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

STMicroelectronics LD39080PT25-R

Name: LD39080PT25-R
Brand: STMicroelectronics
SKU: LD39080PT25-R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39080PT25-R

Manufacturer:: STMicroelectronics

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

Package:: TO-252-5, DPAK (4 Leads + Tab), TO-252AD

Datasheet:: LD39080PT25-R.pdf

Description:: IC REG LINEAR 2.5V 800MA PPAK

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Inventory:4,871

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Product details

Overview

LD39080PT25-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 fast transient response and ceramic-capacitor stability.

For engineers reviewing the LD39080PT25-R datasheet, LD39080PT25-R pinout, LD39080PT25-R application, or LD39080PT25-R equivalent, key selection criteria include guaranteed 0.8 A output, 1 µA off-mode quiescent current, logic-controlled shutdown, thermal/current protection, and PPAK package thermal performance (R_thJC = 8 °C/W).

Technical Context

The LD39080PT25-R implements a BiCMOS-based error amplifier and pass transistor architecture enabling ultra-low quiescent current independent of load-1 mA typ. at 0.8 A, 1 µA max. in shutdown. Its ADJ pin configures output via external resistor divider, referencing a stable 1.22 V internal bandgap.

It features fast dynamic response to line/load transients, stable operation with ≥2.2 µF ceramic output capacitance, and integrated protection including thermal shutdown (170 °C trip), current limiting (~1.6 A short-circuit), and inhibit-controlled enable/disable with defined VIH/VIL thresholds (2 V / 0.3 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	0.8 A guaranteed-supports high-current low-voltage digital loads without derating at T_J ≤ 125 °C.
Dropout voltage	150 mV typ. @ 0.8 A-enables regulation from 2.5 V input to 2.35 V output, critical for battery-powered systems.
Quiescent current	1 µA max. in off mode-minimizes standby power loss in always-on subsystems.
Output voltage accuracy	±1.5% @ 25 °C-ensures reliable core voltage margin for 3.3 V/2.5 V/1.8 V microprocessor rails.
Input voltage range	2.5 V to 6 V-compatible with single-cell Li-ion, USB, and post-regulation of buck converters.
Operating temperature	−40 °C to +125 °C junction-validated for automotive under-hood and industrial control environments.
Supply rejection	65 dB @ 120 Hz-suppresses ripple from upstream switching regulators in hybrid power architectures.

Pinout & Package

LD39080PT25-R is housed in a thermally enhanced PPAK-5 (5-lead Power Package) with exposed thermal pad for PCB heat sinking. Package dimensions: 6.0 × 6.4 × 1.0 mm (L × W × H), R_thJA = 100 °C/W, R_thJC = 8 °C/W.

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	Input voltage supply	Accepts 2.5–6 V DC; requires 1 µF ceramic capacitor placed ≤1 cm from pin to minimize input impedance and EMI.
3 GND	Analog/digital ground reference	Common return path for input/output capacitors and feedback network-must connect directly to thermal pad and low-impedance ground plane.
4 VO	Regulated output voltage	Delivers adjustable output (1.22–5.0 V); requires ≥2.2 µF ceramic capacitor with ESR < 100 mΩ for stability per Figure 15–16.
5 ADJ	Feedback reference node	Connects to resistor divider (R1/R2) to set VO = 1.22 V × (1 + R1/R2); sensitive to noise-route away from switching nodes.

Key Features

Feature	Design Value
Ultra-low dropout	150 mV @ 0.8 A enables >95% efficiency at 3.3 V output from 3.6 V Li-ion, extending battery runtime.
Ceramic-capacitor stability	Stable with ≥2.2 µF X7R/X5R ceramics-eliminates need for bulkier, higher-ESR tantalum or aluminum electrolytics.
BiCMOS process	Enables 1 mA quiescent current at full 0.8 A load-reduces self-heating and improves PSRR vs. bipolar LDOs.
Fast transient response	Load step recovery within 15 µs (TD-ON/TD-OFF)-maintains voltage margin during CPU burst-mode operation.
Integrated protection	Thermal shutdown (170 °C), current limit (~1.6 A), and reverse-current blocking prevent damage during fault conditions.

Applications

Mobile Application Processor Core Supply

DSP-Based Audio Signal Chain

Use Scenario: Powering ARM Cortex-A series cores requiring 1.0–1.2 V at up to 0.8 A with tight voltage tolerance and low noise.

IC Role / Device Role / Timing Role: Primary low-noise post-regulator converting 1.8 V buck output to precise core voltage; handles rapid load transients during instruction execution.

Use Value: 100 µV_RMS output noise and 65 dB SVR suppress switching ripple from upstream DC/DC, preserving ADC/DAC SNR.

Use Scenario: Providing clean 3.3 V bias to audio codec and high-speed serial interface in portable soundbars and smart speakers.

IC Role / Device Role / Timing Role: Low-ESR ceramic-stable LDO isolating analog audio section from noisy digital domain; enables simultaneous playback/recording.

Use Value: 15 µs transient recovery time prevents audible pop/click artifacts during buffer underrun or sample-rate changes.

Automotive Body Control Module (BCM)

Industrial PLC I/O Channel Regulator

Use Scenario: Supplying 5.0 V to CAN transceivers and microcontroller peripherals in under-hood modules operating at −40 °C to +125 °C.

IC Role / Device Role / Timing Role: High-reliability linear regulator with thermal shutdown and wide-temp tolerance-replaces discrete solutions in space-constrained enclosures.

Use Value: Guaranteed 0.8 A output and ±3% total voltage tolerance over full temp range ensure CAN bus compliance across environmental stress tests.

Use Scenario: Generating isolated 2.5 V reference for 16-bit ADC front-end in programmable logic controller analog input cards.

IC Role / Device Role / Timing Role: Precision-adjustable LDO with 1.22 V reference and ±1.5% initial accuracy-used as calibration reference source.

Use Value: 1.22 V bandgap reference stability (±10 ppm/°C) enables <0.1% gain drift over temperature without external trimming.

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 XC6210B332MR-G	0.5 A output, 200 mV dropout @ 0.5 A, 1.2 V fixed output only-no ADJ pin.	Limited to fixed-output use cases; lacks programmability and full 0.8 A capability.	Select when cost sensitivity outweighs adjustability and current headroom needs.
ROHM BD3985FVM-CE2	0.8 A output, 180 mV dropout @ 0.8 A, 1 µA shutdown current-but requires minimum 10 µF output capacitor.	Higher ESR sensitivity limits ceramic capacitor flexibility; less suitable for space-constrained designs.	Prefer when legacy board layout already includes large tantalum output caps and thermal budget allows higher dropout.

Compared with XC6210B332MR-G and BD3985FVM-CE2, LD39080PT25-R uniquely combines 0.8 A adjustability, 150 mV dropout, 1 µA shutdown, and ceramic-capacitor compatibility-making it optimal for next-gen portable and automotive power rails where size, efficiency, and precision intersect.

Availability

LD39080PT25-R is available at Aetrix Electronics and suitable for microprocessor power supply, DSP power supply, and post-regulators for switching supplies requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability validation.

Supply support for LD39080PT25-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 consumer markets since 1987.

The LD39080 belongs to ST's high-performance LDO portfolio targeting low-power, high-accuracy power management in battery-operated and thermally constrained systems-designed specifically for core voltage regulation in advanced digital SoCs and signal-chain subsystems.

FAQ

What is the minimum output capacitor value required for stability?

The LD39080PT25-R requires a minimum 2.2 µF ceramic output capacitor with ESR below 100 mΩ for guaranteed stability across temperature and load. Figure 15–16 in the datasheet defines the full CO–ESR stability region; using X7R/X5R dielectrics with rated voltage ≥1.5× VO ensures margin under DC bias and temperature drift.

Can the inhibit 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, tie VINH directly to VI (input voltage) to maintain permanent enable state. Leaving it open risks undefined output behavior and potential oscillation due to noise coupling.

How does the LD39080PT25-R handle reverse current flow?

The device incorporates internal reverse-current blocking, preventing current from flowing from VO back to VI when input is removed or drops below output voltage. This eliminates need for external blocking diodes in battery backup or hot-swap configurations, reducing BOM count and forward voltage loss.

Is the ADJ pin compatible with resistive feedback networks using standard 1% tolerance resistors?

Yes-standard 1% metal-film or thick-film resistors are fully compatible. With a 1.22 V reference and typical output tolerance of ±1.5%, selecting R1/R2 to yield nominal VO provides sufficient margin for most applications; for tighter accuracy, use 0.1% resistors or add trim capability in the feedback path.

LD39080PT25-R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-5, DPAK (4 Leads + Tab), TO-252AD

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):: 2.5V

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:: PPAK

LD39080PT25-R FAQ

1.How can I place an order for LD39080PT25-R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39080PT25-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 LD39080PT25-R reliable?

The price and inventory of LD39080PT25-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39080PT25-R is usually 5 days.

3.What payment methods are accepted for LD39080PT25-R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39080PT25-R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39080PT25-R?

LD39080PT25-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39080PT25-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 LD39080PT25-R?

For technical support, including LD39080PT25-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39080PT25-R requirements.

6.How does Aetrix verify that LD39080PT25-R is sourced from the original manufacturer or authorized distributors?

All LD39080PT25-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 LD39080PT25-R meets industry standards.

7.What is the process for return or replacement of LD39080PT25-R?

All LD39080PT25-R units undergo pre-shipment inspection (PSI). If there is an issue with LD39080PT25-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 LD39080PT25-R part is unused and in its original packaging.

Return procedure for LD39080PT25-R:

1.Submit a request within 90 days.

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

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