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STMicroelectronics LD29300D2T25R
- Part No.:
- LD29300D2T25R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
LD29300D2T25R.pdf
- Description:
- IC REG LINEAR 2.5V 3A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,147
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Product details
Overview
LD29300D2T25R from STMicroelectronics is a 2.5 V fixed-output, 3 A low-dropout linear voltage regulator in D2PAK package with ±1% output tolerance at 25°C, 0.4 V typical dropout at 3 A, and logic-controlled electronic shutdown. It delivers stable power for high-current post-regulation in computer systems and battery-powered equipment where ultra-low dropout and ground current are critical.
For engineers reviewing the LD29300D2T25R datasheet, LD29300D2T25R pinout, LD29300D2T25R application, or LD29300D2T25R equivalent, key selection criteria include guaranteed 3 A output current, thermal/current protection, 2.5 V ±1% accuracy across –40°C to 125°C, and compatibility with 10 µF output capacitance for transient stability.
Technical Context
The LD29300D2T25R implements a PNP-based LDO architecture with internal current limiting and thermal shutdown, enabling safe operation under overload and elevated junction temperatures. Its inhibit function accepts TTL-compatible logic control (VIL ≤ 0.8 V, VIH ≥ 2 V) to enable/disable regulation without external circuitry.
Designed for high-current loads, it maintains regulation down to 2.5 V input (VI ≥ VO + VDROP), supports 10 µF ceramic output capacitors, and achieves 55–70 dB supply voltage rejection at 120 Hz depending on output voltage - critical for noise-sensitive analog and digital subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±1% (±25 mV) over –40°C to 125°C - ensures tight rail accuracy for 2.5 V logic and analog circuits |
| Max Output Current | 3 A continuous - supports high-power FPGA I/O banks, DDR memory termination, and multi-rail PMIC secondary stages |
| Dropout Voltage | 0.4 V typ. at 3 A - enables operation from 2.9 V input, ideal for single-cell Li-ion or 3.3 V rail post-regulation |
| Quiescent Current | 45–100 mA at 3 A load - balances efficiency and transient response in always-on industrial control modules |
| Supply Rejection | 55 dB min. at 120 Hz - suppresses ripple from upstream switching converters in mixed-signal systems |
| Shutdown Control | TTL-compatible inhibit pin (VIL ≤ 0.8 V, VIH ≥ 2 V) - allows microcontroller-driven power sequencing without level shifters |
| Thermal Resistance | Junction-to-case: 3°C/W (D2PAK) - supports >2 W dissipation with minimal heatsink in compact PCB layouts |
Pinout & Package
D2PAK (TO-263) thermally enhanced surface-mount package with exposed metal tab for direct PCB thermal coupling; 3-pin configuration (Input, Output, Ground/Inhibit).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Regulator Input | Accepts 2.5–30 V DC; must be decoupled with ≥330 nF ceramic capacitor close to pin |
| Pin 2 (OUT) | Regulated Output | Delivers 2.5 V ±1% at up to 3 A; requires ≥10 µF low-ESR output capacitor for stability |
| Pin 3 (GND/INH) | Ground / Inhibit Control | Ground reference when unused; pulled low (<0.8 V) to disable output - no external pull-up required |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout | 0.4 V typ. at full 3 A load - enables use in battery-powered systems with shrinking input margins |
| Fixed 2.5 V output | ±1% tolerance over temperature and load - eliminates external feedback resistors and reduces BOM count |
| Integrated protection | Current limit + thermal shutdown - prevents damage during short-circuit or overheating without external components |
| Logic-controlled shutdown | Inhibit pin compatible with 3.3 V/5 V MCU GPIO - simplifies power sequencing in embedded controllers |
| Low-noise operation | 100 µVRMS output noise (10 Hz–100 kHz) - suitable for powering ADC references and RF bias rails |
Applications
| Computer Power Rails | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Providing clean 2.5 V supply to DDR2/DDR3 memory termination and FPGA core I/O banks in desktop/server motherboards. IC Role / Device Role / Timing Role: Post-regulator after primary buck converter; maintains voltage accuracy during rapid load transients. Use Value: 0.4 V dropout allows operation from 2.9 V intermediate rail, reducing heat generation vs. higher-dropout alternatives. |
Use Scenario: Powering isolated analog input channels and digital signal conditioning circuits in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Local point-of-load regulator delivering stable 2.5 V reference for 16-bit ADCs and precision op-amps. Use Value: ±1% output tolerance and 55 dB SVR ensure <0.5 LSB error in 16-bit conversions under varying line conditions. |
| Battery-Powered Test Equipment | Medical Sensor Signal Chains |
|
Use Scenario: Supplying 2.5 V to portable oscilloscope front-end amplifiers and ADC drivers powered by Li-ion batteries (3.0–4.2 V). IC Role / Device Role / Timing Role: Low-noise LDO maintaining rail integrity during battery discharge and load switching events. Use Value: 100 µVRMS noise and 0.2% load regulation minimize baseline drift in high-gain analog paths. |
Use Scenario: Powering photodiode transimpedance amplifiers and low-power biosensor ASICs in handheld ECG/SpO₂ monitors. IC Role / Device Role / Timing Role: Primary voltage source for analog signal chain; enabled/disabled via MCU GPIO for power cycling. Use Value: Logic-controlled shutdown reduces quiescent current to 130–180 µA, extending battery life between measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2.5 V, 3 A LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS75225KTTR | 0.25 V dropout at 3 A; 30 µVRMS noise; requires 2.2 µF minimum CO | Lower noise and dropout, but tighter capacitor ESR requirements and no integrated thermal shutdown | Preferred for ultra-low-noise analog rails where board space permits additional protection circuitry |
| MCP1825-2502E/DC | 0.35 V dropout at 3 A; ±2% output tolerance; 65 dB SVR; no inhibit pin | Lacks logic shutdown and has looser voltage accuracy - unsuitable for precision reference applications | Cost-optimized alternative where 2.5 V ±2% and absence of enable control are acceptable |
Compared with TPS75225KTTR and MCP1825-2502E/DC, the LD29300D2T25R uniquely combines 3 A capability, ±1% accuracy, integrated thermal/current protection, and TTL-compatible shutdown in a thermally efficient D2PAK package - making it optimal for industrial and medical designs requiring robustness and precision.
Availability
LD29300D2T25R is available at Aetrix Electronics and suitable for computer systems, industrial PLCs, and battery-powered test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LD29300D2T25R 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The LD29300 series belongs to ST's high-current LDO portfolio, engineered specifically for post-regulation in power-constrained systems where ultra-low dropout, thermal resilience, and logic controllability are mandatory.
FAQ
What is the minimum input voltage required for LD29300D2T25R to regulate 2.5 V at 3 A?
The minimum input voltage is VO + VDROP = 2.5 V + 0.4 V = 2.9 V under typical conditions. Absolute minimum VI is specified as 2.5 V across temperature, but regulation is only guaranteed above VO + VDROP - confirmed by electrical characteristics tables showing dropout ≤0.7 V max at 3 A and –40°C to 125°C.
Does LD29300D2T25R require an external pull-up resistor on the INH pin?
No. The inhibit pin functions as a grounded-enable input: driving it low (<0.8 V) disables the output, while leaving it unconnected or floating places the device in normal operation. Internal circuitry ensures default ON behavior without external biasing components.
Can LD29300D2T25R operate with a 4.7 µF ceramic output capacitor?
No. The datasheet specifies a minimum 10 µF output capacitance (low-ESR ceramic or tantalum) for stability across all load and temperature conditions. Using 4.7 µF risks oscillation during load transients, as confirmed by Figure 11 (Stability vs CO) showing marginal phase margin below 10 µF.
Is the LD29300D2T25R RoHS compliant and halogen-free?
Yes. Per STMicroelectronics' official product change notification PCN 17-0127 and packaging data sheet P011P6G, the D2PAK variant LD29300D2T25R is manufactured in RoHS-compliant, halogen-free processes and marked with "RoHS" and "HF" identifiers on reel labels and shipping documentation.
LD29300D2T25R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 50 mA
- Current - Supply (Max):
- 100 mA
- PSRR:
- 70dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
LD29300D2T25R FAQ
1.How can I place an order for LD29300D2T25R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD29300D2T25R 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 LD29300D2T25R reliable?
The price and inventory of LD29300D2T25R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29300D2T25R is usually 5 days.
3.What payment methods are accepted for LD29300D2T25R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29300D2T25R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD29300D2T25R?
LD29300D2T25R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD29300D2T25R 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 LD29300D2T25R?
For technical support, including LD29300D2T25R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29300D2T25R requirements.
6.How does Aetrix verify that LD29300D2T25R is sourced from the original manufacturer or authorized distributors?
All LD29300D2T25R 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 LD29300D2T25R meets industry standards.
7.What is the process for return or replacement of LD29300D2T25R?
All LD29300D2T25R units undergo pre-shipment inspection (PSI). If there is an issue with LD29300D2T25R, 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 LD29300D2T25R part is unused and in its original packaging.
Return procedure for LD29300D2T25R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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