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Vishay Siliconix SIC437AED-T1-GE3
- Part No.:
- SIC437AED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- 24-PowerWFQFN
- Datasheet:
-
SIC437AED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP44-24
- Quantity:
- Payment:
- Shipping:
Inventory:4,034
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Product details
Overview
SIC437AED-T1-GE3 from Vishay Siliconix is a 12 A synchronous buck DC/DC converter with integrated high-side and low-side MOSFETs, operating from 3 V to 28 V input and delivering adjustable output down to 0.6 V. It features ultrasonic light-load mode, ±1 % output voltage accuracy over –40 °C to +125 °C, and supports up to 1 MHz switching frequency. This regulator is deployed in point-of-load (POL) conversion for server CPU core rails and industrial computing power supplies.
For engineers reviewing the SIC437AED-T1-GE3 datasheet, SIC437AED-T1-GE3 pinout, SIC437AED-T1-GE3 application, or SIC437AED-T1-GE3 equivalent, key selection criteria include its 12 A continuous output capability, ultrasonic light-load operation (>20 kHz minimum frequency), internal VDD/VDRV supply architecture, MLP44-24L thermal performance, and VM-COT control for fast transient response with minimal external components.
Technical Context
The SIC437AED-T1-GE3 implements a voltage-mode constant-on-time (VM-COT) control architecture with internally generated ramp signal and error amplifier compensation. It uses RDS(on) current sensing for cycle-by-cycle overcurrent protection and integrates zero-crossing detection for diode emulation during light-load conditions.
This device operates in ultrasonic mode (SiC43xA variant), enforcing a minimum 20 kHz switching frequency to avoid audible noise, and supports four programmable frequencies (300/500/750/1000 kHz) via MODE1 resistor configuration. Its internal gate driver supplies VDRV at 5 V ±2.5%, and it requires no external ESR network due to fully internal loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 12 A continuous - supports high-density POL for CPU/GPU core rails without external current sharing. |
| Input voltage range | 3 V to 28 V - enables direct use on 5 V, 12 V, and 24 V intermediate bus systems without pre-regulation. |
| Output voltage accuracy | ±1 % from –40 °C to +125 °C - ensures stable regulation across industrial temperature range without calibration. |
| Switching frequency | Programmable 300/500/750/1000 kHz - allows optimization of inductor size vs. efficiency trade-off per design. |
| Light-load mode | Ultrasonic (SiC43xA) - maintains >20 kHz minimum frequency to eliminate audible noise in sensitive environments. |
| Peak efficiency | 97 % at 12 VIN/1.2 VOUT - reduces thermal load and improves system-level power density. |
| Feedback reference | 600 mV ±3 mV - enables precise output setting with standard resistor divider networks. |
Pinout & Package
The SIC437AED-T1-GE3 is housed in a PowerPAK® MLP44-24L package (4 mm × 4 mm, 0.85 mm height), featuring exposed thermal pad for enhanced heat dissipation and optimized PCB layout for high-current paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2,22,26) | Input power supply connection | Four parallel pins reduce IR drop and improve thermal spreading for 12 A input current handling. |
| PGND (Pins 3,4,13,27) | Power ground return | Dedicated low-impedance path for high di/dt switching currents; separate from analog ground to minimize noise coupling. |
| SW (Pins 5–9) | Switching node | Five-pin connection to inductor; minimizes parasitic inductance and voltage overshoot during high-speed transitions. |
| GL (Pins 10,11,28) | Low-side MOSFET gate drive | Three parallel outputs ensure robust turn-off of integrated low-side FET under heavy load conditions. |
| VDRV (Pin 12) | Internal gate driver supply | Requires 2.2 μF decoupling to PGND; powers high-side driver bootstrap circuitry independently of VDD. |
| PGOOD (Pin 14) | Open-drain power-good flag | Signals valid regulation (FB within ±10 % window); includes 25 μs blanking to reject transient false triggers. |
| VDD (Pin 15) | Internal logic supply | Supplies control circuitry; internally regulated from VIN when VIN ≥ 4.5 V; requires 1 μF decoupling to AGND. |
| AGND (Pins 16,25) | Analog ground reference | Separate ground for feedback and error amplifier; must be connected near FB pin to maintain accuracy. |
| FB (Pin 17) | Output voltage feedback | High-impedance (2 nA bias) input referenced to 600 mV; connects to resistor divider for output programming. |
| VOUT (Pin 18) | Output voltage sense | Direct connection to output rail for remote sensing; improves regulation accuracy under PCB trace resistance. |
| EN (Pin 19) | Enable control | Active-high logic input with 5 MΩ internal pull-down; supports easy sequencing and standby mode control. |
| MODE2 (Pin 20) | Soft-start & current limit selection | Resistor-to-VDD/AGND sets soft-start time (3 ms or 6 ms) and OCP threshold (e.g., 18 A for SiC437). |
| MODE1 (Pin 21) | Frequency & operating mode | Resistor-to-VDD/AGND selects switching frequency and forces CCM or ultrasonic mode (SiC43xA). |
| BOOT (Pin 23) | Bootstrap capacitor connection | Connects to PHASE via 0.1 μF ceramic capacitor to generate high-side gate drive voltage above VIN. |
| PHASE (Pin 24) | Bootstrap return path | Provides AC return for BOOT capacitor; tied directly to SW node during low-side conduction. |
Key Features
| Feature | Design Value |
|---|---|
| VM-COT control with internal ramp | Eliminates need for external RC compensation or high-ESR bulk capacitors while maintaining stability across all output voltages and loads. |
| Ultrasonic light-load operation | Maintains switching frequency >20 kHz under light load to prevent audible coil whine in office/server environments. |
| Pre-bias start-up support | Prevents negative current surge and output voltage collapse when powering into an already charged rail. |
| Integrated OVP/UVP/OTP/SCP | Full fault coverage with auto-retry on UVP and hysteresis-based OTP (150 °C trip, 125 °C recovery) for reliable field operation. |
| Adjustable soft-start & current limit | Configurable via two external resistors (MODE1/MODE2), enabling tailored inrush control and system-level current limiting. |
Applications
| Server CPU Core Rail | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Provides tightly regulated 0.8–1.2 V core voltage to multi-core Xeon or AMD EPYC processors in 1U rack servers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with VM-COT control ensuring sub-100 ns transient response to dynamic CPU load steps. Use Value: Delivers 12 A continuous current with ±1 % accuracy across –40 °C to +125 °C junction, enabling fanless or thermally constrained designs. |
Use Scenario: Powers isolated digital I/O channels and microcontroller peripherals in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Point-of-load regulator converting 24 V industrial bus to 3.3 V or 5 V logic rails with robust EMI immunity. Use Value: Ultrasonic mode eliminates audible noise during factory floor operation; integrated OVP/UVP protects against field wiring faults. |
| Notebook GPU Memory Rail | Telecom Baseband Processor |
|
Use Scenario: Supplies 1.1 V GDDR6 memory subsystem in thin-and-light notebooks where thermal headroom is limited. IC Role / Device Role / Timing Role: High-efficiency buck converter with 97 % peak efficiency minimizing localized heating near memory modules. Use Value: MLP44-24L package (4 mm × 4 mm) enables compact layout; VOUT sense pin compensates for PCB IR drop in dense routing. |
Use Scenario: Generates 1.0 V core supply for LTE/5G baseband SoCs in outdoor small-cell radio units. IC Role / Device Role / Timing Role: Industrial-grade POL regulator supporting –40 °C to +105 °C ambient with full protection set. Use Value: Integrated thermal shutdown with 25 °C hysteresis prevents repeated latch-up in sealed enclosures; PGOOD enables safe FPGA configuration sequencing. |
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 | 8 A rated, 2 MHz max fSW, external compensation required, no ultrasonic mode | Limited to lower current and higher-frequency designs; lacks integrated light-load optimization | Select when higher switching frequency is prioritized over light-load efficiency and acoustic noise suppression. |
| TPS54560QDGQRQ1 | 60 V input, 5 A output, current-mode control, external VSENSE resistor required | Targeted at automotive 12 V/24 V systems with wide input transients; not optimized for ultra-low VOUT | Choose for harsh environment applications requiring 60 V absolute max input rating and AEC-Q100 qualification. |
Compared with MP2451DT-LF-Z and TPS54560QDGQRQ1, the SIC437AED-T1-GE3 delivers higher current density (12 A), superior light-load efficiency via ultrasonic mode, and full internal compensation-making it optimal for space-constrained, thermally sensitive, and acoustically sensitive POL applications.
Availability
SIC437AED-T1-GE3 is available at Aetrix Electronics and suitable for server CPU core rails, industrial PLC I/O modules, and telecom baseband processor power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for SIC437AED-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-performance power management ICs and MOSFETs for industrial, computing, and telecom markets.
The SIC437AED-T1-GE3 belongs to Vishay's microBUCK® family of integrated synchronous buck regulators, designed specifically for high-current, high-efficiency point-of-load conversion in thermally and acoustically demanding environments.
FAQ
What is the maximum continuous output current supported by the SIC437AED-T1-GE3?
The SIC437AED-T1-GE3 supports 12 A continuous output current at ambient temperatures up to +105 °C with proper PCB thermal design. This rating is validated per Vishay's S20-0679-Rev. D datasheet under recommended operating conditions and assumes adequate copper area and airflow. Derating applies above 105 °C ambient or with reduced thermal vias.
Does the SIC437AED-T1-GE3 require external compensation components?
No, the SIC437AED-T1-GE3 does not require external compensation components. Its VM-COT control architecture integrates all necessary ramp generation and error amplifier compensation internally, enabling stable operation with any output capacitor type-including low-ESR ceramic arrays-without added RC networks.
How is light-load efficiency managed in the SIC437AED-T1-GE3?
The SIC437AED-T1-GE3 employs ultrasonic mode (SiC43xA variant) to manage light-load efficiency: it reduces switching frequency while maintaining >20 kHz minimum to avoid audible noise, and deploys diode emulation by turning off the low-side MOSFET at inductor current zero-crossing to eliminate recirculating losses.
What protection features are integrated into the SIC437AED-T1-GE3?
The SIC437AED-T1-GE3 integrates cycle-by-cycle overcurrent protection (OCP), output overvoltage protection (OVP), output undervoltage/short-circuit protection (UVP) with auto-retry, overtemperature protection (OTP) with 25 °C hysteresis, and input UVLO. All protections are hardware-based and operate independently of firmware or external supervision.
Can the SIC437AED-T1-GE3 operate with a 3.3 V input supply?
Yes, the SIC437AED-T1-GE3 supports 3 V to 28 V input, but operation below 4.5 V requires external VDD and VDRV supplies (SiC43xC/SiC43xD variants). The SIC437AED-T1-GE3 is the SiC43xA variant, which uses internal VDD/VDRV generation and is specified for VIN ≥ 4.5 V. For true 3.3 V input compatibility, SIC437CED-T1-GE3 must be selected instead.
SIC437AED-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):
- 28V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 12A
- Frequency - Switching:
- 300kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerPAK® MLP44-24
SIC437AED-T1-GE3 FAQ
1.How can I place an order for SIC437AED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC437AED-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 SIC437AED-T1-GE3 reliable?
The price and inventory of SIC437AED-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 SIC437AED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC437AED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC437AED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC437AED-T1-GE3?
SIC437AED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC437AED-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 SIC437AED-T1-GE3?
For technical support, including SIC437AED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC437AED-T1-GE3 requirements.
6.How does Aetrix verify that SIC437AED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC437AED-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 SIC437AED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC437AED-T1-GE3?
All SIC437AED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC437AED-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 SIC437AED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC437AED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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