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Vishay Siliconix SIC438CED-T1-GE3
- Part No.:
- SIC438CED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- 24-PowerWFQFN
- Datasheet:
-
SIC438CED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP44-24
- Quantity:
- Payment:
- Shipping:
Inventory:922
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Product details
Overview
SIC438CED-T1-GE3 from Vishay Siliconix is a synchronous buck DC/DC converter with integrated high-side and low-side MOSFETs, delivering up to 8 A continuous output current at up to 1 MHz switching frequency. It operates from 3 V to 28 V input, supports adjustable output down to 0.6 V, and features ultrasonic light-load mode for noise-sensitive industrial computing power supplies.
For engineers reviewing the SIC438CED-T1-GE3 datasheet, SIC438CED-T1-GE3 pinout, SIC438CED-T1-GE3 application, or SIC438CED-T1-GE3 equivalent, key selection criteria include its external VDD/VDRV supply requirement (VIN < 4.5 V), ±1 % output voltage accuracy over –40 °C to +125 °C, programmable 300–1000 kHz switching frequency, and ultrasonic operation mode to avoid audible noise in POL converters.
Technical Context
The SIC438CED-T1-GE3 implements voltage-mode constant-on-time (VM-COT) control with internal ramp generation and error amplifier compensation. Its architecture enables ultrafast transient response without requiring high-ESR output capacitors and delivers tight ripple regulation even at very light loads.
This variant uses external VDD and VDRV supplies (SiC43xC family), enabling stable operation down to 3 V input. It supports ultrasonic light-load mode (>20 kHz minimum switching frequency), pre-bias startup, output voltage tracking/sequencing, and full protection including cycle-by-cycle OCP, OVP, UVP, OTP, and PGOOD flag.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 28 V - supports wide-input POL conversion including 5 V, 12 V, and 24 V rails |
| Output Current | 8 A continuous - rated for sustained load in compact industrial and computing applications |
| Switching Frequency | 300 / 500 / 750 / 1000 kHz - user-selectable via MODE1 resistor for EMI and efficiency optimization |
| Feedback Accuracy | ±1 % from –40 °C to +125 °C - ensures stable regulation across full industrial temperature range |
| Light-Load Mode | Ultrasonic (SiC43xC) - maintains switching >20 kHz to eliminate audible noise in sensitive environments |
| Protection Features | OVP, UVP, cycle-by-cycle OCP, OTP with hysteresis, PGOOD flag - enables robust, self-protecting power delivery |
| Thermal Performance | RθJA = 16 °C/W - supports high-power density designs in MLP44-24L 4 mm × 4 mm package |
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 | Accepts 3–28 V input; multiple pins reduce IR drop and thermal stress |
| PGND (pins 3, 4, 13, 27) | Power ground return | Low-inductance path for high-current switch node return; separate from AGND |
| SW (pins 5–9) | Switching node | Connects to external inductor; high di/dt node requiring careful layout |
| GL (pins 10, 11, 28) | Low-side MOSFET gate driver output | Drives integrated low-side FET; tied internally to PGND during conduction |
| VDRV (pin 12) | Gate driver supply | Requires 2.2 μF decoupling to PGND; powers internal high-side gate driver |
| PGOOD (pin 14) | Open-drain power-good indicator | Asserts when VFB is within ±40 mV of 0.6 V reference; 25 μs blanking prevents false triggers |
| VDD (pin 15) | Internal logic supply | Requires 1 μF decoupling to AGND; UVLO threshold 3.6 V (±300 mV hysteresis) |
| AGND (pins 16, 25) | Analog ground reference | Reference for FB, MODE, EN; must be separated from PGND to minimize noise coupling |
| FB (pin 17) | Output voltage feedback | Monitors resistor divider; 600 mV internal reference with ±3 mV tolerance at 25 °C |
| VOUT (pin 18) | Output voltage sense | Direct connection to output for remote sensing; improves load regulation accuracy |
| EN (pin 19) | Enable control input | Active-high; internal 5 MΩ pull-down prevents floating; logic thresholds 1.6 V (high), 0.4 V (low) |
| MODE2 (pin 20) | Soft-start time & current limit selection | Resistor to VDD/AGND sets soft-start (3/6 ms) and OCP threshold (3.6–12 A for SiC438) |
| MODE1 (pin 21) | Switching frequency & operating mode | Resistor to VDD/AGND selects fSW (300–1000 kHz) and forces CCM or enables ultrasonic mode |
| BOOT (pin 23) | Bootstrap capacitor connection | Connects to PHASE via capacitor to generate high-side gate drive voltage above VIN |
| PHASE (pin 24) | Bootstrap return path | AC-coupled return for BOOT capacitor; tied to SW during low-side conduction |
Key Features
| Feature | Design Value |
|---|---|
| External VDD/VDRV support | Enables stable operation with input voltages as low as 3 V, eliminating need for auxiliary bias supply in low-VIN systems |
| Ultrasonic light-load mode | Maintains switching frequency >20 kHz under light loads to prevent audible coil whine in industrial and medical equipment |
| Pre-bias startup capability | Prevents negative current surge and output voltage collapse when powering into pre-charged output capacitors |
| Output voltage tracking & sequencing | Supports coordinated power-up/down of multiple rails using external resistive networks on VOUT and FB pins |
| Internally compensated VM-COT control | Eliminates need for external compensation components; stable with any ceramic output capacitor regardless of ESR |
| Full fault protection suite | Includes OVP/UVP latch, cycle-by-cycle OCP, OTP with 25 °C hysteresis, and open-drain PGOOD for system-level monitoring |
Applications
| Industrial PLC Power Supply | Embedded Computing Core Rail |
|---|---|
Use Scenario: Providing tightly regulated 1.2 V core voltage to ARM-based microcontrollers in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated FETs, delivering 8 A peak current and supporting pre-bias startup during hot-swap events. Use Value: ±1 % output accuracy over –40 °C to +125 °C ensures reliable CPU operation; ultrasonic mode eliminates acoustic noise in enclosed cabinets. |
Use Scenario: Generating 3.3 V I/O rail for FPGA and peripheral interfaces in ruggedized edge computing gateways. IC Role / Device Role / Timing Role: High-efficiency POL converter with output voltage tracking to coordinate with core rail sequencing. Use Value: 97 % peak efficiency reduces thermal load; PGOOD flag enables safe system boot sequence verification before FPGA configuration. |
| 5G Small Cell Baseband Power | Automated Test Equipment (ATE) Bias Supply |
Use Scenario: Delivering clean, low-noise 1.8 V supply to RF transceiver ICs in compact 5G small cell radios where EMI and thermal constraints are critical. IC Role / Device Role / Timing Role: High-frequency (1 MHz) buck regulator with fast transient response to handle dynamic baseband load steps. Use Value: VM-COT architecture achieves sub-10 µs transient recovery; ultrasonic mode avoids interference with sensitive RF bands. |
Use Scenario: Providing precision-adjustable 5 V analog bias to DACs and sensor front-ends in automated test instrumentation requiring low ripple and high stability. IC Role / Device Role / Timing Role: Programmable-output POL regulator with remote sensing (VOUT pin) and ±1 % accuracy for metrology-grade references. Use Value: VOUT sense pin enables <10 mV load regulation error; OVP/UVP protection safeguards expensive DUTs during fault conditions. |
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 | 36 V max input, 0.8 A output, no integrated FETs - requires external MOSFETs and compensation network | Lower current, lower integration - suitable only for sub-1 A auxiliary rails, not direct replacement | Select only for cost-sensitive, low-current applications where board space and BOM count are secondary concerns |
| TPS54821RHLR | 20 V max input, 8 A output, external VDD required below 4.5 V, but uses current-mode control and requires external compensation | Lacks ultrasonic mode and pre-bias startup - may generate audible noise and fail during hot-swap events | Consider only if existing design already uses TI's WEBENCH tools and requires pin-compatible upgrade path with minimal layout change |
Compared with MP2451DT-LF-Z and TPS54821RHLR, the SIC438CED-T1-GE3 offers higher integration (integrated FETs, internal compensation), superior light-load behavior (ultrasonic mode), and broader input range (3–28 V), making it optimal for space-constrained, noise-sensitive, and thermally demanding industrial POL applications.
Availability
SIC438CED-T1-GE3 is available at Aetrix Electronics and suitable for industrial PLCs, embedded computing core rails, 5G small cell baseband supplies, and automated test equipment bias supplies requiring stable component supply and long-term manufacturability.
Supply support for SIC438CED-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-reliability power management solutions for industrial, automotive, and computing markets.
The SiC43x family-including SIC438CED-T1-GE3-is designed for high-density, high-efficiency point-of-load conversion in space- and noise-constrained applications, emphasizing integration, thermal performance, and robust protection.
FAQ
What is the maximum continuous output current rating for the SIC438CED-T1-GE3?
The SIC438CED-T1-GE3 is rated for 8 A continuous output current at ambient temperatures up to +105 °C with proper PCB thermal design. This rating assumes use of the MLP44-24L package with adequate copper area and airflow. Derating applies above 105 °C ambient or with reduced thermal management.
Does the SIC438CED-T1-GE3 require external compensation components?
No, the SIC438CED-T1-GE3 does not require external compensation components. Its VM-COT control architecture integrates all necessary ramp generation and error amplifier compensation circuitry, ensuring stability with any ceramic output capacitor regardless of ESR value.
How does the ultrasonic mode function in the SIC438CED-T1-GE3?
The SIC438CED-T1-GE3 ultrasonic mode (SiC43xC variant) maintains switching frequency above 20 kHz during light-load conditions to eliminate audible noise. Unlike standard power-save modes, it avoids frequencies in the human hearing range while preserving regulation and minimizing output ripple.
Can the SIC438CED-T1-GE3 operate with a 3.3 V input supply?
Yes, the SIC438CED-T1-GE3 supports 3 V minimum input voltage, but requires external VDD and VDRV supplies when VIN < 4.5 V. In this configuration, VDD and VDRV must be supplied externally at 4.5–28 V, as specified for SiC43xC variants in the datasheet.
What protection features are integrated into the SIC438CED-T1-GE3?
The SIC438CED-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 a dedicated open-drain PGOOD flag for system monitoring.
SIC438CED-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):
- 25.2V
- Current - Output:
- 8A
- Frequency - Switching:
- 300kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerPAK® MLP44-24
SIC438CED-T1-GE3 FAQ
1.How can I place an order for SIC438CED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC438CED-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 SIC438CED-T1-GE3 reliable?
The price and inventory of SIC438CED-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 SIC438CED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC438CED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC438CED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC438CED-T1-GE3?
SIC438CED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC438CED-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 SIC438CED-T1-GE3?
For technical support, including SIC438CED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC438CED-T1-GE3 requirements.
6.How does Aetrix verify that SIC438CED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC438CED-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 SIC438CED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC438CED-T1-GE3?
All SIC438CED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC438CED-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 SIC438CED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC438CED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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