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Vishay Siliconix SIC424CD-T1-GE3
- Part No.:
- SIC424CD-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- PowerPAK® MLP44-28
- Datasheet:
-
SIC424CD-T1-GE3.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 44MLP-28
- Quantity:
- Payment:
- Shipping:
Inventory:2,129
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Product details
Overview
SIC424CD-T1-GE3 from Vishay Siliconix is a 6 A synchronous buck regulator with integrated power MOSFETs, bootstrap switch, and a 5 V / 200 mA LDO in a PowerPAK® MLP28-44GW package. It operates from 3 V to 28 V input, delivers 0.75 V–5.5 V output, supports 200 kHz–1 MHz switching, and targets point-of-load regulation in notebook and server power rails.
For engineers reviewing the SIC424CD-T1-GE3 datasheet, SIC424CD-T1-GE3 pinout, SIC424CD-T1-GE3 application, or SIC424CD-T1-GE3 equivalent, key selection criteria include its selectable power-save mode (no minimum frequency), adaptive on-time control for fast transient response, integrated LDO bypass logic, and programmable VIN UVLO via ENL pin.
Technical Context
The SIC424CD-T1-GE3 uses pseudo-fixed-frequency adaptive on-time control: on-time is dynamically set by an internal one-shot timer proportional to VOUT/VIN, enabling stable operation across wide input/output ranges without external compensation. Its valley-current limit protection is temperature-compensated and programmable via ILIM–LXS resistor.
Unlike SiC414, the SIC424CD-T1-GE3 implements true discontinuous conduction mode (DCM) power-save-disabling both FETs when inductor current reaches zero for 8 consecutive cycles-maximizing light-load efficiency without ultrasonic constraints. The integrated 5 V LDO features switch-over logic between VLDO and VOUT pins and supports independent enable (ENL) and bypass capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 3 V to 28 V - supports wide-input industrial and computing rails without pre-regulation |
| Output voltage range | 0.75 V to 5.5 V - enables core voltage scaling for modern processors and SoCs |
| Continuous output current | 6 A - sufficient for GPU I/O, DDR memory, and FPGA auxiliary rails |
| Switching frequency | 200 kHz to 1 MHz - adjustable via external RTON for optimal size/efficiency trade-off |
| LDO output | 5 V ±2% at 200 mA - powers gate drivers or external n-channel MOSFETs; bypassable for higher efficiency |
| Feedback reference | 0.75 V ±1% - enables precise output regulation with standard resistor dividers |
| Power good threshold | ±10% / ±20% window around VFB - provides robust rail monitoring under load transients |
Pinout & Package
Package: PowerPAK® MLP28-44GW (4 mm × 4 mm, 28-pin, exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Feedback input | Connects to resistor divider from VOUT to AGND; sets output voltage using 0.75 V internal reference |
| V5V | Bias supply input | Accepts external 3.3 V or 5 V; powers analog circuits and gate drivers when LDO is bypassed |
| AGND (Pins 3, 26, PAD1) | Analog ground | Reference for FB, ENL, ILIM, TON; must be separated from PGND for noise immunity |
| VOUT | Switcher output sense | Provides VOUT feedback path and enables internal VLDO-to-VOUT switch-over logic |
| VIN (Pins 5, 8–11, PAD2) | Main input supply | Distributes high-current input to internal FETs; multiple pins reduce IR drop and improve thermal performance |
| VLDO | LDO output | Delivers regulated 5 V / 200 mA; can drive external loads or gate drivers independently of main switcher |
| BST / LXBST | Bootstrap circuit | BST connects to capacitor; LXBST ties to LX node-forms floating supply for high-side gate drive |
| LX (Pins 15, 20, 21, PAD3) | Switching node | Phase node connecting internal high/low-side FETs; requires low-inductance layout to minimize EMI |
| PGND (Pins 13, 14, 16–19) | Power ground | High-current return path for LX and VIN; multiple pins reduce ground bounce and thermal resistance |
| PGOOD | Open-drain status indicator | Signals valid regulation after soft-start; requires external pull-up for system sequencing |
| ILIM / LXS | Current limit programming | ILIM–LXS resistor sets valley-current limit threshold (e.g., 5 kΩ = 4 A typical) |
| EN/PSV | Switcher enable & power-save control | Ground = disable; float = forced continuous mode; ≥45% V5V = power-save enabled (SiC424 only) |
| TON | On-time programming | Resistor to AGND sets tON, thereby determining operating frequency (200 kHz–1 MHz) |
| ENL | LDO enable & VIN UVLO input | Ground = LDO off; >2.6 V = LDO + switcher enabled; resistor divider enables programmable UVLO threshold |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive on-time control | Eliminates need for error amplifier or external compensation components; achieves <5 µs transient response |
| Select power-save mode (SiC424) | Disables both FETs at light load-no minimum frequency constraint-ideal for battery-powered systems |
| Integrated 5 V / 200 mA LDO with bypass logic | Reduces BOM count; allows external 5 V bias for peak efficiency or drives external n-MOSFETs |
| Programmable VIN UVLO via ENL pin | Enables custom brown-out protection using resistor divider-threshold adjustable from 2.4 V to 2.95 V |
| Smart power-save protection | Prevents OVP shutdown under active leakage loads by forcing DCM exit when VFB exceeds +10% |
| Temperature-compensated current limit | Maintains consistent overcurrent protection across -40 °C to +85 °C ambient without derating |
Applications
| Server Point-of-Load Regulation | Notebook Core Voltage Supply |
|---|---|
Use Scenario: Regulating 1.0 V @ 6 A for CPU I/O or memory interface in 1U rack servers. IC Role / Device Role / Timing Role: Primary synchronous buck controller with integrated FETs and LDO for gate drive bias. Use Value: Delivers >95% peak efficiency at full load while maintaining tight output regulation (<±1%) under dynamic load steps up to 6 A. |
Use Scenario: Generating 1.2 V for GPU or SoC cores in thin-and-light notebooks with strict thermal limits. IC Role / Device Role / Timing Role: High-density DC/DC converter managing transient response and light-load efficiency simultaneously. Use Value: Power-save mode reduces no-load quiescent current to 0.4 mA, extending battery runtime without audible switching noise. |
| Networking ASIC Power Rail | Industrial Embedded Controller Supply |
Use Scenario: Providing clean 3.3 V @ 4 A to FPGA transceivers in 10G Ethernet line cards. IC Role / Device Role / Timing Role: Buck regulator with programmable frequency (500 kHz) to avoid EMI-sensitive bands near SERDES clocks. Use Value: Adaptive on-time control ensures <30 mV output deviation during 4 A step loads, minimizing need for bulk capacitance. |
Use Scenario: Powering ARM-based PLC controllers requiring reliable 5 V for peripherals and isolated communication interfaces. IC Role / Device Role / Timing Role: Dual-function IC supplying main rail via buck stage and auxiliary 5 V via integrated LDO. Use Value: Independent ENL control allows coordinated startup sequencing-LDO powers MCU before enabling main switcher. |
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 LDO, fixed 2 MHz frequency | Targeted at low-current industrial sensors-not suitable for 6 A loads or LDO-bias requirements | Choose only for space-constrained 1 A designs where LDO integration is unnecessary |
| TPS54620RGYR | 17 V max input, 6 A output, external FETs required, 2.5 V–6 V VIN min, no integrated LDO | Requires external high-side/low-side MOSFETs and gate drivers-higher BOM cost and layout complexity | Select when input voltage is limited to ≤17 V and design flexibility justifies discrete FET implementation |
Compared with MP2451DT-LF-Z and TPS54620RGYR, the SIC424CD-T1-GE3 uniquely integrates both 6 A power stages and a 5 V LDO in a 4 mm × 4 mm package, enabling single-chip solutions for compute and networking rails where board area, efficiency across load range, and gate-drive bias simplicity are critical.
Availability
SIC424CD-T1-GE3 is available at Aetrix Electronics and suitable for server point-of-load regulation, notebook core voltage supply, networking ASIC power rails, and industrial embedded controller supply requiring stable component supply and long-term production continuity.
Supply support for SIC424CD-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 packaging technologies.
The SiC4xx family-including SIC424CD-T1-GE3-is designed for high-density, high-efficiency DC/DC conversion in computing, networking, and consumer electronics where integrated FETs, adaptive control, and multi-rail support are essential.
FAQ
What is the key functional difference between SIC424CD-T1-GE3 and SIC414CD-T1-GE3?
The SIC424CD-T1-GE3 implements a true discontinuous conduction mode (DCM) power-save feature with no minimum frequency limit, optimized for maximum light-load efficiency in battery-powered systems. In contrast, the SIC414CD-T1-GE3 uses ultrasonic power-save with a fixed 25 kHz minimum frequency to avoid audible noise-making it suitable for audio-sensitive applications but less efficient at very light loads. Both share identical pinout, package, and core buck architecture.
How is the switching frequency programmed on the SIC424CD-T1-GE3?
The SIC424CD-T1-GE3 switching frequency is set by an external resistor (RTON) connected between the TON pin and AGND. Using the formula RTON = 1 / (25 pF × fSW − 400 Ω × VIN), a 133 kΩ resistor yields ~300 kHz at VIN = 15 V and VOUT = 3 V. Frequency range is 200 kHz to 1 MHz; values outside this range may cause instability or reduced efficiency.
Can the integrated 5 V LDO in SIC424CD-T1-GE3 be disabled independently of the buck regulator?
Yes-the ENL pin provides independent control of the LDO. Driving ENL to AGND disables the LDO while leaving the buck regulator operational if EN/PSV is active. Conversely, grounding EN/PSV disables the buck stage but allows the LDO to remain active if ENL is pulled high. This enables flexible power sequencing-for example, powering MCU logic from the LDO before enabling the main 1.2 V rail.
What protection features does the SIC424CD-T1-GE3 include beyond overcurrent and overvoltage?
The SIC424CD-T1-GE3 includes cycle-by-cycle current limiting, under-voltage lockout (VIN UVLO programmable via ENL), soft-start and soft-shutdown, thermal shutdown at 150 °C (10 °C hysteresis), smart power-save protection (prevents OVP due to leakage currents), and valley-current sensing with temperature compensation. PGOOD provides open-drain fault signaling with 4 ms startup delay and 5 μs noise-immunity filtering.
Is the SIC424CD-T1-GE3 compatible with all-ceramic output capacitors?
Yes-the SIC424CD-T1-GE3 is explicitly designed for all-ceramic output solutions. Its adaptive on-time control architecture eliminates the need for output inductor DCR sensing or external compensation networks, allowing stable operation with low-ESR ceramic capacitors. Typical designs use 2–4 × 22 μF X5R/X7R 0805 or 1206 MLCCs without additional bulk electrolytics.
SIC424CD-T1-GE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- microBUCK®
- Package/Case:
- PowerPAK® MLP44-28
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 200kHz ~ 1MHz
- Voltage/Current - Output 1:
- 0.75V ~ 5.5V, 6A
- Voltage/Current - Output 2:
- 5V, 200mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 3V ~ 28V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerPAK® MLP44-28
SIC424CD-T1-GE3 FAQ
1.How can I place an order for SIC424CD-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC424CD-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 SIC424CD-T1-GE3 reliable?
The price and inventory of SIC424CD-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 SIC424CD-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC424CD-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC424CD-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC424CD-T1-GE3?
SIC424CD-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC424CD-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 SIC424CD-T1-GE3?
For technical support, including SIC424CD-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC424CD-T1-GE3 requirements.
6.How does Aetrix verify that SIC424CD-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC424CD-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 SIC424CD-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC424CD-T1-GE3?
All SIC424CD-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC424CD-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 SIC424CD-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC424CD-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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