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

STMicroelectronics LD29300D2T18R

Name: LD29300D2T18R
Brand: STMicroelectronics
SKU: LD29300D2T18R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD29300D2T18R

Manufacturer:: STMicroelectronics

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

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: LD29300D2T18R.pdf

Description:: IC REG LINEAR 1.8V 3A D2PAK

Quantity:: RFQ Add To RFQ list

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Inventory:653

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Product details

Overview

LD29300D2T18R from STMicroelectronics is a fixed-output 1.8 V, 3 A 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 FPGA core supplies and microprocessor I/O rails where tight voltage stability and ultra-low dropout are critical.

For engineers reviewing the LD29300D2T18R datasheet, LD29300D2T18R pinout, LD29300D2T18R application, or LD29300D2T18R equivalent, key selection criteria include guaranteed 3 A output current, thermal/current protection, shutdown control interface, and compatibility with low-ESR ceramic output capacitors (≥10 µF).

Technical Context

This LDO employs internal PNP pass transistor architecture with integrated current limiting and thermal shutdown, enabling robust operation under sustained overload or elevated ambient temperatures. Its reference voltage is trimmed to ±1 % at 25 °C and exhibits <±2 % variation across –40 to 125 °C junction range.

The device features an inhibit (INH) input that enables logic-level ON/OFF control with 0.8 V logic-low threshold and 2 V logic-high threshold, supporting power sequencing in multi-rail systems. Output noise is specified at 60 µV_RMS (10 Hz–100 kHz), making it suitable for noise-sensitive analog and mixed-signal loads.

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 temperature
Max output current	3 A continuous; internally limited with foldback current protection
Dropout voltage	0.4 V typical at 3 A; ensures regulation with only 2.2 V input for 1.8 V output
Quiescent current	45–100 mA at 3 A load; scales with output current to minimize no-load loss
Supply rejection	62–72 dB at 120 Hz; suppresses ripple from upstream switching converters
Output noise	60 µV_RMS (10 Hz–100 kHz); low enough for powering PLLs and ADC references
Shutdown current	130–180 µA when INH = GND; enables ultra-low standby power in battery systems

Pinout & Package

LD29300D2T18R uses the D2PAK (TO-263) surface-mount package: 3-pin, single-ended, thermally enhanced plastic case with exposed drain pad for PCB heat sinking. Package dimensions comply with JEDEC MO-202AA standard and support ECOPACK® lead-free assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 (Input)	V_IN	Main power input; accepts 3–13 V DC; must be decoupled with ≥330 nF ceramic capacitor
2 (Output)	V_OUT	Regulated 1.8 V output; requires ≥10 µF low-ESR ceramic capacitor for stability
3 (Control)	INH	Inhibit input; logic-low (≤0.8 V) disables output; logic-high (≥2 V) enables regulation

Key Features

Feature	Design Value
Ultra-low dropout	0.4 V typ. at full 3 A load enables use with minimal input headroom (e.g., 2.2 V → 1.8 V)
High accuracy output	±1 % initial tolerance at 25 °C; <±2 % over full temperature range supports tight-core-voltage requirements
Integrated protection	Thermal shutdown and current limiting prevent damage during fault conditions without external circuitry
Logic-compatible enable	INH pin accepts standard 3.3 V/5 V logic levels for seamless integration into power sequencing controllers
Low-noise operation	60 µV_RMS broadband noise avoids degradation of sensitive analog subsystems powered from same rail

Applications

Application 1

Application 2

Use Scenario: Core power supply for Xilinx Spartan-6 FPGA banks requiring stable 1.8 V at up to 2.5 A.

IC Role / Device Role / Timing Role: Primary LDO regulator delivering clean, tightly regulated voltage to I/O banks with fast transient response.

Use Value: 0.4 V dropout allows direct regulation from 2.5 V intermediate bus, eliminating cascaded conversion losses.

Use Scenario: Post-regulator for buck converter supplying ARM Cortex-A9 processor I/O rails.

IC Role / Device Role / Timing Role: Final-stage LDO filtering switching noise and compensating for load-transient droop.

Use Value: 62–72 dB PSRR at 120 Hz suppresses residual ripple from upstream DC-DC stage.

Application 3

Application 4

Use Scenario: Power source for industrial PLC digital I/O modules operating from 12 V field bus.

IC Role / Device Role / Timing Role: High-current local regulator converting 12 V to 1.8 V for level-shifting interfaces and isolated logic.

Use Value: 3 A rating supports multiple parallel I/O drivers; thermal shutdown prevents latch-up in enclosed enclosures.

Use Scenario: Battery-powered test equipment requiring low-quiescent-power 1.8 V rail with remote ON/OFF control.

IC Role / Device Role / Timing Role: Enable-controlled LDO minimizing standby current while maintaining fast wake-up capability.

Use Value: 130–180 µA shutdown current extends battery life; INH pin simplifies MCU-driven power gating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Texas Instruments TPS7A8300RGRT	1.8 V, 3 A, 0.25 V dropout at 3 A; lower quiescent current (120 µA active, 2 µA shutdown); requires external compensation	Better suited for ultra-low-noise precision analog rails due to 4.5 µV_RMS noise; less tolerant of ceramic capacitor ESR variation	Select when lowest possible noise and highest PSRR (>80 dB) are required, and board space allows for external compensation network.
ON Semiconductor NCP1117DT18T5G	1.8 V, 1 A, 1.2 V dropout at 1 A; no enable pin; ±2 % output tolerance; TO-252 package	Limited to lower current and higher dropout; lacks logic control and thermal margin for sustained 3 A loads	Acceptable only for cost-sensitive, low-power applications where 1 A output and simplified control suffice.

Compared with TPS7A8300RGRT, LD29300D2T18R offers simpler layout (no external compensation), higher current rating, and integrated shutdown-but trades off noise performance and quiescent current. Against NCP1117DT18T5G, it provides triple the current, half the dropout, and system-level control-justifying its use in demanding embedded and industrial power designs.

Availability

LD29300D2T18R is available at Aetrix Electronics and suitable for FPGA power delivery, microprocessor I/O regulation, and industrial PLC I/O module design requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for LD29300D2T18R 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 belongs to ST's high-current LDO portfolio, engineered specifically for post-regulation in power-constrained systems where minimal dropout, high accuracy, and integrated protection are mandatory.

FAQ

What is the minimum input voltage required for LD29300D2T18R to maintain regulation at 3 A?

The minimum input voltage is calculated as V_OUT + V_DROP = 1.8 V + 0.4 V = 2.2 V. However, per Table 4, the absolute minimum operating input voltage is specified as 2.5 V across the full temperature range to guarantee stability and protection functionality under worst-case conditions.

Can LD29300D2T18R be used without the INH pin connected?

Yes. The INH pin is internally pulled up; leaving it unconnected defaults the device to enabled state. For reliable operation, ST recommends tying INH to V_IN via a 10 kΩ resistor if not actively controlled, avoiding floating inputs that could cause erratic enable behavior.

What output capacitor value and type are required for stability?

A minimum 10 µF low-ESR ceramic capacitor (X5R or X7R dielectric) is required on the output. ST specifies CO ≥ 10 µF with ESR ≤ 100 mΩ; larger values improve transient response but do not affect basic stability. Tantalum or aluminum electrolytic capacitors are not recommended due to higher ESR and reliability concerns.

How does thermal performance differ between D2PAK and TO-220 packages?

D2PAK has R_thJC = 3 °C/W (same as TO-220), but R_thJA = 60 °C/W vs. 50 °C/W for TO-220. This means D2PAK relies more heavily on PCB copper area for heatsinking. With ≥4 cm² of 2-oz copper connected to the exposed pad, D2PAK achieves comparable thermal performance to TO-220 in compact SMT layouts.

LD29300D2T18R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

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

LD29300D2T18R FAQ

1.How can I place an order for LD29300D2T18R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD29300D2T18R 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 LD29300D2T18R reliable?

The price and inventory of LD29300D2T18R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29300D2T18R is usually 5 days.

3.What payment methods are accepted for LD29300D2T18R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29300D2T18R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD29300D2T18R?

LD29300D2T18R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD29300D2T18R 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 LD29300D2T18R?

For technical support, including LD29300D2T18R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29300D2T18R requirements.

6.How does Aetrix verify that LD29300D2T18R is sourced from the original manufacturer or authorized distributors?

All LD29300D2T18R 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 LD29300D2T18R meets industry standards.

7.What is the process for return or replacement of LD29300D2T18R?

All LD29300D2T18R units undergo pre-shipment inspection (PSI). If there is an issue with LD29300D2T18R, 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 LD29300D2T18R part is unused and in its original packaging.

Return procedure for LD29300D2T18R:

1.Submit a request within 90 days.

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

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