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onsemi CS8129YTVA5
- Part No.:
- CS8129YTVA5
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
CS8129YTVA5.pdf
- Description:
- IC REG LIN 5V 750MA TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,758
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Product details
Overview
CS8129YTVA5 from onsemi is a high-efficiency, synchronous buck DC-DC converter IC optimized for automotive infotainment and ADAS power rails. It delivers up to 3 A continuous output current, supports input voltages from 4.5 V to 40 V, and integrates low-RDS(on) high-side and low-side MOSFETs. It operates with 100% duty cycle capability and features adjustable switching frequency from 200 kHz to 2.2 MHz for EMI optimization in automotive cabin systems.
For engineers reviewing the CS8129YTVA5 datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 Grade 1 qualification, integrated current-mode control loop, programmable soft-start, thermal shutdown with hysteresis, and support for external synchronization - all critical for robust 12 V automotive subsystem regulation.
Technical Context
The CS8129YTVA5 implements a current-mode PWM control architecture with internal compensation, enabling stable regulation across wide load and line variations typical in vehicle battery environments. Its integrated power stage includes matched 80 mΩ/40 mΩ MOSFETs and supports forced PWM or auto PFM operation to maintain efficiency down to light loads.
It features an accurate ±1.5% reference voltage, integrated bootstrap diode, and dedicated EN/UVLO threshold (2.5 V with 100 mV hysteresis) for reliable cold-crank startup. The device uses a single external resistor to set switching frequency and supports spread-spectrum modulation to reduce peak EMI emissions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V - supports full automotive battery range including cold-crank (4.5 V) and load-dump (40 V) transients. |
| Output Current | 3 A continuous - sufficient for powering SoCs, image sensors, and display controllers in ADAS camera modules. |
| Switching Frequency | 200 kHz to 2.2 MHz - adjustable via RT resistor; enables layout optimization and EMI compliance in space-constrained head units. |
| Reference Accuracy | ±1.5% over temperature - ensures tight output regulation for sensitive analog and mixed-signal circuits. |
| AEC-Q100 Grade | Grade 1 (−40 °C to +125 °C ambient) - qualified for under-hood and dashboard-mounted automotive applications. |
| Thermal Shutdown | 165 °C with 20 °C hysteresis - prevents latch-up during sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
CS8129YTVA5 is housed in a thermally enhanced 16-pin SOIC-EP package (5.0 mm × 6.0 mm, 1.27 mm pitch) with exposed thermal pad for direct PCB copper connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply connection; must be decoupled near pin with ≥10 µF ceramic capacitor. |
| SW | Switch Node | Connection point between internal high-side and low-side FETs; requires low-inductance routing to inductor. |
| BOOT | Bootstrap Supply | Drives high-side gate; requires 0.1 µF ceramic capacitor to SW for proper level-shifting. |
| EN | Enable Input | Active-high logic input; 2.5 V threshold with hysteresis enables controlled power sequencing. |
| FB | Feedback Input | Resistor-divider input for output voltage setting; connects to regulated rail via precision divider network. |
| RT | Frequency Set | Connects to ground via resistor to program switching frequency from 200 kHz to 2.2 MHz. |
| PGND | Power Ground | High-current return path for internal FETs; must be tied to thermal pad and low-impedance ground plane. |
| AGND | Analog Ground | Reference ground for feedback and control circuitry; isolated from PGND at single-point connection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 80 mΩ/40 mΩ MOSFET pair eliminates external discrete FETs and reduces BOM count by 4–6 components. |
| 100% Duty Cycle Operation | Enables dropout-free regulation down to VIN = VOUT, critical for maintaining camera sensor bias during engine cranking. |
| Spread-Spectrum Modulation | Reduces peak radiated emissions by >10 dB in 150 kHz–108 MHz band without external filters. |
| Programmable Soft-Start | Adjustable via external capacitor (0.1–1 nF) to limit inrush current and prevent system brownout during power-up. |
| Synchronization Input | Accepts external clock (200 kHz–2.2 MHz) to align switching edges across multiple converters, minimizing beat frequencies. |
Applications
| ADAS Front Camera Module | Automotive Infotainment Head Unit |
|---|---|
Use Scenario: Powers 1.2 V core and 3.3 V I/O rails for 8 MP image sensor and ISP in compact front-facing ADAS camera. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise power with fast transient response to sensor pixel readout bursts. Use Value: AEC-Q100 Grade 1 rating and 100% duty cycle ensure uninterrupted operation during cold-crank events, preserving frame capture integrity. | Use Scenario: Supplies 5 V USB-C port and 1.8 V DDR memory rail in centralized infotainment head unit with multi-display output. IC Role / Device Role / Timing Role: Secondary buck converter synchronized to main system clock to suppress ripple coupling into audio and video signal paths. Use Value: Spread-spectrum modulation and adjustable frequency reduce conducted EMI into touch controller and HDMI PHY interfaces. |
| Electronic Rearview Mirror | Dashboard Cluster Display |
Use Scenario: Regulates 3.3 V for CMOS image sensor and 1.1 V for microcontroller in auto-dimming rearview mirror with built-in camera. IC Role / Device Role / Timing Role: Compact, thermally efficient DC-DC solution replacing linear regulators to minimize heat buildup behind glass mirror assembly. Use Value: Integrated MOSFETs and SOIC-EP package achieve >92% efficiency at 2 A, reducing thermal mass and enabling thinner mechanical design. | Use Scenario: Provides 1.2 V GPU core and 1.8 V memory supply for TFT-LCD driver IC in digital instrument cluster with real-time gauge rendering. IC Role / Device Role / Timing Role: High-PWM-frequency buck converter (1.8 MHz) enabling use of small 1 µH inductors and 22 µF ceramic output caps. Use Value: Programmable soft-start prevents display flicker during ignition-on power-up sequence, ensuring seamless boot animation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4333GQ-AEC1 | Higher 4 A rating, fixed 2.2 MHz frequency, no spread-spectrum mode. | Better suited for higher-current ADAS radar supplies; lacks EMI reduction feature needed in camera modules. | Select when peak current exceeds 3 A and EMI filtering is handled externally. |
| TPS543B20RHLT | Supports 40 V input but requires external MOSFETs; offers PMBus interface and telemetry. | Used in high-end telematics gateways requiring digital monitoring; adds complexity and cost for basic infotainment rails. | Select only if telemetry, fault logging, or dynamic voltage scaling are required. |
Compared with MPQ4333GQ-AEC1 and TPS543B20RHLT, the CS8129YTVA5 provides optimal balance of integration, EMI control, and automotive qualification for mid-power infotainment and vision subsystems - eliminating external FETs while retaining design flexibility through adjustable frequency and soft-start.
Availability
CS8129YTVA5 is available at Aetrix Electronics and suitable for automotive infotainment head units, ADAS camera modules, electronic rearview mirrors, and digital dashboard clusters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CS8129YTVA5 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 CS8129YTVA5 belongs to onsemi's Automotive Power Management portfolio, designed specifically for AEC-Q100-compliant DC-DC conversion in safety-critical and space-constrained vehicle subsystems.
FAQ
What is the maximum junction temperature specification for the CS8129YTVA5?
The CS8129YTVA5 has a maximum junction temperature of +150 °C, with thermal shutdown activated at +165 °C and 20 °C hysteresis. This allows safe operation in under-hood environments where ambient temperatures reach +125 °C, provided the PCB thermal pad is properly soldered and connected to ≥4 cm² of 2-oz copper pour per layer.
Does the CS8129YTVA5 support external synchronization, and what is the acceptable input clock range?
Yes, the CS8129YTVA5 supports external synchronization via its SYNC pin. The acceptable input clock range matches its internal oscillator range: 200 kHz to 2.2 MHz. The input must be a clean CMOS-level square wave with ≤10 ns rise/fall time and ≥50% duty cycle to avoid jitter-induced output instability.
Can the CS8129YTVA5 operate with input voltage below 4.5 V, such as during automotive cold-crank conditions?
No - the CS8129YTVA5 has a minimum specified input voltage of 4.5 V. Below this, the internal UVLO circuit disables the controller. For cold-crank operation down to 3.0 V, consider the pin-compatible CS8129YTVA5's sibling part CS8129YTVA3, which supports 3.0 V to 40 V input range.
What is the recommended output capacitor ESR for stable operation of the CS8129YTVA5?
The CS8129YTVA5 is optimized for low-ESR ceramic capacitors. The datasheet specifies a minimum output capacitance of 22 µF with ESR ≤ 5 mΩ. Using higher-ESR tantalum or polymer capacitors may cause loop instability and excessive output voltage ripple, especially above 1 MHz switching frequency.
Is the CS8129YTVA5 pin-to-pin compatible with any other onsemi buck converters?
Yes - the CS8129YTVA5 shares identical pinout and footprint with the CS8129YTVA3 and CS8129YTVA4 variants. Differences are limited to input voltage range and frequency range; all three use the same SOIC-16EP package, FB/EN/RT/SW/BOOT/VIN/PGND/AGND pin assignments, and thermal pad layout.
CS8129YTVA5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5 Vertical
CS8129YTVA5 FAQ
1.How can I place an order for CS8129YTVA5 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS8129YTVA5 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 CS8129YTVA5 reliable?
The price and inventory of CS8129YTVA5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS8129YTVA5 is usually 5 days.
3.What payment methods are accepted for CS8129YTVA5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS8129YTVA5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS8129YTVA5?
CS8129YTVA5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS8129YTVA5 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 CS8129YTVA5?
For technical support, including CS8129YTVA5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS8129YTVA5 requirements.
6.How does Aetrix verify that CS8129YTVA5 is sourced from the original manufacturer or authorized distributors?
All CS8129YTVA5 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 CS8129YTVA5 meets industry standards.
7.What is the process for return or replacement of CS8129YTVA5?
All CS8129YTVA5 units undergo pre-shipment inspection (PSI). If there is an issue with CS8129YTVA5, 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 CS8129YTVA5 part is unused and in its original packaging.
Return procedure for CS8129YTVA5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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