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

STMicroelectronics LD29300D2M15R

Name: LD29300D2M15R
Brand: STMicroelectronics
SKU: LD29300D2M15R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD29300D2M15R

Manufacturer:: STMicroelectronics

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

Package:: TO-263-4, D2PAK (3 Leads + Tab), TO-263AA

Datasheet:: LD29300D2M15R.pdf

Description:: IC REG LINEAR 1.5V 3A D2PAK/A

Quantity:: RFQ Add To RFQ list

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Inventory:3,880

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Product details

Overview

LD29300D2M15R from STMicroelectronics is a 1.5 V, 3 A fixed-output low-dropout linear regulator in D2PAK package, featuring 400 mV typical dropout at full load, ±1 % output voltage tolerance at 25 °C, internal current and thermal limiting, and logic-controlled electronic shutdown. It serves as a post-regulation stage in high-current DC-DC converter outputs and battery-powered systems requiring stable low-voltage rails.

For engineers reviewing the LD29300D2M15R datasheet, LD29300D2M15R pinout, LD29300D2M15R application, or LD29300D2M15R equivalent, key selection criteria include dropout performance at 3 A, ground current behavior under load, thermal resistance (R_thJC = 3 °C/W), and compatibility with 10 µF ceramic output capacitance for stability.

Technical Context

This LDO employs a PNP pass transistor architecture enabling ultra-low dropout while maintaining high PSRR (75 dB at 120 Hz) and tight line/load regulation (0.06 %/0.2 %). Its integrated inhibit function allows external logic-level control of output enable/disable via the INH pin.

The device operates across –40 to 125 °C junction temperature, supports input voltages up to 30 V (with automatic shutdown above 14 V), and delivers guaranteed 3 A output current with internal foldback current limiting and thermal shutdown protection.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	1.5 V ±1 % at 25 °C; maintains regulation across –40 to 125 °C with ≤1.0 % load/line variation
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 end-of-discharge support
Quiescent current	45–100 mA at 3 A load; remains stable across temperature and input voltage, minimizing no-load power loss
Supply rejection	75 dB typ. at 120 Hz; suppresses ripple from upstream switching converters in hybrid power architectures
Thermal resistance	R_thJC = 3 °C/W; enables high-power dissipation with minimal junction-to-case delta-T when mounted on heatsink
Short-circuit current	4.5 A; provides robust fault containment without external current-sense circuitry
Noise voltage	60 µV_RMS (10 Hz–100 kHz); suitable for noise-sensitive analog subsystems like ADC references or RF bias rails

Pinout & Package

D2PAK (TO-263) thermally enhanced surface-mount package with exposed drain pad for direct PCB thermal coupling; 3-pin configuration (Input, Output, Inhibit).

Pin/Terminal	Circuit Role	Design Meaning
IN	Regulator input supply	Accepts 2.5–30 V DC; internal clamp activates shutdown above 14 V to prevent overstress
OUT	Regulated output	Delivers 1.5 V ±1 %; requires ≥10 µF ceramic output capacitor for stability per datasheet Figure 4
INH	Inhibit control input	Active-low logic interface: <0.8 V disables output; >2 V enables; draws ≤10 µA leakage

Key Features

Feature	Design Value
Ultra-low dropout	0.4 V typ. at 3 A enables use in 2-cell Li-ion (6.4 V max) or 3-cell NiMH (4.5 V max) battery systems down to end-of-life voltage
High accuracy output	±1 % tolerance at 25 °C and ±1.5 % over full temperature/load range ensures reliable logic-level compliance for 1.5 V core supplies
Integrated protection	Current limit + thermal shutdown + safe operating area (SOA) control eliminate need for external fault management circuitry
Logic-compatible enable	INH pin accepts standard 3.3 V/5 V logic levels with microampere input current, simplifying MCU GPIO interfacing
Low-noise operation	60 µV_RMS broadband noise avoids corruption of precision analog signal chains powered from same rail

Applications

Power Supply Post-Regulation

Computer System Core Rail

Use Scenario: Final-stage regulation after a buck converter supplying CPU I/O or memory interface voltage.

IC Role / Device Role / Timing Role: Low-noise, high-current LDO providing clean 1.5 V to DDR2/3 termination or PCIe auxiliary rails.

Use Value: 75 dB PSRR attenuates switching ripple from upstream converter; 0.4 V dropout preserves headroom during transient load steps.

Use Scenario: Dedicated 1.5 V supply for FPGA I/O banks or ASIC core logic in embedded computing platforms.

IC Role / Device Role / Timing Role: Precision voltage source ensuring stable logic thresholds and timing margins under dynamic load conditions.

Use Value: ±1 % output tolerance guarantees VIH/VIL margin compliance; 3 A rating supports multi-bank simultaneous switching.

Battery-Powered Instrumentation

Industrial Monitor Power

Use Scenario: Portable test equipment powered by 2S Li-ion battery (6.4–8.4 V), requiring regulated 1.5 V for sensor front-end amplifiers.

IC Role / Device Role / Timing Role: Low-noise, low-quiescent LDO delivering stable reference voltage to precision op-amps and ADC drivers.

Use Value: 60 µV_RMS noise prevents SNR degradation; 0.4 V dropout extends usable battery life by ~12% vs. standard LDOs.

Use Scenario: Standalone LCD monitor with integrated scaler, using LD29300D2M15R for 1.5 V logic supply in main board power tree.

IC Role / Device Role / Timing Role: High-reliability post-regulator handling surge currents during display initialization and backlight ramp-up.

Use Value: 4.5 A short-circuit limit and thermal shutdown protect against connector shorts or ESD-induced latch-up events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LD29300D2T15R	Same electrical specs but TO-220 package; R_thJA = 50 °C/W vs. 60 °C/W for D2PAK; no exposed thermal pad	Preferred for prototyping or low-volume through-hole assembly; less efficient thermal performance in high-power density layouts	Select D2T15R only if manual soldering or heatsink mounting without thermal vias is required
TSM1083D15R	1.5 V, 3 A LDO with 0.35 V dropout (typ.), but higher quiescent current (120 mA at 3 A) and no inhibit function	Suitable where enable control is unnecessary and lower dropout is prioritized over shutdown capability	Choose TSM1083D15R only when system-level power sequencing does not require active output disable

Compared with LD29300D2T15R, the D2M15R offers superior thermal performance in SMT layouts; versus TSM1083D15R, it trades marginal dropout reduction for essential logic-controlled shutdown and lower ground current - critical for battery runtime and functional safety.

Availability

LD29300D2M15R is available at Aetrix Electronics and suitable for computer systems, industrial monitors, and battery-powered instrumentation requiring stable component supply with long-term manufacturability and consistent parametric performance.

Supply support for LD29300D2M15R 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.

LD29300 belongs to ST's high-current LDO portfolio targeting post-regulation and battery-powered applications where ultra-low dropout, precision output, and integrated protection are mandatory design requirements.

FAQ

What is the minimum input voltage required for LD29300D2M15R to regulate 1.5 V at 3 A?

The minimum input voltage is VO + VDROP = 1.5 V + 0.4 V = 1.9 V (typical). Per Table 4, VI must be ≥2.5 V to guarantee operation across –40 to 125 °C with full 3 A load and 1 % tolerance. Below 2.5 V, regulation is not assured due to process and temperature variation.

Can LD29300D2M15R be used without the INH pin connected?

Yes - the INH pin is internally pulled up; leaving it open defaults to enabled state. However, ST recommends tying INH to VIN through a 10 kΩ resistor for noise immunity in electrically noisy environments, as specified in Application Note AN2812.

What output capacitor value and type are required for stability?

A minimum 10 µF ceramic capacitor (X5R/X7R, 6.3 V rated) is required at the output, placed within 5 mm of the OUT and GND pins. The datasheet confirms stability with CO ≥ 10 µF and ESR ≤ 10 mΩ; tantalum or aluminum electrolytics are not recommended due to ESR and aging effects.

Does LD29300D2M15R require an input capacitor?

An input capacitor is not strictly required for stability but is strongly recommended: 330 nF ceramic (X7R, 16 V) placed near the IN pin reduces high-frequency noise and improves transient response. This matches the test condition in Table 4 and Figure 4 of the datasheet.

LD29300D2M15R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-4, D2PAK (3 Leads + Tab), TO-263AA

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):: 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:: Surface Mount

Supplier Device Package:: D2PAK-3

LD29300D2M15R FAQ

1.How can I place an order for LD29300D2M15R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD29300D2M15R 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 LD29300D2M15R reliable?

The price and inventory of LD29300D2M15R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29300D2M15R is usually 5 days.

3.What payment methods are accepted for LD29300D2M15R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29300D2M15R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD29300D2M15R?

LD29300D2M15R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD29300D2M15R 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 LD29300D2M15R?

For technical support, including LD29300D2M15R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29300D2M15R requirements.

6.How does Aetrix verify that LD29300D2M15R is sourced from the original manufacturer or authorized distributors?

All LD29300D2M15R 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 LD29300D2M15R meets industry standards.

7.What is the process for return or replacement of LD29300D2M15R?

All LD29300D2M15R units undergo pre-shipment inspection (PSI). If there is an issue with LD29300D2M15R, 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 LD29300D2M15R part is unused and in its original packaging.

Return procedure for LD29300D2M15R:

1.Submit a request within 90 days.

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

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