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Vishay Siliconix SIC437CED-T1-GE3
- Part No.:
- SIC437CED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- 24-PowerWFQFN
- Datasheet:
-
SIC437CED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP44-24
- Quantity:
- Payment:
- Shipping:
Inventory:1,700
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Product details
Overview
SIC437CED-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. It is used in point-of-load (POL) regulation for industrial computing and telecom infrastructure.
For engineers reviewing the SIC437CED-T1-GE3 datasheet, SIC437CED-T1-GE3 pinout, SIC437CED-T1-GE3 application, or SIC437CED-T1-GE3 equivalent, key selection criteria include its external VDD/VDRV supply requirement below 4.5 V VIN, programmable 300–1000 kHz switching frequency, ultrasonic light-load operation (>20 kHz), and integrated OVP/OCP/OTP protection.
Technical Context
The SIC437CED-T1-GE3 implements voltage-mode constant-on-time (VM-COT) control with internal ramp generation and error amplifier compensation - eliminating need for external ESR networks or loop compensation components. Its architecture delivers ultrafast transient response using dual feedback paths: fast ripple-based correction and slow precision DC regulation.
This variant uses external VDD/VDRV supply (SiC43xC family), enabling stable operation at VIN as low as 3 V. It operates in ultrasonic mode (minimum fSW >20 kHz), avoiding audible noise while maintaining tight output ripple and regulation across load range from 0.01 A to 12 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 28 V - supports wide-input POL applications including 5 V, 12 V, and 24 V rails |
| Output Current | 12 A continuous - enables single-chip replacement of multi-phase controllers in space-constrained designs |
| Output Voltage Accuracy | ±1 % from –40 °C to +125 °C - ensures stable core voltage regulation under thermal stress |
| Switching Frequency | 300 / 500 / 750 / 1000 kHz - user-selectable via MODE1 resistor for EMI optimization and inductor sizing |
| Light-Load Mode | Ultrasonic (SiC43xC) - suppresses audible noise by limiting minimum fSW to >20 kHz |
| Feedback Reference | 600 mV ±3 mV - enables precise output setting with standard resistor dividers and low-error sensing |
| Peak Efficiency | 97 % at 12 VIN/1.2 VOUT - reduces thermal load and improves system power density |
Pinout & Package
Package: PowerPAK® MLP44-24L (4 mm × 4 mm, 0.5 mm pitch, 24-pin leadless).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2,22,26) | Input power rail connection | High-current path requiring multiple parallel pins and low-impedance PCB routing |
| PGND (Pins 3,4,13,27) | Power ground return | Separate from AGND; must be connected to thermal pad and solid ground plane for thermal and noise integrity |
| SW (Pins 5–9) | Switching node | High dv/dt node connecting to external inductor; requires minimized loop area and guard ring |
| GL (Pins 10,11,28) | Low-side MOSFET gate driver output | Drives integrated LS FET; not accessible externally - no external gate drive capability |
| VDRV (Pin 12) | Internal gate driver supply | Requires 2.2 μF decoupling to PGND; supplies HS/LS gate drivers independently of VDD |
| PGOOD (Pin 14) | Open-drain power-good flag | Asserts when VFB is within ±40 mV window of 0.6 V; needs external pull-up ≥10 kΩ |
| VDD (Pin 15) | Internal logic supply | Requires 1 μF decoupling to AGND; powered externally for SiC437CED-T1-GE3 (VIN < 4.5 V) |
| AGND (Pins 16,25) | Analog ground reference | Separate from PGND; connects FB, MODE, EN, and internal error amp - must be star-connected |
| FB (Pin 17) | Feedback input | Monitors output via resistor divider; senses VOUT directly at pin for pre-bias startup support |
| VOUT (Pin 18) | Output voltage sense | Provides Kelvin sensing path to improve regulation accuracy under load transients |
| EN (Pin 19) | Enable control | Active-high; internally pulled down to AGND via 5 MΩ - prevents false turn-on with floating GPIO |
| 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 selection | Resistor-to-VDD/AGND selects fSW (300–1000 kHz) and forces CCM or ultrasonic mode |
| BOOT (Pin 23) | Bootstrap capacitor connection | Connects to PHASE via 0.1 μF ceramic cap; supplies gate voltage for integrated high-side MOSFET |
| PHASE (Pin 24) | Bootstrap return path | AC-coupled node tied to SW; critical for proper HS gate drive during bootstrapping cycle |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic light-load operation | Maintains switching >20 kHz under all loads - eliminates audible coil whine in sensitive environments |
| External VDD/VDRV support | Enables full functionality at VIN as low as 3 V - essential for battery-powered or low-voltage industrial systems |
| Pre-bias start-up capability | Prevents negative current surge and output collapse when powering into pre-charged capacitors |
| Integrated OVP/UVP/OTP/OCP | Full fault coverage with auto-retry on UVP and hysteresis on OTP (150 °C trip, 125 °C recovery) |
| VM-COT architecture | No external compensation required - stable with any output capacitor type or ESR value |
| Adjustable current limit | OCP threshold set via MODE2 resistor (e.g., 18 A, 14 A, 9.7 A, or 5.4 A for SiC437) |
Applications
| Industrial PLC Power Rails | Telecom Base Station POL |
|---|---|
|
Use Scenario: Regulating 12 V or 24 V backplane inputs to 3.3 V or 5 V for FPGA I/O banks and microcontroller peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise intermediate bus conversion with sequencing support. Use Value: Ultrasonic mode eliminates acoustic noise in enclosed cabinets; ±1 % accuracy ensures reliable logic-level compliance across temperature. |
Use Scenario: Converting 48 V intermediate bus to 1.2 V core supply for baseband processors in 4G/5G remote radio units. IC Role / Device Role / Timing Role: High-current, high-efficiency POL regulator with fast transient response for burst-mode RF processing loads. Use Value: 12 A capability and 97 % peak efficiency reduce thermal footprint; VM-COT enables sub-10 µs load-step recovery without external compensation. |
| Server CPU Core Supply | Automated Test Equipment (ATE) |
|
Use Scenario: Delivering 1.0–1.8 V at up to 12 A to server CPU cores in compact rack-mounted compute modules. IC Role / Device Role / Timing Role: Main core voltage regulator supporting dynamic voltage scaling and precise enable sequencing with PGOOD monitoring. Use Value: External VDD/VDRV allows operation from 3.3 V auxiliary rail during low-power states; VOUT sense pin enables accurate remote sensing. |
Use Scenario: Generating stable, low-noise analog supply rails (e.g., ±5 V, ±12 V) for precision DACs and ADC front-ends in automated test instruments. IC Role / Device Role / Timing Role: Precision-regulated DC/DC stage with tight output tolerance and low ripple for metrology-grade signal chains. Use Value: ±1 % output accuracy and 600 mV reference ensure calibration stability; PGOOD flag enables synchronized system power-up. |
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 max output, 4.5–28 V input, fixed 500 kHz fSW, no external VDD option | Limited to lower-current applications; lacks ultrasonic mode and pre-bias start-up | Choose for cost-sensitive, low-power designs where 12 A capability and wide VIN flexibility are unnecessary |
| TPS54332DR | 3.5 A max output, 3.5–28 V input, adjustable fSW (100–2500 kHz), external compensation required | Requires external RC network for stability; no integrated VOUT sense or PGOOD hysteresis | Prefer when fine-grained loop tuning is needed, but avoid if minimizing BOM count and layout complexity is critical |
Compared with MP2451DT-LF-Z and TPS54332DR, the SIC437CED-T1-GE3 provides 3.4× higher current, true 3 V start-up with external bias, and fully integrated protection - making it suitable for high-density, thermally constrained POLs where reliability and acoustic performance matter.
Availability
SIC437CED-T1-GE3 is available at Aetrix Electronics and suitable for industrial computing, telecom infrastructure, and server power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SIC437CED-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 advanced MOSFET technologies.
The SiC43x family was designed specifically for high-current, high-density point-of-load regulation in computing, telecom, and industrial systems - integrating power stages, control, and protection in a thermally optimized MLP package.
FAQ
What input voltage range does the SIC437CED-T1-GE3 support, and how does it differ from SiC437AED-T1-GE3?
The SIC437CED-T1-GE3 supports 3 V to 28 V input, enabled by its external VDD/VDRV supply configuration (SiC43xC). In contrast, SiC437AED-T1-GE3 uses internal VDD/VDRV and requires minimum 4.5 V VIN. This makes SIC437CED-T1-GE3 uniquely suited for low-voltage battery or auxiliary-rail applications where the SIC437CED-T1-GE3 maintains full functionality below 4.5 V.
Does the SIC437CED-T1-GE3 require external compensation components?
No. The SIC437CED-T1-GE3 uses an internally compensated voltage-mode constant-on-time (VM-COT) architecture. All ramp generation and error amplifier compensation components are integrated, allowing stable operation with any output capacitor type or ESR - eliminating external RC networks and simplifying design validation for the SIC437CED-T1-GE3.
How is light-load efficiency managed in the SIC437CED-T1-GE3?
The SIC437CED-T1-GE3 operates in ultrasonic mode, reducing switching frequency under light load while maintaining minimum fSW >20 kHz to avoid audible noise. It combines diode emulation (turning off LS FET at zero current) and frequency foldback - both implemented autonomously - to maximize efficiency below 1 A without compromising regulation or requiring external control for the SIC437CED-T1-GE3.
What protection features are integrated into the SIC437CED-T1-GE3?
The SIC437CED-T1-GE3 integrates cycle-by-cycle overcurrent protection (OCP), output overvoltage (OVP) and undervoltage (UVP) protection with auto-retry, thermal shutdown with 25 °C hysteresis (150 °C trip), and UVLO on VDD. All protections are active during startup and runtime, and UVP/OVP thresholds are referenced to the 600 mV internal bandgap - ensuring robust fault handling across temperature for the SIC437CED-T1-GE3.
Can the SIC437CED-T1-GE3 be used in pre-biased output applications?
Yes. The SIC437CED-T1-GE3 monitors FB voltage during startup and disables switching if VFB exceeds the internal ramp reference - preventing reverse current flow through the low-side MOSFET and avoiding output voltage collapse. This pre-bias start-up feature is hardware-automated and requires no external circuitry, making the SIC437CED-T1-GE3 suitable for hot-swap and redundant power systems.
SIC437CED-T1-GE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- microBUCK®
- 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):
- 25.2V
- 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
SIC437CED-T1-GE3 FAQ
1.How can I place an order for SIC437CED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC437CED-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 SIC437CED-T1-GE3 reliable?
The price and inventory of SIC437CED-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 SIC437CED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC437CED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC437CED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC437CED-T1-GE3?
SIC437CED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC437CED-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 SIC437CED-T1-GE3?
For technical support, including SIC437CED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC437CED-T1-GE3 requirements.
6.How does Aetrix verify that SIC437CED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC437CED-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 SIC437CED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC437CED-T1-GE3?
All SIC437CED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC437CED-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 SIC437CED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC437CED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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