Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics LD29300P2M18R

Name: LD29300P2M18R
Brand: STMicroelectronics
SKU: LD29300P2M18R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LD29300P2M18R

Manufacturer:: STMicroelectronics

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

Package:: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA

Datasheet:: LD29300P2M18R.pdf

Description:: IC REG LINEAR 1.8V 3A P2PAK-4

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,625

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LD29300P2M18R from STMicroelectronics is a 1.8 V, 3 A fixed-output low-dropout linear regulator in P2PAK package with ±1 % output voltage tolerance at 25 °C, 0.4 V typical dropout at 3 A, and logic-controlled electronic shutdown. It delivers high-accuracy post-regulation for CPU core supplies in embedded computing systems requiring stable low-voltage bias under dynamic load.

For engineers reviewing the LD29300P2M18R datasheet, LD29300P2M18R pinout, LD29300P2M18R application, or LD29300P2M18R equivalent, key selection criteria include guaranteed 3 A output current, thermal-limited operation up to 125 °C junction temperature, ground current as low as 20 mA at 1.5 A load, and compatibility with 10 µF ceramic output capacitance for transient stability.

Technical Context

This LDO employs internal current limiting and thermal shutdown circuitry to protect against overload and overheating. Its fixed 1.8 V output is trimmed during production to ±1 % accuracy at 25 °C and maintains ≤1.0 % load regulation across 10 mA–3 A output current range.

The device integrates an inhibit (INH) input enabling logic-level ON/OFF control with 0.8 V logic-low threshold and 2 V logic-high threshold. Dropout voltage remains ≤0.7 V at 3 A over –40 °C to 125 °C, defined as the input-to-output differential where output drops to 99 % of nominal value.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	1.8 V ±1 % at 25 °C; ensures precise core voltage for 1.8 V logic rails in microcontrollers and FPGAs
Max output current	3 A guaranteed; supports high-current digital loads without external pass devices
Dropout voltage	0.4 V typ. at 3 A; enables operation with only 2.2 V input for 1.8 V output, minimizing power loss
Quiescent current	20–50 mA at 1.5 A load; balances efficiency and regulation speed in battery-sensitive applications
Supply rejection	62 dB min. at 120 Hz; suppresses ripple from upstream switching converters in hybrid power architectures
Output noise	60 µV_RMS (10 Hz–100 kHz); suitable for noise-sensitive analog subsystems powered from same rail
Thermal resistance	3 °C/W junction-to-case; requires minimal heatsinking when mounted on PCB copper pour

Pinout & Package

LD29300P2M18R uses the P2PAK surface-mount package (JEDEC TO-263 variant), featuring exposed thermal pad for enhanced heat dissipation and mechanical robustness in high-power linear regulation.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 3–7.3 V DC input; must be ≥2.2 V above output to maintain regulation at full 3 A load
2 (GND)	Ground reference	Common return path for input, output, and control circuits; connects to thermal pad for optimal thermal performance
3 (OUT)	Regulated output	Delivers stable 1.8 V ±1 %; requires ≥10 µF ceramic output capacitor for stability and transient response
4 (INH)	Inhibit control input	Active-low enable: <0.8 V disables regulator (quiescent current ≤180 µA), >2 V enables normal operation

Key Features

Feature	Design Value
Very low dropout	0.4 V typical at 3 A enables use with minimal input headroom-critical for battery-powered 1.8 V systems
Fixed 1.8 V output	±1 % tolerance at 25 °C and ≤1.0 % load regulation ensure reliable core voltage for modern low-voltage ICs
Logic-controlled shutdown	INH pin draws only 5–10 µA and supports direct interfacing with 1.8/3.3 V GPIO for system-level power sequencing
Internal protection	Current limit and thermal shutdown prevent damage during short-circuit or overload conditions without external components
Low-noise operation	60 µV_RMS output noise avoids interference in mixed-signal applications sharing the 1.8 V rail

Applications

Computer Systems

Battery-Powered Systems

Use Scenario: Core voltage regulation for ARM Cortex-M4 microcontrollers in industrial edge gateways.

IC Role / Device Role / Timing Role: Primary 1.8 V LDO supplying CPU I/O and memory interface rails with tight tolerance and fast transient response.

Use Value: Maintains 1.8 V ±1.8% under 10 mA–2.5 A dynamic load steps, preventing brown-out resets during burst processing.

Use Scenario: Power management in portable medical glucose meters with dual 1.8 V sensor and MCU domains.

IC Role / Device Role / Timing Role: Low-quiescent LDO delivering regulated 1.8 V from single Li-ion cell (3.0–4.2 V) with INH-controlled sleep mode.

Use Value: Reduces standby current to ≤180 µA when disabled, extending battery life beyond 12 months on 500 mAh cell.

Power Supply Post-Regulation

Consumer Electronics

Use Scenario: Clean 1.8 V rail generation downstream of buck converter in set-top box power tree.

IC Role / Device Role / Timing Role: Ripple-rejecting LDO filtering switching noise from 3.3 V intermediate bus to feed HDMI PHY and audio DAC.

Use Value: 62 dB SVR at 120 Hz attenuates buck converter ripple to <100 µV_PP, eliminating audible noise in audio outputs.

Use Scenario: Voltage supply for 1.8 V NAND flash memory in smart home hubs.

IC Role / Device Role / Timing Role: High-current LDO ensuring stable 1.8 V during page-program bursts (up to 3 A peak for <100 µs).

Use Value: 0.4 V dropout allows operation down to 2.2 V input, supporting graceful shutdown as battery discharges to 2.5 V.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSM1083-18DCQ	1.8 V, 3 A, 0.35 V dropout typ. at 3 A; 50 µV_RMS noise; no INH pin	Lacks logic shutdown-requires external MOSFET for system power gating	Preferred when lowest possible dropout and noise are critical, and shutdown is handled externally
MCP1826T-1802E/DC	1.8 V, 3 A, 0.45 V dropout typ. at 3 A; 120 µV_RMS noise; includes INH pin	Higher output noise limits use in precision analog sections sharing the rail	Selected when broader operating temperature range (–40 °C to 150 °C) and automotive qualification are required

Compared with LD29300P2M18R, TSM1083-18DCQ offers lower dropout but no integrated shutdown, while MCP1826T-1802E/DC adds automotive temp rating at the cost of higher noise-making LD29300P2M18R optimal for industrial embedded systems needing balanced performance, control, and thermal robustness.

Availability

LD29300P2M18R is available at Aetrix Electronics and suitable for computer systems, battery-powered medical devices, and power supply post-regulation requiring stable component supply with consistent parametric performance across production batches.

Supply support for LD29300P2M18R 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 LD29300 series targets high-current, low-dropout linear regulation in space-constrained embedded systems, emphasizing accuracy, thermal resilience, and ease of integration in multi-rail power architectures.

FAQ

What is the minimum input voltage required for LD29300P2M18R to regulate at full 3 A output?

The minimum input voltage is 2.2 V above nominal output, i.e., 4.0 V, to maintain regulation at 3 A load and 125 °C junction temperature. At room temperature, 3.8 V input suffices per electrical characteristics table for LD29300#18. Input below this threshold causes dropout and unregulated output.

Can LD29300P2M18R operate without an output capacitor?

No. A minimum 10 µF ceramic output capacitor is mandatory for stability, as confirmed in Table 5 test conditions and Figure 15 (stability vs CO). Omitting it risks oscillation, excessive output ripple, and potential thermal runaway under load.

How does the INH pin behave during power-up sequences?

The INH pin defaults to high-impedance until V_IN reaches ~2.5 V; once powered, applying <0.8 V disables the regulator (output off, I_q ≤180 µA), while >2 V enables regulation. No external pull-up is needed due to internal biasing.

Is LD29300P2M18R qualified for automotive applications?

No. LD29300P2M18R is specified for industrial temperature range (–40 °C to 125 °C) and lacks AEC-Q100 qualification. For automotive use, ST recommends the pin-compatible LD29300P2M18R-AUT, which includes extended temperature validation and PPAP documentation.

LD29300P2M18R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 30V

Voltage - Output (Min/Fixed):: 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.7V @ 3A

Current - Output:: 3A

Current - Quiescent (Iq):: 50 mA

Current - Supply (Max):: 100 mA

PSRR:: 72dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: P2PAK-4

LD29300P2M18R FAQ

1.How can I place an order for LD29300P2M18R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD29300P2M18R 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 LD29300P2M18R reliable?

The price and inventory of LD29300P2M18R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29300P2M18R is usually 5 days.

3.What payment methods are accepted for LD29300P2M18R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29300P2M18R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD29300P2M18R?

LD29300P2M18R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD29300P2M18R 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 LD29300P2M18R?

For technical support, including LD29300P2M18R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29300P2M18R requirements.

6.How does Aetrix verify that LD29300P2M18R is sourced from the original manufacturer or authorized distributors?

All LD29300P2M18R 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 LD29300P2M18R meets industry standards.

7.What is the process for return or replacement of LD29300P2M18R?

All LD29300P2M18R units undergo pre-shipment inspection (PSI). If there is an issue with LD29300P2M18R, 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 LD29300P2M18R part is unused and in its original packaging.

Return procedure for LD29300P2M18R:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

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 …