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Vishay Siliconix SIC431AED-T1-GE3
- Part No.:
- SIC431AED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- 24-PowerWFQFN
- Datasheet:
-
SIC431AED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP44-24
- Quantity:
- Payment:
- Shipping:
Inventory:16,020
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Product details
Overview
SIC431AED-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 ultrasonic light-load mode, 1 MHz switching, ±1% output voltage accuracy over –40 °C to +125 °C, and is used in point-of-load regulation for server VRMs and industrial computing power rails.
For engineers reviewing the SIC431AED-T1-GE3 datasheet, SIC431AED-T1-GE3 pinout, SIC431AED-T1-GE3 application, or SIC431AED-T1-GE3 equivalent, key selection criteria include its ultrasonic light-load operation (avoiding audible noise), internal gate driver supply (VDRV/VDD), programmable switching frequency (300–1000 kHz), and full protection suite including OVP, UVP, OTP, and cycle-by-cycle OCP.
Technical Context
The SIC431AED-T1-GE3 implements a voltage-mode constant-on-time (VM-COT) control architecture with internally generated ramp signal and error amplifier compensation - eliminating need for external ESR networks or loop compensation components. Its fast transient response is enabled by dual feedback paths: a high-gain slow path for DC regulation and a ripple-injection fast path for load-step correction.
This variant (SiC431A) operates in ultrasonic mode with minimum switching frequency <20 kHz to suppress audible noise, uses internal VDD/VDRV generation (no external bias required above 4.5 V VIN), and features MODE1/MODE2 resistor-programmable settings for frequency, soft-start time (3 ms or 6 ms), and current limit (9.6–32 A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 24 V - supports wide-input POL applications including 5 V, 12 V, and 24 V rails without external bias circuitry. |
| Output Current | 24 A continuous - enables single-chip solutions for high-current CPU/GPU core rails in servers and industrial controllers. |
| Switching Frequency | Programmable 300/500/750/1000 kHz - allows trade-off between efficiency, size, and EMI; 1 MHz enables compact inductor selection. |
| Feedback Accuracy | ±1% over –40 °C to +125 °C - ensures stable output regulation across automotive-grade temperature range without calibration. |
| Light-Load Mode | Ultrasonic (SiC431A) - reduces switching frequency below 20 kHz only during very light loads to eliminate audible coil whine. |
| Protection Features | OVP, UVP, OTP, cycle-by-cycle OCP, and pre-bias startup - provides robust fault handling without external supervision circuitry. |
| Efficiency Peak | 97% at 12 VIN/1.2 VOUT/500 kHz - minimizes thermal stress and improves system-level power density in space-constrained designs. |
Pinout & Package
The SIC431AED-T1-GE3 is housed in a lead-free PowerPAK® MLP44-24L package (4 mm × 4 mm, 0.5 mm pitch), optimized for high-current thermal performance and PCB area reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 2, 22, 26) | Input power supply connection | Four parallel pins reduce IR drop and improve current sharing for 24 A operation. |
| PGND (Pins 3, 4, 13, 27) | Power ground return | Dedicated low-impedance path for high di/dt switching currents; separate from AGND to minimize noise coupling. |
| SW (Pins 5–9) | Switching node | High-frequency node connecting integrated HS/LS MOSFETs to external inductor; requires tight layout for EMI control. |
| GL (Pins 10, 11, 28) | Low-side gate drive output | Drives LS MOSFET; multiple pins reduce gate loop inductance and improve switching speed. |
| VDRV (Pin 12) | Internal gate driver supply | Requires 2.2 μF decoupling to PGND; powers HS/LS drivers independently of VDD logic supply. |
| PGOOD (Pin 14) | Open-drain power-good flag | Signals valid output after soft-start and within ±10% window; blanked for 25 μs to avoid false triggers. |
| VDD (Pin 15) | Internal logic supply | 5 V nominal supply for control circuitry; internally regulated from VIN when VIN ≥ 4.5 V. |
| AGND (Pins 16, 25) | Analog ground reference | Reference for FB, MODE, EN, and PGOOD; must be connected to clean ground plane near IC. |
| FB (Pin 17) | Output voltage feedback | Monitors resistive divider output; 600 mV internal reference sets VOUT = 0.6 V × (1 + RUP/RDOWN). |
| VOUT (Pin 18) | Output voltage sense | Direct Kelvin connection to output rail for accurate remote sensing and improved load regulation. |
| EN (Pin 19) | Enable control input | Active-high logic; internal 5 MΩ pull-down prevents floating; threshold 1.6 V (min) for reliable turn-on. |
| MODE2 (Pin 20) | Soft-start & current limit select | Resistor-to-AGND or VDD sets soft-start time (3/6 ms) and OCP threshold (9.6–32 A). |
| MODE1 (Pin 21) | Frequency & operation mode select | Resistor-to-AGND or VDD selects switching frequency (300–1000 kHz) and forces CCM or ultrasonic mode. |
| BOOT (Pin 23) | Bootstrap capacitor connection | Connects to PHASE via 0.1 μF capacitor to generate HS gate voltage above VIN for n-channel MOSFET drive. |
| PHASE (Pin 24) | Bootstrap return path | Switching node for bootstrap capacitor return; must be routed with minimal inductance to BOOT pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power stage | 6 mΩ HS + 2 mΩ LS MOSFETs enable 97% peak efficiency and eliminate discrete FET layout complexity. |
| Ultrasonic light-load mode | Reduces switching frequency below 20 kHz only at very light loads - eliminates audible noise without sacrificing regulation. |
| Internal VM-COT compensation | No external RC network required; internal ramp generator and error amplifier ensure stability across all VOUT/fSW combinations. |
| Programmable protection thresholds | Resistor-selectable OCP (9.6–32 A) and soft-start (3/6 ms) allow tuning for specific inductor and load requirements. |
| Pre-bias start-up support | Monitors FB voltage before enabling switching - prevents negative current surge and output collapse when VOUT is pre-charged. |
| Power good with hysteresis | Open-drain PGOOD asserts when VFB is within 40 mV window of 0.6 V reference - enables safe sequencing with downstream logic. |
Applications
| Server Core Voltage Regulation | Industrial PLC I/O Power |
|---|---|
|
Use Scenario: Providing tightly regulated 1.2 V @ 24 A core supply to Xeon or AMD EPYC processors in 1U rack servers. IC Role / Device Role / Timing Role: Primary synchronous buck controller with integrated power stage, managing dynamic load transients up to 12 A/μs. Use Value: ±1% output accuracy and ultrafast transient response (<10 μs recovery) maintain CPU stability during burst workloads. |
Use Scenario: Generating isolated 3.3 V or 5 V auxiliary rails for digital I/O modules in factory automation PLCs. IC Role / Device Role / Timing Role: Point-of-load regulator converting 24 V industrial bus to low-voltage logic supplies with high reliability. Use Value: Full protection suite (OTP, OVP, UVP) ensures uninterrupted operation in harsh environments with wide ambient swings. |
| Telecom Baseband Processing | Embedded GPU Power Delivery |
|
Use Scenario: Delivering 0.85 V @ 18 A to FPGA-based baseband processors in 5G radio units with strict EMI limits. IC Role / Device Role / Timing Role: High-frequency (1 MHz) buck converter minimizing inductor size while maintaining <20 mV ripple. Use Value: Programmable 300–1000 kHz switching allows EMI band steering and compliance with EN 55022 Class B. |
Use Scenario: Supplying 1.0 V @ 20 A to embedded GPUs in edge AI inference accelerators with thermal constraints. IC Role / Device Role / Timing Role: Thermally optimized POL converter using MLP44-24L package for direct heatsink mounting. Use Value: 2 °C/W junction-to-case thermal resistance enables >20 A operation at 70 °C ambient without forced airflow. |
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, no integrated MOSFETs, requires external high-side switch; 2 MHz fixed frequency. | Targeted at low-power IoT sensors, not high-current POL; lacks OVP/UVP and ultrasonic mode. | Select only for sub-2 A applications where board space is critical and protection is handled externally. |
| TPS54821RHLR | 20 A max, external MOSFETs, 2.2 V to 18 V input, 0.6–5.5 V output; supports PMBus for telemetry. | Used in programmable power systems requiring real-time monitoring; higher BOM cost and layout complexity. | Choose when digital control, telemetry, or input voltage <3 V is required - not a drop-in replacement. |
Compared with MP2451DT-LF-Z and TPS54821RHLR, the SIC431AED-T1-GE3 delivers 24 A with fully integrated FETs, ultrasonic light-load operation, and wider 3–24 V input - making it uniquely suited for high-density, high-reliability POLs where simplicity, thermal performance, and acoustic noise matter.
Availability
SIC431AED-T1-GE3 is available at Aetrix Electronics and suitable for server VRMs, industrial PLCs, telecom baseband units, and embedded GPU power delivery requiring stable component supply and long-term production continuity.
Supply support for SIC431AED-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 power ICs, specializing in high-efficiency, high-reliability power conversion solutions for demanding industrial and computing applications.
The SiC43x family - including SIC431AED-T1-GE3 - was designed specifically for high-current, low-voltage point-of-load regulation in space-constrained, thermally aggressive environments such as data center servers and automated machinery.
FAQ
What is the maximum input voltage rating for the SIC431AED-T1-GE3?
The SIC431AED-T1-GE3 has an absolute maximum input voltage (VIN) rating of +25 V referenced to PGND. Its recommended operating input range is 3 V to 24 V, with internal VDD/VDRV generation active above 4.5 V VIN - ensuring robust operation across industrial and telecom power rails without external bias circuitry.
Does the SIC431AED-T1-GE3 require external compensation components?
No, the SIC431AED-T1-GE3 does not require external compensation components. Its voltage-mode constant-on-time (VM-COT) architecture integrates all ramp generation and error amplifier compensation circuitry internally, enabling stable operation across its full output voltage and switching frequency range without external RC networks.
How is light-load efficiency optimized in the SIC431AED-T1-GE3?
The SIC431AED-T1-GE3 uses ultrasonic mode (SiC431A variant) to optimize light-load efficiency: it reduces switching frequency below 20 kHz only at very light loads, eliminating audible coil noise while maintaining regulation. Diode emulation and frequency foldback further minimize switching and conduction losses without compromising output accuracy.
What protection features are integrated into the SIC431AED-T1-GE3?
The SIC431AED-T1-GE3 integrates output overvoltage protection (OVP), undervoltage/short-circuit protection (UVP), cycle-by-cycle overcurrent protection (OCP), overtemperature protection (OTP) with 35 °C hysteresis, power-good flag, and pre-bias start-up - all implemented without external components, ensuring robust system-level fault tolerance.
Can the SIC431AED-T1-GE3 be used with a 3.3 V input supply?
Yes, the SIC431AED-T1-GE3 supports 3 V to 24 V input, but when VIN is below 4.5 V, an external 4.5–5.5 V supply must be provided to VDD and VDRV pins (as specified for SiC431C/D variants). The SIC431AED-T1-GE3 (SiC431A) is optimized for VIN ≥ 4.5 V, where internal VDD/VDRV generation eliminates the need for external bias.
SIC431AED-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):
- 20V
- Current - Output:
- 24A
- Frequency - Switching:
- 300kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerPAK® MLP44-24
SIC431AED-T1-GE3 FAQ
1.How can I place an order for SIC431AED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC431AED-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 SIC431AED-T1-GE3 reliable?
The price and inventory of SIC431AED-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 SIC431AED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC431AED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC431AED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC431AED-T1-GE3?
SIC431AED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC431AED-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 SIC431AED-T1-GE3?
For technical support, including SIC431AED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC431AED-T1-GE3 requirements.
6.How does Aetrix verify that SIC431AED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC431AED-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 SIC431AED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC431AED-T1-GE3?
All SIC431AED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC431AED-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 SIC431AED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC431AED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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