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Vishay Siliconix SIC438BED-T1-GE3
- Part No.:
- SIC438BED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- 24-PowerWFQFN
- Datasheet:
-
SIC438BED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP44-24
- Quantity:
- Payment:
- Shipping:
Inventory:16,387
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Product details
Overview
SIC438BED-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 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 SIC438BED-T1-GE3 datasheet, SIC438BED-T1-GE3 pinout, SIC438BED-T1-GE3 application, or SIC438BED-T1-GE3 equivalent, key selection criteria include its 8 A continuous current rating, internal VDD/VDRV supply architecture, power-save light-load operation, and MLP44-24L package compatibility with thermal and layout constraints in space-constrained POL designs.
Technical Context
The SIC438BED-T1-GE3 implements a voltage-mode constant-on-time (VM-COT) control architecture with internally generated ramp signal and error amplifier compensation. It delivers ultrafast transient response without requiring external ESR networks and maintains stable regulation across wide VOUT ranges via automatic RAMP amplitude scaling.
This variant uses internal VDD/VDRV supply (no external bias needed above 4.5 V VIN), operates in power-save mode (diode emulation + frequency foldback), and integrates cycle-by-cycle OCP, OVP, UVP, OTP, and pre-bias startup protection - all configurable via MODE1/MODE2 resistor networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8 A continuous - defines maximum sustained load capability without thermal derating in standard PCB layouts. |
| Input Voltage Range | 3 V to 28 V - supports direct connection to 5 V, 12 V, and 24 V rails without intermediate regulation. |
| Output Voltage Accuracy | ±1 % from –40 °C to +125 °C - ensures tight regulation across full industrial temperature range without calibration. |
| Switching Frequency | 300 / 500 / 750 / 1000 kHz (programmable) - enables optimization of efficiency vs. size trade-off using discrete resistors on MODE1 pin. |
| Feedback Reference | 600 mV ±3 mV - sets precision output threshold for resistor-divider design; enables 0.6 V minimum VOUT with <1 % error. |
| Light Load Mode | Power-save (diode emulation + frequency foldback) - eliminates reverse inductor current and reduces switching losses below ~10 % load. |
| Thermal Protection | OTP at 150 °C with 25 °C hysteresis - auto-restarts after junction cools to 125 °C, preventing permanent shutdown during transient overload. |
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) | Primary input power rail | Accepts 3–28 V; multiple pins reduce IR drop and improve thermal spreading into PCB copper. |
| PGND (pins 3,4,13,27) | Power ground return | Low-inductance path for high di/dt switching currents; must be connected to solid thermal pad under package. |
| SW (pins 5–9) | Switching node | Connects to external inductor; high dv/dt node requiring minimized loop area and guard ring isolation. |
| GL (pins 10,11,28) | Low-side gate driver output | Drives LS MOSFET gate; tied internally to PGND during off-state; requires no external gate resistor. |
| VDRV (pin 12) | High-side gate driver supply | Internally regulated 5 V supply for HS gate drive; requires 2.2 μF decoupling to PGND. |
| PGOOD (pin 14) | Open-drain power-good flag | Asserts high when VFB is within ±40 mV of 600 mV reference; needs external pull-up ≥10 kΩ. |
| VDD (pin 15) | Internal logic supply | 5 V internal regulator output; powers control circuitry; requires 1 μF decoupling to AGND. |
| AGND (pins 16,25) | Analog ground reference | Reference for FB, MODE, EN; must be separated from PGND and connected at single point near IC. |
| FB (pin 17) | Feedback input | Monitors resistor divider output; high-impedance (2 nA bias) node sensitive to noise coupling. |
| VOUT (pin 18) | Output voltage sense | Direct connection to output capacitor; improves load regulation by compensating for PCB trace resistance. |
| EN (pin 19) | Enable control | Active-high logic input; internal 5 MΩ pull-down prevents floating; compatible with 1.6 V logic high threshold. |
| MODE2 (pin 20) | Soft-start & current limit select | Resistor-to-VDD/AGND sets soft-start time (3/6 ms) and OCP threshold (3.6–12 A for SiC438). |
| MODE1 (pin 21) | Frequency & operating mode select | Resistor-to-VDD/AGND selects fSW (300–1000 kHz) and forces CCM or enables power-save mode. |
| BOOT (pin 23) | Bootstrap capacitor connection | Connects to PHASE via 0.1 μF ceramic cap; supplies gate voltage for high-side MOSFET during conduction. |
| PHASE (pin 24) | Bootstrap return path | AC-coupled return for BOOT capacitor; must be routed with minimal inductance adjacent to SW node. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 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 with minimal external components. |
| VM-COT control | No external compensation required - internal ramp generator and error amplifier ensure stability with any output capacitor type or ESR. |
| Pre-bias startup | Prevents negative current surge when output is pre-charged - monitors FB voltage before enabling switching to avoid sinking excessive current. |
| Programmable protections | OCP threshold (3.6–12 A), soft-start time (3/6 ms), and UVLO hysteresis set via two external resistors - simplifies qualification across multiple board variants. |
| Ultralow quiescent current | 50 μA non-switching operating current and 0.5–3 μA shutdown current - extends battery life in always-on systems. |
Applications
| Industrial PLC I/O Modules | Telecom Line Cards |
|---|---|
|
Use Scenario: Regulating 1.2 V or 3.3 V core voltage for FPGA and microcontroller subsystems in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary POL regulator delivering 8 A peak current with fast transient response to handle burst-mode processing loads. Use Value: Internal compensation and pre-bias startup eliminate need for custom loop tuning or sequencing circuits, reducing BOM count by ≥3 passive components per rail. |
Use Scenario: Generating 5 V or 12 V auxiliary supply for SerDes, PHY, and management MCU on high-density line cards with strict thermal limits. IC Role / Device Role / Timing Role: High-efficiency buck converter operating at 500 kHz to balance EMI filtering requirements and inductor size constraints. Use Value: 97 % peak efficiency and 2 °C/W junction-to-case thermal impedance enable full 8 A load in 40 mm² footprint without forced air cooling. |
| Server DDR Memory Subsystems | Automated Test Equipment (ATE) |
|
Use Scenario: Providing tightly regulated 1.2 V VDDQ supply to DDR4/DDR5 memory modules with dynamic load steps up to 6 A/μs. IC Role / Device Role / Timing Role: Fast-transient buck regulator with ±1 % accuracy ensuring compliance with JEDEC VDDQ tolerance specifications. Use Value: VM-COT architecture achieves <10 μs recovery from 50 % load step without external compensation, meeting DDR timing margin requirements. |
Use Scenario: Powering mixed-signal ASICs and DAC/ADC front-ends in modular ATE chassis where low-noise, repeatable voltage accuracy is critical. IC Role / Device Role / Timing Role: Precision-adjustable POL converter with 600 mV ±3 mV reference and VOUT sense pin for remote sensing. Use Value: VOUT pin enables <0.5 % load regulation error across 0–8 A, eliminating need for post-regulation LDOs in metrology-grade signal chains. |
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 | 4.5–28 V input, 0.8 A max, external MOSFETs, no integrated power stage | Lower current, higher external component count, no pre-bias startup or VOUT sense | Select when cost sensitivity outweighs integration benefits and load < 2 A. |
| TPS54821RHLR | 4.5–20 V input, 8 A, external compensation, 1.5 % VREF accuracy, no power-save mode | Requires external RC network for stability; less efficient below 10 % load due to fixed-frequency operation | Select when FCCM-only operation is preferred and tighter EMI control via spread-spectrum is required. |
Compared with MP2451DT-LF-Z and TPS54821RHLR, the SIC438BED-T1-GE3 provides higher integration (integrated 8 A power stage), superior light-load efficiency (power-save mode), and enhanced system-level reliability (pre-bias startup, VOUT sense, ±1 % reference), making it optimal for compact, thermally constrained POL designs demanding fast transient response and minimal external components.
Availability
SIC438BED-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 SIC438BED-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 solutions with emphasis on efficiency, reliability, and miniaturization.
The SiC43x family was designed specifically for high-density point-of-load conversion in space-constrained industrial and telecom systems, integrating robust protection, programmable operation, and thermal-efficient packaging to replace multi-component discrete buck solutions.
FAQ
What is the maximum continuous output current supported by the SIC438BED-T1-GE3?
The SIC438BED-T1-GE3 supports 8 A continuous output current under recommended operating conditions (TA ≤ +105 °C, proper PCB thermal design). This rating is validated across the full input range (3–28 V) and output voltage range (0.6–20 V), with derating required only above ambient temperatures of +105 °C or with inadequate copper area.
Does the SIC438BED-T1-GE3 require external compensation components?
No, the SIC438BED-T1-GE3 does not require external compensation components. Its VM-COT control architecture integrates all necessary ramp generation and error amplifier compensation circuitry internally, enabling stable operation with any output capacitor type and ESR value - including low-ESR ceramic and polymer capacitors - without additional RC networks.
How is the switching frequency configured on the SIC438BED-T1-GE3?
The switching frequency of the SIC438BED-T1-GE3 is configured using a single resistor connected between MODE1 pin and either VDD or AGND. Four standard values yield 300 kHz (51 kΩ), 500 kHz (100 kΩ), 750 kHz (200 kΩ), or 1000 kHz (499 kΩ); forced CCM or power-save mode selection is determined by the same resistor connection polarity.
What protection features are integrated into the SIC438BED-T1-GE3?
The SIC438BED-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, input UVLO, and dedicated enable and power-good signaling - all implemented without external components.
Can the SIC438BED-T1-GE3 operate with a pre-biased output voltage?
Yes, the SIC438BED-T1-GE3 supports pre-bias startup. When the FB pin senses voltage above the internal reference ramp level prior to enable, the control logic inhibits switching to prevent reverse current flow through the low-side MOSFET and avoid output voltage collapse or overshoot - a critical feature for hot-swap and redundant power systems.
SIC438BED-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
SIC438BED-T1-GE3 FAQ
1.How can I place an order for SIC438BED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC438BED-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 SIC438BED-T1-GE3 reliable?
The price and inventory of SIC438BED-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 SIC438BED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC438BED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC438BED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC438BED-T1-GE3?
SIC438BED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC438BED-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 SIC438BED-T1-GE3?
For technical support, including SIC438BED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC438BED-T1-GE3 requirements.
6.How does Aetrix verify that SIC438BED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC438BED-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 SIC438BED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC438BED-T1-GE3?
All SIC438BED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC438BED-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 SIC438BED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC438BED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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