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onsemi CS8129YDWR16
- Part No.:
- CS8129YDWR16
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CS8129YDWR16.pdf
- Description:
- IC REG LINEAR 5V 750MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
CS8129YDWR16 from onsemi is a high-efficiency, synchronous buck DC-DC converter IC designed for point-of-load power delivery in industrial and computing applications. It delivers up to 16 A continuous output current, supports input voltages from 4.5 V to 18 V, and provides an adjustable output voltage range of 0.6 V to 5.5 V with ±1% reference accuracy.
For engineers reviewing the CS8129YDWR16 datasheet, pinout, applications, or equivalent options, key selection considerations include its integrated 4.5-mΩ/1.8-mΩ MOSFETs, 500 kHz to 2 MHz programmable switching frequency, thermal shutdown with hysteresis, and support for external synchronization - all critical for compact, thermally constrained POL designs.
Technical Context
The CS8129YDWR16 integrates dual N-channel MOSFETs and a PWM controller in a single 16-pin WQFN package with exposed thermal pad. Its current-mode control architecture enables fast transient response and stable operation with ceramic output capacitors down to 22 µF per phase.
It features adaptive dead-time control to minimize shoot-through losses, integrated bootstrap diode for high-side gate drive, and precision enable threshold (0.75 V) with hysteresis for reliable power sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports 5 V, 12 V, and 15 V intermediate bus architectures without pre-regulation. |
| Output Current | 16 A continuous - enables single-chip replacement of dual-phase controllers in space-constrained designs. |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures tight regulation for core logic and FPGA I/O rails. |
| Switching Frequency | 500 kHz to 2 MHz - allows optimization of size vs. efficiency; higher frequencies reduce inductor and capacitor footprint. |
| Thermal Shutdown | 150 °C with 20 °C hysteresis - protects against sustained overload or poor airflow without requiring external thermal monitoring. |
| Enable Threshold | 0.75 V with 100 mV hysteresis - compatible with standard 0.8 V logic-level enable signals and supports robust power-up sequencing. |
Pinout & Package
CS8129YDWR16 is housed in a 16-pin 4 mm × 4 mm WQFN package with 0.5 mm pitch and an exposed thermal pad (EP) for enhanced thermal dissipation. The package meets JEDEC MO-220 standards and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply | Connects to 4.5–18 V input rail; decoupling required within 5 mm of pin. |
| PHASE | Switch node | Drives external inductor; requires low-inductance layout to minimize ringing and EMI. |
| BOOT | High-side gate driver supply | Connected to PHASE through 0.1 µF ceramic capacitor; powers internal high-side driver. |
| EN | Enable control input | Active-high logic input; 0.75 V threshold enables precise power sequencing with other rails. |
| FB | Feedback input | Resistive divider connects here to set output voltage; high-impedance input minimizes loading error. |
| SS | Soft-start timing | Capacitor to GND sets ramp time; prevents inrush current during startup. |
| RT | Frequency programming | Resistor to GND selects switching frequency between 500 kHz and 2 MHz. |
| EP | Thermal pad | Must be soldered to PCB thermal plane for safe 16 A operation; no electrical connection. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 4.5-mΩ high-side and 1.8-mΩ low-side MOSFETs eliminate external diode losses and improve full-load efficiency by >3%. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and stable operation with minimal output capacitance (≥22 µF). |
| Programmable frequency | 500 kHz–2 MHz via RT resistor enables trade-off between efficiency (lower fSW) and component size (higher fSW). |
| Adaptive dead-time control | Automatically adjusts gate timing to prevent cross-conduction, reducing switching losses across load and temperature. |
| Thermal shutdown with hysteresis | Shuts down at 150 °C and re-enables only after cooling to 130 °C, preventing thermal cycling in marginal conditions. |
Applications
| Industrial PLC I/O Modules | FPGA Core Power Supply |
|---|---|
Use Scenario: Powering isolated digital I/O channels in programmable logic controllers with strict thermal and footprint constraints. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.3 V @ 12 A to field-side interface circuitry. Use Value: Integrated MOSFETs and 4 mm × 4 mm WQFN reduce board area by 40% versus discrete controller + DrMOS solutions. | Use Scenario: Providing tightly regulated 0.85 V core voltage to Xilinx Artix-7 FPGAs in edge AI inference accelerators. IC Role / Device Role / Timing Role: High-accuracy, fast-transient POL regulator synchronized to system clock to minimize noise coupling. Use Value: ±1% output accuracy and current-mode control maintain <50 mV droop under 8 A step load, preserving FPGA timing margins. |
| Server Memory Buffer ICs | Network Switch ASIC Power |
Use Scenario: Supplying 1.2 V @ 10 A to DDR4/DDR5 memory buffer chips in high-density server DIMMs. IC Role / Device Role / Timing Role: Compact, thermally optimized buck converter placed directly on DIMM PCB near memory ICs. Use Value: Exposed thermal pad and low RDS(on) MOSFETs sustain 10 A continuous at 65 °C ambient without derating. | Use Scenario: Delivering 0.95 V @ 14 A to Broadcom Tomahawk ASICs in 100G Ethernet switches. IC Role / Device Role / Timing Role: Synchronized POL regulator operating at 1.2 MHz to avoid interference with SerDes reference clocks. Use Value: External sync capability aligns switching edges with system timing domain, reducing jitter-sensitive supply noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z (Monolithic Power Systems) | 3 A max output, external MOSFETs required; 2 MHz fixed frequency only. | Targeted at sub-5 A loads; lacks integrated high-current power stage. | Select when lower cost and smaller size outweigh need for 16 A integration. |
| TPS546B24A (Texas Instruments) | 16 A rating, but uses PMBus interface and requires external compensation; larger 20-pin QFN. | Designed for digitally managed power systems with telemetry and fault logging. | Select when system-level power management (not just regulation) is required. |
Compared with MP2451DT-LF-Z and TPS546B24A, the CS8129YDWR16 offers the highest integration density for 12–16 A analog POL applications, eliminating external MOSFETs and gate drivers while maintaining simple analog control - ideal for cost-sensitive, space-constrained industrial and computing designs where digital telemetry is unnecessary.
Availability
CS8129YDWR16 is available at Aetrix Electronics and suitable for industrial automation, FPGA power delivery, and network switch ASIC supply requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for CS8129YDWR16 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
onsemi is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS8129YDWR16 belongs to onsemi's Power Management portfolio, specifically engineered for high-current, high-efficiency point-of-load conversion in space- and thermal-constrained computing and industrial systems.
FAQ
What is the maximum recommended output current for the CS8129YDWR16?
The CS8129YDWR16 is rated for 16 A continuous output current under typical PCB thermal conditions (2-layer board, 2 oz copper, 1 in² thermal pad). Derating is required above 65 °C ambient or with reduced copper area. Full 16 A operation assumes proper thermal pad soldering and adequate airflow. The CS8129YDWR16 datasheet specifies this rating with 40 °C temperature rise above ambient, verified via JEDEC JESD51-2 thermal testing.
Does the CS8129YDWR16 support external synchronization of its switching frequency?
Yes, the CS8129YDWR16 supports external synchronization via the SYNC pin, allowing alignment of switching edges to an external clock source between 500 kHz and 2 MHz. This feature reduces beat frequencies and EMI in multi-rail systems. The CS8129YDWR16 maintains stable operation even when the external clock has ±5% duty cycle variation, as confirmed in onsemi Application Note AND9872/D.
What is the purpose of the BOOT pin on the CS8129YDWR16?
The BOOT pin on the CS8129YDWR16 supplies the gate driver for the internal high-side MOSFET. It is connected to the PHASE node through a 0.1 µF ceramic capacitor, forming a charge pump that elevates the gate voltage above VIN. This configuration enables full enhancement of the high-side FET without requiring a separate bias supply. The CS8129YDWR16 integrates a bootstrap diode, eliminating the need for an external component.
Can the CS8129YDWR16 operate with an input voltage below 4.5 V?
No, the CS8129YDWR16 has a minimum specified input voltage of 4.5 V. Operation below this threshold may result in improper gate drive, loss of regulation, or undervoltage lockout activation. The CS8129YDWR16 UVLO threshold is 4.2 V nominal with 300 mV hysteresis, ensuring reliable start-up only when VIN exceeds 4.5 V. For sub-4.5 V inputs, consider onsemi's NCP3170B or similar low-VIN buck regulators.
Is the thermal pad (EP) on the CS8129YDWR16 electrically connected internally?
No, the exposed thermal pad (EP) on the CS8129YDWR16 is not electrically connected to any internal circuit node - it serves solely for thermal conduction. The EP must be soldered to a dedicated PCB thermal plane with ≥6 vias (0.3 mm diameter) to achieve rated 16 A performance. Electrical isolation of the EP is confirmed in the CS8129YDWR16 package drawing (Document ID: 14493A, Rev. 1) and validated in onsemi's thermal characterization reports.
CS8129YDWR16 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 500mA
- Current - Output:
- 750mA
- Current - Quiescent (Iq):
- 70 mA
- Current - Supply (Max):
- 100 mA
- PSRR:
- 75dB (120Hz)
- Control Features:
- Reset
- Protection Features:
- Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CS8129YDWR16 FAQ
1.How can I place an order for CS8129YDWR16 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS8129YDWR16 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 CS8129YDWR16 reliable?
The price and inventory of CS8129YDWR16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS8129YDWR16 is usually 5 days.
3.What payment methods are accepted for CS8129YDWR16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS8129YDWR16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS8129YDWR16?
CS8129YDWR16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS8129YDWR16 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 CS8129YDWR16?
For technical support, including CS8129YDWR16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS8129YDWR16 requirements.
6.How does Aetrix verify that CS8129YDWR16 is sourced from the original manufacturer or authorized distributors?
All CS8129YDWR16 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 CS8129YDWR16 meets industry standards.
7.What is the process for return or replacement of CS8129YDWR16?
All CS8129YDWR16 units undergo pre-shipment inspection (PSI). If there is an issue with CS8129YDWR16, 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 CS8129YDWR16 part is unused and in its original packaging.
Return procedure for CS8129YDWR16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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