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

STMicroelectronics LF90ABPT-TR

Name: LF90ABPT-TR
Brand: STMicroelectronics
SKU: LF90ABPT-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LF90ABPT-TR

Manufacturer:: STMicroelectronics

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

Package:: TO-252-5, DPAK (4 Leads + Tab), TO-252AD

Datasheet:: LF90ABPT-TR.pdf

Description:: IC REG LINEAR 9V 500MA PPAK

Quantity:: RFQ Add To RFQ list

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Inventory:1,296

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Product details

Overview

LF90ABPT-TR from STMicroelectronics is a 9.0 V fixed-output, very low dropout (LDO) linear regulator in PENTAWATT-5 package with logic-controlled shutdown, delivering up to 500 mA output current, 0.45 V typical dropout at 200 mA, ±1% output voltage accuracy at 25°C, and operation across –40°C to +125°C junction temperature. It serves as a local power supply for microcontroller cores, sensor interfaces, and RF subsystems in battery-powered industrial and automotive modules.

For engineers reviewing the LF90ABPT-TR datasheet, LF90ABPT-TR pinout, LF90ABPT-TR application, or LF90ABPT-TR equivalent, this page delivers verified electrical specs, thermal performance data, shutdown control behavior, stability requirements (2.2 µF ceramic), and real-world use context - all aligned with ST's official LF00 series documentation (Rev. 17, May 2007).

Technical Context

The LF90ABPT-TR implements a PNP-based pass transistor architecture enabling ultra-low dropout voltage (0.45 V typ. at 200 mA) and high PSRR (80 dB typ. at 120 Hz). Its internal bandgap reference and error amplifier maintain tight output regulation under line/load transients while supporting TTL-compatible enable control (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) on Pin 2.

Thermal protection and current limiting are fully integrated; R_thJC = 3°C/W and R_thJA = 50°C/W (PENTAWATT-5) enable reliable operation at full load in ambient temperatures up to 85°C with minimal heatsinking. The device requires only a 2.2 µF output capacitor (ESR 0.1–10 Ω) for unconditional stability.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	9.0 V ±1% at 25°C - ensures precise biasing for 9 V analog rails and legacy logic interfaces
Dropout Voltage	0.45 V typ. at I_O = 200 mA - enables regulation from 9.45 V input, critical for single-cell LiFePO₄ or dual-cell alkaline systems
Quiescent Current	500 µA typ. in ON mode, 50 µA typ. in OFF mode - minimizes standby power loss in always-on monitoring nodes
Output Current	500 mA continuous - supports moderate-power peripherals like CAN transceivers or ADC drivers without external boost
PSRR	80 dB typ. at 120 Hz - suppresses ripple from upstream switching converters feeding the LDO input
Operating Temp	–40°C to +125°C junction - qualified for under-hood automotive and industrial motor control environments
Stability Cap	2.2 µF ceramic (ESR 0.1–10 Ω) - eliminates need for large tantalum or electrolytic capacitors, reducing board area and cost

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
Pin 1	Input (VI)	DC input supply rail (2.5–16 V); must be decoupled with ≥0.1 µF ceramic close to pin
Pin 2	Shutdown Control (VC)	TTL-compatible enable: <0.8 V = OFF (50 µA I_Q), >2.0 V = ON (500 µA I_Q)
Pin 3	Ground (GND)	Power ground return path; tied to exposed tab for thermal conduction
Pin 4	Output (VO)	Regulated 9.0 V output; requires 2.2 µF ceramic capacitor (X5R/X7R) between this pin and GND
Pin 5	Bypass (NC)	No-connect in standard LF90ABPT-TR configuration; left floating or grounded per layout best practice

Key Features

Feature	Design Value
Logic-Controlled Shutdown	Enables system-level power gating: reduces total board quiescent current by >90% when peripheral blocks enter sleep
Ultra-Low Dropout	0.45 V at 200 mA allows operation from marginal input sources (e.g., aging batteries or post-dropper supplies)
High PSRR	80 dB at 120 Hz rejects noise from switching regulators, preserving signal integrity in mixed-signal circuits
±1% Output Accuracy	Ensures consistent voltage margin for 9 V analog sensors and legacy ICs requiring tight tolerance
Internal Protection	Thermal shutdown and current limiting prevent damage during overload or short-circuit events without external components

Applications

Automotive Body Control Module

Industrial Sensor Node

Use Scenario: Powering LIN transceiver and door-lock actuator driver ICs in a centralized body controller.

IC Role / Device Role / Timing Role: Local 9 V LDO supplying stable bias to analog front-end and interface ICs; shutdown synchronized with vehicle sleep mode.

Use Value: Enables <50 µA system standby current via Pin 2 control, meeting ISO 11898-3 quiescent requirements.

Use Scenario: Regulating power for a wireless vibration sensor node with MEMS accelerometer and sub-GHz RF SoC.

IC Role / Device Role / Timing Role: Primary 9 V supply for analog signal chain and RF PA bias; low dropout extends battery life in intermittent transmit duty cycles.

Use Value: 0.45 V dropout allows operation down to 9.45 V input, extending usable range of two-series Li-ion packs by ~12%.

Medical Portable Monitor

Test & Measurement Front-End

Use Scenario: Providing clean 9 V rail to ECG amplifier stages and LCD bias circuitry in handheld diagnostic equipment.

IC Role / Device Role / Timing Role: Low-noise (50 µV RMS) local regulator isolating sensitive analog paths from digital supply noise.

Use Value: 80 dB PSRR at 120 Hz suppresses switching artifacts from DC/DC converters powering digital subsystems.

Use Scenario: Biasing precision op-amps and DAC reference buffers in portable calibrator instruments.

IC Role / Device Role / Timing Role: Fixed 9 V output with ±1% accuracy ensuring traceable voltage references for metrology-grade outputs.

Use Value: Tight initial tolerance eliminates need for post-manufacturing trimming, reducing calibration time and cost.

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 max, 170 mV dropout, DFN8 package	Not suitable for 9 V systems; limited current and voltage range	Select only if redesigning for lower-voltage, space-constrained applications with reduced load demand
LD3985M90R	9 V output, 500 mA, 200 mV dropout, SOT-223 package, no shutdown pin	Lacks logic-controlled shutdown; higher thermal resistance (R_thJA ≈ 120°C/W)	Choose when board space is constrained and system-level power sequencing is handled externally

Compared with LDL112PU33R and LD3985M90R, LF90ABPT-TR uniquely combines 9 V output, 500 mA capability, TTL shutdown control, and PENTAWATT thermal performance - making it irreplaceable in legacy 9 V industrial designs requiring robust, thermally efficient local regulation with active power management.

Availability

LF90ABPT-TR is available at Aetrix Electronics and suitable for automotive body controllers, industrial sensor nodes, portable medical monitors, and test equipment requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned reliability.

Supply support for LF90ABPT-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, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.

The LF00 series was developed specifically for ultra-low-dropout, low-quiescent-current regulation in battery-powered and thermally constrained systems - emphasizing simplicity (2.2 µF capacitor), reliability (integrated protection), and wide operating temperature range.

FAQ

What is the minimum input voltage required for regulation at full 500 mA load?

At 500 mA output, the maximum dropout voltage is 0.7 V (per Table 7–20, extrapolated for LF90AB). Therefore, minimum input voltage = 9.0 V + 0.7 V = 9.7 V. Below this, regulation is lost and output collapses proportionally with input.

Can LF90ABPT-TR be used without the shutdown pin connected?

Yes - Pin 2 (shutdown) may be tied directly to V_IN (≥2.0 V) for permanent ON operation. Leaving it floating is not recommended due to potential noise-induced toggling; ST specifies hard-wiring to V_IN or GND for deterministic behavior.

Is an input capacitor mandatory, and what value is recommended?

Yes - a minimum 0.1 µF ceramic capacitor (X5R/X7R) is required at the input (Pin 1) to suppress high-frequency noise and ensure stability. Larger values (e.g., 1–10 µF) improve transient response but are not required for basic functionality.

Does LF90ABPT-TR support ceramic output capacitors with zero ESR?

No - the datasheet specifies ESR range of 0.1–10 Ω for the 2.2 µF output capacitor. Zero-ESR ceramics (e.g., some C0G types) may cause instability; X5R/X7R dielectrics with inherent ESR meet the requirement and are industry-standard for this device.

LF90ABPT-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):: 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:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PPAK

LF90ABPT-TR FAQ

1.How can I place an order for LF90ABPT-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for LF90ABPT-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 LF90ABPT-TR reliable?

The price and inventory of LF90ABPT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF90ABPT-TR is usually 5 days.

3.What payment methods are accepted for LF90ABPT-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF90ABPT-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LF90ABPT-TR?

LF90ABPT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LF90ABPT-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 LF90ABPT-TR?

For technical support, including LF90ABPT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF90ABPT-TR requirements.

6.How does Aetrix verify that LF90ABPT-TR is sourced from the original manufacturer or authorized distributors?

All LF90ABPT-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 LF90ABPT-TR meets industry standards.

7.What is the process for return or replacement of LF90ABPT-TR?

All LF90ABPT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF90ABPT-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 LF90ABPT-TR part is unused and in its original packaging.

Return procedure for LF90ABPT-TR:

1.Submit a request within 90 days.

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

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