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STMicroelectronics LF25ABPT-TR
- Part No.:
- LF25ABPT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LF25ABPT-TR.pdf
- Description:
- IC REG LINEAR 2.5V 500MA PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,355
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Product details
Overview
LF25ABPT-TR from STMicroelectronics is a 2.5 V fixed-output, very low dropout (LDO) linear voltage regulator in PENTAWATT-5 package with logic-controlled shutdown, delivering up to 500 mA output current, 0.35 V typical dropout at 500 mA, ±1% output voltage accuracy at 25°C, and 50 µA quiescent current in OFF mode. It serves as a local power supply for microcontroller cores, sensor interfaces, and RF subsystems in battery-powered industrial and automotive control units.
For engineers reviewing the LF25ABPT-TR datasheet, LF25ABPT-TR pinout, LF25ABPT-TR application, or LF25ABPT-TR equivalent, key selection considerations include its 0.35 V dropout at full load, TTL-compatible enable input (pin 2), ±1% initial output tolerance, -40 to 125°C operating junction temperature, and stability with only 2.2 µF ceramic output capacitance.
Technical Context
The LF25ABPT-TR implements a PNP pass transistor architecture enabling ultra-low dropout operation, with internal current and thermal limiting for robustness. Its shutdown function accepts TTL-level logic on pin 2, allowing precise system-level power sequencing and standby mode control without external circuitry.
It achieves 82 dB supply voltage rejection at 120 Hz and maintains 50 µV RMS output noise (10 Hz–100 kHz), making it suitable for noise-sensitive analog and mixed-signal circuits. The device operates across VI = 3.5 V to 16 V and supports full-load regulation down to VI = VO + Vd (min 3.8 V at 500 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±1% at 25°C - ensures stable core voltage for 2.5 V logic and precision analog stages |
| Dropout Voltage | 0.35 V typ. at 500 mA - enables operation from 3.8 V input, extending battery runtime in single-cell Li-ion or dual-cell alkaline systems |
| Quiescent Current | 50 µA in OFF mode, 500 µA in ON mode - minimizes standby power loss during deep-sleep MCU states |
| Output Current | 500 mA continuous - sufficient to power ARM Cortex-M peripherals, CAN transceivers, or multi-sensor nodes |
| Input Voltage Range | 3.5 V to 16 V - compatible with wide-input industrial supplies and unregulated DC rails |
| PSRR | 82 dB at 120 Hz - suppresses ripple from switching pre-regulators or noisy DC/DC converters |
| Operating Temp | -40°C to +125°C junction - qualified for under-hood automotive and industrial motor drive environments |
| Stability Cap | 2.2 µF ceramic (ESR 0.1–10 Ω) - reduces board area and BOM cost vs. larger tantalum or electrolytic alternatives |
Pinout & Package
PENTAWATT-5 (vertical mount, 5-pin) package with exposed tab for thermal dissipation; pin 1 = Input, pin 2 = Shutdown (TTL-compatible), pin 3 = Ground, pin 4 = Output, pin 5 = Bypass (not used in standard configuration per datasheet Figure 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input (VI) | Unregulated DC input; must be ≥ VO + Vd and ≤ 16 V; requires local 0.1 µF ceramic decoupling |
| 2 | Shutdown (SHDN) | TTL-compatible enable: <0.8 V = OFF (50 µA IQ), >2 V = ON (500 µA IQ); open-drain compatible with pull-up |
| 3 | Ground (GND) | Power and signal reference return; connected to exposed tab for thermal conduction |
| 4 | Output (VO) | Regulated 2.5 V output; requires 2.2 µF ceramic capacitor (X5R/X7R) with ESR 0.1–10 Ω |
| 5 | Bypass (BP) | No connection required in standard operation; unused per datasheet schematic and pin config diagrams |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout | 0.35 V at 500 mA enables use with marginal input margins - critical for battery voltage sag compensation |
| Logic-controlled shutdown | Pin 2 accepts TTL levels directly, eliminating need for level-shifting or external MOSFET switches |
| ±1% output accuracy | Guaranteed at 25°C (AB grade) - reduces calibration overhead in precision ADC reference or DAC biasing applications |
| Low-noise regulation | 50 µV RMS noise (10 Hz–100 kHz) preserves SNR in audio codecs, sensor front-ends, and RF LDO stages |
| Thermal & current protection | Internally limits power dissipation and output current - prevents latch-up during short-circuit or overload events |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated 2.5 V ADC reference and digital isolator side in modular I/O expansion cards. IC Role / Device Role / Timing Role: Local LDO providing clean, sequenced 2.5 V rail synchronized with controller enable signals. Use Value: Enables zero-crossing detection and high-resolution analog sensing despite 12–24 V field bus fluctuations and EMI. | Use Scenario: Supplying 2.5 V to LIN transceiver and door module microcontroller in sleep/wake cycles. IC Role / Device Role / Timing Role: Primary low-power regulator with fast-enable shutdown for meeting ISO 11898-3 quiescent current targets. Use Value: Reduces total module standby current to <100 µA via pin-controlled OFF mode, extending vehicle battery life. |
| Portable Medical Sensor Hub | Smart Energy Meter MCU Core |
Use Scenario: Regulating power to optical heart-rate sensor ASIC and BLE SoC in wearable patch design. IC Role / Device Role / Timing Role: Single-chip solution delivering 2.5 V at 300 mA with sub-100 µA shutdown IQ. Use Value: Supports >7-day battery life on CR2032 using minimal 2.2 µF output cap and no external bias components. | Use Scenario: Supplying 2.5 V to metrology ADC and real-time clock in Class 0.5 electricity meters. IC Role / Device Role / Timing Role: Precision LDO ensuring stable reference voltage under wide temperature (-25°C to 70°C ambient) and line-voltage variation. Use Value: Maintains ±0.5% energy measurement accuracy over lifetime by minimizing VO drift and PSRR-induced error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LDL112M25R | 2.5 V, 200 mA, 0.35 V dropout, SOT-23-5, 30 µA IQ (ON) | Lower current rating; smaller footprint; no thermal pad | Select for space-constrained, lower-current designs where PENTAWATT thermal performance is unnecessary |
| LD3985M25R | 2.5 V, 500 mA, 0.25 V dropout, SOT-23-5, 50 µA IQ (OFF) | Lower dropout but limited to 125°C max junction; no shutdown pin - uses EN instead | Choose when minimum dropout is critical and shutdown timing must be controlled via active-high EN rather than TTL-level SHDN |
Compared with LDL112M25R and LD3985M25R, the LF25ABPT-TR uniquely combines 500 mA capability, TTL-compatible shutdown pin, PENTAWATT thermal performance (RthJC = 3°C/W), and ±1% accuracy - making it optimal for industrial and automotive modules requiring robust, sequenced, high-current local regulation.
Availability
LF25ABPT-TR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, portable medical sensor hubs, and smart energy meter MCU cores requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LF25ABPT-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 automotive-grade components.
The LF00 series is ST's high-precision, low-dropout linear regulator product line targeting battery-powered and thermally demanding applications where efficiency, noise, and accuracy are critical - especially in automotive, industrial, and medical equipment.
FAQ
What is the minimum input voltage required for 500 mA output at 2.5 V?
The minimum input voltage is VO + Vd = 2.5 V + 0.4 V = 2.9 V (max dropout at 500 mA). However, datasheet Table 7 specifies VI ≥ 3.8 V for full-load regulation, due to internal headroom requirements for control loop stability and thermal margin - thus 3.8 V is the practical minimum.
Can pin 5 (Bypass) be left floating or must it be tied to ground?
Pin 5 is unused in standard operation per ST's LF00 series schematic and pin configuration diagrams. It may be left floating or connected to ground - neither affects regulation, stability, or thermal performance. No bypass capacitor or external component is required on this pin.
Does the LF25ABPT-TR meet AEC-Q100 for automotive use?
The LF25ABPT-TR is not individually AEC-Q100 qualified; however, it belongs to the LF00 series, which is manufactured on ST's qualified automotive processes and specified for -40°C to +125°C junction operation. System-level qualification per AEC-Q100 is required for automotive deployment.
Is an input capacitor mandatory, and what value is recommended?
Yes, a 0.1 µF ceramic capacitor (X5R/X7R) is mandatory at the input (pin 1) per datasheet test conditions and stability guidelines. It suppresses high-frequency noise and prevents oscillation caused by PCB trace inductance - omitting it risks instability under dynamic load conditions.
LF25ABPT-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):
- 0.7V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 82dB ~ 65dB (120Hz ~ 10kHz)
- 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
LF25ABPT-TR FAQ
1.How can I place an order for LF25ABPT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF25ABPT-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 LF25ABPT-TR reliable?
The price and inventory of LF25ABPT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF25ABPT-TR is usually 5 days.
3.What payment methods are accepted for LF25ABPT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF25ABPT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF25ABPT-TR?
LF25ABPT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF25ABPT-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 LF25ABPT-TR?
For technical support, including LF25ABPT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF25ABPT-TR requirements.
6.How does Aetrix verify that LF25ABPT-TR is sourced from the original manufacturer or authorized distributors?
All LF25ABPT-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 LF25ABPT-TR meets industry standards.
7.What is the process for return or replacement of LF25ABPT-TR?
All LF25ABPT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF25ABPT-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 LF25ABPT-TR part is unused and in its original packaging.
Return procedure for LF25ABPT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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