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STMicroelectronics LD29150DT15
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- Part No.:
- LD29150DT15
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LD29150DT15.pdf
- Description:
- IC REG LINEAR 1.5V 1.5A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,529
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Product details
Overview
LD29150DT15 from STMicroelectronics is a 1.5 A, fixed-output (1.5 V) low-dropout linear regulator in DPAK package, featuring 400 mV typical dropout at full load, ±1% output voltage accuracy over temperature, and logic-controlled electronic shutdown. It delivers stable post-regulation for CPU core supplies in embedded systems and battery-powered devices where ultra-low dropout and ground current are critical.
For engineers reviewing the LD29150DT15 datasheet, LD29150DT15 pinout, LD29150DT15 application, or LD29150DT15 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and confirmed alternative parts with documented functional differences.
Technical Context
The LD29150DT15 integrates internal current limiting and thermal shutdown circuitry, with a dedicated inhibit (INH) input enabling logic-level ON/OFF control. Its reference voltage is trimmed to ±1% at 25 °C and maintains tight regulation across –40 °C to +125 °C junction temperature.
Designed for high-current, low-noise applications, it achieves 72 dB supply voltage rejection at 120 Hz and delivers 72 µVRMS output noise (10 Hz–100 kHz) at 100 mA load - critical for powering sensitive analog or RF subsystems downstream of switching converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±1% (–40 °C to +125 °C), enabling direct core supply for low-voltage microcontrollers without external feedback. |
| Dropout Voltage | 0.4 V typ. at 1.5 A load, allowing operation with only 1.9 V input - essential for single-cell Li-ion or multi-cell NiMH battery systems. |
| Output Current | Guaranteed 1.5 A continuous, supporting high-power SoCs and FPGAs requiring clean, regulated auxiliary rails. |
| Quiescent Current | 30–80 mA at 1.5 A load, minimizing power loss during active operation while maintaining fast transient response. |
| Thermal Shutdown | 150 °C junction temperature threshold with automatic recovery, protecting against sustained overload or poor heatsinking in compact enclosures. |
| Supply Rejection | 62 dB min. at 120 Hz, effectively attenuating ripple from upstream DC-DC converters used in hybrid power architectures. |
| Noise Performance | 72 µVRMS (10 Hz–100 kHz), ensuring minimal interference on precision ADC references or audio codec power domains. |
Pinout & Package
DPAK (TO-252-3) thermally enhanced surface-mount package with exposed drain pad for PCB heat sinking; compatible with standard reflow profiles and industrial-grade thermal cycling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts up to 30 V DC input; internal clamp activates above 14 V to force shutdown - prevents damage during input transients. |
| 2 (GND) | Ground reference and thermal path | Common return for all internal circuits; exposed pad must be soldered to large copper area for RthJA = 100 °C/W performance. |
| 3 (OUT) | Regulated output | Delivers stable 1.5 V; requires ≥10 µF ceramic output capacitor for stability per Figure 4 and Section 3. |
| 4 (INH) | Inhibit control input | Active-high logic interface: ≥2 V enables regulation; ≤0.8 V disables output and reduces quiescent current to 130–180 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 400 mV typ. at 1.5 A enables use with marginal input margins - e.g., 1.9 V input for 1.5 V rail in portable systems. |
| Logic-controlled shutdown | INH pin reduces standby current to <200 µA, extending battery life in sleep-mode applications like IoT edge nodes. |
| ±1% output accuracy | Ensures compliance with tight core voltage tolerances of modern ARM Cortex-M7/M33 processors and FPGA I/O banks. |
| Integrated protection | Combines current limit, thermal shutdown, and input overvoltage clamp - eliminates need for external fault management circuitry. |
| Low noise output | 72 µVRMS noise supports noise-sensitive loads such as PLLs, RF transceivers, and high-resolution SAR ADCs. |
Applications
| Industrial PLC I/O Modules | Portable Medical Sensors |
|---|---|
|
Use Scenario: Powering isolated analog front-end (AFE) circuits and 24-bit delta-sigma ADCs in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Low-noise post-regulator supplying clean 1.5 V reference and bias rails for precision signal conditioning. Use Value: 72 µVRMS noise and 62 dB SVR prevent digitization errors caused by switching converter ripple coupling into measurement paths. |
Use Scenario: Regulating power for wearable ECG/PPG sensor ASICs operating from coin-cell or small Li-Po batteries. IC Role / Device Role / Timing Role: Primary core supply delivering 1.5 V at up to 1.5 A during active sensing bursts, with INH-controlled deep-sleep mode. Use Value: 0.4 V dropout allows >90% battery utilization down to 1.9 V input; 130–180 µA shutdown current extends runtime between charges. |
| Embedded Vision Cameras | Automotive Infotainment Processors |
|
Use Scenario: Providing stable 1.5 V core voltage to image signal processors (ISPs) and MIPI CSI-2 transmitters in compact camera modules. IC Role / Device Role / Timing Role: High-current LDO decoupling switching noise from DC-DC pre-regulators feeding ISP cores and memory interfaces. Use Value: 1.5 A capability and 72 dB SVR suppress supply-induced jitter in pixel clock domains, preserving image SNR and timing integrity. |
Use Scenario: Supplying 1.5 V auxiliary rail to application processors (e.g., NXP i.MX8) in head-unit designs with wide input voltage range (9–16 V). IC Role / Device Role / Timing Role: Post-regulator after buck converter, providing precise, ripple-free voltage under dynamic load steps from GPU/CPU activity. Use Value: ±1% accuracy and 0.2% line/load regulation ensure processor stability across automotive battery fluctuations and thermal gradients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout, high-current regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS7A8300RGRT | 1.5 A, 1.5 V fixed, 0.25 V dropout typ. at 1.5 A; 50 µVRMS noise; no INH pin - uses EN only. | Lacks logic-controlled shutdown with ultra-low µA standby; better noise but less flexible control in battery systems. | Select when lowest possible noise dominates over programmable shutdown; verify EN timing compatibility with host MCU. |
| Analog Devices ADM7172ACPZ-R7 | 2 A, 1.5 V fixed, 0.15 V dropout typ. at 2 A; 3.5 µVRMS noise; requires external feedback resistors even for fixed outputs. | Higher current and lower dropout, but fixed 1.5 V version not available - requires resistor network, increasing BOM count and layout area. | Choose for higher current margin or tighter dropout, accepting added complexity and cost of external resistors. |
Compared with TPS7A8300RGRT and ADM7172ACPZ-R7, the LD29150DT15 uniquely combines integrated INH control, DPAK thermal performance, and production-proven reliability in cost-sensitive industrial and medical applications - without requiring external components for fixed-output operation.
Availability
LD29150DT15 is available at Aetrix Electronics and suitable for industrial PLCs, portable medical sensors, embedded vision cameras, and automotive infotainment processors requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LD29150DT15 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 silicon solutions for automotive, industrial, and consumer markets since 1987.
The LD29150 series belongs to ST's high-accuracy, high-current LDO portfolio, engineered specifically for post-regulation in power-constrained systems where dropout voltage, noise, and thermal robustness directly impact end-equipment reliability.
FAQ
What is the minimum input voltage required for LD29150DT15 to regulate 1.5 V at 1.5 A?
The minimum input voltage is 1.9 V - calculated as 1.5 V output plus 0.4 V typical dropout at full load. Operation below this causes output collapse; the device remains functional down to 2.5 V input per absolute maximum ratings, but regulation ceases below 1.9 V.
Does LD29150DT15 require an external capacitor on the INH pin?
No external capacitor is required on the INH pin. It is a CMOS-compatible digital input with 5–10 µA leakage current; pull-up or pull-down resistors may be used for default state control, but no filtering capacitor is specified or recommended in the datasheet.
Can LD29150DT15 be paralleled for higher current capacity?
Paralleling is not supported. The device lacks current-sharing features such as remote sense or droop compensation; mismatched dropout voltages would cause uneven current distribution and potential thermal runaway - use a single higher-current LDO instead.
What is the thermal resistance (RthJA) of LD29150DT15 in its DPAK package?
The junction-to-ambient thermal resistance is 100 °C/W under standard JEDEC 51-7 PCB conditions (1-inch² 2-oz copper pad). Achieving this requires proper soldering of the exposed thermal pad to a solid copper plane; insufficient copper area increases RthJA and limits safe operating current.
LD29150DT15 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 80 mA
- PSRR:
- 75dB (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
LD29150DT15 FAQ
1.How can I place an order for LD29150DT15 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD29150DT15 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 LD29150DT15 reliable?
The price and inventory of LD29150DT15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29150DT15 is usually 5 days.
3.What payment methods are accepted for LD29150DT15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29150DT15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD29150DT15?
LD29150DT15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD29150DT15 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 LD29150DT15?
For technical support, including LD29150DT15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29150DT15 requirements.
6.How does Aetrix verify that LD29150DT15 is sourced from the original manufacturer or authorized distributors?
All LD29150DT15 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 LD29150DT15 meets industry standards.
7.What is the process for return or replacement of LD29150DT15?
All LD29150DT15 units undergo pre-shipment inspection (PSI). If there is an issue with LD29150DT15, 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 LD29150DT15 part is unused and in its original packaging.
Return procedure for LD29150DT15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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