My Inquiry
My Account
onsemi CS5205-2GDP3
- Part No.:
- CS5205-2GDP3
- Manufacturer:
- onsemi
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
CS5205-2GDP3.pdf
- Description:
- IC REG LINEAR FIXED LDO REG
- Quantity:
- Payment:
- Shipping:
Inventory:2,350
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CS5205-2GDP3 from onsemi is a 5.0 A, 1.5 V fixed-output linear regulator with ±2.0% output 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 requiring low-voltage operation and fast transient response.
For engineers reviewing the CS5205-2GDP3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 5.0 A output at 1.5 V, D2PAK-3 package thermal performance (RJC = 1.6 °C/W), SOA-limited current foldback under high VIN–VOUT differentials, and mandatory tantalum or aluminum electrolytic output capacitance for stability.
Technical Context
The CS5205-2GDP3 employs a composite PNP-NPN pass transistor architecture optimized for low-dropout, high-current GTL termination. Its loop design achieves fast transient response via internal compensation tuned for ≥22 µF tantalum output capacitors.
Protection logic dynamically reduces maximum output current as VIN–VOUT increases to enforce SOA limits; thermal shutdown activates at 150 °C with 25 °C hysteresis. Quiescent current remains ≤10 mA at 5.0 A load, enabling efficient operation in thermally constrained motherboard layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.50 V ±2.0% (1.47–1.53 V); trimmed at production for GTL-2 compliance. |
| Max Output Current | 5.0 A continuous; derated by SOA protection above 1.0 V VIN–VOUT differential. |
| Dropout Voltage | 1.2 V @ 5.0 A; enables operation from 2.7 V input when delivering 1.5 V output. |
| Quiescent Current | ≤10 mA @ 5.0 A load; minimizes no-load power loss in always-on motherboard rails. |
| Ripple Rejection | 75 dB @ 120 Hz, 5.0 A; suppresses input ripple from switching DC/DC stages upstream. |
| Thermal Shutdown | 150 °C activation with 25 °C hysteresis; prevents permanent damage during sustained overload. |
| Package Thermal RJC | 1.6 °C/W (D2PAK-3); requires thermal compound and heatsink for >2 W dissipation. |
Pinout & Package
D2PAK-3 surface-mount package (Case 418AB) with exposed tab electrically connected to VOUT for low-inductance output path and thermal conduction to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for error amplifier and protection circuitry; must be low-impedance connection to system ground plane. |
| 2 | VOUT | Regulated 1.5 V output; tab is internally bonded to this pin-requires soldered thermal pad to PCB for heat dissipation. |
| 3 | VIN | Input supply (up to 17 V); feeds pass transistor and bias circuitry; requires ≥10 µF ceramic bypass near pin. |
Key Features
| Feature | Design Value |
|---|---|
| SOA Protection | Current foldback scales inversely with VIN–VOUT to prevent destructive power dissipation in pass transistor. |
| Fast Transient Response | Stabilized for ≥22 µF tantalum output capacitor; supports microprocessor load steps without violating GTL-2 voltage tolerance. |
| Low Dropout | 1.2 V @ 5.0 A enables use with 3.3 V intermediate bus while maintaining 1.5 V GTL termination. |
| Integrated Protection | Single-die integration of thermal shutdown, overcurrent, and SOA limits eliminates external fault management circuitry. |
| Fixed Output Trim | ±2.0% output voltage tolerance achieved via laser trimming-no external resistors required for 1.5 V setting. |
Applications
| Intel GTL Bus Termination | Low-Voltage Microprocessor Core Supply |
|---|---|
|
Use Scenario: Active termination of GTL signaling lines on Intel Pentium II/III-era server and desktop motherboards. IC Role / Device Role / Timing Role: Provides precise 1.5 V termination voltage with fast current sourcing/sinking to maintain signal integrity during high-speed data transitions. Use Value: Eliminates need for discrete resistor networks and improves noise margin by matching GTL driver impedance within ±2.0% voltage tolerance. |
Use Scenario: Secondary core supply for early-generation microprocessors requiring stable 1.5 V at up to 5 A with minimal voltage droop. IC Role / Device Role / Timing Role: Delivers regulated 1.5 V with <1.2 V dropout and 75 dB ripple rejection to support clean clock and logic domains. Use Value: Enables direct regulation from 3.3 V intermediate bus, reducing component count versus two-stage conversion while meeting transient load demands. |
| Industrial Backplane Power | Embedded Control System Rail |
|
Use Scenario: Local point-of-load regulation for GTL-compatible control logic on industrial backplanes with wide input voltage variation. IC Role / Device Role / Timing Role: Maintains 1.5 V rail despite input fluctuations from 4.5 V to 17 V, using SOA protection to survive hot-swap transients. Use Value: Guarantees bus termination stability across temperature (−40°C to +70°C ambient) and input voltage extremes without external supervision. |
Use Scenario: Dedicated 1.5 V supply for FPGA I/O banks or ASIC configuration logic in space-constrained embedded controllers. IC Role / Device Role / Timing Role: Supplies low-noise 1.5 V with 0.003 %/VOUT RMS noise to prevent timing jitter in high-speed digital interfaces. Use Value: D2PAK-3 package allows high-current routing directly to BGA pads while providing thermal path through exposed VOUT tab. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM1085IMPX-1.5/NOPB | 3.0 A max output, 1.5 V fixed, TO-263 package; no SOA protection or GTL-specific trim. | Lacks GTL-2 compliance and SOA foldback-suitable only for general-purpose 1.5 V loads ≤3 A. | Select only if output current ≤3 A and GTL termination is not required; verify thermal design for D2PAK-equivalent RJA. |
| LT1585ACT-1.5#PBF | 4.5 A max output, 1.5 V fixed, TO-220 package; includes thermal shutdown but no SOA or load-regulation optimization for GTL. | Higher dropout (1.3 V @ 4.5 A) and no ±2.0% GTL-grade trim-less suitable for tight-tolerance motherboard rails. | Acceptable for non-GTL 1.5 V systems where 4.5 A suffices and board layout accommodates TO-220 mounting. |
Compared with LM1085IMPX-1.5/NOPB and LT1585ACT-1.5#PBF, the CS5205-2GDP3 delivers higher current (5.0 A), tighter output tolerance (±2.0%), and GTL-specific SOA protection-making it uniquely suited for Intel motherboard termination where precision, current, and fault resilience are co-dependent requirements.
Availability
CS5205-2GDP3 is available at Aetrix Electronics and suitable for Intel GTL bus termination, low-voltage microprocessor core supplies, and industrial backplane power applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for CS5205-2GDP3 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and intelligent power systems.
The CS5205-2GDP3 belongs to onsemi's high-current linear regulator product line, engineered specifically for GTL bus termination and low-voltage, high-transient-load applications in Intel-based computing platforms.
FAQ
What is the maximum input voltage rating for the CS5205-2GDP3?
The CS5205-2GDP3 has an absolute maximum supply voltage (VCC) of 17 V. Operation beyond this rating risks permanent damage. For reliable long-term use in GTL termination applications, input voltage should remain ≤10 V per the electrical characteristics test conditions specified in the datasheet.
Does the CS5205-2GDP3 require an external output capacitor, and what type is recommended?
Yes, the CS5205-2GDP3 requires an external output capacitor for loop stability. A minimum 22 µF tantalum capacitor is recommended; aluminum electrolytic types are acceptable but exhibit greater ESR variation at low temperatures. Ceramic or film capacitors are not recommended due to near-zero ESR causing instability.
How does SOA protection function in the CS5205-2GDP3 during high input-to-output differentials?
In the CS5205-2GDP3, SOA protection reduces the maximum allowable output current as the VIN–VOUT differential increases-preventing destructive power dissipation in the pass transistor. This dynamic current foldback ensures safe operation even at 17 V input, provided load current is scaled per the SOA curve in the datasheet.
Is the D2PAK-3 package of the CS5205-2GDP3 electrically isolated, and how is thermal management handled?
No-the D2PAK-3 package of the CS5205-2GDP3 has its exposed tab internally connected to VOUT, so electrical isolation requires insulating hardware. Thermal management relies on soldering the tab to a large copper pour and applying thermal compound; RJC is 1.6 °C/W, and RJA varies from 10–50 °C/W depending on PCB copper area and airflow.
Can the CS5205-2GDP3 be used as a drop-in replacement for the TO-220 version CS5205-2GT3?
No-while both share identical electrical specifications, the CS5205-2GDP3 (D2PAK-3) and CS5205-2GT3 (TO-220-3) have incompatible footprints and thermal mounting requirements. PCB redesign is required to switch between them; neither is a mechanical or layout-compatible substitute.
CS5205-2GDP3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Bulk
- Product Status:
- Active
- 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
CS5205-2GDP3 FAQ
1.How can I place an order for CS5205-2GDP3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5205-2GDP3 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 CS5205-2GDP3 reliable?
The price and inventory of CS5205-2GDP3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5205-2GDP3 is usually 5 days.
3.What payment methods are accepted for CS5205-2GDP3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5205-2GDP3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5205-2GDP3?
CS5205-2GDP3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5205-2GDP3 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 CS5205-2GDP3?
For technical support, including CS5205-2GDP3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5205-2GDP3 requirements.
6.How does Aetrix verify that CS5205-2GDP3 is sourced from the original manufacturer or authorized distributors?
All CS5205-2GDP3 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 CS5205-2GDP3 meets industry standards.
7.What is the process for return or replacement of CS5205-2GDP3?
All CS5205-2GDP3 units undergo pre-shipment inspection (PSI). If there is an issue with CS5205-2GDP3, 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 CS5205-2GDP3 part is unused and in its original packaging.
Return procedure for CS5205-2GDP3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CS5205-2GDP3 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
