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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi CS5205A-1GDP3

Name: CS5205A-1GDP3
Brand: onsemi
SKU: CS5205A-1GDP3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CS5205A-1GDP3

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-263-4, D2PAK (3 Leads + Tab), TO-263AA

Datasheet:: CS5205A-1GDP3.pdf

Description:: IC REG LINEAR ADJ LDO REGULATOR

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Product details

Overview

CS5205A-1GDP3 from onsemi is a 5.0 A adjustable linear regulator with ±1% output voltage accuracy, 1.15 V dropout at full load, and thermal/overcurrent/SOA protection. It operates from 1.25 V to 13 V output range using two external resistors and serves as a post-regulator or microprocessor supply in low-voltage, high-transient-response systems.

For engineers reviewing the CS5205A-1GDP3 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 5 A, thermal shutdown threshold (150°C), adjustable reference voltage (1.254 V typ), and D2PAK-3 package thermal resistance (R_ΘJC = 1.6°C/W).

Technical Context

The CS5205A-1GDP3 uses a composite PNP-NPN output stage optimized for low dropout and fast transient response. Its error amplifier maintains a precise 1.25 V reference between VOUT and ADJ pins, enabling stable adjustable output via external resistor divider.

Protection circuitry includes thermal shutdown (150°C activation, 25°C hysteresis), current limiting (5.5–8.5 A depending on VIN−VOUT), and Safe Operating Area (SOA) control that dynamically reduces max output current as input-output differential increases.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	5.0 A continuous - supports high-current microprocessor core rails and FPGA I/O banks.
Dropout Voltage	1.15 V @ 5.0 A - enables operation with minimal VIN−VOUT margin, critical for low-voltage systems.
Reference Voltage	1.254 V (±1%) - sets output accuracy baseline; determines VOUT = 1.25 × (1 + R1/R2) + I_ADJ×R2.
Ripple Rejection	82 dB @ 120 Hz - suppresses AC line noise and switching regulator ripple in hybrid power architectures.
Thermal Shutdown	150°C junction activation - protects against sustained overload or inadequate heatsinking in enclosed industrial enclosures.
Quiescent Current	10 mA @ full load - minimizes no-load power loss in always-on subsystems without compromising regulation.
Load Regulation	0.4% max (10 mA–5 A) - ensures stable voltage under dynamic CPU load transitions without external compensation.

Pinout & Package

The CS5205A-1GDP3 is housed in a surface-mount D2PAK-3 (Case 418AB) package with exposed tab electrically connected to VOUT for optimal thermal conduction to PCB copper pour or heatsink.

Pin/Terminal	Circuit Role	Design Meaning
1 (Adj)	Adjust reference node	Low-side reference terminal; sinks 50–100 μA; connects to resistor divider midpoint for output voltage setting.
2 (VOUT)	Regulated output	Power output terminal and thermally conductive package tab; requires Kelvin sensing at pin for ±1% accuracy.
3 (VIN)	Unregulated input	High-side input terminal; accepts up to 17 V; must maintain ≥1.15 V above VOUT at 5 A for regulation.

Key Features

Feature	Design Value
Composite PNP-NPN output stage	Enables 1.15 V dropout at 5 A while maintaining SOA-limited current foldback under high VIN−VOUT conditions.
Integrated SOA protection	Dynamically scales current limit based on VIN−VOUT differential, preventing thermal runaway during wide-input-range operation.
Low-adjust-pin current (50 μA typ)	Minimizes error in VOUT calculation when using high-value R1/R2 dividers for precision 12 V outputs.
Tantalum-stable compensation	Guarantees stability with 22 μF tantalum COUT; avoids ceramic capacitor ESR-related oscillation in high-current designs.
Thermal shutdown hysteresis (25°C)	Prevents cycling near trip point during intermittent overload, improving reliability in fanless embedded systems.

Applications

Microprocessor Core Supply	FPGA I/O Bank Regulator
Use Scenario: Powering ARM Cortex-A series SoCs requiring 1.2 V @ 4.5 A with tight transient tolerance. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise DC after a buck converter; handles di/dt transients up to 2 A/μs. Use Value: 82 dB ripple rejection and fast loop response prevent logic errors during burst-mode CPU execution.	Use Scenario: Supplying 3.3 V to Xilinx Artix-7 FPGA I/O banks with simultaneous switching noise (SSN) constraints. IC Role / Device Role / Timing Role: Low-dropout linear regulator providing noise-isolated rail decoupled from noisy digital supply domains. Use Value: ±1% output accuracy ensures I/O timing margins meet setup/hold requirements across temperature.
Industrial PLC Analog Front-End	Medical Imaging Power Subsystem
Use Scenario: Generating 5.0 V for precision ADC reference buffers and op-amp signal chains in DIN-rail controllers. IC Role / Device Role / Timing Role: Low-noise analog supply rail; referenced to system ground with Kelvin-sense layout to minimize IR drop. Use Value: 0.003% RMS output noise and 0.08% load regulation preserve 16-bit measurement integrity.	Use Scenario: Providing 12 V bias to CCD sensor arrays in portable ultrasound units with battery-backed operation. IC Role / Device Role / Timing Role: Adjustable high-current rail supporting variable sensor gain settings; thermally isolated from digital processing section. Use Value: SOA protection prevents latch-up during cold-start battery voltage sag, ensuring safe boot sequence.

Microprocessor Core Supply

FPGA I/O Bank Regulator

Use Scenario: Powering ARM Cortex-A series SoCs requiring 1.2 V @ 4.5 A with tight transient tolerance.

IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise DC after a buck converter; handles di/dt transients up to 2 A/μs.

Use Value: 82 dB ripple rejection and fast loop response prevent logic errors during burst-mode CPU execution.

Use Scenario: Supplying 3.3 V to Xilinx Artix-7 FPGA I/O banks with simultaneous switching noise (SSN) constraints.

IC Role / Device Role / Timing Role: Low-dropout linear regulator providing noise-isolated rail decoupled from noisy digital supply domains.

Use Value: ±1% output accuracy ensures I/O timing margins meet setup/hold requirements across temperature.

Industrial PLC Analog Front-End

Medical Imaging Power Subsystem

Use Scenario: Generating 5.0 V for precision ADC reference buffers and op-amp signal chains in DIN-rail controllers.

IC Role / Device Role / Timing Role: Low-noise analog supply rail; referenced to system ground with Kelvin-sense layout to minimize IR drop.

Use Value: 0.003% RMS output noise and 0.08% load regulation preserve 16-bit measurement integrity.

Use Scenario: Providing 12 V bias to CCD sensor arrays in portable ultrasound units with battery-backed operation.

IC Role / Device Role / Timing Role: Adjustable high-current rail supporting variable sensor gain settings; thermally isolated from digital processing section.

Use Value: SOA protection prevents latch-up during cold-start battery voltage sag, ensuring safe boot sequence.

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable high-current linear regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT1084CP-5#PBF	Pin-compatible but higher dropout (1.3 V @ 5 A); 1.25 V reference (±1.5%); no SOA protection.	Lacks dynamic current foldback; requires external thermal monitoring for high VIN−VOUT operation.	Select when legacy LT1084 footprint reuse is mandatory and dropout margin >1.3 V is available.
TL783CKTTR	Higher max input (125 V); lower output current (750 mA); 1.25 V reference (±1%); no thermal shutdown.	Designed for high-input industrial supplies, not high-current low-dropout applications.	Select only for ultra-high-VIN scenarios where 5 A output is not required.

Compared with LT1084CP-5#PBF and TL783CKTTR, the CS5205A-1GDP3 uniquely combines 5 A output, 1.15 V dropout, integrated SOA, and thermal shutdown in a single D2PAK-3 package-enabling compact, self-protected designs where input voltage margin is constrained.

Availability

CS5205A-1GDP3 is available at Aetrix Electronics and suitable for microprocessor core supplies, FPGA I/O regulators, industrial PLC analog front-ends, and medical imaging power subsystems requiring stable component supply and long-term manufacturability.

Supply support for CS5205A-1GDP3 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, with leadership in power management, analog, and sensor technologies.

The CS5205A-1GDP3 belongs to onsemi's high-current linear regulator product line, engineered specifically for post-regulation in compute-intensive embedded systems where low dropout, fast transient response, and robust fault protection are mandatory.

FAQ

What is the maximum input voltage rating for the CS5205A-1GDP3?

The CS5205A-1GDP3 has an absolute maximum supply voltage of 17 V. Exceeding this value risks permanent damage to the internal pass transistor and protection circuitry. Designers must ensure VIN remains ≤17 V under all operating conditions, including input surge and transient events, to maintain reliability of the CS5205A-1GDP3.

Does the CS5205A-1GDP3 require an external output capacitor, and what type is recommended?

Yes, the CS5205A-1GDP3 requires an external output capacitor for stability. A 22 μF tantalum capacitor is specified as minimum; aluminum electrolytic or polymer types are acceptable. Ceramic capacitors are not recommended due to near-zero ESR, which can cause instability. The CS5205A-1GDP3's compensation is optimized for tantalum's ESR profile.

How does the Safe Operating Area (SOA) protection function in the CS5205A-1GDP3?

The CS5205A-1GDP3's SOA protection dynamically reduces the maximum allowable output current as the VIN−VOUT differential increases, preventing thermal runaway under high-power-dissipation conditions. This is implemented via internal circuitry that monitors both current and voltage stress simultaneously-not a simple current limit-ensuring safe operation across its full 1.25–13 V output range.

Can the CS5205A-1GDP3 be used without a heatsink in a 5 A application?

No. At 5 A with typical VIN−VOUT = 3 V, power dissipation exceeds 15 W. Even with the D2PAK-3's R_ΘJC = 1.6°C/W, junction temperature will exceed 150°C without a heatsink. A properly sized heatsink (R_ΘSA ≤ 3.5°C/W) and thermal interface material are mandatory for continuous 5 A operation of the CS5205A-1GDP3.

Is the CS5205A-1GDP3 pin-compatible with other regulators, and which ones?

Yes, the CS5205A-1GDP3 is pin-compatible with the LT1084 family in D2PAK-3 and TO-220-3 packages. However, it delivers lower dropout (1.15 V vs. 1.3 V) and adds SOA protection not present in LT1084 devices. This makes the CS5205A-1GDP3 a functional upgrade-not just a drop-in replacement-for LT1084-based designs needing improved efficiency and protection.

CS5205A-1GDP3 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:: Adjustable

Number of Regulators:: 1

Voltage - Input (Max):: 17V

Voltage - Output (Min/Fixed):: 1.25V

Voltage - Output (Max):: 13V

Voltage Dropout (Max):: 1.25V @ 5A

Current - Output:: 5A

Current - Quiescent (Iq):: 6 mA

Current - Supply (Max):: -

PSRR:: 82dB (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

CS5205A-1GDP3 FAQ

1.How can I place an order for CS5205A-1GDP3 through Aetrix?

Please submit a Request for Quotation (RFQ) for CS5205A-1GDP3 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 CS5205A-1GDP3 reliable?

The price and inventory of CS5205A-1GDP3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5205A-1GDP3 is usually 5 days.

3.What payment methods are accepted for CS5205A-1GDP3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5205A-1GDP3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CS5205A-1GDP3?

CS5205A-1GDP3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CS5205A-1GDP3 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 CS5205A-1GDP3?

For technical support, including CS5205A-1GDP3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5205A-1GDP3 requirements.

6.How does Aetrix verify that CS5205A-1GDP3 is sourced from the original manufacturer or authorized distributors?

All CS5205A-1GDP3 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 CS5205A-1GDP3 meets industry standards.

7.What is the process for return or replacement of CS5205A-1GDP3?

All CS5205A-1GDP3 units undergo pre-shipment inspection (PSI). If there is an issue with CS5205A-1GDP3, 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 CS5205A-1GDP3 part is unused and in its original packaging.

Return procedure for CS5205A-1GDP3:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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