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onsemi CS5203A-2GDP3
- Part No.:
- CS5203A-2GDP3
- Manufacturer:
- onsemi
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
CS5203A-2GDP3.pdf
- Description:
- IC REG LINEAR FIXED LDO REG
- Quantity:
- Payment:
- Shipping:
Inventory:712
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Product details
Overview
CS5203A-2GDP3 from onsemi is a 3.0 A fixed-output linear regulator delivering 1.5 V with ±2.0% output accuracy, 1.05 V dropout at full load, and integrated thermal shutdown, overcurrent, and safe operating area (SOA) protection. It operates from −40°C to +70°C ambient and is used as a post-regulator for microprocessor core supplies and low-voltage embedded power rails.
For engineers reviewing the CS5203A-2GDP3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.5 V output stability under 3.0 A load, low-quiescent-current operation (≤10 mA), D2PAK-3 thermal performance (RJC = 1.6°C/W), and compatibility with tantalum output capacitors for transient response in high-current digital loads.
Technical Context
The CS5203A-2GDP3 implements a composite PNP-NPN pass transistor architecture optimized for low-dropout operation down to 1.05 V at 3.0 A while maintaining fast transient response. Its internal bandgap reference and error amplifier enable precise 1.5 V regulation across input differentials from 1.5 V to 6.0 V.
Protection is implemented via three independent circuits: SOA limiting reduces available current as VIN–VOUT increases; thermal shutdown activates at 150°C with 25°C hysteresis; and current limit thresholds vary with input voltage (3.2 A at VIN–VOUT = 3.0 V, 2.5 A at 15 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±2.0% - ensures stable core supply for low-voltage logic and analog subsystems without external feedback components. |
| Output Current | 3.0 A continuous - supports high-current FPGA I/O banks, DSP cores, and ASIC power domains requiring single-rail delivery. |
| Dropout Voltage | 1.05 V (typ) @ 3.0 A - enables operation from 2.55 V input, critical for battery-backed or multi-rail systems with tight voltage margins. |
| Quiescent Current | ≤10 mA @ full load - minimizes no-load power loss in always-on subsystems such as real-time clocks or sensor interfaces. |
| Ripple Rejection | 78 dB @ 120 Hz - suppresses switching noise from upstream DC/DC converters feeding the linear stage. |
| Thermal Shutdown | 150°C activation with 25°C hysteresis - prevents permanent damage during sustained overload or inadequate heatsinking. |
| Package | D2PAK-3 (Case 418AB) - exposes metal tab (VOUT) for direct heatsink mounting and achieves RJC = 1.6°C/W for efficient thermal transfer. |
Pinout & Package
D2PAK-3 package (Case 418AB) with exposed metal tab electrically connected to VOUT for low-thermal-resistance heatsinking. Pin 1 is GND, Pin 2 is VOUT (tab), Pin 3 is VIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference for internal error amplifier and protection circuitry | Must be connected to low-impedance system ground plane; serves as return path for adjust pin current in adjustable variants (not applicable to CS5203A-2). |
| 2 (VOUT) | Regulated 1.5 V output and thermal interface | Exposed metal tab is electrically tied to this pin; requires insulating pad if heatsink is grounded, and thermal compound for optimal RJA. |
| 3 (VIN) | Main input supply connection | Accepts up to 17 V input; must be decoupled with ≥10 µF input capacitor near pin to prevent instability and line transients. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.5 V output | Eliminates external resistor divider, reducing BOM count and layout sensitivity for dedicated core voltage rails. |
| SOA protection | Automatically derates output current as VIN–VOUT increases - prevents thermal runaway during wide-input-range operation (e.g., 5 V to 12 V input). |
| Tantalum-stable design | Guarantees stability with 22 µF tantalum output capacitor - avoids ceramic ESR-related oscillation risks common in high-current LDOs. |
| Low dropout at full load | 1.05 V dropout enables use with 2.55 V minimum input - supports legacy 3.3 V bus-powered systems stepping down to modern 1.5 V logic. |
| Pb-free packaging | D2PAK-3 suffix "GDP3" denotes RoHS-compliant lead-free finish - meets industrial and automotive environmental compliance requirements. |
Applications
| FPGA Core Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Supplying 1.5 V core voltage to Xilinx Spartan-6 or Intel Cyclone IV FPGA banks with dynamic current draw up to 2.8 A. IC Role / Device Role / Timing Role: Primary low-noise post-regulator following a 3.3 V buck converter, providing ripple-cleaned, thermally robust core rail. Use Value: 78 dB ripple rejection maintains signal integrity in high-speed LVDS I/O; SOA protection handles FPGA configuration surges without latch-up. |
Use Scenario: Powering isolated analog input channels (16-bit ADCs, op-amps) and digital isolators in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Local 1.5 V supply for precision analog front-end ICs requiring low thermal drift and immunity to field-induced noise. Use Value: ±2.0% output tolerance ensures ADC reference stability; 1.6°C/W RJC enables convection-only cooling in sealed enclosures. |
| Medical Sensor Hub | Automotive Body Control Module |
|
Use Scenario: Delivering regulated 1.5 V to ultra-low-power biosignal amplifiers (ECG, EEG) and Bluetooth LE SoCs in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-quiescent, low-noise linear regulator supplying mixed-signal SoC subsystems where switching noise would corrupt microvolt-level signals. Use Value: ≤10 mA quiescent current extends battery life; 0.003% VOUT RMS noise prevents baseline wander in biopotential measurements. |
Use Scenario: Providing 1.5 V bias to LIN transceivers, CAN PHY support logic, and EEPROM interfaces in 12 V automotive body electronics. IC Role / Device Role / Timing Role: Secondary linear regulator after main 5 V domain, powering communication peripherals requiring clean, fault-tolerant supply. Use Value: Thermal shutdown at 150°C protects against under-hood temperature excursions; 17 V absolute max input withstands load-dump transients. |
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 |
|---|---|---|---|
| LT1085CT-1.5#PBF | Pin-compatible but higher 1.3 V dropout at 3 A; ±1.5% initial accuracy; no SOA protection. | Lacks input-voltage-dependent current derating - less suitable for wide-input industrial supplies. | Choose when legacy LT1085 footprint reuse is mandatory and input differential >1.8 V is guaranteed. |
| TPS7A8300RGRT | Lower 0.6 V dropout, 2 A max, 20 µVRMS noise, but requires external compensation and 1.8 V min input. | Higher PSRR (≥75 dB to 1 MHz) but limited to 2 A - insufficient for 3 A FPGA core loads. | Prefer for noise-sensitive RF/analog rails where current demand ≤2 A and board space allows external components. |
Compared with LT1085CT-1.5#PBF, CS5203A-2GDP3 delivers lower dropout and integrated SOA protection; versus TPS7A8300RGRT, it trades ultra-low noise for higher current capability and simpler capacitor requirements - making CS5203A-2GDP3 optimal for cost-sensitive, high-current 1.5 V core regulation where tantalum stability and thermal robustness are prioritized.
Availability
CS5203A-2GDP3 is available at Aetrix Electronics and suitable for FPGA core power, industrial PLC I/O modules, medical sensor hubs, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for CS5203A-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 innovation for automotive, industrial, cloud, and IoT applications.
The CS5203A series was designed specifically for high-current, low-dropout post-regulation in microprocessor and FPGA power systems where thermal resilience and fault protection are non-negotiable.
FAQ
What is the maximum input voltage rating for CS5203A-2GDP3?
The CS5203A-2GDP3 has an absolute maximum supply voltage of 17 V. Operation above this level risks permanent damage. For reliable long-term use, keep VIN ≤ 15 V per datasheet test conditions, especially when combined with high ambient temperatures or marginal heatsinking.
Does CS5203A-2GDP3 require an external capacitor on the output pin?
Yes, CS5203A-2GDP3 requires a minimum 22 µF tantalum output capacitor for stability, as specified in the datasheet. Ceramic capacitors alone are not recommended due to near-zero ESR, which can cause oscillation. A parallel combination of tantalum and ceramic improves transient response without compromising stability.
Is the metal tab on the CS5203A-2GDP3 package electrically connected?
Yes, the exposed metal tab on the CS5203A-2GDP3 D2PAK-3 package is internally connected to Pin 2 (VOUT). This provides both electrical output connectivity and a low-thermal-resistance path to a heatsink. An insulating pad is required if the heatsink is grounded.
Can CS5203A-2GDP3 be used in automotive under-hood applications?
CS5203A-2GDP3 is rated for −40°C to +70°C ambient operation and features thermal shutdown at 150°C junction temperature. While it meets basic temperature requirements, it is not AEC-Q100 qualified. Use in under-hood environments requires careful thermal modeling and derating - consult onsemi's automotive qualification roadmap for certified alternatives.
What is the typical quiescent current of CS5203A-2GDP3 at light load?
The CS5203A-2GDP3 draws ≤10 mA quiescent current at full 3.0 A load, and typically 5.0 mA at 10 mA output current (VIN ≤ 9.0 V). This low IQ supports energy-efficient standby modes in battery-powered or always-on embedded systems without sacrificing regulation accuracy.
CS5203A-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):
- 1.15V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 78dB (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-2GDP3 FAQ
1.How can I place an order for CS5203A-2GDP3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5203A-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 CS5203A-2GDP3 reliable?
The price and inventory of CS5203A-2GDP3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5203A-2GDP3 is usually 5 days.
3.What payment methods are accepted for CS5203A-2GDP3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5203A-2GDP3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5203A-2GDP3?
CS5203A-2GDP3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5203A-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 CS5203A-2GDP3?
For technical support, including CS5203A-2GDP3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5203A-2GDP3 requirements.
6.How does Aetrix verify that CS5203A-2GDP3 is sourced from the original manufacturer or authorized distributors?
All CS5203A-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 CS5203A-2GDP3 meets industry standards.
7.What is the process for return or replacement of CS5203A-2GDP3?
All CS5203A-2GDP3 units undergo pre-shipment inspection (PSI). If there is an issue with CS5203A-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 CS5203A-2GDP3 part is unused and in its original packaging.
Return procedure for CS5203A-2GDP3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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