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Vishay Siliconix SIC473ED-T1-GE3
- Part No.:
- SIC473ED-T1-GE3
- Manufacturer:
- Vishay Siliconix
- Package:
- PowerPAK® MLP55-27
- Datasheet:
-
SIC473ED-T1-GE3.pdf
- Description:
- IC REG BCK ADJ POWERPAK MLP55-27
- Quantity:
- Payment:
- Shipping:
Inventory:6,816
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Product details
Overview
SIC473ED-T1-GE3 from Vishay Siliconix is a 5 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 max switching frequency-designed for industrial computing, telecom power supplies, and robotics where wide VIN range and fast transient response are critical.
For engineers reviewing the SIC473ED-T1-GE3 datasheet, SIC473ED-T1-GE3 pinout, SIC473ED-T1-GE3 application, or SIC473ED-T1-GE3 equivalent, key selection considerations include its 32 mΩ high-side RDS(on), valley-current OCP set via ILIMIT resistor, ultrasonic mode enable/disable via ULTRASONIC pin, and compatibility with ceramic output capacitors without external ESR compensation.
Technical Context
The SIC473ED-T1-GE3 implements voltage-mode constant-on-time (COT) control with adaptive zero-current detection, enabling diode emulation in light-load DCM and frequency foldback for efficiency optimization. Its control loop uses dual feedback paths: steady-state regulation via VFB (0.8 V reference) and fast transient correction via VSNS with externally injected ripple (VRAMP).
It integrates a 5 A-rated power stage with 32 mΩ/22 mΩ high-side/low-side MOSFETs, supports programmable fSW (100 kHz–2 MHz) via RfSW, and delivers ±1 % VOUT accuracy across –40 °C to +125 °C. Protection includes 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 unregulated wall adapters, 48 V telecom rails, and industrial 24 V/36 V systems without pre-regulation. |
| Output Current Rating | 5 A continuous - matches SiC473 variant within pin-compatible SiC47x family; verified by RON_HS = 32 mΩ and RON_LS = 22 mΩ at TA = 25 °C. |
| Feedback Reference | 0.800 V ±0.8 mV (–40 °C to +125 °C) - enables precise output programming down to 0.8 V with <±1 % total error including divider tolerance. |
| Switching Frequency | 100 kHz to 2 MHz - set externally via RfSW; independent of VIN when VCIN = VIN, simplifying design across wide input ranges. |
| OCP Threshold | 5.6 A to 8.4 A (typ. 7 A) - set by resistor on ILIMIT pin; valley-current sensing ensures accurate current limiting under all load conditions. |
| Efficiency Peak | 98 % - achieved at mid-load with 48 VIN/5 VOUT; enabled by low RDS(on) MOSFETs and optimized gate drive architecture. |
| Shutdown Current | 4 μA to 8 μA - ultra-low quiescent draw enables always-on subsystems in battery-backed or energy-sensitive applications. |
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; can be tied to VIN or lower rail ≥5 V to reduce LDO losses-critical for high-VIN efficiency. |
| 2 PGOOD | Open-drain power-good indicator | Signals valid regulation when VFB > 0.96 V; requires external pull-up; used for sequencing and fault monitoring. |
| 3 EN | Enable control input | High-voltage compatible (0–55 V); logic-high >1.35 V enables regulator; internal 5 MΩ pulldown prevents floating startup. |
| 4 BOOT | High-side gate driver bootstrap node | Must be decoupled with 0.1 μF ceramic to PHASE; defines high-side gate voltage swing relative to SW node. |
| 5,6 PHASE | High-side source / low-side drain connection point | Direct connection to power inductor; carries full switching current and high dv/dt-requires tight layout and Kelvin routing. |
| 7,8,29 VIN | Main power stage input | Connects to bulk input capacitor; shared with VCIN in most designs; rated to 60 V absolute max. |
| 9,10,11,17,30 PGND | Power ground return | Low-impedance path for high di/dt currents; must be separated from AGND and connected at single point near VIN/PGND pads. |
| 12,13,14 SW | Switch node | Drives external inductor; experiences full VIN-to-GND swing at fSW; primary source of EMI-requires minimized loop area. |
| 15 GL | Low-side gate driver output | Directly drives low-side MOSFET gate; not user-accessible in integrated design but informs layout of gate loop integrity. |
| 16 VDRV | Internal gate driver supply | LDO output (5.3 V typ.); decoupled with 4.7 μF to PGND; can be bypassed with external 5 V supply in Mode 3/4 to eliminate LDO loss. |
| 18 ULTRASONIC | Ultrasonic mode control | Tie to VDD to enforce >20 kHz min fSW in DCM; float to allow sub-audible operation-key for noise-sensitive applications. |
| 19 SS | Soft-start timing capacitor node | Charged by 5 μA internal current; sets output ramp time; prevents inrush into large output capacitance. |
| 20 VSNS | Ripple injection feedback for stability | Accepts VRAMP network (Rx/Cx/Cy); enables stable operation with ceramic caps by injecting controlled AC signal into control loop. |
| 21 COMP | Error amplifier output | Connects external RCOMP/CCOMP for loop compensation; sets crossover frequency and phase margin per design requirements. |
| 22 VFB | Output voltage feedback input | Monitors resistive divider from VOUT; compares to 0.8 V reference; determines regulation accuracy and load transient response. |
| 23,28 AGND | Analog ground reference | Reference for VFB, COMP, VSNS, MODE, ILIMIT, fSW, SS, ULTRASONIC; must be isolated from PGND except at single star point. |
| 24 fSW | Switching frequency set resistor | Connects RfSW to AGND; sets on-time and thus fSW; value selected per target frequency and VIN/VOUT ratio. |
| 25 ILIMIT | Over-current limit set resistor | Connects RILIM to AGND; programs valley-current OCP threshold; enables precise current limiting without sense resistor. |
| 26 VDD | Internal bias supply output | 5 V LDO output (4.75–5.25 V); powers control circuitry; decoupled with 1 μF to AGND; UVLO threshold = 4.25 V. |
| 27 MODE | Operating mode configuration | Resistor-programmable (0–1.1 MΩ) to select power-save/forced-CM/external VDRV modes; supports dynamic reconfiguration. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-mode COT control | Delivers <100 ns load transient response with minimal output capacitance; eliminates need for complex loop compensation tuning. |
| Integrated 5 A power stage | 32 mΩ/22 mΩ high-side/low-side RDS(on) enables compact 5 A solution without external MOSFETs or drivers-reducing BOM count and layout area. |
| Programmable ultrasonic mode | Prevents audible noise in consumer/robotics apps by enforcing >20 kHz switching in DCM; disabled via floating ULTRASONIC pin for lowest quiescent operation. |
| Full protection suite | OCP (pulse-by-pulse), OVP/UVP (auto-retry), OTP (150 °C trip, 115 °C restart), UVLO on VCIN/VDD/VDRV-ensures robust field reliability without external supervision. |
| Flexible bias architecture | Supports internal VDRV LDO or external 5 V supply (Mode 3/4), reducing power loss up to 500 mW at high VIN-critical for thermally constrained designs. |
Applications
| Industrial Motor Drives | Telecom Base Station Power |
|---|---|
|
Use Scenario: Powering FPGA I/O banks and auxiliary rails in 48 V-powered remote radio units (RRUs) with strict thermal and size constraints. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering 3.3 V/5 A from 48 V backplane, handling rapid load transients during RF burst transmission. Use Value: 98 % peak efficiency and 2 MHz capability minimize heatsink size and enable dense PCB layouts; PGOOD enables safe FPGA configuration sequencing. |
Use Scenario: Generating 12 V intermediate bus for downstream POL converters in macrocell base station power shelves. IC Role / Device Role / Timing Role: High-efficiency intermediate converter operating from –48 V DC (with polarity-reversal protection) or 48 V nominal input. Use Value: 4.5–55 V input range accommodates legacy –48 V telecom systems and modern 54 V PoE++ infrastructure; OVP/UVP prevent cascading failures in multi-rail systems. |
| Robotics Actuator Control | Industrial PLC I/O Modules |
|
Use Scenario: Supplying 5 V/5 A to servo motor controllers and IMU sensor clusters in collaborative robots requiring silent operation. IC Role / Device Role / Timing Role: Main system rail converter with ultrasonic mode enabled to suppress audible coil whine during low-speed positioning. Use Value: ULTRASONIC pin allows seamless transition between quiet (<20 kHz suppressed) and ultra-efficient (sub-kHz DCM) modes-extending battery life without acoustic compromise. |
Use Scenario: Providing isolated 3.3 V logic supply for microcontroller and CAN transceiver in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Input-stage buck regulator accepting wide-range 24 V/48 V industrial supply, feeding isolated DC/DC for functional safety separation. Use Value: –40 °C to +125 °C operating junction temperature and ±1 % VFB accuracy ensure reliable operation in uncooled enclosures; EN pin enables centralized power management. |
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 rating, 4.5–36 V input, no integrated low-side FET (external sync rectifier required), fixed 500 kHz fSW | Limited to ≤36 V input; lacks OVP/UVP auto-retry and ultrasonic mode; requires external MOSFET and gate driver. | Select when cost sensitivity outweighs performance; avoid for >36 V or noise-critical 48 V telecom/industrial apps. |
| TPS54560QDGQRQ1 | 5 A, 3.5–60 V input, current-mode control, integrated high-side FET only, external low-side Schottky needed | Requires external diode for DCM; no valley-current OCP; lower light-load efficiency due to fixed-frequency PWM. | Prefer for automotive AEC-Q100 compliance; unsuitable for ceramic-cap-only designs or where >2 MHz fSW is needed. |
Compared with MP2451DT-LF-Z and TPS54560QDGQRQ1, the SIC473ED-T1-GE3 provides higher integration (dual MOSFETs), wider input range (to 55 V), superior light-load efficiency via diode emulation, and comprehensive protection-making it optimal for space-constrained, high-reliability industrial and telecom systems.
Availability
SIC473ED-T1-GE3 is available at Aetrix Electronics and suitable for industrial motor drives, telecom base station power, robotics actuator control, and PLC I/O modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for SIC473ED-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 MOSFETs, diodes, and integrated power solutions with emphasis on efficiency, reliability, and thermal performance.
The SiC47x family-including SIC473ED-T1-GE3-is designed for high-density, wide-input-voltage DC/DC conversion in industrial, telecom, and computing applications where integrated power stages, fast transient response, and robust protection are mandatory.
FAQ
What is the maximum input voltage rating for the SIC473ED-T1-GE3?
The SIC473ED-T1-GE3 has an absolute maximum input voltage rating of 60 V on VIN and VCIN pins, with recommended operating range from 4.5 V to 55 V. Operation above 55 V risks exceeding safe operating area limits and may trigger internal UVLO or damage the integrated MOSFETs. Always observe derating guidelines per Vishay Document 75786.
How is output current limited on the SIC473ED-T1-GE3?
The SIC473ED-T1-GE3 implements valley-current overcurrent protection (OCP) using RDS(on) sensing of the low-side MOSFET. The OCP threshold is set by an external resistor on the ILIMIT pin, with typical values ranging from 5.6 A to 8.4 A depending on RILIM. This pulse-by-pulse protection activates immediately after VDD UVLO release and remains active during normal operation.
Can the SIC473ED-T1-GE3 operate with all-ceramic output capacitors?
Yes-the SIC473ED-T1-GE3 supports all-ceramic output capacitors via its VSNS pin and external VRAMP network (Rx/Cx/Cy). Unlike conventional COT regulators, its dual-loop architecture (VFB + VSNS) maintains stability with low-ESR ceramics. Minimum recommended VRAMP amplitude is 100 mV; Vishay's online calculator (Doc. 75760) assists in selecting correct component values.
What is the purpose of the ULTRASONIC pin on the SIC473ED-T1-GE3?
The ULTRASONIC pin enables or disables ultrasonic switching mode: tying it to VDD forces minimum fSW > 20 kHz to eliminate audible noise in robotics or consumer devices; floating it allows sub-kHz operation in DCM for maximum light-load efficiency. This pin directly controls whether power-save mode enforces frequency foldback above or below the audio band.
Does the SIC473ED-T1-GE3 require external compensation components?
Yes-the SIC473ED-T1-GE3 requires external RCOMP and CCOMP on the COMP pin for loop stability. These components set crossover frequency and phase margin; Vishay recommends placing the compensation zero at ~1/5th of the LC pole. An automated calculator (Doc. 75760) is provided to determine optimal values based on inductor, output cap, and operating conditions.
SIC473ED-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:
- 5A
- 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
SIC473ED-T1-GE3 FAQ
1.How can I place an order for SIC473ED-T1-GE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIC473ED-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 SIC473ED-T1-GE3 reliable?
The price and inventory of SIC473ED-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 SIC473ED-T1-GE3 is usually 5 days.
3.What payment methods are accepted for SIC473ED-T1-GE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIC473ED-T1-GE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIC473ED-T1-GE3?
SIC473ED-T1-GE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIC473ED-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 SIC473ED-T1-GE3?
For technical support, including SIC473ED-T1-GE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIC473ED-T1-GE3 requirements.
6.How does Aetrix verify that SIC473ED-T1-GE3 is sourced from the original manufacturer or authorized distributors?
All SIC473ED-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 SIC473ED-T1-GE3 meets industry standards.
7.What is the process for return or replacement of SIC473ED-T1-GE3?
All SIC473ED-T1-GE3 units undergo pre-shipment inspection (PSI). If there is an issue with SIC473ED-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 SIC473ED-T1-GE3 part is unused and in its original packaging.
Return procedure for SIC473ED-T1-GE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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