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Vishay Siliconix SIC450ED-T1-GE3
- Part No.:
- SIC450ED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- 34-PowerWFQFN
- Datasheet:
-
SIC450ED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP34-57
- Quantity:
- Payment:
- Shipping:
Inventory:9,999
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Product details
Overview
SIC450ED-T1-GE3 from Vishay Siliconix is a PMBus 1.3–compliant, integrated synchronous buck DC/DC converter delivering up to 40 A continuous output current. It operates from a 4.5 V to 20 V input, supports digitally adjustable output voltage from 0.3 V to 12 V, and features ultrafast transient response for server point-of-load applications.
For engineers reviewing the SIC450ED-T1-GE3 datasheet, SIC450ED-T1-GE3 pinout, SIC450ED-T1-GE3 application, or SIC450ED-T1-GE3 equivalent, key selection criteria include its 40 A rated current, 600 kHz typical switching frequency, internal compensation, differential remote sensing, and full PMBus telemetry (VOUT, IOUT, PVIN, temperature).
Technical Context
The SIC450ED-T1-GE3 implements voltage-mode constant-on-time (VM-COT) control with internal ramp generation and dual-path feedback-fast ripple injection for transient suppression and slow error amplifier loop for precise DC regulation. Its architecture eliminates need for external ESR networks and ensures stability with any output capacitor type.
It integrates a 4 mΩ high-side and 1.4 mΩ low-side MOSFET pair, supports pre-bias start-up, diode emulation mode, and frequency foldback for light-load efficiency. Fault management-including pulse-by-pulse OCP, programmable OVP/UVP, OTP with hysteresis, and VIN-OVP/UVP-is fully configurable via PMBus commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 20 V - Supports wide industrial and server rail inputs including 12 V and 5 V intermediate buses. |
| Max Output Current | 40 A continuous - Enables single-chip solution for high-current DDR memory or ASIC core rails. |
| Output Voltage Range | 0.3 V to 12 V - Covers CPU cores, GPUs, FPGAs, and memory interfaces with 2 mV digital resolution. |
| Switching Frequency | 300 kHz to 1.5 MHz - Adjustable via RT resistor or PMBus; 600 kHz typical enables compact magnetics and low EMI. |
| Output Accuracy | ±1 % over temperature - Ensures tight regulation across -40 °C to +125 °C junction range. |
| PMBus Compliance | PMBus 1.3 at 1 MHz - Enables real-time telemetry, fault logging, and dynamic configuration in managed power systems. |
| Package | PowerPAK MLP34-57 (5 mm × 7 mm) - High thermal performance with 4.5 °C/W junction-to-case resistance. |
Pinout & Package
Package: PowerPAK MLP34-57, 34-pin, exposed thermal pad, lead (Pb)-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (1,2,3,34) | Power input supply | High-current input path for MOSFET bridge; connects directly to bulk capacitor and must be low-inductance. |
| PH (4) | Phase node | Switch node connection between high-side and low-side MOSFETs; critical for layout EMI control. |
| BOOT (6) | Bootstrap supply | Provides gate drive voltage for high-side MOSFET; requires 0.1 µF ceramic capacitor to PH. |
| AGND (7,16) | Analog ground reference | Return for precision analog circuits (VSEN+, VSEN-, VSET); must be separated from PGND. |
| VSEN+ / VSEN− (12,11) | Differential output sense | Enables remote sensing for ±1 % accuracy under load; rejects PCB IR drop up to ±200 mV common-mode. |
| PGOOD (13) | Open-drain status signal | Indicates VOUT within ±5 % of setpoint; requires external 10 kΩ pull-up to VDD for sequencing. |
| RT/SYNC (17) | Frequency/synchronization | Configures switching frequency (300–1500 kHz) or enables master/slave interleaving with 180° phase shift. |
| SDA / SCL (19,20) | PMBus interface | Supports hot-plug, read/write telemetry, and firmware updates without interrupting operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power stage | 4 mΩ HS + 1.4 mΩ LS MOSFETs - Delivers >96 % peak efficiency at 12 VIN/1.8 VOUT, 20 A, eliminating external driver complexity. |
| Internal compensation | No external RCOMP/CCOMP required - Stable with ceramic, polymer, or electrolytic output capacitors; reduces BOM count and layout risk. |
| Pre-bias start-up | Safe startup into pre-charged output - Prevents reverse current flow through low-side FET when VOUT > VSET at power-on. |
| Light-load efficiency mode | Diode emulation + frequency foldback - Maintains >85 % efficiency at 1 % load; ultrasonic mode avoids audible noise (<20 kHz). |
| Programmable fault protection | Independent thresholds for OCP, OVP, UVP, OTP, VIN-OVP/UVP - Enables system-specific safety margins without hardware changes. |
Applications
| Server Core Rail | DDR5 Memory Supply |
|---|---|
Use Scenario: Regulating 1.1 V core voltage for dual-socket Xeon Scalable processors under dynamic 0–40 A load transients. IC Role / Device Role / Timing Role: Primary point-of-load regulator with PMBus telemetry for dynamic voltage scaling and health monitoring. Use Value: Ultrafast VM-COT response minimizes required output capacitance by >40 % versus traditional voltage-mode controllers. |
Use Scenario: Delivering tightly regulated 1.1 V or 1.25 V to DDR5 modules with <±10 mV ripple and fast load-step recovery. IC Role / Device Role / Timing Role: Digitally programmable buck converter with differential remote sensing for board-level voltage accuracy. Use Value: ±1 % output accuracy and 2 mV VOUT resolution enable compliance with DDR5 VDDQ tolerance specifications. |
| AI Accelerator Board | Telecom Baseband Unit |
Use Scenario: Powering 0.75 V GPU core on PCIe-based AI inference cards with burst currents exceeding 35 A. IC Role / Device Role / Timing Role: High-current, thermally robust DC/DC with integrated MOSFETs and thermal shutdown hysteresis. Use Value: 4.5 °C/W junction-to-case thermal resistance and 125 °C OTP threshold ensure reliable operation under sustained 40 A loads. |
Use Scenario: Generating 3.3 V and 5 V rails for FPGA, SerDes, and RF front-end ICs in 5G baseband units. IC Role / Device Role / Timing Role: Configurable multi-rail power manager with synchronized switching to reduce input ripple and EMI. Use Value: RT/SYNC pin supports 180° interleaving with adjacent converters, cutting input capacitor RMS current by ~30 %. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current PMBus buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPM3695-50 from Monolithic Power Systems | 40 A rated, but uses proprietary I²C-like interface (not PMBus 1.3); no NVM storage; fixed 600 kHz fSW. | Lacks full PMBus command set (e.g., no VOUT margining, limited telemetry), limiting use in enterprise server management. | Choose for cost-sensitive telecom or industrial designs where PMBus telemetry is not required. |
| TPS546D24A from Texas Instruments | 40 A, PMBus 1.3 compliant, but larger 6 mm × 6 mm QFN package; higher RDS(on) (5.2 mΩ HS / 2.1 mΩ LS). | Higher conduction loss at full load; lower thermal density limits sustained 40 A operation in compact layouts. | Choose when TI's Fusion Digital Power Designer toolchain and extended fault logging are prioritized over footprint size. |
Compared with MPM3695-50 and TPS546D24A, the SIC450ED-T1-GE3 delivers superior thermal performance in a smaller 5 mm × 7 mm MLP package, full PMBus 1.3 interoperability, and non-volatile configuration storage-making it optimal for space-constrained, firmware-managed server and AI hardware.
Availability
SIC450ED-T1-GE3 is available at Aetrix Electronics and suitable for server, AI accelerator, DDR5 memory, and 5G baseband applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SIC450ED-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-density power conversion solutions for demanding computing and communications infrastructure.
The SiC45x family was designed specifically for high-current, digitally managed point-of-load regulation in cloud servers, AI hardware, and next-generation networking equipment-emphasizing PMBus configurability, thermal robustness, and minimal external component count.
FAQ
What is the maximum continuous output current rating for the SIC450ED-T1-GE3?
The SIC450ED-T1-GE3 is rated for 40 A continuous output current under recommended operating conditions (PVIN = 12 V, TA ≤ +85 °C, proper PCB thermal design). This rating applies across the full 0.3 V to 12 V output range and is validated per Vishay's S23-1166-Rev. D datasheet. Derating is required above +85 °C ambient or with insufficient copper area.
Does the SIC450ED-T1-GE3 require external compensation components?
No, the SIC450ED-T1-GE3 features fully integrated internal compensation. Its VM-COT architecture eliminates the need for external RCOMP/CCOMP networks, enabling stable operation with any output capacitor type-including low-ESR ceramics. This simplifies design, reduces BOM count, and improves reliability versus externally compensated buck controllers.
Can the SIC450ED-T1-GE3 operate with a pre-biased output voltage?
Yes, the SIC450ED-T1-GE3 supports pre-bias start-up. When VSEN+ and VSEN− detect an output voltage higher than the programmed VSET at power-on, the controller inhibits switching to prevent reverse current through the low-side MOSFET. This protects downstream circuitry and ensures safe, controlled ramp-up even when powering into an already charged rail.
What package type and thermal characteristics does the SIC450ED-T1-GE3 use?
The SIC450ED-T1-GE3 uses the PowerPAK MLP34-57 package (5 mm × 7 mm, 34-pin), with an exposed thermal pad. Its thermal resistance is specified as RthJ-C = 4.5 °C/W (junction-to-case) and RthJ-PCB = 5 °C/W (junction-to-PCB), enabling efficient heat transfer to the PCB. The package is lead (Pb)-free and RoHS-compliant.
How is output voltage set on the SIC450ED-T1-GE3-by resistor or PMBus?
The SIC450ED-T1-GE3 supports both methods: a resistor from VSET to AGND sets discrete output voltages (e.g., 0.6 V to 12 V per datasheet table), while PMBus commands enable fine-grained 2 mV resolution adjustment and independent programming of warning/fault thresholds. For full flexibility, PMBus is recommended; for fixed-voltage applications, VSET resistor is sufficient.
Is the SIC450ED-T1-GE3 pin-compatible with other SiC45x variants like SiC451ED-T1-GE3?
Yes, the SIC450ED-T1-GE3 shares identical pinout, package (MLP34-57), and footprint with SiC451ED-T1-GE3 and SiC453ED-T1-GE3. However, maximum current ratings differ (40 A vs. 25 A vs. 15 A), and internal current limit thresholds are factory-set per variant. Hardware replacement is mechanically possible, but firmware and protection settings must be verified for the target current level.
SIC450ED-T1-GE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- microBUCK®
- Package/Case:
- 34-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):
- 4.5V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.3V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 40A
- Frequency - Switching:
- 300kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerPAK® MLP34-57
SIC450ED-T1-GE3 FAQ
1.How can I place an order for SIC450ED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC450ED-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 SIC450ED-T1-GE3 reliable?
The price and inventory of SIC450ED-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 SIC450ED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC450ED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC450ED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC450ED-T1-GE3?
SIC450ED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC450ED-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 SIC450ED-T1-GE3?
For technical support, including SIC450ED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC450ED-T1-GE3 requirements.
6.How does Aetrix verify that SIC450ED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC450ED-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 SIC450ED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC450ED-T1-GE3?
All SIC450ED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC450ED-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 SIC450ED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC450ED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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