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onsemi CS5205-2GDPR3
- Part No.:
- CS5205-2GDPR3
- Manufacturer:
- onsemi
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
CS5205-2GDPR3.pdf
- Description:
- IC REG LINEAR 1.5V 5A D2PAK-3
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
CS5205-2GDPR3 from onsemi is a 5.0 A, 1.5 V fixed-output linear regulator with ±2.0% output voltage accuracy, 1.2 V dropout at full load, and integrated thermal shutdown, overcurrent, and safe operating area (SOA) protection. It is designed for active GTL bus termination on Intel-based motherboards requiring low-voltage operation and fast transient response.
For engineers reviewing the CS5205-2GDPR3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 5.0 A output current, D2PAK-3 surface-mount package compatibility, 1.5 V fixed regulation with Kelvin-sense–enabled load regulation, and SOA protection scaling with input-output differential voltage.
Technical Context
The CS5205-2GDPR3 employs a composite PNP-NPN output stage and requires an external 22 µF tantalum output capacitor for stability. Its loop design enables fast transient response critical for microprocessor GTL bus termination where load steps exceed 3 A/µs.
Protection logic dynamically reduces available output current as VIN–VOUT increases to maintain SOA compliance. Thermal shutdown activates at 150°C with 25°C hysteresis, and quiescent current remains ≤10 mA at 5.0 A load-enabling efficient high-current operation without auxiliary bias circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.50 V ±2.0% (1.47–1.53 V), trimmed at production for stable GTL termination reference |
| Max Output Current | 5.0 A continuous, supported by SOA-limited current foldback above 1.5 V VIN–VOUT |
| Dropout Voltage | 1.2 V typical at 5.0 A, enabling operation from 2.7 V input in 1.5 V systems |
| Quiescent Current | ≤10 mA at full load, minimizing no-load power loss in always-on motherboard rails |
| Ripple Rejection | 75 dB at 120 Hz, suppressing input ripple from upstream switching supplies |
| Thermal Shutdown | 150°C activation with 25°C hysteresis, preventing latch-up during sustained overload |
| Operating Temp | −40°C to +70°C ambient, validated for industrial motherboard environments |
Pinout & Package
The CS5205-2GDPR3 is packaged in the D2PAK-3 (DP suffix, Case 418AB) surface-mount outline, with the exposed tab electrically connected to VOUT for low-impedance thermal and power return path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for error amplifier and internal bias; must be low-inductance connection to minimize noise coupling |
| 2 | VOUT | Regulated 1.5 V output; tab is internally bonded to this pin-requires thermal pad soldering to PCB ground plane |
| 3 | VIN | Input supply (up to 17 V); placed adjacent to VOUT pin to reduce loop inductance in high-di/dt GTL termination |
Key Features
| Feature | Design Value |
|---|---|
| Composite PNP-NPN Output Stage | Enables 5.0 A output with 1.2 V dropout while maintaining SOA integrity across temperature |
| Kelvin-Sense–Enabled Load Regulation | 0.40% max load regulation (10 mA–5.0 A) when measured 6.35 mm from output pin per datasheet Note 4 |
| SOA Protection with VIN–VOUT Scaling | Automatically reduces max output current as input-output differential rises-prevents second breakdown |
| Low RMS Output Noise | 0.003 %VOUT (10 Hz–10 kHz), critical for noise-sensitive GTL signaling integrity |
| Stable with Tantalum Output Capacitors | Guaranteed stability with ≥22 µF tantalum COUT; avoids ceramic ESR-related oscillation risks |
Applications
| Intel GTL Bus Termination | Core Voltage Support for Legacy CPUs |
|---|---|
Use Scenario: Active termination of GTL-signaled address/data buses on Pentium II/III-era server and desktop motherboards. IC Role / Device Role / Timing Role: Provides precise 1.5 V DC termination reference with sub-100 ns transient response to absorb signal reflections. Use Value: Eliminates need for discrete resistor networks, reducing BOM count and improving impedance matching accuracy vs. passive solutions. | Use Scenario: Delivering stable 1.5 V core power to early-generation Intel CPUs with tight voltage tolerance requirements. IC Role / Device Role / Timing Role: Low-noise linear regulation supplying CPU I/O and cache logic rails during dynamic load transients. Use Value: 75 dB ripple rejection suppresses switching noise from upstream DC-DC converters, preventing timing jitter in synchronous logic paths. |
| High-Current Point-of-Load Regulator | Industrial Backplane Power Interface |
Use Scenario: Local 1.5 V regulation for FPGA I/O banks or ASIC SerDes interfaces requiring clean, high-current supply. IC Role / Device Role / Timing Role: Fast-response linear regulator placed adjacent to load to minimize trace inductance and voltage droop. Use Value: 1.2 V dropout allows use with 2.7 V intermediate bus, simplifying power architecture vs. higher-dropout alternatives. | Use Scenario: GTL-compatible termination on industrial backplanes supporting hot-plug peripheral modules. IC Role / Device Role / Timing Role: Robust termination device with thermal shutdown and SOA protection for uncontrolled environmental conditions. Use Value: 150°C thermal shutdown with 25°C hysteresis ensures reliable recovery after temporary overloads in fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM1085IT-1.5/NOPB | 3.0 A max output, 1.3 V dropout at 3 A, TO-220 only, no SOA protection | Lacks GTL-specific transient response tuning and SOA foldback; suitable only for lower-current, non-bus-termination uses | Select only if output current ≤3 A and thermal fault robustness is secondary to cost |
| TPS7A8300RGRT | 3.0 A, 1.5 V fixed, 0.5 V dropout, QFN-20, no SOA protection, 10 µA IQ | Optimized for ultra-low dropout and quiescent current-not for high-current GTL termination with fast di/dt | Prefer for battery-powered or low-power 1.5 V rails; not recommended for motherboard GTL bus loads >2 A |
Compared with LM1085IT-1.5/NOPB and TPS7A8300RGRT, the CS5205-2GDPR3 uniquely delivers 5.0 A at 1.5 V with SOA protection scaled to VIN–VOUT, making it the only option qualified for Intel GTL bus termination where simultaneous high current and dynamic fault resilience are mandatory.
Availability
CS5205-2GDPR3 is available at Aetrix Electronics and suitable for Intel motherboard design, GTL bus termination, and high-current 1.5 V point-of-load regulation requiring stable component supply and long-term industrial availability.
Supply support for CS5205-2GDPR3 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, and IoT applications.
The CS5205-2GDPR3 belongs to onsemi's high-current linear regulator product line, engineered specifically for GTL and GTL+ bus termination in x86 server and desktop platforms requiring precision 1.5 V regulation with robust fault handling.
FAQ
What is the maximum input voltage rating for the CS5205-2GDPR3?
The CS5205-2GDPR3 has a maximum supply voltage (VCC) rating of 17 V, as specified in the Absolute Maximum Ratings table. This allows operation from intermediate rails up to 17 V while maintaining regulation at 1.5 V output. Exceeding 17 V risks permanent damage even with thermal protection active, and the device is not rated for automotive load-dump transients.
Does the CS5205-2GDPR3 require an external output capacitor, and what type is recommended?
Yes, the CS5205-2GDPR3 requires an external output capacitor for loop stability. A minimum 22 µF tantalum capacitor is recommended, as aluminum electrolytic or ceramic types with near-zero ESR may cause instability. The datasheet explicitly warns against using film or ceramic capacitors alone due to potential oscillation, and confirms stability with standard tantalum devices.
How does the Safe Operating Area (SOA) protection function in the CS5205-2GDPR3?
The CS5205-2GDPR3 implements SOA protection by dynamically reducing the maximum allowable output current as the input-output differential voltage increases. This prevents second breakdown in the composite PNP-NPN output transistor. Unlike simple current limiting, SOA protection scales with power dissipation-ensuring safe operation across varying input voltages without requiring external sensing circuitry.
Is the CS5205-2GDPR3 pin-compatible with other regulators in the CS5205 family?
Yes, the CS5205-2GDPR3 shares identical pinout (GND-VOUT-VIN) and D2PAK-3 package with the CS5205-2GDP3 and CS5205-2GT3 variants. All three share the same electrical characteristics and thermal performance; the only differences are packaging format (tape-and-reel vs. rail) and ordering part number-making them functionally interchangeable in layout.
What is the thermal resistance junction-to-case (RJC) for the CS5205-2GDPR3?
The CS5205-2GDPR3 has a typical junction-to-case thermal resistance (RJC) of 1.6°C/W, as published in the Package Thermal Data table. This value applies to both TO-220-3 and D2PAK-3 packages. Effective heatsinking requires attention to case-to-heatsink resistance (RCS), especially since the D2PAK-3 tab is electrically connected to VOUT and must be isolated if the PCB ground plane is not at VOUT potential.
CS5205-2GDPR3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 5A
- Current - Output:
- 5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-3
CS5205-2GDPR3 FAQ
1.How can I place an order for CS5205-2GDPR3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5205-2GDPR3 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 CS5205-2GDPR3 reliable?
The price and inventory of CS5205-2GDPR3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5205-2GDPR3 is usually 5 days.
3.What payment methods are accepted for CS5205-2GDPR3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5205-2GDPR3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5205-2GDPR3?
CS5205-2GDPR3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5205-2GDPR3 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 CS5205-2GDPR3?
For technical support, including CS5205-2GDPR3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5205-2GDPR3 requirements.
6.How does Aetrix verify that CS5205-2GDPR3 is sourced from the original manufacturer or authorized distributors?
All CS5205-2GDPR3 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 CS5205-2GDPR3 meets industry standards.
7.What is the process for return or replacement of CS5205-2GDPR3?
All CS5205-2GDPR3 units undergo pre-shipment inspection (PSI). If there is an issue with CS5205-2GDPR3, 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 CS5205-2GDPR3 part is unused and in its original packaging.
Return procedure for CS5205-2GDPR3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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