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

STMicroelectronics LD1084V

Name: LD1084V
Brand: STMicroelectronics
SKU: LD1084V
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD1084V

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: LD1084V.pdf

Description:: IC REG LINEAR POS ADJ 5A TO220

Quantity:: RFQ Add To RFQ list

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Inventory:2,081

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Product details

Overview

LD1084V from STMicroelectronics is a 5 A low-dropout positive adjustable voltage regulator in TO-220 package, featuring ±1% output voltage tolerance at 25 °C, 1.3 V typical dropout at full load, and internal thermal/overcurrent protection. It delivers stable DC power for industrial motor drives, telecom power supplies, and embedded system auxiliary rails.

For engineers reviewing the LD1084V datasheet, LD1084V pinout, LD1084V application, or LD1084V equivalent, key selection criteria include dropout voltage at 5 A, adjust pin current drift (≤5 µA over load/temperature), minimum 10 µF output capacitance requirement, and TO-220 thermal resistance (R_thJC = 3 °C/W).

Technical Context

The LD1084V uses an NPN-based pass transistor architecture-unlike PNP regulators-so quiescent current flows into the load, improving efficiency. Its reference voltage is trimmed on-chip to 1.25 V (±1% at 25 °C), enabling precise external resistor-set output voltages via the ADJ pin.

It operates across –40 °C to +125 °C junction temperature with guaranteed 5 A output current, internally limited short-circuit current (5.5–6.5 A at 5 V dropout), and supply voltage rejection of 60–72 dB at 120 Hz. Stability requires ≥10 µF tantalum output capacitor.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	Up to 5 A continuous; enables single-regulator power for high-current analog or digital subsystems
Dropout voltage	1.3 V typ. at 5 A; allows operation with ≤1.5 V headroom above output, critical for 3.3 V or 5 V systems fed from 5 V or 12 V rails
Reference voltage	1.25 V ±1% at 25 °C; sets tight output accuracy when used with precision external resistors (e.g., VO = 1.25 × (1 + R1/R2))
Line regulation	0.035% max. over VI = 2.85–16.5 V; ensures <±5 mV output shift across input ripple or variation
Load regulation	0.4% max. over 0–5 A; maintains <±20 mV output deviation during full-load transients
Thermal resistance	R_thJC = 3 °C/W; supports >3 W dissipation with minimal heatsink when mounted to PCB copper plane
Adjust pin current	55–120 µA at 10 mA load; low and stable, minimizing error in feedback network design

Pinout & Package

Supplied in TO-220 package with standard 3-pin vertical mounting configuration and electrically isolated tab (connected to Output). Thermal performance optimized for PCB copper pour attachment.

Pin/Terminal	Circuit Role	Design Meaning
Input (IN)	Unregulated DC input supply	Accepts up to 30 V DC; must be ≥ (VO + Vd) to maintain regulation under full load
Output (OUT)	Regulated DC output	Delivers set voltage to load; connects directly to heatsink tab for thermal conduction
Adjust (ADJ)	Feedback reference node	Connects to voltage divider (R1–R2); senses 1.25 V reference to set VO = 1.25 × (1 + R1/R2)

Key Features

Feature	Design Value
NPN pass transistor topology	Directs quiescent current into load instead of ground, increasing conversion efficiency by ~0.5–1% at 5 A
On-chip voltage reference trimming	Enables ±1% output tolerance at 25 °C without external calibration, reducing BOM count and test time
Internal thermal shutdown	Automatically disables output above T_J = 150 °C, preventing damage during overload or poor heatsinking
Guaranteed 5 A output current	Validated across full temperature range (–40 °C to +125 °C), supporting industrial-grade reliability without derating
Low-output-noise design	0.003% RMS noise (relative to VO) over 10 Hz–10 kHz, suitable for noise-sensitive analog circuitry

Applications

Industrial Motor Drives

Telecom Power Supplies

Use Scenario: Powering gate drivers, op-amps, and MCU peripherals in 24 V or 48 V motor control inverters.

IC Role / Device Role / Timing Role: Adjustable LDO providing clean, stable 3.3 V or 5 V bias rails independent of main DC bus ripple.

Use Value: 1.3 V dropout enables regulation from 24 V bus even during brownout; ±1% tolerance ensures ADC reference stability.

Use Scenario: Generating intermediate 5 V or 12 V rails in distributed power architectures for base station RF modules.

IC Role / Device Role / Timing Role: Secondary regulator delivering low-noise, high-current bias to RF amplifiers and clock buffers.

Use Value: 0.003% RMS noise and 72 dB SVR suppress switching noise from upstream DC/DC converters.

Embedded System Auxiliary Rails

Test & Measurement Equipment

Use Scenario: Supplying FPGA I/O banks, DDR termination, and sensor interfaces in ruggedized edge controllers.

IC Role / Device Role / Timing Role: High-current adjustable LDO replacing multiple fixed regulators to simplify BOM and layout.

Use Value: Pin-to-pin compatibility with legacy LM317 simplifies redesign; TO-220 mountability supports manual rework.

Use Scenario: Providing calibrated ±15 V and +5 V rails for precision op-amp stages and DAC reference buffers.

IC Role / Device Role / Timing Role: Precision-adjustable voltage source with tight line/load regulation for metrology-grade signal conditioning.

Use Value: 0.035% line regulation and 0.4% load regulation ensure <±10 mV output shift across instrument operating range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM317T	Lower current (1.5 A), higher dropout (2 V min.), ±2% Vref tolerance, no thermal shutdown	Lacks internal protection and thermal margin for sustained 5 A loads; requires larger heatsink	Select when cost sensitivity outweighs current/headroom requirements and external protection is acceptable
LT1084-CT	Same 5 A rating and TO-220 package, but ±1.5% Vref tolerance and higher quiescent current (100 µA vs. 55–120 µA)	Slightly lower output accuracy and higher ADJ pin error contribution in precision feedback networks	Prefer when sourcing from Analog Devices' distribution channels or requiring LT-specific support documentation

Compared with LM317T and LT1084-CT, the LD1084V offers superior output accuracy (±1% vs. ±2%/±1.5%), lower dropout (1.3 V vs. ≥2 V / 1.4 V), and integrated thermal protection-making it optimal for space-constrained, high-reliability industrial designs where regulation headroom and long-term stability are critical.

Availability

LD1084V is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and embedded system auxiliary rails requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.

Supply support for LD1084V 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 microcontrollers, power management ICs, sensors, and automotive-grade components since 1987.

The LD1084V belongs to ST's high-current linear regulator product line, engineered specifically for industrial and telecom applications demanding robust thermal behavior, tight output tolerance, and reliable operation across extended temperature ranges.

FAQ

What is the minimum output capacitance required for LD1084V stability?

The LD1084V requires a minimum 10 µF tantalum capacitor at the output for guaranteed stability across all operating conditions. Aluminum or ceramic capacitors may be used only if their effective series resistance (ESR) falls within 0.1–1 Ω and total capacitance meets or exceeds 10 µF with appropriate derating.

Can LD1084V be used in parallel for higher current?

No-LD1084V is not designed for parallel operation. Its output voltage tolerance and load regulation characteristics prevent balanced current sharing. For >5 A requirements, use a single higher-current regulator or switch-mode solution instead of paralleling multiple LD1084Vs.

Is the TO-220 tab electrically isolated?

Yes-the TO-220 package used for LD1084V has an electrically isolated tab connected internally to the Output (OUT) pin. This allows direct mechanical mounting to a heatsink without requiring insulating hardware, provided the heatsink remains at output potential.

How does quiescent current behave under no-load conditions?

At zero load, LD1084V draws approximately 10 mA quiescent current, which flows entirely into the load path (not ground), maintaining efficiency. This value increases slightly with input voltage and temperature but remains below 15 mA across the full –40 °C to +125 °C range.

LD1084V Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Adjustable

Number of Regulators:: 1

Voltage - Input (Max):: 30V

Voltage - Output (Min/Fixed):: 1.25V

Voltage - Output (Max):: 28.5V

Voltage Dropout (Max):: 1.5V @ 5A

Current - Output:: 5A

Current - Quiescent (Iq):: 10 mA

Current - Supply (Max):: -

PSRR:: 72dB (120Hz)

Control Features:: -

Protection Features:: Over Temperature, Short Circuit

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

LD1084V FAQ

1.How can I place an order for LD1084V through Aetrix?

Please submit a Request for Quotation (RFQ) for LD1084V 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 LD1084V reliable?

The price and inventory of LD1084V are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1084V is usually 5 days.

3.What payment methods are accepted for LD1084V?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1084V transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD1084V?

LD1084V orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD1084V 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 LD1084V?

For technical support, including LD1084V datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1084V requirements.

6.How does Aetrix verify that LD1084V is sourced from the original manufacturer or authorized distributors?

All LD1084V 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 LD1084V meets industry standards.

7.What is the process for return or replacement of LD1084V?

All LD1084V units undergo pre-shipment inspection (PSI). If there is an issue with LD1084V, 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 LD1084V part is unused and in its original packaging.

Return procedure for LD1084V:

1.Submit a request within 90 days.

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

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