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

STMicroelectronics LD29300D2M18R

Name: LD29300D2M18R
Brand: STMicroelectronics
SKU: LD29300D2M18R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD29300D2M18R

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LD29300D2M18R.pdf

Description:: IC REG LINEAR 1.8V 3A D2PAK/A

Quantity:: RFQ Add To RFQ list

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Inventory:301

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Product details

Overview

LD29300D2M18R from STMicroelectronics is a 1.8 V, 3 A fixed-output low-dropout linear regulator in D2PAK 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 LD29300D2M18R datasheet, LD29300D2M18R pinout, LD29300D2M18R application, or LD29300D2M18R equivalent, key selection criteria include guaranteed 3 A output current, thermal/current protection, 60 µVRMS output noise (10 Hz–100 kHz), and compatibility with 10 µF ceramic output capacitors.

Technical Context

This LDO employs internal PNP pass transistor architecture with integrated thermal foldback and current limiting, enabling safe operation up to 125 °C junction temperature. Its reference voltage is trimmed during production to achieve ±1% initial accuracy, and line/load regulation remain within 0.5% across full operating conditions.

The device includes an inhibit (INH) input for logic-level ON/OFF control-low state disables output and reduces quiescent current to 130–180 µA, while high state enables regulation with 20–50 mA typical I_q at 1.5 A load. Dropout voltage is defined as the VI–VO differential at which VO drops to 99% of nominal.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	1.8 V ±1% at 25 °C; maintains regulation across –40 to +125 °C junction range
Max output current	3 A continuous; internally limited with thermal foldback above 125 °C
Dropout voltage	0.4 V typ. at 3 A; enables operation with only 2.2 V input for 1.8 V output
Quiescent current	20–50 mA at 1.5 A load; drops to 130–180 µA in shutdown mode
Supply rejection	62–72 dB at 120 Hz; suppresses ripple from upstream switching converters
Noise voltage	60 µV_RMS (10 Hz–100 kHz); suitable for noise-sensitive analog/RF subsystems
Logic control	Inhibit pin accepts 0.8 V low / 2 V high TTL-compatible thresholds for precise power sequencing

Pinout & Package

D2PAK (TO-263) thermally enhanced surface-mount package with exposed metal tab for PCB heatsinking; JEDEC MS-013AC compliant, ECOPACK® lead-free finish.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 2.5 V to 30 V DC; clamped to 14 V for automatic shutdown above threshold
2 (GND)	Ground reference	Common return for output, control, and internal circuitry; must be low-impedance
3 (OUT)	Regulated output	Delivers 1.8 V ±1% at up to 3 A; requires ≥10 µF ceramic capacitor for stability
4 (INH)	Inhibit control input	Active-low enable: <0.8 V disables output; >2 V enables regulation

Key Features

Feature	Design Value
Ultra-low dropout	0.4 V typ. at full 3 A load enables use in battery-powered systems down to 2.2 V input
High output accuracy	±1% initial tolerance ensures reliable core voltage compliance for 1.8 V logic families
Integrated protection	Thermal shutdown and current limiting prevent damage during overload or ambient rise
Low-noise regulation	60 µV_RMS broadband noise supports clean power for ADCs, PLLs, and RF front-ends
Logic-compatible enable	TTL/CMOS-compatible INH pin simplifies integration into power sequencing controllers

Applications

Processor Core Supply

Industrial PLC I/O Module

Use Scenario: Providing stable 1.8 V bias to ARM Cortex-A/M series CPU cores in embedded gateways.

IC Role / Device Role / Timing Role: Primary post-regulator converting 3.3 V intermediate rail to precision 1.8 V core voltage with fast transient response.

Use Value: 0.4 V dropout allows sustained operation during brown-out events; 60 µV_RMS noise prevents digital timing jitter.

Use Scenario: Powering isolated 1.8 V digital logic in programmable logic controller backplane modules.

IC Role / Device Role / Timing Role: Local point-of-load regulator delivering clean, sequenced 1.8 V to FPGA configuration banks and interface transceivers.

Use Value: INH pin enables synchronized power-up/down with system watchdog; ±1% tolerance guarantees logic-level compatibility.

Battery-Powered Test Equipment

Medical Sensor Signal Chain

Use Scenario: Supplying 1.8 V to microcontroller and precision DAC in handheld calibration tools.

IC Role / Device Role / Timing Role: Low-quiescent LDO maintaining runtime from single-cell Li-ion (2.8–4.2 V) while supporting 3 A peak loads.

Use Value: 130–180 µA shutdown current extends battery life; 0.4 V dropout maximizes usable cell voltage range.

Use Scenario: Biasing low-noise amplifiers and sigma-delta ADCs in portable ECG monitors.

IC Role / Device Role / Timing Role: Ultra-low-noise 1.8 V source decoupled from noisy digital sections via separate ground plane.

Use Value: 60 µV_RMS noise floor preserves signal integrity; thermal protection prevents drift during extended clinical use.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSM1083-1.8	0.35 V dropout at 3 A; 1.5% output tolerance; no inhibit pin	Lacks logic control; higher tolerance may require margining in tight-core-voltage designs	Preferred where minimal dropout is critical and sequencing is handled externally
TPS7A8300RGRT	0.5 V dropout at 3 A; 0.75% tolerance; 5.5 µV_RMS noise; adjustable output	Lower noise but requires external resistor divider; higher cost and board area	Selected when ultra-low noise dominates over fixed-voltage simplicity and cost

Compared with TSM1083-1.8 and TPS7A8300RGRT, LD29300D2M18R offers balanced performance: tighter 1% tolerance than TSM1083-1.8, built-in shutdown control absent in that part, and lower cost than TPS7A8300RGRT while delivering adequate 60 µV_RMS noise for most embedded applications.

Availability

LD29300D2M18R is available at Aetrix Electronics and suitable for industrial PLCs, battery-powered test equipment, medical sensor signal chains, and embedded processor core supplies requiring stable component supply with long-term lifecycle support.

Supply support for LD29300D2M18R 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, MCU, power, and MEMS products for industrial, automotive, and consumer markets.

The LD29300 series belongs to ST's high-current LDO portfolio, engineered specifically for post-regulation in power-constrained systems where ultra-low dropout, precision output, and robust thermal behavior are mandatory.

FAQ

What is the minimum input voltage required for LD29300D2M18R to regulate 1.8 V at 3 A?

The minimum input voltage is 2.2 V - calculated as 1.8 V output plus 0.4 V typical dropout. Absolute minimum specified is 2.5 V per Table 4, ensuring reliable startup and regulation across temperature and process variation. Operation below 2.5 V is not guaranteed.

Can LD29300D2M18R be used without the INH pin connected?

Yes - the INH pin is internally pulled up; leaving it unconnected defaults the device to enabled operation. However, for deterministic power sequencing, ST recommends tying INH to VI through a 10 kΩ resistor or actively driving it to avoid floating states during reset or low-power modes.

What output capacitor value and type are required for stability?

A minimum 10 µF ceramic capacitor (X5R/X7R, 6.3 V rating) is required on the OUT pin, placed as close as possible to pins 2 (GND) and 3 (OUT). Larger values improve transient response but do not affect stability. Aluminum or tantalum capacitors are not recommended due to ESR sensitivity.

Does LD29300D2M18R support parallel operation for higher current?

No - the device lacks current-sharing capability or master/slave control. Parallel connection risks thermal imbalance and potential failure due to mismatched dropout voltages. For >3 A requirements, select a higher-current LDO or switch to a DC-DC solution with appropriate current-sharing topology.

LD29300D2M18R 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):: 1.8V

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:: D2PAK-3

LD29300D2M18R FAQ

1.How can I place an order for LD29300D2M18R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD29300D2M18R 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 LD29300D2M18R reliable?

The price and inventory of LD29300D2M18R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29300D2M18R is usually 5 days.

3.What payment methods are accepted for LD29300D2M18R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29300D2M18R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD29300D2M18R?

LD29300D2M18R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD29300D2M18R 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 LD29300D2M18R?

For technical support, including LD29300D2M18R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29300D2M18R requirements.

6.How does Aetrix verify that LD29300D2M18R is sourced from the original manufacturer or authorized distributors?

All LD29300D2M18R 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 LD29300D2M18R meets industry standards.

7.What is the process for return or replacement of LD29300D2M18R?

All LD29300D2M18R units undergo pre-shipment inspection (PSI). If there is an issue with LD29300D2M18R, 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 LD29300D2M18R part is unused and in its original packaging.

Return procedure for LD29300D2M18R:

1.Submit a request within 90 days.

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

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