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Vishay Siliconix SIC431BED-T1-GE3
- Part No.:
- SIC431BED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- 24-PowerWFQFN
- Datasheet:
-
SIC431BED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP44-24
- Quantity:
- Payment:
- Shipping:
Inventory:10,733
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Product details
Overview
SIC431BED-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 4.5 V to 24 V input and delivering adjustable output down to 0.6 V. It supports 300–1000 kHz programmable switching frequency, power-save light-load mode, and delivers 97% peak efficiency in POL applications for server VRMs and industrial computing.
For engineers reviewing the SIC431BED-T1-GE3 datasheet, SIC431BED-T1-GE3 pinout, SIC431BED-T1-GE3 application, or SIC431BED-T1-GE3 equivalent, key selection criteria include its internal compensation, ±1% output voltage accuracy over –40 °C to +125 °C, 50 μA non-switching quiescent current, and support for pre-bias startup and output voltage tracking in multi-rail systems.
Technical Context
The SIC431BED-T1-GE3 implements voltage-mode constant-on-time (VM-COT) control with internally generated ramp and error amplifier compensation - eliminating need for external ESR networks or loop compensation components. Its architecture enables ultrafast transient response with minimal output capacitance and tight ripple regulation at light load.
This variant (SiC431B) operates in power-save mode with no minimum switching frequency, enabling diode emulation and frequency foldback below 1 A load. It requires only a single input supply (VIN ≥ 4.5 V), integrates VDD/VDRV internally, and features dedicated MODE1/MODE2 pins for resistor-programmable frequency, soft-start time, and overcurrent limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 24 V - supports standard 5 V, 12 V, and 24 V intermediate bus rails without external bias supplies. |
| Output Current | 24 A continuous - sufficient for CPU/GPU core rails in servers and high-end embedded controllers. |
| Feedback Voltage | 600 mV ±3 mV (–40 °C to +125 °C) - enables ±1% output accuracy across full junction temperature range. |
| Switching Frequency | 300 / 500 / 750 / 1000 kHz - selectable via MODE1 resistor; higher frequencies allow smaller magnetics and faster transient response. |
| Light-Load Mode | Power-save (SiC431B) - disables LS recirculation and reduces switching frequency proportionally to load, improving efficiency below 1 A. |
| Protection Features | OVP (0.72 V FB threshold), UVP (0.54 V FB threshold), cycle-by-cycle OCP, OTP (150 °C trip), and PGOOD open-drain flag - ensures robust system-level fault handling. |
| Quiescent Current | 50 μA (non-switching), 0.5–3 μA shutdown - minimizes standby power in always-on subsystems. |
Pinout & Package
The SIC431BED-T1-GE3 is housed in a lead-free PowerPAK® MLP44-24L package (4 mm × 4 mm, 0.5 mm pitch), optimized for thermal performance and high-current PCB routing with multiple VIN, PGND, and AGND pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2,22,26) | Input power supply | Accepts 4.5–24 V; multiple pins reduce IR drop and improve thermal dissipation. |
| PGND (Pins 3,4,13,27) | Power ground return | Low-impedance path for high-current switch node return; must be connected to power plane under IC. |
| SW (Pins 5–9) | Switching node | Connects to inductor; high dv/dt node requiring tight layout and minimized loop area. |
| GL (Pins 10,11,28) | Low-side gate driver output | Drives internal LS MOSFET; not accessible externally - internal only. |
| VDRV (Pin 12) | Gate driver supply | Internally generated 5 V rail; requires 2.2 μF decoupling to PGND for stable HS gate drive. |
| PGOOD (Pin 14) | Power-good status flag | Open-drain output asserting when VFB is within 40 mV window of 0.6 V; requires external pull-up. |
| VDD (Pin 15) | Internal logic supply | Internally regulated 5 V rail; requires 1 μF decoupling to AGND for noise immunity. |
| AGND (Pins 16,25) | Analog reference ground | Separate from PGND; connects to feedback divider and VDD decoupling - critical for voltage accuracy. |
| FB (Pin 17) | Feedback input | Monitors output via resistor divider; sets VOUT = 0.6 V × (1 + RUP/RDOWN). |
| VOUT (Pin 18) | Output voltage sense | Direct connection to output capacitor; improves load regulation by sensing at point-of-load. |
| EN (Pin 19) | Enable control | Active-high logic input; internal 5 MΩ pull-down prevents floating enable during boot. |
| MODE2 (Pin 20) | Soft-start & OCP select | Resistor-to-VDD/AGND sets soft-start time (3/6 ms) and current limit (9.6–32 A). |
| MODE1 (Pin 21) | Frequency & mode select | Resistor-to-VDD/AGND selects switching frequency (300–1000 kHz) or forces CCM. |
| BOOT (Pin 23) | Bootstrap supply | Connects to PHASE via 0.1 μF capacitor; generates HS gate voltage above VIN. |
| PHASE (Pin 24) | Bootstrap return path | AC-coupled node tied to SW; completes bootstrap capacitor charging path. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated VM-COT control | Eliminates need for external compensation network or high-ESR bulk capacitors - reduces BOM count and design iteration time. |
| Programmable light-load operation | Power-save mode (SiC431B) enables diode emulation and adaptive frequency scaling - achieves >85% efficiency at 10 mA load. |
| Pre-bias startup support | Detects pre-charged output via FB pin and inhibits switching until safe - prevents reverse current and output collapse in multi-phase or hot-swap systems. |
| Output voltage tracking & sequencing | Uses EN and PGOOD signals with external timing circuits to coordinate power-up/down order across multiple rails - essential for FPGA and ASIC sequencing. |
| Robust protection suite | Includes OVP/UVP with auto-retry, cycle-by-cycle OCP, and OTP with 35 °C hysteresis - enables reliable operation in unattended industrial environments. |
Applications
| Server Core VRM | Industrial PLC I/O Module |
|---|---|
Use Scenario: Provides 1.2 V @ 24 A to CPU cores in 1U rack-mounted servers with strict thermal and transient response requirements. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated power stage; delivers fast load-step response (<10 μs) and tight output regulation under dynamic workloads. Use Value: Achieves 97% peak efficiency and <±1% output accuracy across –40 °C to +125 °C, reducing cooling overhead and improving system reliability. |
Use Scenario: Powers isolated analog I/O circuitry (ADCs, DACs, signal conditioners) in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Point-of-load regulator converting 24 V industrial bus to precise 3.3 V or 5 V rails with low noise and high PSRR. Use Value: Internal compensation and ±1% VFB accuracy ensure stable output despite wide ambient temperature swings and long cable runs. |
| Network Switch ASIC Supply | Medical Imaging Sensor Interface |
Use Scenario: Supplies 0.85 V @ 18 A to high-speed Ethernet switch ASICs requiring sub-100 mV ripple and rapid transient recovery. IC Role / Device Role / Timing Role: High-frequency (1 MHz) buck controller with VM-COT architecture - delivers <50 mV undershoot on 12 A load step. Use Value: Programmable frequency and internal ramp generation maintain low jitter and consistent response across varying input/output conditions. |
Use Scenario: Powers low-noise analog front-end sensors (e.g., CT/PET detector arrays) where EMI and output ripple directly impact image SNR. IC Role / Device Role / Timing Role: Low-ripple POL converter with VOUT sense pin and PGOOD monitoring - enables clean, sequenced power delivery to sensitive analog blocks. Use Value: 50 μA quiescent current and power-save mode extend battery life in portable diagnostic equipment without sacrificing startup integrity. |
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 internal MOSFETs - requires external high/low-side FETs. | Suitable for low-power microcontroller rails (<2 A); lacks integrated power stage and advanced protections like OVP/UVP. | Select when cost-sensitive, low-current, and board space allows discrete FETs and external compensation. |
| TPS54560QDGQRQ1 | 5.5 A max output, 100 kHz–2.5 MHz adjustable frequency, external compensation, automotive-grade (-40 °C to +125 °C). | Designed for automotive infotainment and ADAS; includes spread-spectrum and enhanced EMI control - not optimized for >20 A density. | Select when AEC-Q100 qualification, wider input range (3.5–60 V), or EMI-sensitive automotive deployment is required. |
Compared with MP2451DT-LF-Z and TPS54560QDGQRQ1, the SIC431BED-T1-GE3 delivers 4.3× higher current density in the same footprint, eliminates external MOSFET layout complexity, and provides tighter output accuracy and more comprehensive fault coverage - making it optimal for high-performance computing and industrial POL designs.
Availability
SIC431BED-T1-GE3 is available at Aetrix Electronics and suitable for server VRMs, industrial PLCs, network switch ASICs, and medical imaging sensor interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SIC431BED-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 ICs and ruggedized MOSFET technologies for demanding industrial and computing applications.
The SiC431 family targets high-current, high-density point-of-load conversion in datacenter, telecom, and automation systems - designed to replace multi-component discrete solutions with fully integrated, thermally optimized regulators.
FAQ
What is the maximum input voltage rating for the SIC431BED-T1-GE3?
The SIC431BED-T1-GE3 has an absolute maximum input voltage of +25 V referenced to PGND. Its recommended operating input range is 4.5 V to 24 V - supporting standard 5 V, 12 V, and 24 V intermediate bus rails without external bias supplies. Operation below 4.5 V requires external VDD/VDRV, which does not apply to this SiC431B variant.
Does the SIC431BED-T1-GE3 require external compensation components?
No, the SIC431BED-T1-GE3 uses internally compensated voltage-mode constant-on-time (VM-COT) control. All ramp generation and error amplifier compensation components are integrated, eliminating the need for external RC networks, type-II/type-III compensators, or high-ESR bulk capacitors - simplifying layout and reducing BOM count.
How is the switching frequency configured on the SIC431BED-T1-GE3?
The SIC431BED-T1-GE3 switching frequency (300 kHz, 500 kHz, 750 kHz, or 1 MHz) is set by connecting a resistor between MODE1 pin and either VDD or AGND, per Table 1 in the datasheet. For example, a 100 kΩ resistor to AGND configures 500 kHz operation - enabling optimization of efficiency, size, and EMI performance per application needs.
What protection features are integrated into the SIC431BED-T1-GE3?
The SIC431BED-T1-GE3 integrates output overvoltage protection (OVP at 0.72 V FB), undervoltage protection (UVP at 0.54 V FB), cycle-by-cycle overcurrent protection, overtemperature protection (150 °C trip with 35 °C hysteresis), and a dedicated open-drain PGOOD flag. All protections feature auto-retry or hysteresis to ensure robust recovery after fault clearance.
Can the SIC431BED-T1-GE3 support pre-bias startup?
Yes, the SIC431BED-T1-GE3 supports pre-bias startup. Its control logic monitors the FB pin during enable; if the sensed voltage exceeds the internal reference ramp value, both high-side and low-side MOSFETs remain off to prevent negative output spikes and excessive current sinking through the low-side FET - ensuring safe start-up into an already charged output rail.
SIC431BED-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
SIC431BED-T1-GE3 FAQ
1.How can I place an order for SIC431BED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC431BED-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 SIC431BED-T1-GE3 reliable?
The price and inventory of SIC431BED-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 SIC431BED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC431BED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC431BED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC431BED-T1-GE3?
SIC431BED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC431BED-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 SIC431BED-T1-GE3?
For technical support, including SIC431BED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC431BED-T1-GE3 requirements.
6.How does Aetrix verify that SIC431BED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC431BED-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 SIC431BED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC431BED-T1-GE3?
All SIC431BED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC431BED-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 SIC431BED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC431BED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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