industrial systems where efficiency, reliability, and minimal external components are critical.
FAQ
What is the maximum continuous output current supported by the SIC431DED-T1-GE3?
The SIC431DED-T1-GE3 supports 24 A continuous output current at up to 1 MHz switching frequency, as validated under thermal conditions with proper PCB copper area and airflow. This rating assumes VIN = 12 V, VOUT = 1.2 V, and ambient temperature ≤ +105 °C per the Vishay datasheet S18-0866-Rev. D.
Does the SIC431DED-T1-GE3 require external compensation components?
No, the SIC431DED-T1-GE3 uses an internally compensated voltage-mode constant-on-time (VM-COT) architecture. No external RC network or ESR-based compensation is needed - all ramp generation and error amplifier compensation are integrated, simplifying design and improving stability across load and line variations.
How does the SIC431DED-T1-GE3 implement light-load efficiency optimization?
The SIC431DED-T1-GE3 (SiC431D variant) operates in power-saving mode, deploying diode emulation and frequency foldback as load decreases. It turns off the low-side MOSFET at zero inductor current and reduces switching frequency proportionally - achieving 50 μA non-switching quiescent current and eliminating recirculating losses without audible noise.
What protection features are integrated into the SIC431DED-T1-GE3?
The SIC431DED-T1-GE3 integrates output overvoltage protection (OVP), output undervoltage/short-circuit protection (UVP) with auto-retry, cycle-by-cycle overcurrent protection (OCP), overtemperature protection (OTP) with 35 °C hysteresis, and power-good (PGOOD) flag - all implemented without external components.
Can the SIC431DED-T1-GE3 support pre-bias start-up?
Yes, the SIC431DED-T1-GE3 supports pre-bias start-up. When the FB pin senses a voltage higher than the internal reference ramp, the control logic inhibits switching to prevent negative output voltage spikes and excessive current sinking through the low-side MOSFET - essential for hot-swap and multi-rail sequencing applications.
SIC431DED-T1-GE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Package/Case:
- 24-PowerWFQFN
- 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):
- 3V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 21.6V
- Current - Output:
- 24A
- Frequency - Switching:
- 300kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerPAK® MLP44-24
SIC431DED-T1-GE3 FAQ
1.How can I place an order for SIC431DED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC431DED-T1-GE3 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 SIC431DED-T1-GE3 reliable?
The price and inventory of SIC431DED-T1-GE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SIC431DED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC431DED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC431DED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC431DED-T1-GE3?
SIC431DED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC431DED-T1-GE3 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 SIC431DED-T1-GE3?
For technical support, including SIC431DED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC431DED-T1-GE3 requirements.
6.How does Aetrix verify that SIC431DED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC431DED-T1-GE3 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 SIC431DED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC431DED-T1-GE3?
All SIC431DED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC431DED-T1-GE3, 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 SIC431DED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC431DED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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