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

STMicroelectronics LF15ABDT-TR

Name: LF15ABDT-TR
Brand: STMicroelectronics
SKU: LF15ABDT-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LF15ABDT-TR

Manufacturer:: STMicroelectronics

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

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: LF15ABDT-TR.pdf

Description:: IC REG LINEAR 1.5V 500MA DPAK

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Product details

Overview

LF15ABDT-TR from STMicroelectronics is a 1.5 V, ±1% tolerance, automotive-grade low-dropout linear regulator in PPAK-5 package with logic-controlled shutdown (TTL-compatible enable), 0.45 V dropout at 200 mA, 500 mA output current capability, and operation from −40 °C to 125 °C. It serves as a local power rail for microcontroller core supplies in engine control units.

For engineers reviewing the LF15ABDT-TR datasheet, LF15ABDT-TR pinout, LF15ABDT-TR application, or LF15ABDT-TR equivalent, key selection criteria include dropout voltage under load, quiescent current in ON/OFF modes, AEC-Q100 qualification status, output voltage accuracy over temperature, and minimum required output capacitance for stability.

Technical Context

The LF15ABDT-TR implements a PNP pass transistor architecture enabling ultra-low dropout (0.45 V at 200 mA) and stable regulation with only 2.2 µF ceramic output capacitance (ESR 0.1–10 Ω). Its internal current and thermal limiting protect against fault conditions without external circuitry.

It features a dedicated TTL-compatible enable input (Pin 2) that places the device in <50 µA OFF-mode quiescent current when pulled low, supporting system-level power gating in automotive modules. The GND-connected tab ensures low thermal resistance (R_thJC = 8 °C/W) in the PPAK-5 package.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.5 V ±1% at 25 °C; maintains regulation across −40 °C to 125 °C junction temperature
Dropout Voltage	0.45 V typical at 200 mA load; enables operation with VI as low as 1.95 V for full 1.5 V output
Quiescent Current	500 µA typical in ON mode; 50 µA typical in OFF mode - critical for battery-backed standby functions
Output Current	500 mA continuous; internally current-limited to 1 A - supports MCU core + peripheral rail consolidation
Supply Rejection	82 dB typical at 120 Hz - suppresses ripple from upstream switching converters in mixed-signal domains
Stability Capacitor	2.2 µF ceramic (ESR 0.1–10 Ω); eliminates need for larger tantalum or electrolytic capacitors
Operating Temp	−40 °C to 125 °C junction; qualified per AEC-Q100 Grade 1 - suitable for under-hood ECU deployment

Pinout & Package

LF15ABDT-TR uses the PPAK-5 surface-mount package (7.8 mm × 5.2 mm × 1.8 mm), with exposed thermal pad electrically connected to GND for enhanced heat dissipation (R_thJA = 100 °C/W, R_thJC = 8 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 2.5–16 V DC; enters shutdown if VI > 18 V per datasheet absolute max rating
2 (EN)	Enable control input	TTL-compatible: <0.8 V = OFF (50 µA IQ), >2 V = ON (500 µA IQ); no pull-up required
3 (GND)	Ground reference	Common return for input, output, and enable; tab is internally bonded to this pin
4 (OUT)	Regulated output	Delivers stable 1.5 V ±1% to load; requires ≥2.2 µF ceramic capacitor on this node
5 (TAB)	Thermal pad / GND	Exposed copper pad soldered to PCB ground plane; mandatory for thermal performance and EMI reduction

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for automotive under-hood use (−40 °C to 125 °C) with PAT/SYL/SBL statistical testing
Logic-controlled shutdown	EN pin enables zero-power standby of subsystems - reduces total ECU sleep current by >100 µA per rail
Ultra-low 0.45 V dropout	Permits operation from partially discharged 12 V batteries (e.g., 9.5 V cranking) while maintaining 1.5 V core supply
±1% output accuracy	Ensures reliable MCU core voltage margin across temperature and line/load variations - avoids brown-out resets
2.2 µF ceramic stability	Eliminates board space and cost of bulk capacitance; compatible with high-reliability X7R/X5R MLCCs

Applications

Engine Control Unit (ECU)

Transmission Control Module (TCM)

Use Scenario: Powers 1.5 V core rail of 32-bit automotive MCU during cold-cranking (battery dips to 6–9 V).

IC Role / Device Role / Timing Role: Primary LDO regulator delivering clean, stable core voltage independent of input ripple and transients.

Use Value: 0.45 V dropout ensures uninterrupted operation down to 1.95 V input; AEC-Q100 qualification guarantees reliability in harsh under-hood environments.

Use Scenario: Supplies 1.5 V I/O interface for CAN transceivers and sensor signal conditioners in transmission mechatronics.

IC Role / Device Role / Timing Role: Local point-of-load regulator isolating sensitive analog/digital interfaces from noisy power domains.

Use Value: 82 dB PSRR at 120 Hz suppresses alternator ripple; ±1% accuracy maintains CAN bus timing margin across temperature.

Body Control Module (BCM)

Advanced Driver Assistance System (ADAS) Camera ECU

Use Scenario: Provides always-on 1.5 V rail for real-time clock and low-power wake-up logic in BCM sleep mode.

IC Role / Device Role / Timing Role: Shutdown-capable LDO enabling selective subsystem power gating via microcontroller GPIO.

Use Value: 50 µA OFF-mode current minimizes battery drain during weeks-long vehicle parking; EN pin eliminates need for external MOSFET switch.

Use Scenario: Regulates 1.5 V supply for image signal processor (ISP) core in rear-view camera module operating at −40 °C to 105 °C.

IC Role / Device Role / Timing Role: High-accuracy, thermally robust LDO meeting automotive thermal cycling and vibration requirements.

Use Value: R_thJC = 8 °C/W and −40 °C to 125 °C rating ensure ISP core remains within spec during extended high-temperature operation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV73315PDBVR	1.5 V, ±1%, 300 mA, 0.22 V dropout @ 300 mA; SOT-23-5 package; no AEC-Q100 qualification	Lacks automotive qualification and thermal derating data; limited to cabin/non-critical modules	Select only for non-automotive or interior-only designs where AEC-Q100 is not mandated
TPS78015QDRVRQ1	1.5 V, ±1%, 150 mA, 0.25 V dropout @ 150 mA; WSON-6 package; AEC-Q100 Grade 1 qualified	Lower output current (150 mA vs. 500 mA); insufficient for MCU core loads requiring >300 mA	Use only for low-current auxiliary rails (e.g., sensor biasing) where 500 mA headroom is unnecessary

Compared with TLV73315PDBVR and TPS78015QDRVRQ1, LF15ABDT-TR uniquely combines 500 mA output, 0.45 V dropout, AEC-Q100 Grade 1 qualification, and PPAK-5 thermal performance - making it the only viable choice for high-current, under-hood MCU core regulation.

Availability

LF15ABDT-TR is available at Aetrix Electronics and suitable for engine control units, transmission control modules, body control modules, and ADAS camera ECUs requiring stable component supply across automotive production lifecycles.

Supply support for LF15ABDT-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 silicon solutions for automotive, industrial, and power management applications.

LFXX is ST's automotive-qualified LDO family targeting under-hood and safety-critical power rails, emphasizing ultra-low dropout, precision output, and robust thermal performance in compact packages.

FAQ

What is the minimum input voltage required for LF15ABDT-TR to maintain 1.5 V output at 500 mA?

The dropout voltage is 0.4 V maximum at 500 mA per datasheet Table 3. Therefore, minimum input voltage = 1.5 V + 0.4 V = 1.9 V. However, absolute maximum ratings specify VI must be ≥2.5 V for guaranteed 500 mA operation - so practical minimum is 2.5 V to ensure full current capability and thermal safety.

Can LF15ABDT-TR be used without the enable pin connected?

Yes - the EN pin is active-high and has no internal pull-up. Leaving it open results in undefined state; ST recommends tying EN to IN via 100 kΩ resistor for default ON operation, or to GND for forced OFF. Direct floating is not advised due to potential noise-induced toggling.

Is the thermal pad (Pin 5) required to be soldered to PCB ground?

Yes - the TAB is electrically connected to GND and is essential for thermal performance. Datasheet Section 6.6 specifies the PPAK thermal pad must be soldered to a minimum 100 mm² copper pour tied to GND. Omitting this compromises R_thJA and risks thermal shutdown above 125 °C junction temperature.

Does LF15ABDT-TR require an input capacitor?

While not strictly required for stability, ST recommends a 0.1 µF ceramic capacitor close to the IN pin (per Figure 3 test circuit) to suppress high-frequency noise and improve transient response. This is especially critical when upstream supply is a switching converter with fast edge rates.

LF15ABDT-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:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 16V

Voltage - Output (Min/Fixed):: 1.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1V @ 200mA (Typ)

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

LF15ABDT-TR FAQ

1.How can I place an order for LF15ABDT-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for LF15ABDT-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 LF15ABDT-TR reliable?

The price and inventory of LF15ABDT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF15ABDT-TR is usually 5 days.

3.What payment methods are accepted for LF15ABDT-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF15ABDT-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LF15ABDT-TR?

LF15ABDT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LF15ABDT-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 LF15ABDT-TR?

For technical support, including LF15ABDT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF15ABDT-TR requirements.

6.How does Aetrix verify that LF15ABDT-TR is sourced from the original manufacturer or authorized distributors?

All LF15ABDT-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 LF15ABDT-TR meets industry standards.

7.What is the process for return or replacement of LF15ABDT-TR?

All LF15ABDT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF15ABDT-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 LF15ABDT-TR part is unused and in its original packaging.

Return procedure for LF15ABDT-TR:

1.Submit a request within 90 days.

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

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