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Vishay Siliconix SIC477ED-T1-GE3
- Part No.:
- SIC477ED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- PowerPAK® MLP55-27
- Datasheet:
-
SIC477ED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP55-27
- Quantity:
- Payment:
- Shipping:
Inventory:4,175
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Product details
Overview
SIC477ED-T1-GE3 from Vishay Siliconix is an 8 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, internal compensation, and 2 MHz max switching frequency-designed for industrial computing, telecom power supplies, and robotics.
For engineers reviewing the SIC477ED-T1-GE3 datasheet, SIC477ED-T1-GE3 pinout, SIC477ED-T1-GE3 application, or SIC477ED-T1-GE3 equivalent, key selection criteria include valley current limit (5 A / 7.5 A / 10 A via ILIMIT pin), ±1 % VFB accuracy over –40 °C to +125 °C, power-good open-drain output, programmable soft-start, and MLP55-27L package thermal resistance of 2 °C/W junction-to-case.
Technical Context
The SIC477ED-T1-GE3 implements voltage-mode constant-on-time (COT) control with adaptive zero-current detection for DCM operation, enabling ultrafast transient response without external ESR networks. It uses internal ramp generation and a 0.8 V reference comparator to generate fixed on-time pulses, with minimum on-time of 45 ns and minimum off-time of 250 ns.
Its power stage integrates optimized N-channel MOSFETs delivering up to 98 % peak efficiency at 24 VIN/12 VOUT, while the VCIN/VDRV dual-bias architecture supports flexible supply configurations-including external 5 V VDRV to disable the internal LDO and reduce losses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8 A continuous-matches SiC477's rated scalable current level within the SiC47x family. |
| Input Voltage Range | 4.5 V to 55 V-supports wide-range industrial, telecom, and battery-derived rails without pre-regulation. |
| Feedback Voltage | 0.800 V ±0.8 % (–40 °C to +125 °C)-enables precise output regulation down to 0.8 V with ±1 % total output accuracy. |
| Switching Frequency | 100 kHz to 2 MHz-set externally via resistor on fSW pin; enables optimization of size, efficiency, and EMI. |
| Valley Current Limit | 5 A (ILIMIT = AGND), 7.5 A (ILIMIT = float), 10 A (ILIMIT = VDD)-configurable cycle-by-cycle OCP for robust overload handling. |
| Thermal Shutdown | 150 °C trip with 35 °C hysteresis-ensures safe recovery after overtemperature events without manual reset. |
| Power Good Output | Open-drain PGOOD with 25 μs blanking, 30–55 mV hysteresis, and 6–15 Ω on-resistance-provides reliable system sequencing and fault indication. |
Pinout & Package
Package: PowerPAK® MLP55-27L (5 mm × 5 mm, 27-pin lead-free QFN with exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCIN | Bias supply input for internal regulators | Accepts 4.5–55 V; decoupled with 0.1 μF to AGND; can be tied to VIN or lower rail to minimize LDO loss. |
| 2 PGOOD | Open-drain power-good indicator | Asserted high when VFB is within ±10 % of target; requires external pull-up; 25 μs glitch immunity. |
| 3 EN | Enable control input | High-voltage compatible (up to 55 V); internal weak pull-down prevents floating startup; no sequencing required. |
| 4 BOOT | High-side gate driver bootstrap node | Connected via RC network to PHASE; 4.7 Ω min series resistor recommended for stability. |
| 5,6 PHASE | High-side MOSFET source / switch-node return | Low-inductance path for gate drive return; must be routed with minimal loop area to PGND. |
| 7,8,29 VIN | Main power input | Drain of high-side MOSFET; requires local ceramic decoupling to PGND near pads. |
| 9,10,11,17,30 PGND | Power ground | High-current return for MOSFETs and input/output capacitors; separate from AGND to avoid noise coupling. |
| 12,13,14 SW | Switch node | Connects to inductor; high dv/dt node requiring tight layout and minimal trace length. |
| 15 GL | Low-side gate driver output | Direct drive signal to low-side MOSFET gate; not user-accessible in normal operation. |
| 16 VDRV | Internal gate driver supply output | 5.3 V typical LDO output; decoupled with 4.7 μF to PGND; can be bypassed with external 5 V supply in Mode 3/4. |
| 19 SS | Soft-start timing input | Charged by internal 5 μA current source; capacitor value sets ramp time per tSS = CSS × 0.8 V / 5 μA. |
| 20 VOUT | Output voltage sense point | Internal connection to ripple injection network; used for accurate regulation under light-load conditions. |
| 22 VFB | Feedback input | Compares against 0.8 V reference; connects to resistor divider from VOUT to AGND for output programming. |
| 23,28 AGND | Analog ground | Reference for VFB, SS, fSW, MODE, ILIMIT; must be shorted together and connected directly under IC with wide copper. |
| 24 fSW | Frequency setting input | Resistor to AGND sets switching frequency: RfSW = VOUT × 1.9×10−10 / fSW. |
| 25 ILIMIT | Current limit configuration | AGND = 50 % OCP (5 A), float = 75 % (7.5 A), VDD = 100 % (10 A) of SiC477's nominal valley limit. |
| 26 VDD | Core logic bias supply | 5 V internal LDO output; decoupled with 1 μF to AGND; UVLO threshold 4.0 V with 150 mV hysteresis. |
| 27 MODE | Operating mode select | Resistor to AGND selects PS mode (Mode 1), VDRV LDO disable (Modes 2–4), or external VDRV use (Modes 3/4). |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated loop | Stable with any output capacitor type-eliminates need for ESR tuning networks or complex compensation design. |
| Ultrafast transient response | Minimizes output capacitance requirement due to COT control and adaptive zero-current detection in DCM. |
| Programmable light-load efficiency | Diode emulation + frequency foldback reduces switching and conduction losses below ~10 % load. |
| Full fault protection suite | OCP (pulse-by-pulse), OVP (120 % VOUT), UVP (20 % VOUT), OTP (150 °C), SCP (hiccup), and UVLO on all supplies. |
| Pre-bias start-up support | Prevents negative current surge and output collapse when VOUT is pre-charged before enable. |
Applications
| Industrial Computing Power | Telecom Base Station PSU |
|---|---|
|
Use Scenario: Point-of-load conversion for FPGA I/O banks and ASIC core rails in ruggedized edge servers. IC Role / Device Role / Timing Role: Primary 8 A buck regulator delivering stable 1.2 V or 1.8 V from 12 V or 48 V backplane. Use Value: ±1 % output accuracy across –40 °C to +105 °C ambient ensures timing margin compliance in high-density compute modules. |
Use Scenario: Intermediate bus conversion in 5G remote radio units (RRUs) with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: 55 V-tolerant buck stage stepping 48 V to 5 V/3.3 V for RF front-end bias and digital control logic. Use Value: 2 MHz switching capability enables compact filter design and avoids critical LTE/5G band interference. |
| Robotics Motor Drive Logic Supply | Vending Machine Control Board |
|
Use Scenario: Powering microcontroller, sensor interface, and communication ICs in autonomous mobile robots operating from 24 V battery. IC Role / Device Role / Timing Role: High-efficiency 8 A regulator supplying 5 V to real-time control subsystems with dynamic load steps. Use Value: Ultrafast transient response maintains <50 mV droop during 4 A step loads, preventing MCU brownouts during motor commutation. |
Use Scenario: Main 5 V supply for bill validator, display, and cash dispenser logic in unattended retail kiosks. IC Role / Device Role / Timing Role: Robust buck converter handling wide-input transients (e.g., 4.5–55 V during battery swap or generator switchover). Use Value: Full protection set (OVP/UVP/OTP/SCP) ensures continuous operation despite voltage surges, brownouts, or shorted peripherals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPM3683-10 from Monolithic Power Systems | 8 A rating, 4.5–28 V input, fixed 10-pin QFN; lacks VCIN/VDRV flexibility and 55 V input capability. | Best suited for ≤28 V systems where board space is constrained; no pre-bias start-up or valley-current OCP configuration. | Select MPM3683-10 only if input stays below 28 V and simplified layout outweighs SiC477ED-T1-GE3's wide-VIN and configurability advantages. |
| TPS548B22 from Texas Instruments | 8 A, 4.5–18 V input, 12-pin HotRod QFN; includes PMBus interface and telemetry but no 55 V tolerance or internal VCIN LDO. | Preferred for digitally monitored server VRMs requiring telemetry and dynamic voltage scaling-not for industrial 48 V or battery-fed systems. | Choose TPS548B22 when digital control, telemetry, and multi-phase sync are required; avoid for >18 V inputs or analog-only designs. |
Compared with MPM3683-10 and TPS548B22, the SIC477ED-T1-GE3 uniquely supports 55 V input, dual-bias VCIN/VDRV architecture, and three-level valley-current OCP-all in the same MLP55-27L footprint-making it optimal for high-reliability industrial and telecom power where input range and fault configurability are critical.
Availability
SIC477ED-T1-GE3 is available at Aetrix Electronics and suitable for industrial computing, telecom base station power supplies, and robotics requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature and input voltage extremes.
Supply support for SIC477ED-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 solutions with emphasis on ruggedness, thermal performance, and reliability.
The SiC47x family-including SIC477ED-T1-GE3-is designed specifically for high-density, wide-input-voltage DC/DC conversion in harsh-environment applications such as industrial automation, telecom infrastructure, and embedded robotics.
FAQ
What is the maximum input voltage rating for the SIC477ED-T1-GE3?
The SIC477ED-T1-GE3 has an absolute maximum input voltage (VIN) rating of 60 V, with recommended operating range from 4.5 V to 55 V. Operation above 55 V is not advised for sustained use, as electrical specifications are guaranteed only within the recommended range. The device's power stage and gate drivers are optimized for this wide range, enabling direct compatibility with 48 V telecom, 36 V industrial, and 24 V automotive-derived supplies.
How does the ILIMIT pin configure overcurrent protection on the SIC477ED-T1-GE3?
The ILIMIT pin on the SIC477ED-T1-GE3 selects one of three valley-current OCP thresholds: tying to AGND sets 50 % of nominal (5 A), leaving it floating selects 75 % (7.5 A), and connecting to VDD selects 100 % (10 A). This configuration is active immediately after VDD exits UVLO and applies cycle-by-cycle limiting during low-side FET conduction. The setting directly scales the internal current-sense threshold without requiring external components.
Does the SIC477ED-T1-GE3 require external compensation components?
No, the SIC477ED-T1-GE3 is internally compensated and stable with any output capacitor type-including low-ESR ceramics-without external compensation networks. Its voltage-mode COT architecture uses an internal ramp generator referenced to the 0.8 V feedback node, eliminating the need for type-II or type-III compensation networks. This simplifies design, reduces BOM count, and improves robustness across capacitor aging and temperature variation.
Can the SIC477ED-T1-GE3 operate with a pre-biased output voltage?
Yes, the SIC477ED-T1-GE3 supports pre-bias start-up: if the FB pin senses voltage higher than the internal soft-start ramp at enable, the control logic inhibits switching to prevent reverse current flow through the low-side MOSFET and avoid output voltage collapse. This feature enables safe integration into systems where downstream circuitry may retain charge during power cycling, such as in hot-swap or redundant power architectures.
What thermal performance can be expected from the SIC477ED-T1-GE3 in the MLP55-27L package?
The SIC477ED-T1-GE3 in the MLP55-27L package has a thermal resistance of 2 °C/W junction-to-case and 12 °C/W junction-to-ambient (standard 2-layer board). With proper PCB copper pour (≥4 cm² thermal pad connected to internal ground planes), it sustains 8 A continuous output at 55 VIN/5 VOUT with junction temperatures below 125 °C at +70 °C ambient. Thermal shutdown activates at 150 °C with 35 °C hysteresis for automatic recovery.
SIC477ED-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:
- 8A
- 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
SIC477ED-T1-GE3 FAQ
1.How can I place an order for SIC477ED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC477ED-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 SIC477ED-T1-GE3 reliable?
The price and inventory of SIC477ED-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 SIC477ED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC477ED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC477ED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC477ED-T1-GE3?
SIC477ED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC477ED-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 SIC477ED-T1-GE3?
For technical support, including SIC477ED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC477ED-T1-GE3 requirements.
6.How does Aetrix verify that SIC477ED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC477ED-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 SIC477ED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC477ED-T1-GE3?
All SIC477ED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC477ED-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 SIC477ED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC477ED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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