My Inquiry
My Account
STMicroelectronics LD29300V15
- Part No.:
- LD29300V15
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LD29300V15.pdf
- Description:
- IC REG LINEAR 1.5V 3A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,092
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LD29300V15 from STMicroelectronics is a fixed-output, 1.5 V, 3 A low-dropout linear voltage regulator in TO-220 package with ±1% output voltage tolerance at 25°C, 0.4 V typical dropout at 3 A, and logic-controlled electronic shutdown. It delivers stable power for high-current, low-voltage rails in post-regulation and battery-powered systems.
For engineers reviewing the LD29300V15 datasheet, LD29300V15 pinout, LD29300V15 application, or LD29300V15 equivalent, key selection criteria include guaranteed 3 A output current, 0.4 V dropout at full load, thermal/current protection, shutdown control interface, and compatibility with 10 µF output capacitance.
Technical Context
The LD29300V15 integrates internal current limiting and thermal shutdown circuitry to protect against overload and overtemperature conditions. Its PNP pass transistor architecture enables ultra-low dropout performance without requiring external compensation components.
It features a dedicated INH (inhibit) input pin enabling logic-level ON/OFF control with 0.8 V low threshold and 2 V high threshold, supporting system-level power sequencing. Ground current remains below 100 mA at 3 A load across –40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5 V ±1% at 25°C; maintains regulation across –40°C to +125°C junction temperature and 10 mA–3 A load. |
| Dropout Voltage | 0.4 V typ. at 3 A; enables operation with only 1.9 V input for 1.5 V output - critical for battery discharge endpoints. |
| Output Current | Guaranteed 3 A continuous; internally limited to prevent damage during short-circuit or overload events. |
| Quiescent Current | 45–100 mA at 3 A load; remains stable across temperature and line variations, minimizing standby loss. |
| Supply Rejection | 65 dB typ. at 120 Hz; suppresses ripple from upstream switching regulators in hybrid power architectures. |
| Shutdown Control | INH pin accepts 0.8 V (max) logic-low to disable output; draws ≤180 µA in shutdown mode. |
| Thermal Resistance | Junction-to-case: 3°C/W (TO-220); enables direct heatsink mounting for sustained 3 A operation at elevated ambient. |
Pinout & Package
LD29300V15 is housed in a TO-220 package with three leads: Input (VI), Output (VO), and Ground (GND). The INH pin is not present on the fixed-voltage version - only available on D2T/D2M/P2T/P2M variants with inhibit function. This part (V15 suffix) is the standard fixed-output variant without enable control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Left) | Input (VI) | Accepts 2.5 V to 30 V DC input; must exceed VO by ≥0.4 V to maintain regulation at 3 A. |
| Pin 2 (Center) | Ground (GND) | Common reference for output and internal circuitry; requires low-impedance PCB connection to minimize noise. |
| Pin 3 (Right) | Output (VO) | Delivers regulated 1.5 V ±1%; requires ≥10 µF ceramic or tantalum output capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 0.4 V typ. at 3 A enables use with single-cell Li-ion (2.7–4.2 V) or multi-cell NiMH inputs down to 1.9 V. |
| High accuracy output | ±1% tolerance at 25°C and ±2% over full temperature/load range ensures reliable core voltage for low-voltage logic. |
| Integrated protection | Current limit and thermal shutdown activate autonomously - no external circuitry needed for safe 3 A operation. |
| Low ground current | ≤100 mA at 3 A load reduces total system power loss versus legacy LDOs with >200 mA quiescent draw. |
| Stable with small CO | Works with 10 µF output capacitor - eliminates need for large electrolytics and saves board space in compact designs. |
Applications
| Power Supply Post-Regulation | Computer System Core Rails |
|---|---|
|
Use Scenario: Clean, low-noise 1.5 V supply derived after a primary DC/DC converter in telecom infrastructure equipment. IC Role / Device Role / Timing Role: Final-stage LDO providing ripple-free bias to FPGA I/O banks or ASIC analog subsystems. Use Value: 65 dB PSRR at 120 Hz attenuates switching noise from upstream converters, preventing data corruption. |
Use Scenario: Dedicated 1.5 V rail for DDR2/DDR3 memory termination or CPU core auxiliary supplies. IC Role / Device Role / Timing Role: High-current, low-dropout regulator delivering stable voltage under dynamic load transients. Use Value: 0.4 V dropout allows operation from 1.9 V input - extends usable range of intermediate bus converters. |
| Battery-Powered Instrumentation | Industrial Monitor Power |
|
Use Scenario: Portable test equipment powered by 2-cell Li-ion (6.0–8.4 V) with stepped-down 1.5 V for precision ADC references. IC Role / Device Role / Timing Role: Low-noise, thermally robust regulator supplying reference voltage circuitry. Use Value: 60 µVRMS output noise (10 Hz–100 kHz) preserves signal integrity in 16-bit+ measurement systems. |
Use Scenario: Standalone 1.5 V supply for LCD bias or microcontroller peripherals in industrial display units. IC Role / Device Role / Timing Role: Primary linear regulator handling peak currents up to 3 A during backlight activation. Use Value: Junction-to-case thermal resistance of 3°C/W supports passive heatsinking - no fan required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output, high-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1117-15CDCYR | 1.5 V, 800 mA max; 1.2 V dropout at 800 mA; SOT-223 package; no shutdown pin. | Limited to sub-1 A loads; unsuitable for 3 A continuous duty or thermal-constrained layouts. | Select only for space-constrained, low-current applications where TO-220 mounting is impractical. |
| NCP1117ST15T3G | 1.5 V, 1 A max; 1.1 V dropout at 1 A; TO-220; no shutdown; ±2% initial tolerance. | Lower current rating and higher dropout reduce usable input range and efficiency in high-load scenarios. | Use when cost sensitivity outweighs performance needs and 3 A capability is unnecessary. |
Compared with TLV1117-15CDCYR and NCP1117ST15T3G, LD29300V15 uniquely delivers 3 A output with 0.4 V dropout in TO-220, enabling higher efficiency and broader input range in demanding industrial and computing applications.
Availability
LD29300V15 is available at Aetrix Electronics and suitable for power supply post-regulation, computer system core rails, and industrial monitor power requiring stable component supply, long-term manufacturability, and automotive-grade thermal reliability.
Supply support for LD29300V15 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, power, MCU, 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 and battery-powered systems demanding ultra-low dropout, tight voltage accuracy, and integrated protection.
FAQ
What is the minimum input voltage required for LD29300V15 to regulate at 3 A?
The minimum operating input voltage is 2.5 V, but to sustain 3 A output at 1.5 V, the input must exceed 1.9 V (VO + VDROP = 1.5 V + 0.4 V). Below this, the device enters dropout and output voltage drops proportionally with input.
Does LD29300V15 include thermal shutdown protection?
Yes - it integrates autonomous thermal shutdown that activates when junction temperature exceeds ~160°C. Operation resumes automatically once temperature falls below the hysteresis threshold (~140°C), protecting against permanent damage during overload or poor heatsinking.
Can LD29300V15 be used with ceramic output capacitors?
Yes - it is stable with ≥10 µF ceramic capacitors (X5R/X7R), eliminating ESR requirements of older LDOs. This simplifies layout, improves transient response, and avoids aging-related capacitance drift seen in electrolytics.
Is there a version of LD29300 with enable/shutdown functionality?
Yes - the LD29300D2T15, LD29300D2M15, LD29300P2T15, and LD29300P2M15 variants include an INH pin for logic-controlled shutdown. LD29300V15 itself is the standard fixed-output version without enable, using only VI, GND, and VO pins.
LD29300V15 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- 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:
- 3A
- Current - Quiescent (Iq):
- 50 mA
- Current - Supply (Max):
- 100 mA
- PSRR:
- 75dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
LD29300V15 FAQ
1.How can I place an order for LD29300V15 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD29300V15 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 LD29300V15 reliable?
The price and inventory of LD29300V15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29300V15 is usually 5 days.
3.What payment methods are accepted for LD29300V15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29300V15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD29300V15?
LD29300V15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD29300V15 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 LD29300V15?
For technical support, including LD29300V15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29300V15 requirements.
6.How does Aetrix verify that LD29300V15 is sourced from the original manufacturer or authorized distributors?
All LD29300V15 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 LD29300V15 meets industry standards.
7.What is the process for return or replacement of LD29300V15?
All LD29300V15 units undergo pre-shipment inspection (PSI). If there is an issue with LD29300V15, 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 LD29300V15 part is unused and in its original packaging.
Return procedure for LD29300V15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LD29300V15 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
