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Vishay Siliconix SIC438AED-T1-GE3
- Part No.:
- SIC438AED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- 24-PowerWFQFN
- Datasheet:
-
SIC438AED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP44-24
- Quantity:
- Payment:
- Shipping:
Inventory:3,923
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Product details
Overview
SIC438AED-T1-GE3 from Vishay Siliconix is an 8 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 used in point-of-load (POL) conversion for industrial computing and telecom power systems.
For engineers reviewing the SIC438AED-T1-GE3 datasheet, SIC438AED-T1-GE3 pinout, SIC438AED-T1-GE3 application, or SIC438AED-T1-GE3 equivalent, key selection criteria include its 8 A continuous current rating, internal VDD/VDRV supply architecture, ultrasonic light-load operation (>20 kHz minimum frequency), 0.6 V reference accuracy, and MLP44-24L package thermal performance.
Technical Context
The SIC438AED-T1-GE3 employs a voltage-mode constant-on-time (VM-COT) control architecture with internally generated ramp compensation, enabling fast transient response without external ESR networks. Its error amplifier and ramp generator are fully integrated, and RAMP amplitude is auto-scaled across output voltages and frequencies to maintain low jitter and regulation stability.
This variant uses internal VDD/VDRV generation (no external bias required above 4.5 V VIN) and operates exclusively in ultrasonic mode-suppressing audible noise by enforcing >20 kHz minimum switching frequency during light-load conditions. Protection includes cycle-by-cycle OCP, output OVP/UVP, thermal shutdown with 25 °C hysteresis, and pre-bias start-up support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8 A continuous - supports compact POL designs for mid-power FPGA, ASIC, or SoC rails |
| Input Voltage Range | 3 V to 28 V - enables direct use on 5 V, 12 V, and 24 V industrial input rails |
| Output Voltage Accuracy | ±1 % from –40 °C to +125 °C - ensures stable core voltage under wide thermal stress |
| Switching Frequency | Programmable: 300 / 500 / 750 / 1000 kHz - allows optimization of size vs. efficiency trade-offs |
| Light-Load Mode | Ultrasonic (SiC438A) - eliminates audible noise while maintaining regulation down to μA loads |
| Feedback Reference | 600 mV ±3 mV (typ.) - enables precise low-VOUT regulation with standard resistor dividers |
| Thermal Shutdown | 150 °C trip, 125 °C recovery - provides robust protection with 25 °C hysteresis for reliable restart |
Pinout & Package
The SIC438AED-T1-GE3 is housed in a thermally enhanced PowerPAK® MLP44-24L package (4 mm × 4 mm, 0.85 mm height), featuring exposed thermal pad for PCB heat sinking and optimized pin layout for minimal loop inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2,22,26) | Primary input power rail | Accepts 3–28 V; multiple pins reduce IR drop and improve high-current routing |
| PGND (Pins 3,4,13,27) | Power ground return | Separate from AGND; must be connected directly to thermal pad for optimal thermal and EMI performance |
| SW (Pins 5–9) | Switching node | Connects to output inductor; multi-pin layout minimizes parasitic inductance in high-dI/dt paths |
| GL (Pins 10,11,28) | Low-side MOSFET gate driver output | Drives internal LS FET; requires no external gate resistor due to integrated drive strength |
| VDRV (Pin 12) | High-side gate driver supply | Internally regulated 5 V supply; decoupled with 2.2 μF capacitor to PGND |
| PGOOD (Pin 14) | Open-drain power-good flag | Asserts after soft-start when VOUT is within ±10 % of target; 25 μs blanking prevents false triggers |
| VDD (Pin 15) | Internal logic supply | 5 V internal regulator output; decoupled with 1 μF capacitor to AGND |
| 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) | Feedback input | Monitors output via resistor divider; 2 nA bias current enables high-impedance sensing networks |
| VOUT (Pin 18) | Output voltage sense | Remote sense input for improved load regulation; connects directly to load for precision tracking |
| EN (Pin 19) | Enable control | Active-high logic input; internal 5 MΩ pull-down prevents floating startup |
| MODE2 (Pin 20) | Soft-start & current limit selection | Resistor-to-AGND/VDD sets soft-start time (3/6 ms) and OCP threshold (3.6–12 A) |
| MODE1 (Pin 21) | Frequency & operating mode | Resistor-to-AGND/VDD selects switching frequency (300–1000 kHz) and forces CCM if needed |
| BOOT (Pin 23) | Bootstrap capacitor connection | Connects to PHASE via 0.1 μF ceramic capacitor to generate HS gate drive voltage |
| PHASE (Pin 24) | Bootstrap return path | AC-coupled return for BOOT capacitor; must be routed with minimal trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual MOSFET power stage | HS RDS(on) = 10.1 mΩ, LS RDS(on) = 5.5 mΩ @ 25 °C - enables >97 % peak efficiency at 12 VIN/1.2 VOUT |
| Ultrasonic light-load operation | Minimum fSW > 20 kHz - eliminates audible coil whine while sustaining regulation down to 1 mA |
| Internal compensation & stability | No external ESR network or type-II/III compensation required - reduces BOM count and layout sensitivity |
| Pre-bias start-up support | Detects pre-charged output and inhibits switching until safe - prevents reverse current and output collapse |
| Comprehensive fault protection | OCP (pulse-by-pulse), OVP (0.72 V FB), UVP (0.54 V FB), OTP (150 °C), and UVLO (3.6 V VDD) - enables robust unattended operation |
| Adjustable soft-start & current limit | Configurable via single resistor on MODE2 - supports system-level sequencing and inrush control |
Applications
| Industrial PLC Power Rails | Telecom Line Card POL |
|---|---|
|
Use Scenario: Providing isolated 3.3 V or 5 V rails for I/O modules and communication interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable, low-noise output with fast transient response to handle bursty sensor and actuator loads. Use Value: Ultrasonic mode eliminates audible noise in enclosed cabinets; ±1 % accuracy maintains compliance with industrial interface voltage tolerances. |
Use Scenario: Generating 1.2 V core voltage for FPGA-based packet processing units on telecom line cards with strict thermal constraints. IC Role / Device Role / Timing Role: High-efficiency, high-density POL converter with remote sensing (VOUT pin) to compensate for PCB IR drop across backplane traces. Use Value: 8 A capability and MLP44-24L package enable compact layout; internal VDD/VDRV simplifies bias design versus external-supply variants. |
| Server Baseboard Management | Automated Test Equipment (ATE) |
|
Use Scenario: Powering BMC (Baseboard Management Controller) microcontrollers and monitoring ICs in enterprise servers where space and reliability are critical. IC Role / Device Role / Timing Role: Secondary buck regulator supplying 1.8 V or 2.5 V from 12 V mid-rail, with PGOOD signaling for system health monitoring. Use Value: Open-drain PGOOD with 25 μs blanking ensures clean sequencing; thermal shutdown with hysteresis prevents repeated latch-up in airflow-limited zones. |
Use Scenario: Delivering tightly regulated 1.0 V to 1.8 V supplies for high-speed ADC/DAC signal chains in modular ATE platforms. IC Role / Device Role / Timing Role: Precision voltage regulator with 600 mV ±3 mV reference and remote sensing to maintain <±10 mV load regulation across temperature. Use Value: VM-COT architecture delivers sub-10 μs transient recovery; adjustable frequency avoids interference with sensitive analog measurement bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315GJ-Z | 4 A rated, 2.5–36 V input, fixed 500 kHz fSW, no ultrasonic mode | Lacks light-load noise suppression; lower current capacity limits use to sub-5 A rails | Select when cost-sensitive, low-complexity 4 A POL is sufficient and audible noise is not a concern |
| TPS54821RHLR | 8 A rated, 4.5–20 V input, external compensation, forced CCM only | Requires external RC network; no power-save or ultrasonic modes; higher quiescent current | Choose when FCCM operation is mandatory and design team prefers full loop tuning control |
Compared with MP2315GJ-Z and TPS54821RHLR, the SIC438AED-T1-GE3 uniquely combines 8 A capability, ultrasonic light-load operation, internal compensation, and 3–28 V wide-input flexibility-making it optimal for thermally constrained, noise-sensitive industrial POLs requiring minimal external components.
Availability
SIC438AED-T1-GE3 is available at Aetrix Electronics and suitable for industrial computing, telecom infrastructure, and automated test equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for SIC438AED-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 SIC438AED-T1-GE3-is designed specifically for high-density, high-efficiency point-of-load conversion in space-constrained systems where thermal performance, low-noise operation, and simplified design are critical.
FAQ
What is the maximum continuous output current of the SIC438AED-T1-GE3?
The SIC438AED-T1-GE3 is rated for 8 A continuous output current under typical thermal conditions (TA ≤ 105 °C, proper PCB copper area). This rating assumes use of the MLP44-24L package with adequate thermal vias to inner ground planes and ambient airflow. Derating applies above 105 °C ambient or with limited board cooling.
Does the SIC438AED-T1-GE3 require external VDD or VDRV supplies?
No-the SIC438AED-T1-GE3 ('A' suffix) integrates internal VDD and VDRV regulators and operates from a single 3–28 V input supply. External bias is only required for 'C' and 'D' variants (SiC438CED-T1-GE3, SiC438DED-T1-GE3) when VIN drops below 4.5 V. For SIC438AED-T1-GE3, decoupling capacitors (1 μF on VDD, 2.2 μF on VDRV) to respective grounds are mandatory.
How is light-load efficiency optimized in the SIC438AED-T1-GE3?
The SIC438AED-T1-GE3 uses ultrasonic mode: as load decreases, it reduces switching frequency while maintaining >20 kHz minimum to avoid audible noise, then enters diode-emulation by turning off the low-side MOSFET at zero inductor current. This eliminates reverse conduction losses and sustains >85 % efficiency down to 10 mA output current.
What protection features does the SIC438AED-T1-GE3 include?
The SIC438AED-T1-GE3 integrates cycle-by-cycle overcurrent protection (OCP), output overvoltage (OVP at 0.72 V FB), undervoltage (UVP at 0.54 V FB), thermal shutdown (150 °C trip, 125 °C recovery), VDD UVLO (3.6 V), and pre-bias start-up inhibition. All protections trigger automatic restart after fault clearance, except UVP which retries after 20 soft-start periods.
Can the SIC438AED-T1-GE3 support output voltage tracking and sequencing?
Yes-the SIC438AED-T1-GE3 supports output voltage tracking and sequencing via its VOUT pin (remote sense) and programmable soft-start. By connecting the VOUT pin to another regulator's feedback node or using external timing circuits on MODE2, coordinated power-up/down sequences can be implemented-enabling safe startup of multi-rail FPGAs or processors.
SIC438AED-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:
- 8A
- 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
SIC438AED-T1-GE3 FAQ
1.How can I place an order for SIC438AED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC438AED-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 SIC438AED-T1-GE3 reliable?
The price and inventory of SIC438AED-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 SIC438AED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC438AED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC438AED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC438AED-T1-GE3?
SIC438AED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC438AED-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 SIC438AED-T1-GE3?
For technical support, including SIC438AED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC438AED-T1-GE3 requirements.
6.How does Aetrix verify that SIC438AED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC438AED-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 SIC438AED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC438AED-T1-GE3?
All SIC438AED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC438AED-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 SIC438AED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC438AED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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