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STMicroelectronics LF25ABDT-TRY
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- Part No.:
- LF25ABDT-TRY
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LF25ABDT-TRY.pdf
- Description:
- IC REG LINEAR 2.5V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,925
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Product details
Overview
LF25ABDT-TRY from STMicroelectronics is a very low-dropout linear voltage regulator with logic-controlled shutdown, delivering 2.5 V ±1% output at up to 500 mA. It features 0.4 V typical dropout at 500 mA, 50 µA quiescent current in OFF mode, and operates across –40 °C to 125 °C for automotive applications. Its DPAK package and TTL-compatible inhibit pin enable precise power gating in engine control units.
For engineers reviewing the LF25ABDT-TRY datasheet, LF25ABDT-TRY pinout, LF25ABDT-TRY application, or LF25ABDT-TRY equivalent, this device is selected for battery-powered ADAS modules, infotainment domain controllers, and low-noise sensor supply rails where thermal robustness and shutdown control are critical.
Technical Context
The LF25ABDT-TRY integrates an internal PNP pass transistor with thermal and current limiting, enabling stable regulation under transient load steps without external compensation beyond a 2.2 µF ceramic output capacitor. Its inhibit function accepts TTL-level logic (VIL ≤ 0.8 V, VIH ≥ 2 V) on Pin 2, directly controlling regulator enable state.
Designed for automotive-grade reliability, it meets AEC-Q100 Grade 1 qualification (–40 °C to 125 °C), includes PAT/SYL/SBL statistical testing, and maintains 82 dB supply rejection at 120 Hz - critical for suppressing alternator ripple in 12 V vehicle systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±1% at 25 °C; ensures precision biasing for 2.5 V ADC references and microcontroller I/O domains |
| Dropout Voltage | 0.4 V max at 500 mA; enables operation from 2.9 V input in cold-crank scenarios (e.g., 6.5 V nominal battery down to 2.8 V) |
| Quiescent Current | 50 µA in OFF mode; reduces standby leakage in always-on ECU modules during ignition-off periods |
| Output Current | 500 mA continuous; supports dual-core MCU + CAN transceiver + SPI flash in compact ECUs |
| Supply Rejection | 82 dB at 120 Hz; suppresses engine noise coupling from 12 V rail into sensitive analog subsystems |
| Operating Temp | –40 °C to 125 °C junction; qualified for under-hood placement per AEC-Q100 Grade 1 |
| Stability Cap | 2.2 µF ceramic (ESR 0.1–10 Ω); eliminates need for bulky tantalum capacitors, saving PCB area and cost |
Pinout & Package
DPAK (TO-252-3) package with exposed thermal pad electrically connected to GND; 3-pin configuration (Input, GND, Output) plus dedicated Inhibit pin (Pin 2) in 5-pin variant - LF25ABDT-TRY uses the 5-pin DPAK variant per order code suffix "DT".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Regulator input | Accepts 3.5–16 V DC; internal overvoltage clamp activates above 40 V |
| Pin 2 (INH) | Inhibit control input | TTL-compatible; pulls regulator into <100 µA shutdown when ≤0.8 V |
| Pin 3 (GND) | Ground reference | Common return for IN, OUT, and INH; thermally tied to exposed pad |
| Pin 4 (OUT) | Regulated output | Delivers 2.5 V ±1% with ≤15 mV load/line regulation across full operating range |
| Pin 5 (TAB) | Thermal pad / GND | Electrically connected to GND; must be soldered to PCB copper for RthJA = 100 °C/W |
Key Features
| Feature | Design Value |
|---|---|
| Logic-controlled shutdown | Direct TTL-compatible inhibit pin enables system-level power sequencing without external MOSFET drivers |
| Automotive qualification | AEC-Q100 Grade 1 certified with PAT/SYL/SBL testing - validated for engine bay deployment |
| Low-noise regulation | 50 µV RMS output noise (10 Hz–100 kHz) preserves SNR in analog front-ends and camera ISPs |
| Internal protection | Integrated current limit and thermal shutdown prevent latch-up during short-circuit or overload events |
| Minimal external components | Stable with only 2.2 µF ceramic output cap - eliminates ESR-sensitive electrolytics and saves board space |
Applications
| Engine Control Unit (ECU) | ADAS Camera Module |
|---|---|
Use Scenario: Powering 32-bit MCU, CAN FD transceiver, and analog sensors in diesel common-rail injection controller. IC Role / Device Role / Timing Role: Primary 2.5 V local regulator with shutdown synchronized to ignition key-off signal. Use Value: 50 µA OFF-mode current extends battery life during 30-day parking; 0.4 V dropout sustains operation during 6.2 V cold-crank dips. | Use Scenario: Supplying image signal processor and CIS sensor in forward-facing monocular camera. IC Role / Device Role / Timing Role: Low-noise 2.5 V bias rail decoupled from noisy 12 V domain via LDO filtering. Use Value: 50 µV output noise prevents fixed-pattern noise in 12-bit RAW image data; 82 dB SVR rejects alternator ripple. |
| Infotainment Domain Controller | Body Control Module (BCM) |
Use Scenario: Regulating power for audio codec, touch controller, and display interface in head-unit mainboard. IC Role / Device Role / Timing Role: Secondary 2.5 V supply enabled only during active UI session via microcontroller GPIO. Use Value: Inhibit pin allows dynamic power gating - cuts 500 mA standby draw to 50 µA when display is off. | Use Scenario: Powering LIN transceiver, EEPROM, and door-lock actuator drivers in central body gateway. IC Role / Device Role / Timing Role: Always-on 2.5 V rail with watchdog-triggered reset during brown-out conditions. Use Value: –40 °C to 125 °C operation supports glove-box mounting; internal thermal shutdown prevents failure during summer cabin heat soak. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73325PDBVR | Lower 250 mA output, 0.25 V dropout at 200 mA, no AEC-Q100 qualification | Consumer portables only; lacks automotive temp range and fault testing | Select only for non-automotive designs where 250 mA suffices and cost is primary driver |
| TPS7B8725QKVURQ1 | Higher 500 mA output, 0.35 V dropout at 500 mA, integrated reverse-polarity protection | Supports direct battery connection without external diode; wider VIN (1.6–40 V) | Prefer when reverse-battery immunity is required or input may dip below 3.5 V |
Compared with TLV73325PDBVR, LF25ABDT-TRY delivers higher current and automotive qualification but requires external reverse-protection; versus TPS7B8725QKVURQ1, it lacks reverse-polarity protection but offers lower BOM count in systems with upstream diode protection.
Availability
LF25ABDT-TRY is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, and infotainment domain controllers requiring stable component supply across automotive production lifecycles.
Supply support for LF25ABDT-TRY 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, designing and manufacturing microcontrollers, power management ICs, and automotive-grade analog devices.
The LFXX series targets automotive power management, specifically engineered to replace legacy 78xx regulators in ECU, body, and ADAS subsystems with enhanced efficiency, thermal resilience, and functional safety readiness.
FAQ
What is the minimum input voltage required for regulation at full 500 mA load?
The LF25ABDT-TRY requires a minimum input voltage of 2.9 V to maintain 2.5 V output at 500 mA, based on its maximum 0.4 V dropout specification. Below this, output voltage collapses linearly; operation is guaranteed only for VI ≥ VO + Vd(max) = 2.5 V + 0.4 V = 2.9 V under worst-case conditions.
Does the inhibit pin require a pull-up resistor?
No external pull-up is required. The INH pin has an internal weak pull-down (typ. 100 kΩ) ensuring default OFF state at power-up. A logic-high signal (≥2 V) actively enables regulation; floating the pin leaves the device disabled, preventing unintended startup during system reset sequences.
Can LF25ABDT-TRY be used without the output capacitor?
No. A minimum 2.2 µF ceramic capacitor with ESR between 0.1 Ω and 10 Ω is mandatory for stability per the datasheet. Omitting it causes oscillation and potential damage. The capacitor must be placed within 5 mm of the OUT and GND pins, with low-inductance layout to ensure phase margin >45°.
Is thermal pad soldering required for automotive operation?
Yes. The exposed thermal pad (Pin 5) is electrically GND and thermally critical. For reliable operation at 125 °C ambient, it must be soldered to ≥4 cm² of inner-layer GND copper with ≥4 thermal vias (0.3 mm diameter). Without this, junction temperature exceeds limits under 500 mA load, triggering thermal shutdown.
LF25ABDT-TRY 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):
- 1.3V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 2 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LF25ABDT-TRY FAQ
1.How can I place an order for LF25ABDT-TRY through Aetrix?
Please submit a Request for Quotation (RFQ) for LF25ABDT-TRY 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-TRY reliable?
The price and inventory of LF25ABDT-TRY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF25ABDT-TRY is usually 5 days.
3.What payment methods are accepted for LF25ABDT-TRY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF25ABDT-TRY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF25ABDT-TRY?
LF25ABDT-TRY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF25ABDT-TRY 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-TRY?
For technical support, including LF25ABDT-TRY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF25ABDT-TRY requirements.
6.How does Aetrix verify that LF25ABDT-TRY is sourced from the original manufacturer or authorized distributors?
All LF25ABDT-TRY 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-TRY meets industry standards.
7.What is the process for return or replacement of LF25ABDT-TRY?
All LF25ABDT-TRY units undergo pre-shipment inspection (PSI). If there is an issue with LF25ABDT-TRY, 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-TRY part is unused and in its original packaging.
Return procedure for LF25ABDT-TRY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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