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

STMicroelectronics LDF25PT-TR

Name: LDF25PT-TR
Brand: STMicroelectronics
SKU: LDF25PT-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LDF25PT-TR

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LDF25PT-TR.pdf

Description:: IC REG LINEAR 2.5V 1A PPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LDF25PT-TR from STMicroelectronics is a 1 A adjustable low-dropout linear regulator in DFN6 (3x3) package, supporting output voltages from 0.8 V to 12 V with ±1% reference tolerance, 500 mV max dropout at 1 A, and logic-controlled enable/Power Good functionality. It targets low-voltage microprocessor core supplies and memory biasing in space-constrained portable and industrial systems.

For engineers reviewing the LDF25PT-TR datasheet, LDF25PT-TR pinout, LDF25PT-TR application, or LDF25PT-TR equivalent, key selection criteria include its 0.8 V adjustable output capability, 200 µA typical quiescent current at full load, -40 °C to 125 °C operating junction temperature, and integrated thermal/current protection - all critical for battery-powered and thermally demanding embedded designs.

Technical Context

The LDF25PT-TR implements an internal N-channel pass transistor with error amplifier feedback referenced to a 0.8 V bandgap voltage, enabling precise output regulation across input voltages from 2.6 V to 16 V. Its ADJ pin accepts resistor-divider feedback for programmable output, while EN and open-drain PG pins support power sequencing and fault monitoring.

It features fast transient response due to optimized control-loop compensation compatible with 2.2 µF ceramic output capacitors, and includes internal foldback current limiting and thermal shutdown at 170 °C with 10 °C hysteresis. The device operates with no external compensation required and maintains stability over full temperature and load range.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	1 A guaranteed continuous output - supports high-current digital loads without external boost circuitry
Dropout voltage	≤500 mV at 1 A - enables operation with minimal headroom (e.g., 3.3 V out from 3.8 V input)
Reference voltage	0.8 V ±1% - sets minimum output and defines accuracy of resistor-divider programming
Quiescent current	200 µA typ. at 1 A load - minimizes standby power loss in always-on subsystems
Operating temperature	-40 °C to 125 °C junction - qualified for under-hood automotive and industrial ambient environments
Supply rejection	62 dB at 120 Hz - suppresses ripple from noisy DC-DC pre-regulators feeding the LDO
Noise voltage	50 µVRMS (10 Hz–100 kHz) - suitable for noise-sensitive analog rails and RF power domains

Pinout & Package

Package: DFN6 (3x3 mm, 0.9 mm height), exposed thermal pad connected to GND for enhanced heat dissipation (R_thJC = 10 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
VOUT (Pin 1)	Regulated output node	Delivers stable voltage to load; requires 2.2 µF ceramic capacitor placed adjacent for loop stability
ADJ (Pin 2)	Error amplifier inverting input	Accepts resistor divider feedback to set output voltage per V_OUT = 0.8 V × (1 + R1/R2)
PG (Pin 3)	Open-drain Power Good flag	Pulls low when output deviates >8% below nominal; requires external 10–100 kΩ pull-up
GND (Pin 4)	Analog and power ground	Common reference for all internal circuits; connects to exposed thermal pad
EN (Pin 5)	Active-high enable input	Drives regulator ON when ≥2 V; pulls to GND for <0.8 V to enter shutdown (I_Q ≤ 120 µA)
VIN (Pin 6)	Input supply connection	Accepts 2.6–16 V DC; requires ≥1 µF ceramic capacitor within 12.7 mm of pin

Key Features

Feature	Design Value
Adjustable output range	0.8 V to 12 V via external resistors - enables single BOM part to serve multiple voltage rails
Logic-controlled shutdown	EN pin reduces quiescent current to ≤120 µA over temperature - extends battery life in sleep modes
Power Good monitoring	PG pin provides real-time output validity signal - enables safe sequencing with FPGAs and processors
Thermal protection	170 °C shutdown with 10 °C hysteresis - prevents permanent damage during sustained overload or poor heatsinking
Stability with ceramic caps	Compatible with 2.2 µF X7R/X5R ceramics - eliminates need for costly tantalum or electrolytic capacitors

Applications

Mobile SoC Core Supply

Industrial PLC I/O Module

Use Scenario: Powers ARM Cortex-A series CPU cores requiring tightly regulated 0.85 V–1.2 V at up to 1 A with fast load transients.

IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise core voltage with dynamic response to burst-mode processor activity.

Use Value: 50 µVRMS noise and 500 mV dropout allow direct regulation from intermediate 3.3 V rail, reducing system component count and board area.

Use Scenario: Supplies isolated analog sensor front-ends and DAC reference buffers in DIN-rail mounted controllers.

IC Role / Device Role / Timing Role: Precision local regulator providing stable 3.3 V or 5 V from wide-input 12–24 V DC bus with thermal resilience.

Use Value: -40 °C to 125 °C operation and internal thermal shutdown ensure reliability in unventilated enclosures with ambient temperatures up to 85 °C.

Battery-Powered Medical Monitor

Set-Top Box HDMI PHY Bias

Use Scenario: Delivers 1.8 V to ECG signal chain ADCs and low-power Bluetooth LE radios in handheld diagnostic devices.

IC Role / Device Role / Timing Role: Low-quiescent-current LDO maintaining rail integrity during multi-day battery operation and wake-on-event cycles.

Use Value: 200 µA typical I_Q at full load and EN-controlled shutdown reduce average system current by >40% versus legacy regulators.

Use Scenario: Provides 1.2 V bias to HDMI transmitter PHY blocks requiring ultra-low noise and tight voltage tolerance.

IC Role / Device Role / Timing Role: Noise-suppressing post-regulator decoupling switching regulator ripple before high-speed serial interface.

Use Value: 62 dB SVR at 120 Hz and 50 µVRMS broadband noise prevent jitter-induced bit errors in 3 Gbps HDMI links.

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 XC6219B122MR-G	Fixed 1.2 V output only; 200 mA max current; 350 mV dropout at 200 mA	Not adjustable; insufficient current for 1 A loads; limited to low-power peripherals	Select only if fixed 1.2 V and sub-200 mA load are confirmed requirements
Diodes Inc. AP7361-C-12SAG-7	1.2 V fixed output; 600 mV dropout at 1 A; 50 µA quiescent current	Lacks ADJ, EN, and PG pins; no programmability or sequencing capability	Choose only when simplicity and ultra-low I_Q outweigh need for voltage flexibility and system monitoring

Compared with XC6219B122MR-G and AP7361-C-12SAG-7, the LDF25PT-TR uniquely combines 1 A adjustability, integrated PG/EN, and industrial temperature range - making it the sole fit for programmable, sequenced, and thermally robust LDO applications.

Availability

LDF25PT-TR is available at Aetrix Electronics and suitable for computer and laptop power management, battery-powered medical equipment, and industrial PLC I/O modules requiring stable component supply and long-term lifecycle assurance.

Supply support for LDF25PT-TR 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 industrial, automotive, and consumer markets.

The LDF series was developed specifically for high-precision, low-noise, and thermally resilient linear regulation in space-constrained embedded systems where efficiency, accuracy, and reliability are non-negotiable.

FAQ

What is the minimum input voltage required for stable 0.8 V output regulation?

The LDF25PT-TR requires VIN ≥ VOUT + VDROP. With 0.8 V output and max 500 mV dropout, minimum VIN is 1.3 V - but datasheet specifies absolute minimum VIN = 2.6 V for guaranteed operation across temperature and process variation. Below 2.6 V, regulation is not assured even if dropout appears sufficient.

Can the ADJ pin be left unconnected for fixed-output use?

No. The ADJ pin must be connected to the output via resistor divider for adjustable operation. For fixed outputs, ST offers dedicated fixed-voltage variants (e.g., LDF25PU-TR). Leaving ADJ floating causes undefined regulation behavior and potential instability due to uncontrolled feedback path.

How is the Power Good threshold calculated for a 1.8 V output design?

PG asserts high when VOUT is within ±8% of the target setpoint. For 1.8 V output, PG goes high when VOUT ≥ 1.656 V (0.92 × 1.8 V) and remains high until VOUT drops below 1.44 V (0.8 × 1.8 V). This window ensures reliable detection of brownout conditions before downstream logic fails.

Does the exposed thermal pad require solder mask opening or thermal vias?

Yes. The exposed pad (EXP PAD) must be soldered directly to a large copper pour tied to GND, with ≥4 thermal vias (0.3 mm diameter) connecting to inner/ground planes. Omitting this compromises R_thJA performance and risks thermal shutdown at >600 mA load in still-air conditions.

LDF25PT-TR 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):: 16V

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.5V @ 1A

Current - Output:: 1A

Current - Quiescent (Iq):: 800 µA

Current - Supply (Max):: -

PSRR:: 60dB ~ 45dB (120Hz ~ 100kHz)

Control Features:: Enable, Power Good

Protection Features:: Over Current, Over Temperature, Under Voltage Lockout (UVLO)

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PPAK

LDF25PT-TR FAQ

1.How can I place an order for LDF25PT-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for LDF25PT-TR 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 LDF25PT-TR reliable?

The price and inventory of LDF25PT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDF25PT-TR is usually 5 days.

3.What payment methods are accepted for LDF25PT-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDF25PT-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LDF25PT-TR?

LDF25PT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LDF25PT-TR 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 LDF25PT-TR?

For technical support, including LDF25PT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDF25PT-TR requirements.

6.How does Aetrix verify that LDF25PT-TR is sourced from the original manufacturer or authorized distributors?

All LDF25PT-TR 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 LDF25PT-TR meets industry standards.

7.What is the process for return or replacement of LDF25PT-TR?

All LDF25PT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LDF25PT-TR, 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 LDF25PT-TR part is unused and in its original packaging.

Return procedure for LDF25PT-TR:

1.Submit a request within 90 days.

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

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