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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

STMicroelectronics LD29150PT50R

Name: LD29150PT50R
Brand: STMicroelectronics
SKU: LD29150PT50R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD29150PT50R

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-252-5, DPAK (4 Leads + Tab), TO-252AD

Datasheet:: LD29150PT50R.pdf

Description:: IC REG LINEAR 5V 1.5A PPAK

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Inventory:19,421

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Product details

Overview

LD29150PT50R from STMicroelectronics is a fixed-output 5.0 V, 1.5 A low-dropout linear regulator in PPAK package with 400 mV typical dropout at full load, ±1% output voltage accuracy over temperature, and logic-controlled electronic shutdown. It delivers stable post-regulation for switching power supplies and powers sensitive analog/digital circuitry in battery-powered systems where ultra-low dropout and ground current are critical.

For engineers reviewing the LD29150PT50R datasheet, LD29150PT50R pinout, LD29150PT50R application, or LD29150PT50R equivalent, key selection criteria include guaranteed 1.5 A output current, thermal shutdown at 150 °C, 200 µV_RMS output noise (10 Hz–100 kHz), and compatibility with 10 µF ceramic output capacitors.

Technical Context

The LD29150PT50R implements a high-accuracy bandgap reference and internal current-limiting circuitry to maintain regulation under transient load steps up to 1.5 A. Its PPAK package provides 8 °C/W junction-to-case thermal resistance, enabling operation at full rated current without external heatsinking in ambient temperatures up to 125 °C.

It features an inhibit (INH) input that enables logic-level control of output state, with valid logic-low threshold ≤0.8 V and logic-high threshold ≥2.0 V. The device enters automatic shutdown when input voltage exceeds 14 V or junction temperature reaches 150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	5.0 V ±1% (4.95–5.05 V) at 10 mA–1.5 A load, ensuring stable supply for 5 V microcontrollers and peripherals.
Dropout voltage	0.4 V typ. at 1.5 A, allowing operation with only 5.4 V input for 5 V output - critical for battery systems near end-of-discharge.
Quiescent current	30–80 mA at 1.5 A load, minimizing idle power loss in always-on embedded applications.
Thermal shutdown	150 °C junction temperature, providing robust protection during overload or poor PCB thermal design.
Output noise	200 µV_RMS (10 Hz–100 kHz), suitable for noise-sensitive analog circuits like ADC references or audio amplifiers.
Supply rejection	49–64 dB at 120 Hz, suppressing ripple from upstream switching converters in hybrid power architectures.
Short-circuit current	2.2 A, limiting fault energy while maintaining safe SOA during output shorts.

Pinout & Package

LD29150PT50R uses the PPAK (Power Package) thermally enhanced surface-mount package with exposed thermal pad (D²PAK-compatible footprint). Dimensions: 6.0 × 6.4 × 10.1 mm (L × W × H), with 8 °C/W R_thJC.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 6–10.5 V DC input; clamps internally above 14 V to prevent damage.
2 (GND)	Ground reference	Common return path for load, bias, and thermal pad; must be low-impedance for stability.
3 (OUT)	Regulated output	Delivers 5.0 V ±1% to load; requires ≥10 µF ceramic capacitor for stability per datasheet.
4 (INH)	Inhibit control input	Active-low enable: <0.8 V = OFF, >2.0 V = ON; draws ≤10 µA when asserted.

Key Features

Feature	Design Value
Ultra-low dropout	0.4 V typ. at 1.5 A enables single-cell Li-ion (3.0–4.2 V) + boost or multi-cell NiMH operation down to 5.4 V input.
Logic-controlled shutdown	INH pin supports system-level power sequencing and standby mode with <180 µA quiescent current in shutdown.
High accuracy output	±1% tolerance over -40 to +125 °C ensures reliable operation in automotive cabin and industrial environments.
Integrated protection	Internal current limit and thermal shutdown eliminate need for external foldback or thermal sensors.
Low-noise regulation	200 µV_RMS noise allows direct powering of precision analog stages without additional LDO filtering.

Applications

Industrial PLC I/O Modules

Automotive Infotainment Power Rails

Use Scenario: Providing clean 5 V supply to isolated digital I/O drivers and ADC front-ends in programmable logic controllers.

IC Role / Device Role / Timing Role: Post-regulator for buck converter outputs, delivering low-noise, thermally robust 5 V rail.

Use Value: 0.4 V dropout preserves headroom across wide input range (12–24 V bus); ±1% accuracy maintains sensor measurement integrity.

Use Scenario: Powering USB host controllers, display interface ICs, and audio codecs in head unit mainboards.

IC Role / Device Role / Timing Role: Local LDO for noise-sensitive subsystems requiring independent enable control and thermal margin.

Use Value: INH pin enables synchronized power-down with MCU sleep states; 200 µV_RMS noise prevents audible artifacts in audio paths.

Battery-Powered Test Equipment

Networking Edge Router Management ASICs

Use Scenario: Supplying 5 V to microcontroller, RF transceiver, and precision op-amps in handheld multimeters and signal generators.

IC Role / Device Role / Timing Role: Primary regulated rail sourced from 2S Li-ion pack (6–8.4 V), with shutdown during deep sleep.

Use Value: 30–80 mA quiescent current at full load extends runtime; 150 °C thermal shutdown prevents field failures during probe short events.

Use Scenario: Generating stable 5 V for baseboard management controller (BMC), fan controllers, and EEPROM interfaces.

IC Role / Device Role / Timing Role: Standby LDO with logic enable, supporting hot-swap and firmware update sequencing.

Use Value: 49–64 dB PSRR suppresses ripple from shared 12 V intermediate bus; PPAK package enables compact layout near BGA ASICs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LD29150DT50R	DPAK package (R_thJA = 100 °C/W vs. PPAK's 100 °C/W, but R_thJC = 8 °C/W identical); same electrical specs.	No exposed thermal pad; requires larger copper area for equivalent thermal performance.	Select DT50R for legacy DPAK-compatible layouts or manual assembly; PT50R preferred for automated SMT with thermal pad reflow.
TSM1050	5 V fixed, 1.5 A LDO with 0.5 V dropout (typ.), 100 µV_RMS noise, no INH pin, TO-252 package.	Lacks logic shutdown; higher noise margin but lower thermal performance (R_thJC ≈ 12 °C/W).	Choose TSM1050 only if INH functionality is unused and board space permits TO-252; otherwise PT50R offers superior integration.

Compared with LD29150DT50R, the PT50R offers identical regulation performance with improved manufacturability via PPAK's thermal pad; versus TSM1050, it adds essential enable control and lower noise at the cost of slightly higher quiescent current.

Availability

LD29150PT50R is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive infotainment systems, and battery-powered test equipment requiring stable component supply with full production lifecycle support.

Supply support for LD29150PT50R 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 LD29150 series belongs to ST's high-current LDO portfolio, engineered specifically for post-regulation in power-constrained systems where minimal dropout, tight accuracy, and integrated protection are mandatory.

FAQ

What is the minimum input voltage required for stable 5.0 V output at 1.5 A?

The LD29150PT50R requires a minimum input voltage of 5.4 V (5.0 V + 0.4 V dropout) to maintain regulation at 1.5 A load. Below this, output voltage collapses linearly with input; datasheet specifies VI ≥ 6 V for guaranteed 5.0 V operation across temperature and line/load conditions.

Can the INH pin be left unconnected, or does it require a pull-up/down resistor?

The INH pin must not be left floating. For default-enable operation, connect INH to VIN through a 10 kΩ resistor; for default-disable, tie INH to GND. Floating INH may cause erratic output behavior due to noise coupling, as the logic threshold is 0.8 V (low) and 2.0 V (high).

Is a 10 µF ceramic output capacitor sufficient for stability across all operating conditions?

Yes - ST specifies 10 µF X7R/X5R ceramic capacitors (with ESR < 100 mΩ) as sufficient for unconditional stability across 10 mA–1.5 A loads and -40 to +125 °C. Larger values improve transient response but are not required; tantalum or aluminum electrolytics are not recommended due to ESR and aging effects.

How does thermal performance compare between PPAK and DPAK packages at 1.5 A continuous load?

Both packages share identical 8 °C/W R_thJC, but PPAK's exposed thermal pad enables lower R_thJA in optimized PCB layouts (e.g., 4-layer board with 2-in² 2-oz copper pour). At 1.5 A, PPAK typically runs 8–12 °C cooler than DPAK under identical board conditions, delaying thermal shutdown onset.

LD29150PT50R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-5, DPAK (4 Leads + Tab), TO-252AD

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):: 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:: 64dB (120Hz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PPAK

LD29150PT50R FAQ

1.How can I place an order for LD29150PT50R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD29150PT50R 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 LD29150PT50R reliable?

The price and inventory of LD29150PT50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29150PT50R is usually 5 days.

3.What payment methods are accepted for LD29150PT50R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29150PT50R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD29150PT50R?

LD29150PT50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD29150PT50R 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 LD29150PT50R?

For technical support, including LD29150PT50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29150PT50R requirements.

6.How does Aetrix verify that LD29150PT50R is sourced from the original manufacturer or authorized distributors?

All LD29150PT50R 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 LD29150PT50R meets industry standards.

7.What is the process for return or replacement of LD29150PT50R?

All LD29150PT50R units undergo pre-shipment inspection (PSI). If there is an issue with LD29150PT50R, 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 LD29150PT50R part is unused and in its original packaging.

Return procedure for LD29150PT50R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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