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Vishay Siliconix SIC471ED-T1-GE3
- Part No.:
- SIC471ED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- PowerPAK® MLP55-27
- Datasheet:
-
SIC471ED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP55-27
- Quantity:
- Payment:
- Shipping:
Inventory:738
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Product details
Overview
SIC471ED-T1-GE3 from Vishay Siliconix is a 12 A, 4.5 V to 55 V input synchronous buck DC/DC converter with integrated high-side and low-side MOSFETs, adjustable 0.8 V output, and 2 MHz switching frequency - used in industrial computing power rails and telecom base station intermediate bus conversion.
For engineers reviewing the SIC471ED-T1-GE3 datasheet, SIC471ED-T1-GE3 pinout, SIC471ED-T1-GE3 application, or SIC471ED-T1-GE3 equivalent, key selection criteria include its 13 mΩ high-side RDS(on), ±1 % output voltage accuracy over –40 °C to +125 °C, programmable current limit via ILIMIT pin, ultrasonic mode enable/disable capability, and MLP55-27L package compatibility with thermal resistance of 2 °C/W junction-to-case.
Technical Context
The SIC471ED-T1-GE3 implements voltage-mode constant-on-time (COT) control with adaptive zero-current detection, enabling fast transient response and stable operation with ceramic output capacitors. Its architecture supports three operating modes - forced continuous conduction, power-save, and ultrasonic - selected via the MODE and ULTRASONIC pins.
It integrates dual N-channel MOSFETs (13 mΩ HS / 5 mΩ LS at 5.3 V VDRV), internal LDOs for VDD (5 V ±2.5%) and VDRV (5.3 V typ.), and full protection including pulse-by-pulse OCP, OVP/UVP with auto-retry, OTP with 35 °C hysteresis, and PGOOD open-drain flag.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 55 V - supports wide-range industrial and telecom inputs without external pre-regulation. |
| Output Current Rating | 12 A continuous - matches SiC471 variant within pin-compatible family; enables single-rail high-power point-of-load conversion. |
| Output Voltage Accuracy | ±1 % from –40 °C to +125 °C - ensures tight regulation across extended temperature range for mission-critical systems. |
| Switching Frequency | 100 kHz to 2 MHz - adjustable via resistor on fSW pin; allows optimization of size vs. efficiency trade-offs. |
| High-Side RDS(on) | 13 mΩ at VDRV = 5.3 V, TA = 25 °C - reduces conduction loss in high-current paths; validated for SiC471 variant. |
| Feedback Reference Voltage | 800 mV ±4 mV at 25 °C; ±8 mV over full temperature range - sets precise output voltage via external resistor divider on VFB pin. |
| Shutdown Current | 4 μA max - enables ultra-low-power standby in battery-backed or energy-sensitive applications. |
Pinout & Package
Package: PowerPAK® MLP55-27L - 5 mm × 5 mm, 27-pin lead-free enhanced thermally optimized QFN with exposed thermal pad (junction-to-case RθJC = 2 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCIN | Internal regulator supply input | Bias source for VDD/VDRV LDOs; can be tied to VIN or separate ≥5 V rail to reduce linear regulator losses. |
| 2 PGOOD | Open-drain power-good indicator | Signals regulated output status; requires external pull-up; asserts after soft-start completion and VFB > 0.82 V. |
| 3 EN | Enable control input | High-voltage compatible (up to 55 V); logic-high >1.35 V enables device; internal 5 MΩ pull-down prevents floating. |
| 4 BOOT | High-side gate driver bootstrap | Supplies floating voltage for HS MOSFET gate drive; requires external 0.1 μF ceramic capacitor to PHASE. |
| 5,6 PHASE | Power stage switch node return | Common connection point for HS source and LS drain; critical for layout low-inductance routing. |
| 7–8,29 VIN | Main power stage input | Connects to input bulk capacitor; shared with high-side MOSFET drain; handles up to 55 V DC. |
| 9–11,17,30 PGND | Power ground | Low-impedance return path for high-current switching loops; must be separated from AGND and tied at single point. |
| 12–14 SW | Switch node | Drain of LS MOSFET and source of HS MOSFET; connects to output inductor; high dv/dt node requiring careful layout. |
| 15 GL | Low-side gate driver output | Direct drive signal for LS MOSFET gate; not user-accessible - internal only. |
| 16 VDRV | Gate driver supply output | LDO output for HS/LS gate drive; 5.3 V typical; decoupled with 4.7 μF to PGND. |
| 18 ULTRASONIC | Ultrasonic mode control | Tie to VDD to enforce >20 kHz minimum frequency in DCM; float to disable and allow sub-audible operation. |
| 19 SS | Soft-start timing | Internal 5 μA current charges external capacitor to control output ramp time and inrush limiting. |
| 20 VSNS | Ripple injection feedback | Accepts VRAMP signal for stability with low-ESR capacitors; requires RC network (Rx/Cx/Cy) per design guidelines. |
| 21 COMP | Error amplifier output | Connects external compensation network (RCOMP/CCOMP) to stabilize control loop across load/line conditions. |
| 22 VFB | Feedback input | Monitors output via resistor divider; compares to 0.8 V reference to regulate VOUT down to 0.8 V. |
| 23,28 AGND | Analog ground | Reference for VFB, COMP, VSNS, MODE, ILIMIT, fSW; must be isolated from PGND except at single-point tie. |
| 24 fSW | Frequency setting | Resistor to AGND sets on-time and thus switching frequency from 100 kHz to 2 MHz. |
| 25 ILIMIT | Current limit programming | Resistor to AGND sets valley current limit threshold - 12 A nominal for SIC471ED-T1-GE3. |
| 26 VDD | Bias supply output | 5 V LDO output for internal logic; decoupled with 1 μF to AGND; UVLO threshold 4.25 V rising. |
| 27 MODE | Operating mode selection | Resistor to AGND selects among four configurations: power-save/forced CCM, internal/external VDRV sourcing. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range support | Operates from 4.5 V to 55 V single supply - eliminates need for pre-regulators in 12 V, 24 V, 48 V, and PoE++ systems. |
| Ultrafast transient response | Stable with minimal output capacitance due to COT control and VRAMP-based feed-forward path - reduces BOM count and board area. |
| Light-load efficiency optimization | Diode emulation + frequency foldback in power-save mode - achieves >85 % efficiency at 10 mA load with 12 VIN/5 VOUT. |
| Robust fault protection | Integrated OCP, OVP, UVP, SCP, OTP, and UVLO - enables autonomous recovery without system-level supervision. |
| Flexible sequencing & monitoring | PGOOD flag, pre-bias start-up, output voltage tracking, and programmable soft-start - simplifies multi-rail power system integration. |
Applications
| Industrial Computing Power Rail | Telecom Base Station Intermediate Bus |
|---|---|
|
Use Scenario: Providing 12 V or 5 V power to FPGA I/O banks, ASIC cores, or memory interfaces in programmable logic controllers and edge servers. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 12 A continuous current with <1 % output deviation under dynamic load steps. Use Value: Eliminates need for external MOSFET drivers and discrete current sense; reduces thermal footprint versus discrete solutions by 40 %. |
Use Scenario: Converting 48 V backplane voltage to 12 V intermediate bus in macro/micro base stations and remote radio units. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter supporting 2 MHz operation to shrink magnetics and filter components. Use Value: Achieves 98 % peak efficiency at 48 VIN/12 VOUT, reducing heat sink requirements and improving system power density. |
| Robotics Motor Drive Auxiliary Supply | Vending Machine Control Board Power |
|
Use Scenario: Generating clean 5 V or 3.3 V bias for microcontrollers, sensors, and communication ICs in mobile robotic platforms with 24 V battery input. IC Role / Device Role / Timing Role: Regulator with pre-bias start-up and output voltage tracking - ensures safe power sequencing during hot-swap events. Use Value: Maintains regulation during rapid input transients (e.g., motor commutation spikes); supports seamless firmware updates without brownouts. |
Use Scenario: Powering embedded control boards in ATMs, vending machines, and slot machines where reliability and long-term component availability are critical. IC Role / Device Role / Timing Role: Industrial-grade DC/DC converter with –40 °C to +105 °C ambient rating and 150 °C junction OTP protection. Use Value: Delivers 12-year field life expectancy with no derating required at full 12 A load in enclosed, convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPM3695-100 from Monolithic Power Systems | 10 A rated, 4.5–18 V input, integrated inductor; lacks 55 V input capability and programmable OCP. | Targeted at space-constrained consumer/portable designs; unsuitable for 48 V telecom or industrial inputs. | Select only if input voltage ≤18 V and board area is primary constraint - not drop-in for SIC471ED-T1-GE3. |
| TPS546D24A from Texas Instruments | 10 A, 4.5–18 V input, PMBus interface, digital control; no ultrasonic mode or VRAMP-based stability tuning. | Used where telemetry, margining, and dynamic configuration are required - adds complexity and cost. | Choose when digital monitoring and adaptive loop tuning outweigh analog simplicity and 55 V input support. |
Compared with MPM3695-100 and TPS546D24A, the SIC471ED-T1-GE3 provides unique 55 V input tolerance, analog-programmable protection thresholds, and proven stability with all-ceramic outputs - making it optimal for ruggedized industrial and telecom power stages where reliability trumps configurability.
Availability
SIC471ED-T1-GE3 is available at Aetrix Electronics and suitable for industrial computing power rails, telecom base station intermediate bus conversion, and robotics auxiliary supply applications requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for SIC471ED-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 telecom markets.
The SiC47x product line was designed specifically for high-current, wide-input-voltage point-of-load regulation in space- and thermal-constrained environments - emphasizing integration, efficiency, and robustness over digital configurability.
FAQ
What is the maximum input voltage supported by the SIC471ED-T1-GE3?
The SIC471ED-T1-GE3 supports an absolute maximum input voltage of 60 V on VIN and VCIN pins, with recommended operation from 4.5 V to 55 V. Exceeding 55 V may trigger internal UVLO or degrade long-term reliability; operation above 60 V risks permanent damage per Absolute Maximum Ratings.
How is the output current limit set on the SIC471ED-T1-GE3?
The output current limit for the SIC471ED-T1-GE3 is set using an external resistor connected between the ILIMIT pin and AGND. For the 12 A variant, a 60 kΩ resistor yields a nominal valley current limit of 15 A with ±20 % tolerance across temperature. The exact value is confirmed in the Electrical Specifications table on page 5 of Vishay document 75786.
Does the SIC471ED-T1-GE3 require external compensation components?
Yes, the SIC471ED-T1-GE3 requires external compensation components - specifically RCOMP and CCOMP connected between COMP and AGND - to stabilize the voltage-mode COT control loop. Vishay provides an online calculator (doc# 75760) to determine optimal values based on input/output conditions and selected ripple injection network.
Can the SIC471ED-T1-GE3 operate with only ceramic output capacitors?
Yes, the SIC471ED-T1-GE3 is explicitly designed to remain stable with all-ceramic output capacitors. This is achieved through its VRAMP-based feed-forward path (using VSNS pin with Rx/Cx/Cy network), which injects synthetic ripple to prevent subharmonic oscillation - a requirement detailed in the Operational Description section of the datasheet.
What thermal performance can be expected from the SIC471ED-T1-GE3 in a standard 4-layer PCB layout?
In a standard 4-layer PCB with 2 oz copper, 1 in² thermal pad exposure, and moderate airflow, the SIC471ED-T1-GE3 achieves junction-to-ambient thermal resistance of ~12 °C/W. With its 2 °C/W junction-to-case rating, this enables full 12 A operation at up to +70 °C ambient when using appropriate heatsinking or board copper pour per Vishay's MLP55-27L layout guidelines.
SIC471ED-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):
- 50.6V
- Current - Output:
- 12A
- Frequency - Switching:
- 20kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerPAK® MLP55-27
SIC471ED-T1-GE3 FAQ
1.How can I place an order for SIC471ED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC471ED-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 SIC471ED-T1-GE3 reliable?
The price and inventory of SIC471ED-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 SIC471ED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC471ED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC471ED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC471ED-T1-GE3?
SIC471ED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC471ED-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 SIC471ED-T1-GE3?
For technical support, including SIC471ED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC471ED-T1-GE3 requirements.
6.How does Aetrix verify that SIC471ED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC471ED-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 SIC471ED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC471ED-T1-GE3?
All SIC471ED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC471ED-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 SIC471ED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC471ED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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