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STMicroelectronics LF25ABDT-TR
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- Part No.:
- LF25ABDT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LF25ABDT-TR.pdf
- Description:
- IC REG LINEAR 2.5V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,581
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Product details
Overview
LF25ABDT-TR from STMicroelectronics is a 2.5 V, ±1% tolerance automotive-grade low-dropout linear regulator in PPAK-5 package with 500 mA output current capability, 0.4 V typical dropout at 500 mA, and logic-controlled shutdown (TTL-compatible enable pin). It operates from -40 °C to 125 °C and is qualified per AEC-Q100 for engine control units, body electronics, and ADAS power domains.
For engineers reviewing the LF25ABDT-TR datasheet, LF25ABDT-TR pinout, LF25ABDT-TR application, or LF25ABDT-TR equivalent, this device is selected for battery-powered automotive subsystems requiring stable 2.5 V rail, ultra-low quiescent current (50 µA in OFF mode), high PSRR (82 dB @ 120 Hz), and minimal external capacitance (2.2 µF).
Technical Context
The LF25ABDT-TR implements a PMOS pass transistor architecture enabling very low dropout voltage (0.4 V typ. @ 500 mA) and inherent reverse-polarity protection. Its internal bandgap reference and error amplifier deliver tight output regulation (±1% at 25 °C, ±2.5% over full temperature range) with line regulation of 2–15 mV and load regulation of 2–15 mV.
It features a dedicated TTL-compatible enable input (pin 2) that controls an electronic shutdown function, reducing quiescent current to 50 µA while maintaining fast wake-up response. Thermal and current limiting are fully integrated, and stability is ensured with only a 2.2 µF ceramic output capacitor (ESR 0.1–10 Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±1% at 25 °C; ensures precise biasing for 2.5 V logic, ADC references, and sensor interfaces |
| Dropout Voltage | 0.4 V max @ 500 mA; enables operation with VIN as low as 2.9 V, critical for cold-crank automotive conditions |
| Quiescent Current | 50 µA in OFF mode; reduces standby power in always-on modules like CAN transceivers or watchdog circuits |
| PSRR | 82 dB @ 120 Hz; suppresses ripple from noisy DC-DC stages feeding sensitive analog circuitry |
| Output Current | 500 mA continuous; supports moderate-power microcontrollers, interface ICs, and small displays |
| Stability Capacitor | 2.2 µF ceramic (ESR 0.1–10 Ω); eliminates need for large tantalum or electrolytic capacitors, saving board space |
| Operating Temp | -40 °C to +125 °C junction; validated for under-hood and transmission-control applications per AEC-Q100 Grade 0 |
Pinout & Package
LF25ABDT-TR uses the PPAK-5 (Power Package) surface-mount package with exposed thermal pad (electrically connected to GND), optimized for high-power density and thermal performance in automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – IN | Input voltage supply | Accepts 3.5–16 V DC; must be decoupled with ≥0.1 µF ceramic near pin |
| 2 – EN | Enable control input | TTL-compatible logic input; <0.8 V disables regulator (50 µA IQ), >2 V enables (500 µA IQ) |
| 3 – GND | Ground reference | Common return path for input, output, and enable; tied to exposed thermal pad |
| 4 – OUT | Regulated output | Delivers 2.5 V ±1% to load; requires 2.2 µF ceramic capacitor with ESR 0.1–10 Ω |
| 5 – TAB | Thermal pad / GND | Exposed copper pad soldered to PCB ground plane; essential for thermal dissipation (RthJA = 100 °C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 0 certified with PAT/SYL/SBL statistical testing; suitable for safety-critical ECUs |
| Low-noise regulation | 50 µV RMS output noise (10 Hz–100 kHz); preserves signal integrity in precision analog front-ends |
| Fast enable response | Typical turn-on delay <100 µs; supports dynamic power sequencing in multi-rail systems |
| Integrated protection | Thermal shutdown and current limiting prevent damage during overload or ambient overheating |
| Wide input range | Operates from 3.5 V to 16 V; accommodates 12 V battery variations including load dump (with external clamp) |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powering 2.5 V microcontroller core and CAN FD transceiver in gasoline/diesel ECU. IC Role / Device Role / Timing Role: Primary local LDO supplying clean, regulated 2.5 V rail with fast enable/disable for sleep/wake cycles. Use Value: Enables <50 µA system standby current and maintains 2.5 V accuracy across -40 °C to 125 °C engine bay temperatures. |
Use Scenario: Supplying 2.5 V to door module sensors (window position, lock actuator feedback) and LIN transceivers. IC Role / Device Role / Timing Role: Low-quiescent LDO with shutdown control for zone-based power gating. Use Value: Reduces parasitic drain on vehicle battery during extended parking; meets OEM <100 µA module sleep spec. |
| Advanced Driver Assistance Systems (ADAS) | Infotainment Power Management |
|
Use Scenario: Providing 2.5 V bias to radar MMIC power amplifiers and RF front-end ICs in 77 GHz radar modules. IC Role / Device Role / Timing Role: Noise-sensitive LDO delivering ultra-low-noise 2.5 V rail adjacent to RF circuitry. Use Value: 50 µV output noise and 82 dB PSRR minimize phase noise degradation in RF signal chains. |
Use Scenario: Regulating 2.5 V for display timing controller (TCON) and touch controller in center-stack infotainment head unit. IC Role / Device Role / Timing Role: Stable, low-dropout LDO supporting burst-mode operation during screen refresh. Use Value: 0.4 V dropout allows reliable 2.5 V output even during 12 V battery sag to 9 V during cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout automotive regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST25T3G | Fixed 2.5 V, ±2% tolerance, TO-220/TO-220FP package, no enable pin, 1.2 V dropout @ 800 mA | Lacks shutdown control and automotive qualification; limited to non-safety-critical cabin modules | Select when cost sensitivity outweighs need for AEC-Q100 compliance and ultra-low IQ |
| TPS78025QDRVRQ1 | 2.5 V, ±1%, 200 mA output, 0.45 V dropout, 250 nA IQ in shutdown, WSON-6 package | Lower current rating and smaller thermal footprint; suited for ultra-low-power MCU peripherals | Choose for sub-200 mA loads where nanoscale IQ and space-constrained layouts dominate design priorities |
Compared with NCP1117ST25T3G, LF25ABDT-TR adds AEC-Q100 qualification, enable control, and tighter tolerance; versus TPS78025QDRVRQ1, it delivers 2.5× higher current and superior thermal robustness in PPAK, making it optimal for mid-power automotive domains.
Availability
LF25ABDT-TR is available at Aetrix Electronics and suitable for engine control units, body electronics modules, ADAS radar subsystems, and infotainment power rails requiring stable component supply across automotive production lifecycles.
Supply support for LF25ABDT-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 analog, power, microcontroller, and sensor solutions for automotive, industrial, and consumer markets.
LF25ABDT-TR belongs to the LFXX family of automotive-qualified LDOs engineered specifically for demanding under-hood and chassis-mounted electronics requiring wide temperature operation, high reliability, and low-noise regulation.
FAQ
What is the minimum input voltage required for regulation at 500 mA output?
The LF25ABDT-TR maintains regulation down to VIN = VOUT + VDROP = 2.5 V + 0.4 V = 2.9 V at 500 mA (typical). The datasheet specifies 3.5 V as the minimum recommended operating input voltage to ensure margin across temperature, process variation, and load transients - consistent with automotive cold-crank requirements where battery may dip to ~6 V but local rails must remain stable.
Can the EN pin be left floating, or does it require a pull-up/down resistor?
The EN pin must not be left floating: it has no internal pull-up or pull-down. To guarantee defined startup behavior, connect EN to IN via a 100 kΩ resistor for default-enable operation, or to GND for permanent disable. For controlled sequencing, drive EN actively with a microcontroller GPIO or dedicated power manager - TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) ensure robust noise immunity.
Is the exposed thermal pad (Pin 5) electrically isolated or connected to GND?
The exposed thermal pad (TAB) is electrically connected to GND internally and must be soldered to a PCB copper pour tied to the system ground plane. This connection provides both thermal conduction (reducing RthJA from 100 °C/W to ~50 °C/W with 200 mm² 2-oz copper) and electrical grounding for noise suppression - failure to connect it compromises thermal performance and may cause instability or premature thermal shutdown.
How does the LF25ABDT-TR handle reverse polarity or load dump events?
The LF25ABDT-TR includes reverse-voltage protection via its PMOS pass element, blocking current flow if VIN < VOUT (e.g., battery reversal). However, it is not rated for direct load dump exposure (ISO 7637-2 Pulse 5a, up to 60 V). System-level protection - such as a TVS diode (e.g., SMAJ15A) and series input resistor - must be added upstream to clamp transients before they reach the IN pin, as specified in ST's application note AN4745.
LF25ABDT-TR 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):
- 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:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LF25ABDT-TR FAQ
1.How can I place an order for LF25ABDT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF25ABDT-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 LF25ABDT-TR reliable?
The price and inventory of LF25ABDT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF25ABDT-TR is usually 5 days.
3.What payment methods are accepted for LF25ABDT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF25ABDT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF25ABDT-TR?
LF25ABDT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF25ABDT-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 LF25ABDT-TR?
For technical support, including LF25ABDT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF25ABDT-TR requirements.
6.How does Aetrix verify that LF25ABDT-TR is sourced from the original manufacturer or authorized distributors?
All LF25ABDT-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 LF25ABDT-TR meets industry standards.
7.What is the process for return or replacement of LF25ABDT-TR?
All LF25ABDT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF25ABDT-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 LF25ABDT-TR part is unused and in its original packaging.
Return procedure for LF25ABDT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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