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

STMicroelectronics LD39080DT18-R

Name: LD39080DT18-R
Brand: STMicroelectronics
SKU: LD39080DT18-R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39080DT18-R

Manufacturer:: STMicroelectronics

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

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: LD39080DT18-R.pdf

Description:: IC REG LINEAR 1.8V 800MA DPAK

Quantity:: RFQ Add To RFQ list

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Inventory:4,463

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Product details

Overview

LD39080DT18-R from STMicroelectronics is an ultra-low-dropout BiCMOS linear voltage regulator delivering 0.8 A output current with 150 mV typical dropout at full load, ±1.5% output voltage tolerance at 25 °C, and 1 µA max shutdown current. It operates from 2.5 V to 6 V input, supports adjustable output (1.22–5.0 V), and is optimized for microprocessor and DSP core power in automotive and industrial embedded systems.

For engineers reviewing the LD39080DT18-R datasheet, LD39080DT18-R pinout, LD39080DT18-R application, or LD39080DT18-R equivalent, key selection criteria include dropout voltage under 200 mV at 0.8 A, thermal shutdown at 170 °C, stability with 2.2 µF ceramic output capacitor, and logic-controlled inhibit functionality with 0.3 V/2 V thresholds.

Technical Context

The LD39080DT18-R implements a BiCMOS-based error amplifier and pass transistor architecture enabling ultra-low quiescent current (1 mA typ. at 0.8 A) independent of load. Its internal current and thermal limiting protect against overload and junction overheating up to 170 °C.

It features fast transient response to line and load steps, 65 dB supply voltage rejection at 120 Hz, and stable operation with low-ESR ceramic capacitors-enabled by internal compensation tuned for CO ≥ 2.2 µF and ESR < 100 mΩ.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	0.8 A guaranteed - supports high-current digital core rails without external boost
Dropout voltage	150 mV typ. @ 0.8 A - enables regulation from 3.3 V input to 3.15 V output with margin
Quiescent current	1 mA typ. @ 0.8 A, 1 µA max. off - minimizes standby power in battery-backed systems
Output voltage tolerance	±1.5% @ 25 °C - ensures reliable logic-level compliance for 3.3 V or 2.5 V I/O domains
Operating temperature	−40 to +125 °C - qualified for under-hood automotive and industrial control environments
Supply rejection	65 dB @ 120 Hz - suppresses ripple from upstream switching regulators in hybrid power architectures
Shutdown threshold	VINH ≤ 0.3 V turns off regulator - compatible with standard GPIO logic-low levels

Pinout & Package

LD39080DT18-R is housed in a thermally enhanced PPAK-5 (5-pin Power Package) with exposed thermal pad. The package provides R_thJC = 8 °C/W for efficient heat transfer to PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
1 VINH	Inhibit control input	Active-low enable: ≤0.3 V disables regulator; ≥2 V enables; must not float
2 VI	Input voltage supply	Accepts 2.5–6 V; requires 1 µF ceramic cap within 1 cm for stability
3 GND	Power ground reference	Common return for input/output paths and thermal pad connection
4 VO	Regulated output	Delivers adjustable voltage; requires ≥2.2 µF ceramic cap with ESR < 100 mΩ
5 ADJ	Feedback reference node	Sets output via resistor divider; V_REF = 1.22 V; connects to VO through R1/R2 network

Key Features

Feature	Design Value
Ultra-low dropout	150 mV @ 0.8 A enables use with tight input-output margins in multi-rail systems
Ceramic capacitor stability	Stable with ≥2.2 µF X7R/X5R ceramics - eliminates need for tantalum or electrolytic caps
Logic-controlled shutdown	VINH pin accepts standard CMOS/TTL levels - simplifies integration with host MCU GPIO
Fast dynamic response	Load/line transients settled in <15 µs - maintains core voltage during burst-mode processor activity
Thermal protection	Auto-shutdown at 170 °C junction with 10 °C hysteresis - prevents permanent damage during sustained overload

Applications

Automotive Infotainment SoC Power

Industrial PLC FPGA Core Supply

Use Scenario: Powers ARM Cortex-A series application processors in head-unit designs requiring clean 1.2 V or 1.8 V core rails.

IC Role / Device Role / Timing Role: Post-regulator for buck converter outputs; provides low-noise, low-ripple bias for sensitive digital cores.

Use Value: 100 µV_RMS output noise and 65 dB SVR ensure signal integrity and reduce bit-error rates in high-speed interfaces.

Use Scenario: Supplies 1.2 V core voltage to Xilinx Spartan-7 FPGA in programmable logic controllers operating at −40 to +85 °C ambient.

IC Role / Device Role / Timing Role: Primary linear regulator for FPGA VCCINT rail; enabled/disabled via system controller GPIO.

Use Value: 1 µA shutdown current extends backup battery life during firmware updates or safe-state hold.

Medical Imaging Sensor Interface

5G Small Cell Baseband ASIC Supply

Use Scenario: Delivers 2.5 V analog supply to high-resolution ADC front-ends in portable ultrasound equipment.

IC Role / Device Role / Timing Role: Low-noise LDO for precision analog signal chain; decouples digital switching noise from sensor path.

Use Value: 150 mV dropout allows operation from 3.3 V intermediate rail while maintaining >100 mV headroom across temperature.

Use Scenario: Provides 1.0 V core voltage to Intel/Broadcom baseband ASICs in outdoor small cell radios with thermal cycling.

IC Role / Device Role / Timing Role: High-reliability linear regulator with thermal shutdown and current limit for mission-critical RF subsystems.

Use Value: −40 to +125 °C qualification and 8 °C/W R_thJC support continuous operation at 70 °C ambient with 2-layer PCB copper pour.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSM10803DCQRT	0.5 A output, 200 mV dropout @ 0.5 A, fixed 3.3 V output only	Lacks adjustability and 0.8 A capability; suited for lower-power I/O rails	Select when fixed 3.3 V and reduced thermal load are acceptable trade-offs
MCP1826T-1802E/DB	0.8 A output, 350 mV dropout @ 0.8 A, ±2% tolerance, no inhibit pin	No logic shutdown; higher dropout limits usable input range in low-voltage systems	Choose where shutdown control is unnecessary and 1.8 V fixed output suffices

Compared with TSM10803DCQRT and MCP1826T-1802E/DB, LD39080DT18-R uniquely combines 0.8 A current, sub-200 mV dropout, adjustable output, and active-low inhibit-making it optimal for space-constrained, thermally demanding, and dynamically controlled embedded power rails.

Availability

LD39080DT18-R is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, and medical imaging devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LD39080DT18-R 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 analog components for automotive, industrial, and consumer markets.

The LD39080 belongs to ST's high-performance LDO family engineered for low-noise, high-current post-regulation in mixed-signal systems where efficiency, thermal robustness, and supply rejection are critical.

FAQ

What is the minimum output capacitance required for stability?

The LD39080DT18-R requires a minimum 2.2 µF ceramic output capacitor with ESR below 100 mΩ for guaranteed stability across temperature and load. Lower ESR values extend the stable capacitance range downward per Figure 15–16 in the datasheet, but 2.2 µF is the validated baseline for all operating conditions.

Does LD39080DT18-R support fixed-output configurations?

No-LD39080DT18-R is the adjustable version (ADJ) with V_REF = 1.22 V and output set via external resistor divider. Fixed-output variants like LD39080PT-R exist but differ in part number and pinout; this device uses the ADJ pin (Pin 5) for feedback and has no internal resistor network.

Can the inhibit pin be left unconnected?

No-the VINH pin (Pin 1) must never be left floating. It has no internal pull-up or pull-down. To enable continuous operation, tie VINH directly to VI. To disable, drive it to ≤0.3 V using a GPIO or open-drain driver; failure to bias this pin risks undefined regulator state and potential shoot-through.

Is thermal derating required above 85 °C ambient?

Yes-while rated for −40 to +125 °C junction temperature, ambient derating depends on PCB copper area and airflow. With 2-layer 1 oz Cu and no forced air, output current must be reduced above 70 °C ambient to maintain T_J < 125 °C, based on R_thJA = 100 °C/W and power dissipation calculations per Section 4 of the datasheet.

LD39080DT18-R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 6V

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

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.3V @ 800mA

Current - Output:: 800mA

Current - Quiescent (Iq):: 2.5 mA

Current - Supply (Max):: -

PSRR:: -

Control Features:: -

Protection Features:: Over Current, Over Temperature, Short Circuit

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

LD39080DT18-R FAQ

1.How can I place an order for LD39080DT18-R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39080DT18-R 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 LD39080DT18-R reliable?

The price and inventory of LD39080DT18-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39080DT18-R is usually 5 days.

3.What payment methods are accepted for LD39080DT18-R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39080DT18-R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39080DT18-R?

LD39080DT18-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39080DT18-R 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 LD39080DT18-R?

For technical support, including LD39080DT18-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39080DT18-R requirements.

6.How does Aetrix verify that LD39080DT18-R is sourced from the original manufacturer or authorized distributors?

All LD39080DT18-R 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 LD39080DT18-R meets industry standards.

7.What is the process for return or replacement of LD39080DT18-R?

All LD39080DT18-R units undergo pre-shipment inspection (PSI). If there is an issue with LD39080DT18-R, 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 LD39080DT18-R part is unused and in its original packaging.

Return procedure for LD39080DT18-R:

1.Submit a request within 90 days.

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

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