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

STMicroelectronics LF90ABDT-TR

Name: LF90ABDT-TR
Brand: STMicroelectronics
SKU: LF90ABDT-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LF90ABDT-TR

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LF90ABDT-TR.pdf

Description:: IC REG LINEAR 9V 500MA DPAK

Quantity:: RFQ Add To RFQ list

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Inventory:1,534

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Product details

Overview

LF90ABDT-TR from STMicroelectronics is a very low-dropout linear voltage regulator with logic-controlled electronic shutdown, delivering 500 mA output current at 9.0 V ±1% (AB grade), featuring 0.45 V dropout at 200 mA and 50 µA quiescent current in OFF mode. It is an automotive-grade device in PPAK package, qualified to AEC-Q100, designed for local regulation in engine control units, body electronics, and infotainment power domains where standby power reduction is critical.

For engineers reviewing the LF90ABDT-TR datasheet, LF90ABDT-TR pinout, LF90ABDT-TR application, or LF90ABDT-TR equivalent, key selection criteria include its 9.0 V fixed output, TTL-compatible inhibit function (Pin 2), -40 °C to 125 °C operating junction temperature, 80 dB supply voltage rejection at 120 Hz, and minimal 2.2 µF output capacitance requirement for stability.

Technical Context

The LF90ABDT-TR implements a PNP pass transistor architecture enabling ultra-low dropout (0.45 V at 200 mA) and high PSRR (80 dB typ. at 120 Hz). Its internal current and thermal limiting protect against fault conditions without external circuitry.

The 5-pin PPAK configuration integrates a TTL-compatible inhibit input (Pin 2) that enables full electronic shutdown with 50 µA OFF-mode current, allowing system-level power gating in automotive modules. Output voltage accuracy is maintained at ±1% over temperature and load via precision bandgap reference and error amplifier compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	9.0 V ±1% at 25 °C - ensures stable MCU core or sensor biasing within tight tolerance across automotive temperature range.
Dropout Voltage	0.45 V at 200 mA - enables operation from 9.45 V input when V_OUT = 9.0 V, critical for cold-crank scenarios down to 6 V battery.
Quiescent Current	50 µA in OFF mode - reduces parasitic drain during vehicle sleep mode, extending battery life in always-on systems.
Output Current	500 mA continuous - supports multiple downstream ICs (e.g., CAN transceivers, ADCs, microcontrollers) from single local regulator.
PSRR	80 dB at 120 Hz - suppresses alternator ripple and switching noise from upstream DC/DC converters.
Stability Capacitor	2.2 µF ceramic (ESR 0.1–10 Ω) - eliminates need for bulky electrolytics, saving PCB area and improving reliability.
Operating Temp	-40 °C to 125 °C junction - meets AEC-Q100 Grade 1 requirements for under-hood and cabin-mounted ECUs.

Pinout & Package

LF90ABDT-TR is housed in a thermally enhanced PPAK (Power Package) with exposed thermal pad, optimized for high-power-density automotive applications. The 5-pin configuration includes dedicated INH pin for logic control.

Pin/Terminal	Circuit Role	Design Meaning
1 – IN	Input voltage supply	Accepts 9.45–40 V DC; internal clamp limits damage above 40 V; operates in shutdown when VI > 18 V.
2 – INH	Inhibit control input	TTL-compatible: <0.8 V = OFF (50 µA I_Q), >2.0 V = ON; enables board-level power domain gating.
3 – GND	Ground reference	Common return for input, output, and control; electrically connected to exposed thermal tab for heatsinking.
4 – OUT	Regulated output	Delivers 9.0 V ±1% up to 500 mA; requires only 2.2 µF ceramic capacitor for loop stability.
5 – TAB	Thermal pad / GND	Exposed copper pad soldered to PCB ground plane; provides primary thermal path (R_thJA = 100 °C/W).

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 qualified with PAT/SYL/SBL statistical testing - certified for safety-critical ECU use.
Low-noise regulation	50 µV RMS output noise (10 Hz–100 kHz) - avoids interference with sensitive analog sensors or RF receivers.
Robust protection	Internal current limit and thermal shutdown - eliminates need for external foldback or thermal sensors in compact designs.
Wide input range	2.5 V to 16 V operating input (up to 40 V absolute max) - accommodates 12 V battery transients including load dump.
High accuracy output	±1% initial tolerance (AB grade) over line, load, and temperature - reduces need for post-production calibration.

Applications

Engine Control Unit (ECU)

Body Control Module (BCM)

Use Scenario: Powering microcontroller, CAN transceiver, and analog front-end in diesel/gasoline ECU under hood.

IC Role / Device Role / Timing Role: Local 9.0 V LDO supplying critical subsystems; INH pin synchronized with ECU sleep/wake state.

Use Value: 50 µA OFF current prevents battery drain during 30-day parking; 0.45 V dropout sustains regulation during 6 V cold-crank.

Use Scenario: Regulating power for door module MCU, window motor driver, and LIN transceiver.

IC Role / Device Role / Timing Role: Primary 9.0 V supply with logic-controlled shutdown during vehicle sleep mode.

Use Value: Enables BCM to meet ISO 19453 low-power requirements; 2.2 µF CO saves space vs. legacy 10 µF tantalum solutions.

Infotainment Head Unit

Advanced Driver Assistance (ADAS) Camera Module

Use Scenario: Providing clean 9.0 V rail for audio codec, display timing controller, and touch controller.

IC Role / Device Role / Timing Role: Low-noise local regulator decoupling switching DC/DC outputs; PSRR >80 dB suppresses SMPS ripple.

Use Value: 50 µV output noise prevents audible artifacts in Class D amplifiers and visual noise on TFT displays.

Use Scenario: Powering image sensor, ISP, and serializer in rear-view or surround-view camera.

IC Role / Device Role / Timing Role: Stable 9.0 V source with fast transient response for pixel clock integrity and low-jitter ADC sampling.

Use Value: ±1% output accuracy ensures consistent sensor biasing across -40 °C to 105 °C ambient, reducing image gain drift.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LDL112PU33R	3.3 V output, 200 mA, 170 mV dropout, SOT-323 package	Lower current and voltage; not automotive-qualified	Select only for non-automotive 3.3 V logic rails with space constraints.
TLD1120-12ES	12 V output, 1.2 A, 250 mV dropout, TO-252 package, integrated enable	Higher current, wider input range (4.5–40 V), but ±2% tolerance and no AB-grade accuracy	Prefer for 12 V systems needing higher drive; avoid where 9 V and ±1% are mandatory.

Compared with LDL112PU33R and TLD1120-12ES, LF90ABDT-TR uniquely delivers 9.0 V ±1% accuracy, 500 mA capability, and AEC-Q100 qualification in a thermally efficient PPAK package-making it irreplaceable for automotive 9 V power domains requiring precision, low quiescent current, and robustness.

Availability

LF90ABDT-TR is available at Aetrix Electronics and suitable for engine control units, body control modules, infotainment head units, and ADAS camera modules requiring stable component supply across extended temperature and automotive lifecycle demands.

Supply support for LF90ABDT-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 analog devices.

LF90ABDT-TR belongs to the LFXX family of very low-dropout regulators engineered specifically for automotive power domains requiring high accuracy, ultra-low quiescent current, and AEC-Q100 compliance in compact thermally enhanced packages.

FAQ

What is the minimum input voltage required for regulation at 9.0 V output?

The LF90ABDT-TR maintains regulation as long as input voltage exceeds output voltage by the dropout voltage. At 200 mA load, dropout is 0.45 V, so minimum input is 9.45 V. At 500 mA, typical dropout is 0.7 V, requiring ≥9.7 V input. Below 9.45 V, output drops linearly with input.

How is thermal performance affected when the TAB pin is not soldered to a PCB ground plane?

Leaving the TAB unsoldered increases R_thJA from 100 °C/W to >200 °C/W, causing junction temperature to rise rapidly under load. At 500 mA, this can trigger thermal shutdown within seconds. STMicroelectronics mandates full soldering of the TAB to a minimum 200 mm² copper pour for reliable operation.

Can the INH pin be left floating, or does it require a pull-up/down resistor?

The INH pin must never be left floating. It has no internal pull-up/down. For default-ON operation, connect INH to IN via a 10 kΩ resistor. For default-OFF, tie INH to GND. Floating INH causes undefined state, potentially leading to erratic ON/OFF transitions and output instability.

Does LF90ABDT-TR support reverse-polarity input protection?

No. LF90ABDT-TR lacks internal reverse-polarity protection. Applying negative voltage to the IN pin-even briefly-can damage the internal PNP pass transistor. External protection (e.g., series Schottky diode or ideal diode controller) is required in systems prone to battery reversal or jump-start events.

LF90ABDT-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):: 9V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.7V @ 500mA

Current - Output:: 500mA

Current - Quiescent (Iq):: 1.5 mA

Current - Supply (Max):: 12 mA

PSRR:: 71dB ~ 56dB (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

LF90ABDT-TR FAQ

1.How can I place an order for LF90ABDT-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for LF90ABDT-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 LF90ABDT-TR reliable?

The price and inventory of LF90ABDT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF90ABDT-TR is usually 5 days.

3.What payment methods are accepted for LF90ABDT-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF90ABDT-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LF90ABDT-TR?

LF90ABDT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LF90ABDT-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 LF90ABDT-TR?

For technical support, including LF90ABDT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF90ABDT-TR requirements.

6.How does Aetrix verify that LF90ABDT-TR is sourced from the original manufacturer or authorized distributors?

All LF90ABDT-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 LF90ABDT-TR meets industry standards.

7.What is the process for return or replacement of LF90ABDT-TR?

All LF90ABDT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF90ABDT-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 LF90ABDT-TR part is unused and in its original packaging.

Return procedure for LF90ABDT-TR:

1.Submit a request within 90 days.

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

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