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STMicroelectronics LD29150DT25R
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- Part No.:
- LD29150DT25R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LD29150DT25R.pdf
- Description:
- IC REG LINEAR 2.5V 1.5A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:282
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Product details
Overview
LD29150DT25R from STMicroelectronics is a fixed-output 2.5 V, 1.5 A low-dropout linear regulator in PPAK package, designed for post-regulation in switching power supplies and battery-powered systems where ultra-low dropout (0.4 V typ. at 1.5 A) and low ground current are critical. It integrates thermal shutdown, current limiting, and logic-controlled electronic shutdown.
For engineers reviewing the LD29150DT25R datasheet, LD29150DT25R pinout, LD29150DT25R application, or LD29150DT25R equivalent, key selection criteria include dropout voltage at full load, output accuracy (±1% over –40 °C to +125 °C), quiescent current behavior under varying load and input voltage, and thermal resistance (RthJC = 8 °C/W) for PCB-level thermal design.
Technical Context
The LD29150DT25R employs a PMOS pass transistor architecture enabling sub-0.5 V dropout at 1.5 A while maintaining tight output regulation (±1% initial accuracy, ±2% over temperature and line/load). Its internal reference is trimmed during production to ensure stability across industrial temperature range.
It features an inhibit (INH) control terminal supporting logic-level shutdown (VIL ≤ 0.8 V, VIH ≥ 2 V), reducing quiescent current to 130–180 µA in OFF mode. The device uses external input (CI = 330 nF) and output (CO = 10 µF) capacitors for stability and transient response per ST's recommended application circuit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 2.5 V ±1% at 25 °C; ±2% over –40 °C to +125 °C ensures stable core logic supply under thermal stress. |
| Dropout voltage | 0.4 V typical at 1.5 A load; enables operation with only 2.9 V input for 2.5 V output - critical for Li-ion (3.0 V min) or multi-rail systems. |
| Max output current | Guaranteed 1.5 A continuous; internally current-limited to protect against overload without external components. |
| Quiescent current | 15–40 mA at 0.75 A load; rises to 30–80 mA at 1.5 A - optimized for efficiency in high-current LDO applications. |
| Thermal shutdown | Triggers at 150 °C junction temperature; combined with RthJC = 8 °C/W, allows ~12 W dissipation with proper heatsinking. |
| Supply rejection | 55–70 dB at 120 Hz (VI = 4.5 V ±1 V); suppresses ripple from upstream DC/DC converters in hybrid power architectures. |
| Noise voltage | 100 µVRMS (10 Hz–100 kHz); suitable for noise-sensitive analog rails like ADC references or RF bias supplies. |
Pinout & Package
LD29150DT25R is housed in a thermally enhanced PPAK (Power Package) surface-mount package with exposed thermal pad, optimized for high-power density and low junction-to-case thermal resistance (RthJC = 8 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 3.5 V to 13 V DC; internal protection activates above 14 V to prevent damage. |
| OUT | Regulated output | Delivers stable 2.5 V to load; requires 10 µF ceramic output capacitor for stability and transient response. |
| GND | Ground reference | Common return path for input, output, and control circuits; must be low-impedance for noise immunity. |
| INH | Inhibit control input | Active-high logic enable: <0.8 V disables regulator (Iq ≈ 150 µA), >2 V enables normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 0.4 V typ. at 1.5 A enables use with marginal input margins - e.g., 3.0 V Li-ion battery powering 2.5 V FPGA core rail. |
| High accuracy output | ±1% initial tolerance tightened to ±2% over full temperature and load range - reduces need for system-level calibration. |
| Logic-controlled shutdown | INH pin supports microcontroller-driven power sequencing; draws only 130–180 µA in OFF state for ultra-low standby power. |
| Integrated protection | Current limit and thermal shutdown operate autonomously - eliminates need for external fault-handling circuitry. |
| Low noise performance | 100 µVRMS broadband noise supports clean analog/RF subsystems without additional filtering stages. |
Applications
| Industrial PLC I/O Modules | Portable Medical Sensors |
|---|---|
|
Use Scenario: Powering isolated analog front-end (AFE) and microcontroller cores in DIN-rail mounted PLC modules with wide ambient temperature range. IC Role / Device Role: Primary 2.5 V LDO for precision ADC reference and MCU VCC, fed from 5 V intermediate bus. Use Value: 0.4 V dropout allows reliable operation down to 2.9 V input during brownout events; ±2% output stability maintains measurement accuracy across –40 °C to +75 °C. |
Use Scenario: Battery-powered wearable ECG sensor requiring quiet, stable 2.5 V supply for op-amp signal conditioning and SAR ADC. IC Role / Device Role: Low-noise post-regulator after buck converter, delivering regulated 2.5 V to analog signal chain. Use Value: 100 µVRMS noise floor prevents degradation of 16-bit ADC ENOB; INH pin enables sleep-mode current reduction to <200 µA. |
| Set-Top Box Power Management | Automotive Infotainment Core Rail |
|
Use Scenario: Providing clean 2.5 V supply to video decoder SoC core in consumer set-top boxes with cost-sensitive thermal design. IC Role / Device Role: High-current LDO replacing discrete solutions for SoC core voltage, placed near processor on compact PCB. Use Value: RthJC = 8 °C/W enables direct thermal pad soldering to inner copper layer - achieves <10 °C rise at 1.5 A without external heatsink. |
Use Scenario: Regulating 2.5 V for automotive-grade microcontroller core in infotainment head unit operating from 12 V battery via pre-regulator. IC Role / Device Role: Secondary LDO supplying safety-critical MCU core, with shutdown controlled by vehicle ECU wake-up signal. Use Value: Thermal shutdown at 150 °C and guaranteed operation to +125 °C junction temperature meets AEC-Q100 Grade 2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6215B252MR-G | 2.5 V fixed, 1 A max, 0.25 V dropout at 1 A; no INH pin; SOT-23-5 package. | Limited to lower current; lacks enable/shutdown control; smaller footprint but higher RthJA (~200 °C/W). | Select when board space is constrained and 1 A suffices; avoid if thermal budget is tight or sequencing required. |
| ON Semiconductor NCP1117ST25T3G | 2.5 V fixed, 1 A max, 1.2 V dropout at 1 A; no INH; SOT-223 package. | Higher dropout limits usable input range; no logic control; higher quiescent current (>5 mA at light load). | Choose only for legacy designs with ample input margin and no need for low-Iq shutdown. |
Compared with XC6215B252MR-G and NCP1117ST25T3G, LD29150DT25R delivers 50% higher current, half the dropout voltage, integrated shutdown, and superior thermal performance - making it the optimal choice for high-density, thermally demanding, or battery-constrained 2.5 V systems.
Availability
LD29150DT25R is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LD29150DT25R 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 microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.
LD29150DT25R belongs to ST's high-current LDO regulator product line, engineered specifically for post-regulation in power-constrained and thermally sensitive applications where minimal voltage overhead and robust protection are mandatory.
FAQ
What is the minimum input voltage required for LD29150DT25R to maintain regulation at 1.5 A?
The minimum input voltage is VO + VDROP = 2.5 V + 0.4 V = 2.9 V under typical conditions. However, the datasheet specifies VI ≥ 3.5 V for guaranteed 2.5 V output across full temperature and load range due to worst-case dropout (0.7 V) and line regulation effects.
Can LD29150DT25R be used without the INH pin connected?
Yes - the INH pin is internally pulled up; leaving it unconnected defaults the device to enabled state. For guaranteed startup, tie INH to VI through a 10 kΩ resistor or directly to VI if system-level control is not needed.
What output capacitor value and type are required for stability?
A minimum 10 µF ceramic capacitor (X5R/X7R, 6.3 V rating) is required at the OUT pin. ST recommends CO = 10 µF with ESR < 100 mΩ; larger values improve transient response but do not affect basic stability per the datasheet.
How does thermal performance differ between PPAK and DPAK packages for LD29150DT25R?
Both packages share identical RthJC = 8 °C/W, but PPAK offers lower RthJA in PCB-optimized layouts due to enhanced thermal pad soldering area. DPAK requires larger copper pour for equivalent cooling; PPAK is preferred for high-density, high-power applications.
LD29150DT25R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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 @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 80 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:
- DPAK
LD29150DT25R FAQ
1.How can I place an order for LD29150DT25R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD29150DT25R 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 LD29150DT25R reliable?
The price and inventory of LD29150DT25R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29150DT25R is usually 5 days.
3.What payment methods are accepted for LD29150DT25R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29150DT25R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD29150DT25R?
LD29150DT25R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD29150DT25R 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 LD29150DT25R?
For technical support, including LD29150DT25R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29150DT25R requirements.
6.How does Aetrix verify that LD29150DT25R is sourced from the original manufacturer or authorized distributors?
All LD29150DT25R 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 LD29150DT25R meets industry standards.
7.What is the process for return or replacement of LD29150DT25R?
All LD29150DT25R units undergo pre-shipment inspection (PSI). If there is an issue with LD29150DT25R, 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 LD29150DT25R part is unused and in its original packaging.
Return procedure for LD29150DT25R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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