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onsemi CS5203A-1GDPR3
- Part No.:
- CS5203A-1GDPR3
- Manufacturer:
- onsemi
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
CS5203A-1GDPR3.pdf
- Description:
- IC REG LINEAR POS ADJ 3A D2PAK-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,597
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Product details
Overview
CS5203A-1GDPR3 from onsemi is an adjustable 3.0 A linear regulator with ±1.0% output voltage accuracy, 1.05 V dropout at full load, and thermal/overcurrent/SOA protection. It delivers stable 1.25–13 V output for microprocessor post-regulation and low-voltage embedded power rails where fast transient response and high current capability are critical.
For engineers reviewing the CS5203A-1GDPR3 datasheet, pinout, applications, or equivalent options, key selection criteria include its D2PAK-3 package thermal performance, adjustable feedback architecture requiring two external resistors, dropout behavior under 3 A load, and compatibility with tantalum output capacitors for stability in high-current DC/DC post-regulator designs.
Technical Context
The CS5203A-1GDPR3 implements a composite PNP-NPN pass transistor topology optimized for low dropout and high current delivery. Its internal bandgap reference (1.254 V typical) is buffered to the ADJ pin, enabling precise external resistor-based voltage setting across 1.25–13 V.
Protection circuitry includes thermal shutdown (150–180 °C trip), foldback overcurrent limiting (2.5–5.5 A depending on VIN–VOUT), and Safe Operating Area (SOA) control that dynamically reduces available output current as input-output differential increases - ensuring reliability under high-power dissipation conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.0 A continuous - supports high-current microprocessor core or FPGA I/O rail regulation without parallel devices. |
| Output Voltage Range | 1.25 V to 13 V adjustable - set via R1/R2 divider; enables flexible system-level voltage scaling. |
| Reference Voltage | 1.254 V ±1% - determines absolute output accuracy; error directly propagates into VOUT via resistor ratio. |
| Dropout Voltage | 1.05 V @ 3.0 A - defines minimum VIN–VOUT margin required to sustain regulation; critical for low-input systems. |
| Ripple Rejection | 85 dB @ 120 Hz - suppresses AC ripple from upstream switching converters, reducing need for additional filtering. |
| Quiescent Current | 10 mA max @ full load - contributes minimally to total system power loss during active operation. |
| Thermal Shutdown | 150–180 °C junction range - provides fail-safe protection during overload or inadequate heatsinking. |
Pinout & Package
D2PAK-3 surface-mount package (Case 418AB) with exposed tab electrically connected to VOUT for optimal thermal conduction to PCB copper pour or heatsink. Requires thermal compound if isolated mounting is used.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj) | Adjust reference node | Low-side terminal of internal 1.25 V bandgap; connects to R2 in divider; 50 µA typical bias current affects precision. |
| 2 (VOUT) | Regulated output | Power output terminal and electrically tied to metal tab - must be routed with low-impedance path to load and ground. |
| 3 (VIN) | Input supply | Unregulated DC input; requires ≥10 µF ceramic or tantalum bypass capacitor close to pin to ensure stability. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output architecture | Enables single BOM part to support multiple system voltages (1.25–13 V) using only two external resistors. |
| Low dropout voltage | 1.05 V @ 3 A allows operation with minimal headroom - e.g., 5 V input can regulate 3.3 V output at full current. |
| Composite PNP-NPN pass device | Delivers high current with lower saturation voltage than standard NPN-only regulators, improving efficiency. |
| Integrated SOA protection | Automatically derates output current as VIN–VOUT increases - prevents thermal runaway during wide-input applications. |
| Tantalum capacitor compatibility | Stable with 22 µF tantalum output capacitor; avoids instability risks associated with low-ESR ceramics in this topology. |
Applications
| Microprocessor Core Supply | FPGA I/O Rail Regulation |
|---|---|
|
Use Scenario: Providing clean, tightly regulated 1.2–1.8 V power to ARM Cortex-A series CPU cores with dynamic load steps up to 3 A. IC Role / Device Role / Timing Role: Primary post-regulator converting intermediate 3.3 V or 5 V bus to precise core voltage; handles µs-scale load transients. Use Value: 85 dB ripple rejection and fast loop response minimize voltage droop during instruction bursts, preventing timing violations. |
Use Scenario: Delivering stable 2.5 V or 3.3 V to FPGA bank I/Os with simultaneous switching noise up to 2 A peak. IC Role / Device Role / Timing Role: Local point-of-load regulator placed near FPGA package; decouples I/O switching noise from main power domain. Use Value: SOA protection prevents latch-up during hot-swap or partial reconfiguration events where VIN–VOUT differential may spike. |
| Industrial PLC Power Module | Medical Diagnostic Imaging Subsystem |
|
Use Scenario: Generating 5 V or 12 V auxiliary power for analog sensor signal conditioning and ADC reference circuits in harsh environments. IC Role / Device Role / Timing Role: Isolated secondary regulator fed from isolated DC/DC converter; supplies noise-sensitive analog stages. Use Value: ±1.0% initial accuracy and 0.5% temperature stability ensure consistent ADC full-scale calibration across –40°C to +70°C operating range. |
Use Scenario: Powering CCD/CMOS image sensor bias rails and timing controller logic in portable ultrasound units. IC Role / Device Role / Timing Role: Low-noise linear regulator supplying clock distribution ICs and sensor interface ASICs requiring <0.003% RMS noise. Use Value: 0.003% VOUT RMS noise (10 Hz–10 kHz) eliminates spurious artifacts in high-dynamic-range image capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1085CT-1.2 | Pin-compatible but higher 1.3 V dropout @ 3 A; ±1.5% reference accuracy; no SOA protection. | Lacks dynamic current derating under high VIN–VOUT - requires more conservative thermal design. | Choose when legacy LT1085 footprint reuse is mandatory and input headroom exceeds 1.3 V. |
| TPS7A8300RGRT | 3 A LDO with 0.8 V dropout @ 3 A; fixed/adjustable variants; integrated soft-start; 12 µA quiescent current. | Lower IQ and better PSRR (≥70 dB @ 1 MHz) but requires ceramic output caps and has tighter layout sensitivity. | Prefer for battery-powered systems needing ultra-low standby power and high-frequency noise suppression. |
Compared with LT1085CT-1.2 and TPS7A8300RGRT, the CS5203A-1GDPR3 offers superior SOA protection for wide-input industrial use, while maintaining proven stability with cost-effective tantalum capacitors - making it ideal for ruggedized, thermally constrained designs where reliability trumps ultra-low IQ.
Availability
CS5203A-1GDPR3 is available at Aetrix Electronics and suitable for microprocessor core supplies, FPGA I/O rail regulation, and industrial PLC power modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CS5203A-1GDPR3 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, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The CS5203A-1GDPR3 belongs to onsemi's high-current linear regulator product line, engineered specifically for post-regulation in space-constrained, thermally demanding applications where robust fault protection and predictable thermal behavior are essential.
FAQ
What output voltage range does the CS5203A-1GDPR3 support?
The CS5203A-1GDPR3 supports an adjustable output voltage range of 1.25 V to 13 V, set by an external resistor divider network connected to the ADJ pin. Its internal 1.254 V ±1% reference ensures tight accuracy across the full range, and the formula VOUT = 1.254 × (1 + R1/R2) + IADJ × R2 accounts for adjust pin bias current in precision designs.
Does the CS5203A-1GDPR3 require an output capacitor, and what type is recommended?
Yes, the CS5203A-1GDPR3 requires an output capacitor for loop stability. A 22 µF tantalum capacitor is the baseline recommendation per the datasheet; aluminum electrolytic types are acceptable but exhibit greater ESR variation at low temperatures. Ceramic capacitors are not recommended due to near-zero ESR, which can cause oscillation in this regulator's compensation scheme.
How does the Safe Operating Area (SOA) protection work in the CS5203A-1GDPR3?
The CS5203A-1GDPR3's SOA protection dynamically reduces maximum available output current as the input-output differential voltage increases - preventing thermal runaway during high-power-dissipation conditions. This is implemented via internal circuitry that monitors VIN–VOUT and adjusts current limit thresholds, unlike fixed-current-limit regulators that risk overheating when VIN is significantly higher than VOUT.
What is the thermal resistance profile of the CS5203A-1GDPR3 in its D2PAK-3 package?
The CS5203A-1GDPR3 in D2PAK-3 has a typical junction-to-case thermal resistance (RJC) of 1.6 °C/W. Total junction-to-ambient resistance (RJA) ranges from 10 to 50 °C/W depending on PCB copper area, heatsink attachment, and airflow - meaning effective thermal design requires direct thermal coupling of the VOUT-connected tab to ≥2 in² of 2-oz copper with thermal vias.
Can the CS5203A-1GDPR3 be used with remote voltage sensing?
No, the CS5203A-1GDPR3 is a three-terminal regulator without dedicated sense pins, so true remote load sensing is not supported. For best load regulation, connect the ADJ pin's R1 resistor directly to the VOUT pin (not the load), minimizing the impact of trace resistance. If remote sensing is essential, consider four-terminal regulators like the LM338 or newer programmable LDOs with dedicated SENSE inputs.
CS5203A-1GDPR3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 1.15V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 85dB (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
CS5203A-1GDPR3 FAQ
1.How can I place an order for CS5203A-1GDPR3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5203A-1GDPR3 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 CS5203A-1GDPR3 reliable?
The price and inventory of CS5203A-1GDPR3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5203A-1GDPR3 is usually 5 days.
3.What payment methods are accepted for CS5203A-1GDPR3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5203A-1GDPR3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5203A-1GDPR3?
CS5203A-1GDPR3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5203A-1GDPR3 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 CS5203A-1GDPR3?
For technical support, including CS5203A-1GDPR3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5203A-1GDPR3 requirements.
6.How does Aetrix verify that CS5203A-1GDPR3 is sourced from the original manufacturer or authorized distributors?
All CS5203A-1GDPR3 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 CS5203A-1GDPR3 meets industry standards.
7.What is the process for return or replacement of CS5203A-1GDPR3?
All CS5203A-1GDPR3 units undergo pre-shipment inspection (PSI). If there is an issue with CS5203A-1GDPR3, 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 CS5203A-1GDPR3 part is unused and in its original packaging.
Return procedure for CS5203A-1GDPR3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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