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

STMicroelectronics LD39300PT25-R

Name: LD39300PT25-R
Brand: STMicroelectronics
SKU: LD39300PT25-R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39300PT25-R

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LD39300PT25-R.pdf

Description:: IC REG LINEAR 2.5V 3A PPAK

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Inventory:2,143

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Product details

Overview

LD39300PT25-R from STMicroelectronics is a 2.5V fixed-output, 3A ultra-low-dropout linear voltage regulator in PPAK package, featuring 200mV typical dropout at full load, 1.2mA quiescent current during operation, and logic-controlled shutdown. It operates from 2.5V to 6V input and delivers stable power to low-voltage microprocessors and memory subsystems in automotive and industrial control units.

For engineers reviewing the LD39300PT25-R datasheet, LD39300PT25-R pinout, LD39300PT25-R application, or LD39300PT25-R equivalent, key selection criteria include guaranteed 3A output, ±1.5% output voltage tolerance at 25°C, fast transient response, ceramic-capacitor compatibility, and thermal/current protection with inhibit control.

Technical Context

The LD39300PT25-R uses a BiCMOS process enabling load-independent quiescent current-1.2mA typ. at 3A load and ≤1µA in shutdown-critical for battery-backed systems. Its error amplifier drives an internal N-channel pass transistor, supporting fast line/load transient response (e.g., 20µs turn-on/off under 3A step load).

Stability is ensured with ≥4.7µF ceramic output capacitance and ESR within defined bounds (per Figure 14/15), while the inhibit pin (VINH) provides clean ON/OFF control with 2V high-threshold and 0.3V low-threshold, requiring external pull-up when unused.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5V ±1.5% at 25°C; ensures precise core rail compliance for 2.5V FPGA I/O or DSP interfaces.
Max Output Current	3A guaranteed; supports high-current digital loads without external current boosting.
Dropout Voltage	200mV typ. @ 3A; enables regulation from 2.75V input, extending battery runtime in 3.0V nominal systems.
Quiescent Current	1.2mA typ. @ 3A load; minimizes no-load power loss in always-on subsystems.
Shutdown Current	≤1µA @ 25°C; reduces standby consumption to negligible levels in sleep-mode applications.
Input Voltage Range	2.5V to 6V; compatible with single-cell Li-ion (3.0–4.2V), 3.3V rails, and post-regulated DC-DC outputs.
Thermal Shutdown	170°C activation with 10°C hysteresis; prevents permanent damage during sustained overload or poor heatsinking.

Pinout & Package

LD39300PT25-R is housed in a thermally enhanced PPAK (Power Package) with exposed die pad for improved heat dissipation. The package measures 6.0 × 6.6 × 2.4 mm and features a 5-pin configuration optimized for high-current linear regulation.

Pin/Terminal	Circuit Role	Design Meaning
1 VINH	Inhibit Control Input	Logic-level enable/disable: ≥2V = ON, ≤0.3V = OFF; must not float; requires external pull-up if unused.
2 GND	Power Ground Reference	Common return path for input/output currents and internal bias; connects directly to thermal pad for optimal junction cooling.
3 VO	Regulated Output	2.5V output node; requires ≥4.7µF ceramic capacitor placed ≤1cm away with dedicated ground trace.
4 VI	Input Supply	2.5–6V input; requires ≥1µF ceramic capacitor located ≤1cm from pin with low-inductance ground path.
5 VSENSE/N.C.	Feedback Sense / No Connect	Not connected on fixed-output versions (e.g., LD39300PT25-R); reserved for ADJ variants only.

Key Features

Feature	Design Value
Ultra-Low Dropout	200mV @ 3A enables operation with minimal headroom-critical for Li-ion-powered portable instrumentation.
BiCMOS Quiescent Optimization	1.2mA IQ independent of load current preserves efficiency across dynamic duty cycles in sensor nodes.
Ceramic Capacitor Stability	Stable with ≥4.7µF X7R/X5R ceramics (no ESR requirement), reducing BOM cost and board area vs. tantalum.
Fast Transient Response	20µs current-limit activation and sub-10µs load-step recovery maintain voltage integrity during CPU burst modes.
Integrated Protection	Thermal shutdown (170°C), current limiting (6A short-circuit), and reverse-battery safe input handling.

Applications

Microprocessor Core Supply

DSP Power Rail

Use Scenario: Providing clean 2.5V core voltage to ARM Cortex-M7 MCU operating at 300MHz with dynamic current draw from 10mA to 2.8A.

IC Role / Device Role / Timing Role: Primary linear regulator delivering low-noise, ripple-free supply with <100µVRMS output noise (10Hz–100kHz).

Use Value: Eliminates need for additional LDO post-filtering stages while maintaining <±1.5% output accuracy over -40°C to 125°C.

Use Scenario: Powering TI C6748 DSP I/O banks requiring tightly regulated 2.5V with fast load transient recovery.

IC Role / Device Role / Timing Role: Low-dropout post-regulator following a 3.3V buck converter, absorbing switching noise and ripple.

Use Value: Achieves 55dB PSRR at 1kHz and 20µs turn-on time, preventing data corruption during rapid clock-domain transitions.

Automotive Body Control Module

Industrial PLC I/O Isolation

Use Scenario: Supplying 2.5V to CAN transceiver logic and EEPROM in AEC-Q100-compliant body controller.

IC Role / Device Role / Timing Role: Fault-tolerant local regulator with inhibit control synchronized to vehicle ignition state.

Use Value: Delivers ≤1µA shutdown current and survives 6.5V load-dump transients via internal VI clamp.

Use Scenario: Powering isolated ADC front-end and optocoupler drivers in 24V-powered programmable logic controllers.

IC Role / Device Role / Timing Role: High-reliability linear regulator with thermal foldback and current limit for harsh industrial environments.

Use Value: Maintains regulation up to 125°C ambient and recovers automatically after thermal events without system reset.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSM1083-2.5	2.5V fixed, 3A, 300mV dropout @ 3A, 2.5mA IQ, DFN-8 package	Lacks inhibit pin; lower thermal performance (R_thJA = 120°C/W vs. 100°C/W)	Choose when board space is constrained and shutdown control is unnecessary.
TPS7A4701RGWR	2.5V adj/fixed, 1A, 170mV dropout @ 1A, 1mA IQ, WQFN-20	Lower current rating; superior PSRR (70dB @ 1kHz) but limited to 1A max	Prefer for noise-sensitive analog signal chains where 1A suffices and footprint allows.

Compared with TSM1083-2.5 and TPS7A4701RGWR, LD39300PT25-R uniquely combines 3A capability, 200mV dropout, inhibit control, and PPAK thermal performance-making it optimal for high-current embedded systems requiring both efficiency and robustness.

Availability

LD39300PT25-R is available at Aetrix Electronics and suitable for microprocessor core supplies, DSP power rails, automotive body control modules, and industrial PLC I/O isolation requiring stable component supply across extended temperature ranges.

Supply support for LD39300PT25-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 LD39300 belongs to ST's high-performance LDO portfolio, engineered specifically for low-voltage, high-current applications demanding ultra-low dropout, fast transient response, and integrated protection in automotive and industrial environments.

FAQ

What is the minimum output capacitance required for stability?

The LD39300PT25-R requires a minimum 4.7µF ceramic output capacitor placed within 1cm of the VO and GND pins. Stability is maintained across temperature and load when the capacitor's ESR falls within the region defined in Figures 14 and 15 of the datasheet-no minimum ESR is mandated, unlike older LDOs.

Can the inhibit pin be left unconnected?

No-the inhibit pin (VINH) has no internal pull-up or pull-down. Leaving it floating risks unpredictable ON/OFF behavior. If shutdown control is unused, VINH must be tied directly to VI (input voltage) to ensure continuous operation.

Is the LD39300PT25-R qualified for automotive applications?

Yes-the device is specified for -40°C to 125°C operating junction temperature and meets AEC-Q100 stress test requirements per ST's qualification report. It is widely deployed in automotive body control modules and infotainment power domains.

How does thermal resistance compare between PPAK and DPAK packages?

Both PPAK and DPAK variants share identical R_thJA = 100°C/W and R_thJC = 8°C/W values. The PPAK offers superior board-level thermal performance due to its smaller footprint and optimized thermal pad layout, especially in multi-layer PCBs with internal copper planes.

LD39300PT25-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):: 0.4V @ 3A

Current - Output:: 3A

Current - Quiescent (Iq):: 5 µA

Current - Supply (Max):: 2.5 mA

PSRR:: 65dB ~ 55dB (120Hz ~ 1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PPAK

LD39300PT25-R FAQ

1.How can I place an order for LD39300PT25-R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39300PT25-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 LD39300PT25-R reliable?

The price and inventory of LD39300PT25-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39300PT25-R is usually 5 days.

3.What payment methods are accepted for LD39300PT25-R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39300PT25-R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39300PT25-R?

LD39300PT25-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39300PT25-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 LD39300PT25-R?

For technical support, including LD39300PT25-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39300PT25-R requirements.

6.How does Aetrix verify that LD39300PT25-R is sourced from the original manufacturer or authorized distributors?

All LD39300PT25-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 LD39300PT25-R meets industry standards.

7.What is the process for return or replacement of LD39300PT25-R?

All LD39300PT25-R units undergo pre-shipment inspection (PSI). If there is an issue with LD39300PT25-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 LD39300PT25-R part is unused and in its original packaging.

Return procedure for LD39300PT25-R:

1.Submit a request within 90 days.

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

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