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Vishay Siliconix SIC438DED-T1-GE3
- Part No.:
- SIC438DED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- 24-PowerWFQFN
- Datasheet:
-
SIC438DED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP44-24
- Quantity:
- Payment:
- Shipping:
Inventory:1,965
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Product details
Overview
SIC438DED-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, supporting 3 V–28 V input, adjustable 0.6 V–20 V output, and operating up to 1 MHz switching frequency. It targets point-of-load (POL) regulation in industrial computing, telecom power supplies, and embedded systems requiring high efficiency and fast transient response.
For engineers reviewing the SIC438DED-T1-GE3 datasheet, SIC438DED-T1-GE3 pinout, SIC438DED-T1-GE3 application, or SIC438DED-T1-GE3 equivalent, key selection criteria include its power-saving mode operation, ±1 % output voltage accuracy over –40 °C to +125 °C, internal compensation eliminating external ESR networks, and programmable soft start and current limit via MODE pins.
Technical Context
The SIC438DED-T1-GE3 implements voltage-mode constant-on-time (VM-COT) control with an internally generated ramp signal and error amplifier loop, enabling dual-path regulation-fast ripple-based correction and slow DC-setpoint tracking. Its architecture delivers ultrafast transient response with minimal output capacitance and eliminates need for external loop compensation components.
This device operates in power-save mode (SiC438D variant), disabling low-side MOSFET conduction at zero inductor current and reducing switching frequency under light load to maintain high efficiency. It supports pre-bias startup, output voltage tracking/sequencing, and features cycle-by-cycle OCP, OVP/UVP, OTP, and open-drain PGOOD monitoring-all without requiring external circuitry for basic stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8 A continuous - enables compact POL solutions for mid-power FPGA, ASIC, and microprocessor rails. |
| Input Voltage Range | 3 V to 28 V - supports wide-input industrial, telecom, and automotive-derived 5 V/12 V/24 V supply rails. |
| Output Voltage Range | 0.6 V to 0.9 × VIN (<20 V) - allows precise core voltage regulation down to sub-1 V for modern SoCs. |
| Switching Frequency | Programmable: 300/500/750/1000 kHz - balances efficiency, size, and EMI performance across designs. |
| Feedback Accuracy | ±1 % from –40 °C to +125 °C - ensures stable rail tolerance across full industrial temperature range. |
| Peak Efficiency | 97 % at 12 VIN/1.2 VOUT - minimizes thermal stress and improves system-level power density. |
| Light-Load Operation | Power-save mode with diode emulation - eliminates reverse inductor current and reduces switching losses below ~100 mA. |
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) | Primary input power supply | Accepts 3–28 V; multiple pins reduce IR drop and improve thermal path for high-current input routing. |
| PGND (Pins 3, 4, 13, 27) | Power ground return | Low-inductance return path for high di/dt switching currents; separate from AGND to avoid noise coupling. |
| SW (Pins 5–9) | Switching node | Connects to output inductor; high dv/dt node requiring tight layout and minimized loop area. |
| GL (Pins 10, 11, 28) | Low-side MOSFET gate driver output | Drives integrated low-side FET; not user-accessible-internal only. |
| VDRV (Pin 12) | Gate driver supply | Requires 2.2 μF decoupling to PGND; powers internal high-side gate driver stage. |
| PGOOD (Pin 14) | Open-drain power-good flag | Asserts when VFB is within ±40 mV of 0.6 V; requires external pull-up for system sequencing. |
| VDD (Pin 15) | Internal logic supply | Requires 1 μF decoupling to AGND; powers control circuitry and bias networks. |
| AGND (Pins 16, 25) | Analog reference ground | Reference for FB, MODE, EN; must be star-connected to minimize offset errors in feedback path. |
| FB (Pin 17) | Feedback input | Monitors resistor divider output; sets regulated VOUT = 0.6 V × (1 + RUP/RDOWN). |
| VOUT (Pin 18) | Output voltage sense | Direct connection to output rail for remote sensing; improves load regulation accuracy. |
| EN (Pin 19) | Enable control | Active-high logic input; internal 5 MΩ pull-down prevents floating enable during boot. |
| MODE2 (Pin 20) | Soft-start & current-limit programming | Resistor-to-VDD/AGND selects soft-start time (3 ms or 6 ms) and OCP threshold (3.6–12 A). |
| MODE1 (Pin 21) | Frequency & operating mode selection | Resistor-to-VDD/AGND configures switching frequency (300–1000 kHz) and forced CCM vs. power-save mode. |
| BOOT (Pin 23) | High-side gate bootstrap supply | Connects to PHASE via 0.1 μF ceramic capacitor; enables high-side FET drive above VIN. |
| PHASE (Pin 24) | Bootstrap return path | AC-coupled return for BOOT capacitor; tied directly to SW node in typical layout. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated VM-COT control | Eliminates need for external RC compensation network-reduces BOM count and layout sensitivity. |
| Programmable light-load behavior | Power-save mode (SiC438D) enables diode emulation and frequency foldback-boosts efficiency below 100 mA by >15 % vs. FCCM. |
| Full protection suite | Includes cycle-by-cycle OCP, output OVP/UVP with auto-retry, OTP with 25 °C hysteresis, and UVLO on VDD/VDRV-no external fault management required. |
| Pre-bias startup support | Prevents negative current surge and output collapse when powering into pre-charged rails-critical for hot-swap and multi-rail sequencing. |
| Output voltage tracking & sequencing | Enables coordinated ramp-up/down with other regulators using external resistive networks on FB/VOUT-supports complex SoC power sequencing. |
Applications
| Industrial Computing Power | Telecom Point-of-Load |
|---|---|
|
Use Scenario: Regulating 1.2 V core voltage for ARM-based industrial controllers operating from 12 V or 24 V backplane. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise core supply with fast load-step response. Use Value: ±1 % output accuracy over –40 °C to +105 °C ambient ensures reliable CPU operation across factory environments; 97 % peak efficiency reduces heatsink requirements. |
Use Scenario: Generating 3.3 V auxiliary rail for Ethernet PHYs and management controllers in 1 RU telecom switches. IC Role / Device Role / Timing Role: Secondary POL converter with PGOOD signaling for system-level power sequencing and fault reporting. Use Value: Programmable soft start (3 ms or 6 ms) prevents inrush current during hot-plug events; ultrasonic mode avoids audible noise in dense chassis. |
| Embedded System Core Supply | Automotive Infotainment Domain Controller |
|
Use Scenario: Delivering 0.85 V at 6 A to an FPGA fabric powered from a 5 V intermediate bus in medical imaging equipment. IC Role / Device Role / Timing Role: High-efficiency, low-ripple DC/DC stage with remote sensing (VOUT pin) compensating for PCB trace IR drop. Use Value: Internal ramp generation and fixed on-time architecture achieve <10 µs transient recovery-maintains timing margins during burst-mode processing. |
Use Scenario: Providing 1.8 V I/O supply for ADAS vision processor in vehicle infotainment head unit with 12 V battery input. IC Role / Device Role / Timing Role: Robust POL regulator with OVP/UVP/OTP protection meeting automotive functional safety expectations (no external supervision needed). Use Value: 3 V minimum input supports cold-crank operation; power-save mode extends standby battery life during parking mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2384CGG-Z | 8 A rated, 4.5–36 V input, fixed 500 kHz fSW, no MODE pin programmability, requires external compensation. | Lacks soft-start/current-limit configurability and pre-bias startup; simpler design but less flexible for multi-rail sequencing. | Choose MP2384CGG-Z for cost-sensitive, single-rail applications where fixed frequency and basic protection suffice. |
| TPS54821RHLR | 8 A rated, 4.5–20 V input, 300–1200 kHz programmable fSW, external compensation, integrated MOSFETs, but no VOUT sense pin. | Missing remote sensing (VOUT pin) and ultrasonic mode; higher quiescent current (100 µA vs. 50 µA) impacts light-load efficiency. | Choose TPS54821RHLR when TI ecosystem compatibility or higher max input voltage (20 V) is prioritized over thermal performance and sequencing fidelity. |
Compared with MP2384CGG-Z and TPS54821RHLR, the SIC438DED-T1-GE3 offers superior light-load efficiency via diode emulation, tighter output accuracy over temperature, and dedicated VOUT sensing for improved load regulation-making it optimal for thermally constrained, multi-rail embedded systems.
Availability
SIC438DED-T1-GE3 is available at Aetrix Electronics and suitable for industrial computing, telecom infrastructure, and embedded control applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for SIC438DED-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 ICs, MOSFETs, and precision analog devices for demanding industrial and automotive applications.
The SiC43x family-including SIC438DED-T1-GE3-is designed specifically for high-density, high-efficiency point-of-load conversion in space-constrained systems, emphasizing integration, thermal robustness, and simplified layout through internal compensation and comprehensive protection.
FAQ
What is the maximum continuous output current rating for the SIC438DED-T1-GE3?
The SIC438DED-T1-GE3 is rated for 8 A continuous output current under recommended operating conditions (TA ≤ +105 °C, proper PCB thermal design). This rating applies across its full input voltage range (3 V–28 V) and output voltage range (0.6 V–20 V), verified per Vishay's S20-0679-Rev. D datasheet Figure 22–33 efficiency curves and absolute maximum ratings table.
Does the SIC438DED-T1-GE3 require external compensation components for loop stability?
No, the SIC438DED-T1-GE3 uses internally compensated voltage-mode constant-on-time (VM-COT) control. All ramp generation and error amplifier compensation components (RCOMP, CCOMP) are integrated, enabling stable operation with any output capacitor-including low-ESR ceramic types-without external networks.
How is the switching frequency configured on the SIC438DED-T1-GE3?
Switching frequency is set via MODE1 pin (Pin 21): connect a resistor between MODE1 and AGND or VDD to select 300 kHz, 500 kHz, 750 kHz, or 1000 kHz. Resistor values are specified in Table 1 of the datasheet (e.g., 100 kΩ for 500 kHz). No external clock source or configuration register is needed.
What protection features are integrated into the SIC438DED-T1-GE3?
The SIC438DED-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, VDD/VDRV UVLO, and open-drain PGOOD monitoring-eliminating need for external fault management circuitry.
Can the SIC438DED-T1-GE3 operate with a 3.3 V input supply?
Yes-the SIC438DED-T1-GE3 supports input voltages as low as 3 V. However, for VIN < 4.5 V, an external supply must be provided to both VDD and VDRV pins (per Recommended Operating Conditions table, page 3), as the internal LDO cannot regulate from such low input.
SIC438DED-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
SIC438DED-T1-GE3 FAQ
1.How can I place an order for SIC438DED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC438DED-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 SIC438DED-T1-GE3 reliable?
The price and inventory of SIC438DED-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 SIC438DED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC438DED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC438DED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC438DED-T1-GE3?
SIC438DED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC438DED-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 SIC438DED-T1-GE3?
For technical support, including SIC438DED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC438DED-T1-GE3 requirements.
6.How does Aetrix verify that SIC438DED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC438DED-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 SIC438DED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC438DED-T1-GE3?
All SIC438DED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC438DED-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 SIC438DED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC438DED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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