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

STMicroelectronics LD39080DT12-R

Name: LD39080DT12-R
Brand: STMicroelectronics
SKU: LD39080DT12-R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39080DT12-R

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LD39080DT12-R.pdf

Description:: IC REG LINEAR 1.22V 800MA DPAK

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Inventory:4,732

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Product details

Overview

LD39080DT12-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 adjustable output from 1.22 V to 5.0 V. It operates from 2.5 V to 6 V input and supports microprocessor and DSP power supply applications requiring low noise and fast transient response.

For engineers reviewing the LD39080DT12-R datasheet, LD39080DT12-R pinout, LD39080DT12-R application, or LD39080DT12-R equivalent, this page provides verified electrical specs, PPAK package details, thermal performance data, shutdown control behavior, and real-world stability requirements for ceramic output capacitors.

Technical Context

The LD39080DT12-R uses a BiCMOS process enabling ultra-low quiescent current (1 mA typ. at 0.8 A load) independent of output current, unlike standard CMOS LDOs. Its error amplifier references a stable 1.22 V internal bandgap and supports external resistor feedback for precise output adjustment.

It integrates logic-controlled electronic shutdown (inhibit pin), internal current limiting (1.6 A short-circuit protection), and thermal shutdown (170 °C trip with 10 °C hysteresis). Stability is guaranteed with ≥2.2 µF ceramic output capacitor and proper ESR range per ST's CO vs. ESR chart.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	0.8 A guaranteed - supports high-current digital loads like microprocessors without derating at 125 °C junction.
Dropout Voltage	150 mV typ. @ 0.8 A - enables regulation from 3.3 V input to 3.15 V output, critical for low-voltage core rails.
Quiescent Current	1 mA typ. @ 0.8 A load - minimizes standby power loss in always-on subsystems.
Output Voltage Tolerance	±1.5% @ 25 °C - ensures accurate voltage delivery for sensitive analog/digital mixed-signal circuits.
Input Voltage Range	2.5 V to 6 V - compatible with Li-ion battery, 3.3 V/5 V system rails, and post-regulation after buck converters.
Operating Temperature	–40 °C to +125 °C - qualified for automotive under-hood and industrial embedded environments.
Noise Voltage	100 µV_RMS (10 Hz–100 kHz) - low enough for RF-sensitive analog supplies and ADC reference domains.

Pinout & Package

LD39080DT12-R is housed in a thermally enhanced PPAK-5 (5-lead Power Package) with exposed thermal pad. The package supports high-power dissipation (R_thJC = 8 °C/W) and surface-mount reflow assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 VINH	Inhibit control input	Logic-high (≥2 V) enables output; logic-low (≤0.3 V) disables regulator and reduces I_Q to ≤1 µA - requires external pull-up if unused.
2 VI	Main input voltage	Accepts 2.5–6 V DC; requires 1 µF ceramic capacitor placed ≤1 cm away to suppress high-frequency noise and ensure stability.
3 GND	Analog ground reference	Common return path for input/output capacitors and feedback network; must be low-impedance and separate from power ground traces.
4 VO	Regulated output	Delivers adjustable output (1.22–5.0 V); requires ≥2.2 µF ceramic capacitor with specified ESR range for loop stability.
5 ADJ	Feedback reference node	Connects to resistor divider (R1/R2) to set output voltage per V_O = 1.22 V × (1 + R1/R2); not present on fixed-output variants.

Key Features

Feature	Design Value
Ultra-low dropout	150 mV @ 0.8 A enables operation with minimal headroom - extends battery runtime in portable systems.
BiCMOS process architecture	Maintains 1 mA quiescent current across full 0–0.8 A load range - eliminates efficiency penalty at light loads.
Stable with ceramic capacitors	Validated for ≥2.2 µF X7R/X5R ceramics - reduces board space and cost vs. tantalum/electrolytic alternatives.
Fast dynamic response	Load/line transients settle within microseconds - prevents brownout during CPU burst activity.
Integrated protection	Thermal shutdown (170 °C), current limit (1.6 A), and inhibit control - eliminates need for external supervision circuitry.

Applications

Mobile Application Processor Core Supply

DSP-Based Audio Signal Chain

Use Scenario: Powering ARM Cortex-A series cores operating at 1.0–1.2 V with dynamic DVFS scaling.

IC Role / Device Role / Timing Role: Primary low-noise post-regulator supplying CPU VDD_CORE rail after a switching DC-DC stage.

Use Value: 100 µV_RMS noise and fast load transient response prevent digital glitches and timing violations during frequency transitions.

Use Scenario: Providing clean 3.3 V bias to stereo audio codec and ADC/DAC in portable music players.

IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from noisy digital domains.

Use Value: ±1.5% output tolerance and <150 mV dropout preserve SNR and THD+N performance across battery discharge cycle.

Automotive Camera Module Power

Industrial PLC I/O Channel Regulator

Use Scenario: Delivering 2.8 V to CMOS image sensor and ISP in ADAS front/rear cameras.

IC Role / Device Role / Timing Role: High-reliability linear regulator meeting AEC-Q100 Grade 2 (–40 °C to +105 °C ambient) requirements.

Use Value: –40 °C to +125 °C junction rating and integrated thermal shutdown ensure safe operation in sealed, convection-limited enclosures.

Use Scenario: Generating isolated 5.0 V rail for analog sensor signal conditioning and isolated CAN transceiver bias.

IC Role / Device Role / Timing Role: Post-regulator following isolated DC-DC converter to reject switching noise and improve EMC immunity.

Use Value: 65 dB PSRR at 120 Hz and 55 dB at 1 kHz suppresses ripple from upstream flyback or forward converters.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B122MR-G	0.5 A max output, 250 mV dropout @ 0.5 A, 1.22 V reference, SOT-25 package	Limited to lower-current peripherals; lacks inhibit pin and thermal shutdown	Select when board space is constrained and thermal safety margin is managed externally.
ON Semiconductor NCP1117DT33T5G	Fixed 3.3 V output only, 1.2 A current, 1.2 V dropout min, SOT-223 package	Not adjustable; higher dropout limits use with low-input-voltage sources	Choose for cost-sensitive fixed-rail designs where adjustability and ultra-low dropout are unnecessary.

Compared with XC6210B122MR-G and NCP1117DT33T5G, LD39080DT12-R uniquely combines 0.8 A capability, 150 mV dropout, adjustable output, and integrated inhibit/thermal protection in a thermally optimized PPAK package - making it optimal for compact, high-performance embedded power nodes.

Availability

LD39080DT12-R is available at Aetrix Electronics and suitable for microprocessor power supply, DSP power supply, post-regulators for switching supplies, and high-efficiency linear regulator applications requiring stable component supply across automotive, industrial, and consumer design cycles.

Supply support for LD39080DT12-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 silicon solutions for automotive, industrial, and smart power applications since 1987.

The LD39080 belongs to ST's high-performance LDO regulator product line, engineered specifically for low-noise, low-dropout power delivery in battery-powered and thermally constrained embedded systems.

FAQ

What is the minimum output capacitance required for stability?

The LD39080DT12-R requires a minimum 2.2 µF ceramic output capacitor with ESR between 5 mΩ and 100 mΩ for guaranteed stability across temperature and load. ST provides CO vs. ESR charts in Figures 15–16 of the datasheet to validate capacitor selection for specific operating conditions.

Can the inhibit (VINH) pin be left unconnected?

No - the VINH pin must never be left floating, as it has no internal pull-up or pull-down. If shutdown functionality is unused, VINH must be tied directly to VI (input voltage) to maintain continuous operation. Leaving it open risks unpredictable enable/disable behavior and potential device malfunction.

Is the LD39080DT12-R pin-compatible with other ST LDOs in PPAK-5?

No - LD39080DT12-R uses a unique 5-pin PPAK layout (VINH, VI, GND, VO, ADJ) optimized for adjustable operation. Fixed-output variants like LD39050 use different pin assignments (e.g., no ADJ pin), and other ST PPAK-5 regulators (e.g., STLQ015) have distinct pin functions and thermal pad configurations.

Does the device require an input capacitor, and what type is recommended?

Yes - a minimum 1 µF ceramic input capacitor is mandatory and must be placed ≤1 cm from the VI pin with direct connection to GND. X7R or X5R dielectrics are recommended for stable capacitance over temperature and voltage. Larger values improve high-frequency PSRR but do not affect stability criteria.

LD39080DT12-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):: 1.22V

Voltage - Output (Max):: -

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

Current - Output:: 800mA

Current - Quiescent (Iq):: 2.5 mA

Current - Supply (Max):: -

PSRR:: -

Control Features:: Enable

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

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

LD39080DT12-R FAQ

1.How can I place an order for LD39080DT12-R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39080DT12-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 LD39080DT12-R reliable?

The price and inventory of LD39080DT12-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39080DT12-R is usually 5 days.

3.What payment methods are accepted for LD39080DT12-R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39080DT12-R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39080DT12-R?

LD39080DT12-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39080DT12-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 LD39080DT12-R?

For technical support, including LD39080DT12-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39080DT12-R requirements.

6.How does Aetrix verify that LD39080DT12-R is sourced from the original manufacturer or authorized distributors?

All LD39080DT12-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 LD39080DT12-R meets industry standards.

7.What is the process for return or replacement of LD39080DT12-R?

All LD39080DT12-R units undergo pre-shipment inspection (PSI). If there is an issue with LD39080DT12-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 LD39080DT12-R part is unused and in its original packaging.

Return procedure for LD39080DT12-R:

1.Submit a request within 90 days.

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

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