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Vishay Siliconix SIC479ED-T1-GE3
- Part No.:
- SIC479ED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- PowerPAK® MLP55-27
- Datasheet:
-
SIC479ED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP55-27
- Quantity:
- Payment:
- Shipping:
Inventory:4,280
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Product details
Overview
SIC479ED-T1-GE3 from Vishay Siliconix is a 3 A synchronous buck DC/DC converter with integrated high-side and low-side MOSFETs, operating from 4.5 V to 55 V input and delivering adjustable output down to 0.8 V. It features voltage-mode constant-on-time (COT) control, 2 MHz max switching frequency, ±1 % output voltage accuracy over -40 °C to +125 °C, and full protection suite including OCP, OVP, UVP, SCP, and OTP. It serves as a compact power supply solution in industrial computing and telecom infrastructure.
For engineers reviewing the SIC479ED-T1-GE3 datasheet, SIC479ED-T1-GE3 pinout, SIC479ED-T1-GE3 application, or SIC479ED-T1-GE3 equivalent, key selection considerations include its 3 A current rating (scalable within SiC47x family), MLP55-27L 5 mm × 5 mm package, programmable soft start via external capacitor, valley-current OCP with 2 A / 3 A / 4 A settings, and compatibility with all-ceramic output capacitors without external ESR networks.
Technical Context
The SIC479ED-T1-GE3 implements a voltage-mode constant-on-time (COT) control architecture with adaptive zero-current detection for seamless transition between continuous and discontinuous conduction modes. Its internal ramp generator and error amplifier enable ultrafast transient response without requiring external compensation components.
It integrates a monolithic power stage with optimized n-channel high-side and low-side MOSFETs, supports user-selectable operation modes (power-save or forced CCM) via MODE pin resistor, and delivers stable regulation across wide VIN/VOUT combinations - including 48 V input to 5 V/12 V outputs - while maintaining tight ripple control at light loads via diode emulation and frequency foldback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 55 V - supports direct connection to 12 V, 24 V, 48 V industrial and telecom rails without pre-regulation |
| Output Current Rating | 3 A continuous - matches SiC479 variant within pin-compatible SiC47x family (SiC476=12 A, SiC477=8 A, SiC478=5 A) |
| Output Voltage Accuracy | ±1 % from -40 °C to +125 °C - ensures stable core voltage for microcontrollers and FPGAs across extended temperature range |
| Switching Frequency Range | 100 kHz to 2 MHz - adjustable via external resistor on fSW pin; enables optimization of size vs. efficiency trade-off |
| Valley Current Limit | 2 A (ILIMIT = AGND), 3 A (ILIMIT = float), 4 A (ILIMIT = VDD) - programmable overcurrent threshold for system-level fault containment |
| Feedback Reference Voltage | 800 mV ±4 mV - precise 0.8 V internal reference enables accurate output setting with standard resistor dividers |
| Light-Load Efficiency | Diode emulation + frequency foldback - eliminates reverse inductor current and reduces switching losses below ~10 % load |
| Thermal Shutdown | 150 °C trip with 35 °C hysteresis - protects against sustained overload or poor heatsinking in enclosed enclosures |
Pinout & Package
Package: PowerPAK® MLP55-27L - 5 mm × 5 mm, 27-pin lead (Pb)-free thermally enhanced QFN with exposed thermal pad (PGND-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCIN | Internal regulator bias supply | Accepts 4.5–55 V input; powers VDD/VDRV LDOs; requires 0.1 μF decoupling to AGND |
| 2 PGOOD | Open-drain power-good indicator | Asserts high-Z when VFB is within ±10 % of target; requires external 10 kΩ pull-up to ≤5 V |
| 3 EN | Enable control input | High-voltage compatible (up to 55 V); internal weak pull-down prevents floating startup |
| 4 BOOT | High-side gate driver bootstrap | Connects via RC network to PHASE; sets gate drive voltage for high-side MOSFET |
| 5,6 PHASE | High-side source / low-side drain node | Switching node connecting integrated MOSFETs; requires low-inductance layout to PGND |
| 7,8,29 VIN | Main power input | Drain of high-side MOSFET; connect bulk capacitance directly to PGND pads |
| 9,10,11,17,30 PGND | Power ground return | Low-impedance return path for high-current switching; must be tied to thermal pad |
| 12,13,14 SW | Switch node | Internal connection point between MOSFETs; routes to external inductor |
| 15 GL | Low-side gate driver output | Drives gate of integrated low-side MOSFET; not user-accessible |
| 16 VDRV | Gate driver supply | 5.3 V LDO output; requires 4.7 μF ceramic cap to PGND; can be bypassed externally in Mode 3/4 |
| 18,21 NC | No connection | Internally unconnected; leave floating or ground per layout best practice |
| 19 SS | Soft-start timing input | Charged by internal 5 μA current source; capacitor value sets ramp time (tSS = 0.8 V × CSS / 5 μA) |
| 20 VOUT | Output voltage sense point | Direct connection to output rail for internal ripple injection; improves light-load stability |
| 22 VFB | Feedback input | Compares against 0.8 V reference; connects to resistor divider from VOUT to AGND |
| 23,28 AGND | Analog ground reference | Separate from PGND; tie pins together with short wide trace under IC; connect to PGND only at single point |
| 24 fSW | Frequency programming input | Resistor to AGND sets fSW: RfSW = VOUT × 1.9×10⁻¹⁰ / fSW |
| 25 ILIMIT | Current limit configuration | AGND = 2 A, float = 3 A, VDD = 4 A valley-current OCP threshold |
| 26 VDD | Bias supply output | 5 V LDO output; powers control circuitry; requires 1 μF decoupling to AGND |
| 27 MODE | Operating mode selection | Resistor to AGND selects power-save (Mode 1), forced CCM (Mode 2), or external VDRV (Modes 3/4) |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply wide-input operation | Eliminates need for auxiliary bias rails - accepts 4.5–55 V directly, including 48 V telecom and 24 V industrial inputs |
| Internally compensated loop | Stable with any capacitor type (ceramic, polymer, electrolytic); removes requirement for ESR-based compensation networks |
| Programmable valley-current OCP | Three discrete current-limit thresholds (2 A / 3 A / 4 A) set by ILIMIT pin state - simplifies fault margining across designs |
| Pre-bias start-up support | Prevents negative voltage spikes and excessive sinking current when output is pre-charged - critical for hot-swap and sequencing applications |
| Output voltage tracking & sequencing | Enables coordinated power-up/down of multiple rails using external resistive networks - essential for FPGA and multi-core SoC supplies |
| Voltage-mode COT control | Delivers <10 μs transient response with minimal output capacitance - reduces BOM count and board area vs. traditional current-mode controllers |
Applications
| Industrial Computing Power | Telecom Base Station Supply |
|---|---|
Use Scenario: Providing 3.3 V or 5 V bias to ARM-based edge controllers in DIN-rail mounted PLCs with 24 V or 48 V backplane input. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated output with fast load-step response to handle bursty I/O activity. Use Value: 98 % peak efficiency minimizes thermal stress in sealed enclosures; ±1 % accuracy ensures reliable MCU operation across temperature extremes. | Use Scenario: Generating 12 V intermediate bus for RF power amplifiers in 4G/5G macro base stations powered from -48 V DC distribution. IC Role / Device Role / Timing Role: High-voltage input buck stage converting -48 V (rectified) to 12 V, supporting dynamic PA bias modulation. Use Value: 55 V absolute max VIN rating accommodates line transients; programmable soft start prevents inrush into downstream capacitive loads. |
| Home Automation Hub | Robotics Motor Drive Logic Supply |
Use Scenario: Powering Wi-Fi/BLE SoCs and sensor interfaces in smart home gateways using 12 V wall adapter input. IC Role / Device Role / Timing Role: Compact, low-noise point-of-load regulator enabling silent operation and minimal EMI in consumer environments. Use Value: All-ceramic capacitor compatibility eliminates audible coil whine; power-save mode extends battery backup runtime during standby. | Use Scenario: Supplying 5 V logic power to motor driver ICs and position encoders in collaborative robot joints with 24 V main bus. IC Role / Device Role / Timing Role: Isolated secondary-side buck converter delivering clean, well-regulated voltage despite high dv/dt noise from adjacent motor switches. Use Value: Robust OVP/UVP/OTP protection prevents latch-up during motor stall or encoder fault conditions; PGOOD flag enables safe shutdown sequencing. |
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 | 3 A, 4.5–36 V input, fixed 500 kHz fSW, no valley-current OCP, requires external compensation | Limited to ≤36 V input; lacks programmable current limit and pre-bias start-up | Choose MP2451DT-LF-Z only if input voltage stays below 36 V and design tolerates fixed frequency and reduced protection scope. |
| TPS54332DR | 3 A, 3.5–28 V input, current-mode control, external compensation, 2.5 % VOUT accuracy | Narrower VIN range; lower accuracy; higher quiescent current (1.8 mA vs. 156 μA) | Select TPS54332DR when needing TI's WEBENCH integration or legacy current-mode stability requirements, but expect larger output capacitance and reduced light-load efficiency. |
Compared with MP2451DT-LF-Z and TPS54332DR, the SIC479ED-T1-GE3 offers broader 4.5–55 V input coverage, tighter ±1 % output accuracy, valley-current OCP with three settings, and true all-ceramic stability - making it superior for industrial and telecom applications demanding robustness and design flexibility.
Availability
SIC479ED-T1-GE3 is available at Aetrix Electronics and suitable for industrial computing, telecom infrastructure, and robotics applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for SIC479ED-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 MOSFETs, diodes, and integrated power solutions for demanding industrial and automotive applications.
The SiC47x family - including SIC479ED-T1-GE3 - was designed specifically for high-density, wide-input-voltage DC/DC conversion in space-constrained systems where efficiency, thermal performance, and protection integrity are critical.
FAQ
What is the maximum input voltage rating for the SIC479ED-T1-GE3?
The SIC479ED-T1-GE3 has an absolute maximum input voltage rating of 60 V referenced to PGND, with recommended operating range from 4.5 V to 55 V. Operation above 55 V is not advised for sustained use, as it exceeds the specified operational limits and may impact long-term reliability or trigger internal UVLO protections. The device is commonly deployed with 24 V and 48 V industrial rails.
Does the SIC479ED-T1-GE3 require external compensation components?
No, the SIC479ED-T1-GE3 uses an internally compensated voltage-mode constant-on-time (COT) control architecture and is stable with any output capacitor type - including all-ceramic configurations - without requiring external ESR networks or compensation capacitors. This eliminates design iteration time and reduces bill-of-materials cost compared to traditional current-mode controllers.
How is the output current limit configured on the SIC479ED-T1-GE3?
The SIC479ED-T1-GE3 valley-current overcurrent protection threshold is set via the ILIMIT pin: tying it to AGND selects 2 A, leaving it floating selects 3 A, and connecting it to VDD selects 4 A. These values correspond to the SiC479's rated 3 A continuous output and provide scalable fault margining without changing external components.
Can the SIC479ED-T1-GE3 operate with a pre-biased output?
Yes, the SIC479ED-T1-GE3 supports pre-bias start-up. When the FB pin senses voltage above the internal soft-start ramp level at power-on, the controller inhibits switching to prevent reverse current flow through the low-side MOSFET and avoid output voltage collapse or overshoot - a critical capability for hot-swap and redundant power systems.
What package type is used for the SIC479ED-T1-GE3?
The SIC479ED-T1-GE3 is housed in the PowerPAK® MLP55-27L package: a 5 mm × 5 mm, 27-pin lead (Pb)-free QFN with exposed thermal pad connected to PGND. This thermally enhanced package delivers high power density and efficient heat dissipation in compact PCB layouts typical of industrial and telecom equipment.
SIC479ED-T1-GE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- microBUCK®
- Package/Case:
- PowerPAK® MLP55-27
- 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):
- 4.5V
- Voltage - Input (Max):
- 55V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 3A
- Frequency - Switching:
- 100kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerPAK® MLP55-27
SIC479ED-T1-GE3 FAQ
1.How can I place an order for SIC479ED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC479ED-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 SIC479ED-T1-GE3 reliable?
The price and inventory of SIC479ED-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 SIC479ED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC479ED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC479ED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC479ED-T1-GE3?
SIC479ED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC479ED-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 SIC479ED-T1-GE3?
For technical support, including SIC479ED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC479ED-T1-GE3 requirements.
6.How does Aetrix verify that SIC479ED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC479ED-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 SIC479ED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC479ED-T1-GE3?
All SIC479ED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC479ED-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 SIC479ED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC479ED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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