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onsemi CS5205-2GT3
- Part No.:
- CS5205-2GT3
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
CS5205-2GT3.pdf
- Description:
- IC REG LINEAR 1.5V 5A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,887
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Product details
Overview
CS5205-2GT3 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 serves as active GTL bus termination on Intel-based motherboards, delivering fast transient response and low-noise regulation for microprocessor core power.
For engineers reviewing the CS5205-2GT3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 5.0 A output at 1.5 V, TO-220-3 package thermal performance (RJC = 1.6 °C/W), ripple rejection of 75 dB at 120 Hz, and Kelvin-sense–compatible load regulation stability under dynamic CPU load conditions.
Technical Context
The CS5205-2GT3 employs a composite PNP-NPN output stage optimized for low-dropout operation down to 1.0 V at reduced loads, with loop compensation designed for stability using ≥22 µF tantalum output capacitance. Its SOA protection dynamically reduces available output current as VIN−VOUT increases, preventing thermal runaway during high-differential-voltage transients.
Thermal shutdown activates at 150 °C with 25 °C hysteresis, and quiescent current remains ≤10 mA at full 5.0 A load. The device requires no external sense lines but achieves best load regulation when mounted with minimized conductor parasitic resistance between VOUT pin and load ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.50 V ±2.0% (1.47–1.53 V); trimmed at factory for GTL bus termination accuracy |
| Maximum Output Current | 5.0 A continuous; limited by SOA protection above 1.5 V input-output differential |
| Dropout Voltage | 1.2 V typical at 5.0 A; enables operation with VIN as low as 2.7 V for 1.5 V output |
| Ripple Rejection | 75 dB at 120 Hz; suppresses switching noise from upstream DC/DC converters |
| Quiescent Current | ≤10 mA at full load; minimizes no-load power loss in always-on motherboard rails |
| Thermal Shutdown Threshold | 150 °C junction temperature; latches off until cooldown to 125 °C (25 °C hysteresis) |
| RMS Output Noise | 0.003 %/VOUT (10 Hz–10 kHz); critical for low-noise microprocessor core supply |
Pinout & Package
CS5205-2GT3 is supplied in the TO-220-3 package (Case 221A), with the metal tab electrically connected to VOUT for direct heatsink mounting and thermal conduction. Pin 1 is GND, Pin 2 is VOUT (tab), and Pin 3 is VIN - a non-reversible configuration requiring correct PCB layout to avoid short-circuit risk.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Low-impedance return path for error amplifier and protection circuitry; must be routed separately from high-current load ground to avoid regulation error |
| 2 (VOUT) | Regulated output | Electrically tied to metal tab; provides direct thermal path to heatsink and defines output voltage for GTL bus termination |
| 3 (VIN) | Input supply | Accepts up to 17 V input; dropout behavior begins below 2.7 V for 1.5 V output; requires ≥10 µF input capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Active GTL bus termination | Delivers precise 1.5 V @ 5.0 A to match Intel GTL specification, eliminating need for discrete resistor networks |
| SOA protection with voltage-dependent current limiting | Reduces max output current as VIN−VOUT rises-e.g., limits to ~5.5 A at 3.0 V differential, ~1.0 A at 9.0 V differential |
| Stability with standard tantalum output caps | Guaranteed stable with ≥22 µF tantalum (ESR 0.1–1 Ω); avoids ceramic capacitor instability risks in high-current applications |
| Low thermal resistance junction-to-case | RJC = 1.6 °C/W enables compact heatsink design; 50 °C/W RJA typical on FR-4 with 1-in² copper pad |
| High PSRR at low frequencies | 75 dB ripple rejection at 120 Hz supports clean power delivery even with noisy AC/DC front-end supplies |
Applications
| Intel GTL Bus Termination | Microprocessor Core Power |
|---|---|
Use Scenario: Termination of GTL-signaled address/data buses on Pentium II/III-era server and desktop motherboards. IC Role / Device Role / Timing Role: Provides active 1.5 V termination voltage with fast transient response to maintain signal integrity during high-speed bus switching. Use Value: Replaces 10+ discrete resistors and bypass caps, reducing BOM count and improving termination accuracy vs. passive networks. |
Use Scenario: Primary 1.5 V supply for early-generation CPU cores requiring low-noise, high-current regulation. IC Role / Device Role / Timing Role: Delivers tightly regulated 1.5 V at up to 5.0 A with <0.40% load regulation, supporting rapid load steps during instruction execution. Use Value: Enables stable core voltage under dynamic 0→5 A load transients without external LDO post-regulation. |
| Industrial Control Backplane Power | Legacy Embedded System Rail |
Use Scenario: Local 1.5 V rail generation on industrial backplanes with wide input voltage range (5–15 V). IC Role / Device Role / Timing Role: Serves as robust, thermally protected point-of-load regulator tolerant of input ripple and ambient temperature swings (−40 to +70 °C). Use Value: Integrated SOA and thermal shutdown eliminate need for external current-limiting or thermal monitoring circuitry. |
Use Scenario: Replacement power solution for aging embedded systems using obsolete 1.5 V logic families (e.g., GTL+, SSTL-2). IC Role / Device Role / Timing Role: Supplies stable 1.5 V with ±2.0% tolerance and 0.003 %/VOUT noise for timing-critical I/O interfaces. Use Value: Maintains compatibility with legacy 1.5 V signaling standards while offering modern protection and thermal performance. |
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, 1.5 V fixed, dropout 1.3 V @ 3 A; no SOA protection; RJC = 3.0 °C/W | Lacks dynamic SOA current limiting; unsuitable for high-dV/dt GTL bus termination | Select only for lower-current (≤3 A), non-GTL applications where SOA protection is not required |
| LT1528CT-1.5 | 3.0 A max output, 1.5 V fixed, dropout 0.6 V @ 3 A; includes thermal shutdown but no overcurrent or SOA protection | Better dropout performance but missing fault protection needed for motherboard-level reliability | Prefer for ultra-low-dropout needs in non-termination roles; avoid where bus fault currents may exceed 3 A |
Compared with LM1085IT-1.5/NOPB and LT1528CT-1.5, the CS5205-2GT3 uniquely combines 5.0 A capability, GTL-specific 1.5 V accuracy, and comprehensive SOA/overcurrent/thermal protection-making it the only validated choice for Intel GTL bus termination in production motherboards.
Availability
CS5205-2GT3 is available at Aetrix Electronics and suitable for Intel motherboard design, microprocessor core power delivery, and industrial backplane termination requiring stable component supply across extended lifecycle programs.
Supply support for CS5205-2GT3 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 specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The CS5205-2GT3 belongs to onsemi's high-current linear regulator product line, engineered specifically for GTL bus termination and low-voltage microprocessor power in Intel platform designs from the late 1990s through early 2000s.
FAQ
What is the maximum input voltage rating for the CS5205-2GT3?
The CS5205-2GT3 has an absolute maximum supply voltage (VCC) of 17 V. Operation above this level risks permanent damage. For reliable long-term use, input voltage should remain ≤10 V per electrical characteristics testing conditions, especially when delivering full 5.0 A output current.
Does the CS5205-2GT3 require an external output capacitor, and what type is recommended?
Yes, the CS5205-2GT3 requires an external output capacitor for stability. A minimum 22 µF tantalum capacitor is specified, with higher values improving transient response. Aluminum electrolytic capacitors are acceptable but exhibit greater ESR variation at low temperatures; ceramic capacitors are not recommended due to near-zero ESR causing potential instability.
How does the Safe Operating Area (SOA) protection function in the CS5205-2GT3?
The CS5205-2GT3 SOA protection dynamically reduces maximum allowable output current as the input-output voltage differential increases-for example, limiting to ~1.0 A at 9.0 V differential versus 5.5 A at 3.0 V differential. This prevents thermal runaway during high-VIN, low-VOUT conditions without requiring external current-sense circuitry.
Is the metal tab on the CS5205-2GT3 TO-220-3 package electrically isolated?
No-the metal tab on the CS5205-2GT3 TO-220-3 package is internally connected to Pin 2 (VOUT). Electrical isolation from the heatsink is required if the heatsink is grounded or at a different potential. Insulating hardware and thermal compound must be used to maintain safety and thermal performance.
What is the thermal resistance junction-to-case (RJC) for the CS5205-2GT3 in TO-220-3 package?
The CS5205-2GT3 has a typical junction-to-case thermal resistance (RJC) of 1.6 °C/W in the TO-220-3 package. This value is critical for heatsink sizing; combined with case-to-heatsink (RCS) and heatsink-to-ambient (RSA) resistances, it determines total RJA and maximum sustainable power dissipation.
CS5205-2GT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-3
CS5205-2GT3 FAQ
1.How can I place an order for CS5205-2GT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5205-2GT3 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 CS5205-2GT3 reliable?
The price and inventory of CS5205-2GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5205-2GT3 is usually 5 days.
3.What payment methods are accepted for CS5205-2GT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5205-2GT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5205-2GT3?
CS5205-2GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5205-2GT3 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 CS5205-2GT3?
For technical support, including CS5205-2GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5205-2GT3 requirements.
6.How does Aetrix verify that CS5205-2GT3 is sourced from the original manufacturer or authorized distributors?
All CS5205-2GT3 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 CS5205-2GT3 meets industry standards.
7.What is the process for return or replacement of CS5205-2GT3?
All CS5205-2GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CS5205-2GT3, 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 CS5205-2GT3 part is unused and in its original packaging.
Return procedure for CS5205-2GT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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