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Vishay Siliconix SIC437DED-T1-GE3
- Part No.:
- SIC437DED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- 24-PowerWFQFN
- Datasheet:
-
SIC437DED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP44-24
- Quantity:
- Payment:
- Shipping:
Inventory:7,465
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Product details
Overview
SIC437DED-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 power-saving mode, ±1 % output voltage accuracy over –40 °C to +125 °C, and supports 300–1000 kHz programmable switching frequency. It is used in point-of-load (POL) regulation for industrial computing and telecom infrastructure.
For engineers reviewing the SIC437DED-T1-GE3 datasheet, SIC437DED-T1-GE3 pinout, SIC437DED-T1-GE3 application, or SIC437DED-T1-GE3 equivalent, key selection criteria include its 12 A continuous current capability, internal compensation eliminating external ESR networks, ultrasonic/light-load efficiency optimization, and MLP-44L (4 mm × 4 mm) power-enhanced package compatibility with high-density PCB layouts.
Technical Context
The SIC437DED-T1-GE3 implements voltage-mode constant-on-time (VM-COT) control with internally generated ramp signal and dual-path feedback-fast ripple-based correction and slow error-amplifier DC regulation. Its architecture enables ultrafast transient response without requiring output capacitor ESR for loop stability.
This variant uses external VDD/VDRV supply (SiC43xD), operates in power-saving mode (diode emulation + frequency foldback), and supports pre-bias startup with output voltage tracking. Protection includes cycle-by-cycle OCP, OVP/UVP, OTP with 25 °C hysteresis, and open-drain PGOOD with 25 μs blanking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 12 A continuous - supports high-current POL rails without external current sharing. |
| Input Voltage Range | 3 V to 28 V - accommodates wide-input systems including 5 V, 12 V, and 24 V industrial rails. |
| Output Voltage Accuracy | ±1 % from –40 °C to +125 °C - ensures stable core voltage regulation across full thermal range. |
| Switching Frequency | 300 / 500 / 750 / 1000 kHz (programmable via MODE1 resistor) - enables layout-optimized noise and efficiency trade-offs. |
| Feedback Reference | 600 mV ±3 mV (TYP) - sets precise output threshold for resistor-divider design of any VOUT ≥ 0.6 V. |
| Light Load Mode | Power-save (SiC43xD) - disables LS recirculation and folds frequency to maintain >85 % efficiency at 10 mA load. |
| Thermal Shutdown | 150 °C trip with 25 °C hysteresis - prevents thermal runaway while enabling automatic recovery after cooling. |
Pinout & Package
Package: PowerPAK® MLP44-24L (4 mm × 4 mm, 0.5 mm pitch, exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2,22,26) | Input power supply rail | Accepts 3–28 V; multiple pins reduce IR drop and improve thermal spreading. |
| PGND (Pins 3,4,13,27) | Power ground return | Low-inductance path for high di/dt switch node currents; separate from AGND. |
| SW (Pins 5–9) | Switching node | Connects to inductor; high dv/dt node requiring tight layout and minimal trace length. |
| GL (Pins 10,11,28) | Low-side gate driver output | Drives LS MOSFET; paralleled pins reduce gate loop inductance and ringing. |
| VDRV (Pin 12) | Internal gate driver supply | Requires 2.2 μF decoupling to PGND; powers HS gate drive bootstrap circuit. |
| PGOOD (Pin 14) | Open-drain power-good flag | Asserts high when VFB is within ±6.7 % of 0.6 V reference; 7.5–15 Ω on-resistance. |
| VDD (Pin 15) | Internal logic supply | Requires 1 μF decoupling to AGND; UVLO threshold 3.6 V (±0.3 V) with 300 mV hysteresis. |
| AGND (Pins 16,25) | Analog ground reference | Reference for FB, MODE, EN; must be star-connected to avoid noise coupling into feedback path. |
| FB (Pin 17) | Output voltage feedback | Monitors resistor divider; 2 nA bias current enables high-impedance divider design. |
| VOUT (Pin 18) | Output voltage sense | Remote sensing input; improves regulation accuracy under PCB trace resistance. |
| EN (Pin 19) | Enable control | Active-high; 1.6 V min logic high, 0.4 V max logic low; internal 5 MΩ pull-down to AGND. |
| MODE2 (Pin 20) | Soft-start & current limit select | Resistor-to-VDD/AGND sets soft-start time (3/6 ms) and OCP threshold (5.4–18 A). |
| MODE1 (Pin 21) | Frequency & operation mode select | Resistor-to-VDD/AGND selects fSW (300–1000 kHz) and forces CCM or skip mode. |
| BOOT (Pin 23) | Bootstrap capacitor connection | Connects to PHASE via 0.1 μF ceramic; supplies gate voltage for HS MOSFET. |
| PHASE (Pin 24) | Bootstrap return path | AC-coupled return for BOOT capacitor; must be routed adjacent to SW for low loop inductance. |
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. |
| Adjustable soft start (3 ms or 6 ms) | Prevents inrush current during power-up; configured via MODE2 resistor to VDD or AGND. |
| Programmable OCP (5.4 A to 18 A) | Enables precise current limiting for different inductor and load combinations without redesigning protection circuitry. |
| Pre-bias startup support | Prevents negative voltage spikes and excessive current sink when output is pre-charged - critical for hot-swap applications. |
| Output voltage tracking & sequencing | Allows coordinated power-up/down with other rails using external resistive networks on FB and VOUT pins. |
| Ultrasonic light-load mode (SiC43xD) | Maintains switching above 20 kHz under light loads - avoids audible noise while preserving regulation. |
Applications
| Industrial Computing Power Rails | Telecom Point-of-Load Regulation |
|---|---|
Use Scenario: Providing stable 1.2 V/12 A core voltage to FPGA or ASIC in programmable logic controllers (PLCs) with ambient temperatures up to +105 °C. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated MOSFETs, handling full load transient steps without external compensation. Use Value: ±1 % output accuracy and 97 % peak efficiency reduce thermal stress and eliminate need for derating in convection-cooled enclosures. |
Use Scenario: Generating 3.3 V/12 A for baseband processing units in 5G remote radio heads where EMI compliance and thermal density are critical. IC Role / Device Role / Timing Role: High-frequency (750 kHz) POL converter with programmable frequency to shift switching noise away from sensitive RF bands. Use Value: Ultrasonic light-load mode suppresses audible noise during low-traffic periods while maintaining <15 mV output ripple. |
| Server Memory Subsystem Supply | Industrial Automation I/O Module |
Use Scenario: Delivering 1.8 V/12 A to DDR4 memory modules in edge servers with strict voltage tolerance (±30 mV) and fast load-step response. IC Role / Device Role / Timing Role: Fast-transient VM-COT controller with internal ramp generation - achieves <50 μs recovery from 0–100 % load step. Use Value: No external ESR requirement allows use of low-ESR polymer capacitors, reducing board area by 30 % vs. traditional designs. |
Use Scenario: Powering isolated analog front-ends and microcontrollers in factory-floor I/O modules exposed to 4 kV ESD and wide temperature swings. IC Role / Device Role / Timing Role: Robust POL regulator with 4 kV HBM ESD rating, OVP/UVP auto-retry, and -40 °C to +125 °C junction operation. Use Value: Integrated protection set eliminates need for discrete OVP, OTP, and current-limit ICs - simplifies safety certification. |
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 | 3 A rated, 2 MHz max fSW, no integrated LS MOSFET - requires external low-side switch. | Lower current capacity; suitable only for sub-5 A loads with simpler thermal management. | Select when cost-sensitive, low-power, and board space permits external FET layout. |
| TPS54560BQDDAQ1 | 6 A rated, 100 V max VIN, external compensation required, automotive AEC-Q100 qualified. | Higher input voltage range but lower output current; designed for harsh automotive environments. | Select for 12–48 V industrial systems needing AEC-Q100 reliability, not for 12 A POL needs. |
Compared with MP2451DT-LF-Z and TPS54560BQDDAQ1, the SIC437DED-T1-GE3 delivers 100 % higher continuous current in the same 4 mm × 4 mm footprint, integrates both power MOSFETs to eliminate gate-drive complexity, and provides factory-trimmed ±1 % accuracy without calibration - making it optimal for space-constrained, high-current industrial POLs.
Availability
SIC437DED-T1-GE3 is available at Aetrix Electronics and suitable for industrial computing, telecom infrastructure, and automated manufacturing systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for SIC437DED-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, precision, and thermal performance.
The SiC43x product line was engineered specifically for high-density, high-current point-of-load conversion in industrial and telecom equipment - integrating power stages, protection, and intelligent control in compact MLP packages.
FAQ
What is the maximum continuous output current supported by the SIC437DED-T1-GE3?
The SIC437DED-T1-GE3 supports 12 A continuous output current at ambient temperatures up to +105 °C with proper PCB copper area and airflow. This rating is validated per Vishay's S20-0679-Rev. D datasheet under standard thermal conditions using the MLP-44L package's RθJA of 16 °C/W. Derating applies above 85 °C ambient.
Does the SIC437DED-T1-GE3 require external compensation components?
No, the SIC437DED-T1-GE3 is internally compensated using its VM-COT architecture. The device stabilizes with any output capacitor type (ceramic, polymer, or electrolytic) without requiring external RC networks or ESR-dependent bulk capacitance - confirmed in Section 6 of the S20-0679-Rev. D datasheet.
How is light-load efficiency optimized in the SIC437DED-T1-GE3?
The SIC437DED-T1-GE3 uses power-saving mode (SiC43xD variant) that combines diode emulation (turning off the low-side MOSFET at zero inductor current) and frequency foldback. As load decreases, switching frequency scales downward while maintaining output ripple within specification - achieving >85 % efficiency at 10 mA output current.
Can the SIC437DED-T1-GE3 operate with a 3.3 V input supply?
Yes - the SIC437DED-T1-GE3 supports input voltages as low as 3 V. However, because it is a SiC43xD variant, it requires an external 4.5–28 V supply on VDD and VDRV pins when VIN < 4.5 V. This ensures proper gate drive strength for both MOSFETs across the full input range.
What protection features are integrated into the SIC437DED-T1-GE3?
The SIC437DED-T1-GE3 integrates cycle-by-cycle overcurrent protection (OCP), output overvoltage (OVP) and undervoltage (UVP) protection with auto-retry, overtemperature protection (OTP) with 25 °C hysteresis, input UVLO, and open-drain PGOOD monitoring - all detailed in Sections 7–8 of the S20-0679-Rev. D datasheet.
SIC437DED-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
SIC437DED-T1-GE3 FAQ
1.How can I place an order for SIC437DED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC437DED-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 SIC437DED-T1-GE3 reliable?
The price and inventory of SIC437DED-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 SIC437DED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC437DED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC437DED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC437DED-T1-GE3?
SIC437DED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC437DED-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 SIC437DED-T1-GE3?
For technical support, including SIC437DED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC437DED-T1-GE3 requirements.
6.How does Aetrix verify that SIC437DED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC437DED-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 SIC437DED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC437DED-T1-GE3?
All SIC437DED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC437DED-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 SIC437DED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC437DED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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