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

STMicroelectronics LF80ABV

Name: LF80ABV
Brand: STMicroelectronics
SKU: LF80ABV
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LF80ABV

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: LF80ABV.pdf

Description:: IC REG LINEAR 8V 500MA TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:3,965

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Product details

Overview

LF80ABV from STMicroelectronics is a 5.0 V fixed-output, very low dropout (LDO) linear voltage regulator in PENTAWATT-5 package with logic-controlled shutdown, 500 mA output current capability, ±1% output voltage accuracy at 25°C, and 0.45 V typical dropout at 200 mA. It serves as a local power supply for microcontroller cores, sensor interfaces, and battery-powered portable electronics requiring stable low-noise bias.

For engineers reviewing the LF80ABV datasheet, LF80ABV pinout, LF80ABV application, or LF80ABV equivalent, this page provides verified electrical specifications, thermal performance data, shutdown control behavior, stability requirements (2.2 µF ceramic output capacitor), and real-world use cases in automotive body control modules, industrial IoT edge nodes, and medical wearable power rails.

Technical Context

The LF80ABV implements a PNP 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 deliver tight load/line regulation (≤10 mV) across –40°C to +125°C junction temperature range.

Logic-compatible shutdown control (pin 2, TTL-level) enables system-level power sequencing and standby mode activation. The device integrates thermal shutdown and current limiting, and achieves stable operation with only 2.2 µF output capacitance (ESR 0.1–10 Ω), eliminating need for large electrolytic capacitors.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±1% at 25°C - ensures precise biasing for 5 V logic, ADC references, and analog front-ends without external trimming.
Dropout Voltage	0.45 V (typ.) at 200 mA - allows operation from 5.45 V input when regulating 5.0 V, maximizing battery runtime in single-cell Li-ion or dual-cell alkaline systems.
Quiescent Current	500 µA (ON), 50 µA (OFF) - minimizes standby power loss during system sleep, critical for always-on sensors and remote monitoring devices.
Output Current	500 mA continuous - supports moderate-power peripherals including CAN transceivers, display drivers, and multi-sensor hubs.
PSRR	80 dB (120 Hz), 71 dB (1 kHz) - suppresses switching noise from upstream DC-DC converters, preserving signal integrity in mixed-signal circuits.
Operating Temp	–40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and outdoor telecom equipment environments.
Stability Cap	2.2 µF ceramic (ESR 0.1–10 Ω) - reduces PCB footprint and cost vs. traditional 10–22 µF tantalum solutions while ensuring phase margin >45°.

Pinout & Package

PENTAWATT-5 (vertical mount, 5-pin) package with integrated heat sink tab (pin 3 connected to GND). Pin 1 = Input, Pin 2 = Shutdown (TTL-compatible), Pin 3 = Ground, Pin 4 = Output, Pin 5 = Bypass (not used in standard configuration; tied to GND or left open per design).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Input (VI)	Unregulated DC input (2.5–16 V); must be decoupled with ≥0.1 µF ceramic near pin.
Pin 2	Shutdown Control (VC)	TTL-compatible enable: <0.8 V = OFF (50 µA IQ), >2.0 V = ON (500 µA IQ); no pull-up required.
Pin 3	Ground (GND)	Power ground and thermal pad connection; requires low-impedance PCB copper pour for thermal dissipation.
Pin 4	Output (VO)	Regulated 5.0 V output; requires 2.2 µF ceramic capacitor (X5R/X7R) placed within 5 mm of pin.
Pin 5	Bypass (BP)	Internal bandgap reference bypass; connect to GND via 10 nF ceramic for improved noise rejection (optional).

Key Features

Feature	Design Value
Very low dropout	0.45 V at 200 mA enables operation from marginal input sources (e.g., aging batteries or post-DC-DC ripple).
Logic shutdown	Pin 2 accepts direct MCU GPIO control without level-shifting, simplifying power sequencing in embedded systems.
±1% output accuracy	Meets tight tolerance requirements for precision analog circuits and reference-sensitive ADCs without calibration.
Low-noise output	50 µV RMS noise (10 Hz–100 kHz) prevents interference in audio paths, sensor signal chains, and RF subsystems.
Thermal protection	Internally limits junction temperature to safe levels during overload or poor heatsinking, preventing catastrophic failure.

Applications

Automotive Body Control Module

Industrial IoT Sensor Node

Use Scenario: Powering LIN transceiver, door lock actuator MCU, and ambient light sensor in vehicle door module.

IC Role / Device Role / Timing Role: Local 5 V LDO supplying digital logic and analog sensing circuitry; shutdown synchronized with vehicle sleep mode.

Use Value: 50 µA OFF-mode current extends battery drain time during 14-day key-off period; 0.45 V dropout maintains regulation down to 5.45 V battery voltage.

Use Scenario: Regulating power for ARM Cortex-M4 MCU, LoRaWAN transceiver, and MEMS accelerometer in wireless vibration monitor.

IC Role / Device Role / Timing Role: Primary 5 V rail generator with MCU-controlled shutdown during sensor sampling intervals to reduce average system current.

Use Value: 2.2 µF ceramic stability cap saves >30% board area vs. legacy 10 µF tantalum; 80 dB PSRR isolates MCU from LoRa switching noise.

Medical Wearable ECG Front-End

POS Terminal Secure Element Supply

Use Scenario: Providing clean 5 V bias to instrumentation amplifier, 16-bit sigma-delta ADC, and Bluetooth LE radio in patch-style ECG monitor.

IC Role / Device Role / Timing Role: Low-noise analog supply rail; bypass pin (Pin 5) used with 10 nF cap to suppress digital coupling into analog path.

Use Value: 50 µV RMS output noise avoids degradation of 100 dB SNR ADC performance; ±1% accuracy ensures consistent gain calibration across production units.

Use Scenario: Powering secure element IC (e.g., STSAFE-A110) and smart card interface in payment terminal during transaction handshake.

IC Role / Device Role / Timing Role: Tamper-resistant 5 V supply with fast transient response (<10 µs) to handle cryptographic burst loads.

Use Value: 500 mA output headroom supports simultaneous secure element + contactless reader operation; thermal shutdown prevents overheating during prolonged authentication sequences.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LDL112PU50R	200 mA output, 0.35 V dropout (at 150 mA), DFN-6 package, no shutdown pin	Lower current, smaller footprint; unsuitable for 500 mA loads or shutdown-controlled systems	Select only if board space is constrained and load current ≤200 mA; requires external enable circuitry for shutdown.
LD3985M50R	500 mA output, 0.3 V dropout (at 200 mA), SOT-23-5 package, built-in shutdown	Same current rating but lower dropout; limited thermal performance (R_thJA = 200°C/W vs. LF80ABV's 50°C/W)	Prefer for compact designs with light thermal load; avoid in enclosed enclosures or >85°C ambient without derating.

Compared with LDL112PU50R and LD3985M50R, the LF80ABV offers superior thermal robustness (50°C/W R_thJA) and higher output current headroom, making it optimal for sustained 500 mA operation in thermally demanding automotive and industrial settings where reliability trumps miniaturization.

Availability

LF80ABV is available at Aetrix Electronics and suitable for automotive body control modules, industrial IoT sensor nodes, and medical wearable ECG front-ends requiring stable component supply with long-term lifecycle assurance.

Supply support for LF80ABV 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 consumer markets since 1987.

The LF00 series was developed specifically for ultra-low-dropout, low-quiescent-current power management in battery-constrained and thermally sensitive embedded systems, emphasizing reliability over wide temperature ranges and minimal external component count.

FAQ

What is the minimum input voltage required for LF80ABV to maintain 5.0 V output at 500 mA?

The LF80ABV requires VI ≥ VO + V_DROP. At 500 mA, maximum dropout is 0.7 V (per Table 9), so minimum input is 5.0 V + 0.7 V = 5.7 V. This ensures regulation across full temperature and process variation, not just typical conditions.

Can LF80ABV be used without the bypass capacitor on Pin 5?

Yes. Pin 5 (Bypass) is optional: leaving it open or connecting to GND has no adverse effect on basic regulation. Adding a 10 nF ceramic capacitor improves PSRR by ~5 dB above 10 kHz and reduces output noise in noise-critical analog rails.

Is the shutdown pin (Pin 2) 5 V tolerant when driven by a 3.3 V MCU GPIO?

Yes. VIH is specified as ≥2.0 V (min) across –40°C to +125°C, and VIL ≤0.8 V. A 3.3 V GPIO meets VIH with 1.3 V margin and will reliably enable the device; no level shifter is needed.

How does thermal performance differ between PENTAWATT-5 and TO-220FP packages for LF80ABV?

PENTAWATT-5 has R_thJC = 3°C/W and R_thJA = 50°C/W; TO-220FP has same R_thJC but R_thJA = 60°C/W. With identical PCB copper area, PENTAWATT delivers ~20% better ambient-to-junction thermal resistance, allowing higher continuous current in convection-cooled layouts.

LF80ABV Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 16V

Voltage - Output (Min/Fixed):: 8V

Voltage - Output (Max):: -

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

Current - Output:: 500mA

Current - Quiescent (Iq):: 1.5 mA

Current - Supply (Max):: 12 mA

PSRR:: 72dB ~ 57dB (120Hz ~ 10kHz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

LF80ABV FAQ

1.How can I place an order for LF80ABV through Aetrix?

Please submit a Request for Quotation (RFQ) for LF80ABV 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 LF80ABV reliable?

The price and inventory of LF80ABV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF80ABV is usually 5 days.

3.What payment methods are accepted for LF80ABV?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF80ABV transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LF80ABV?

LF80ABV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LF80ABV 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 LF80ABV?

For technical support, including LF80ABV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF80ABV requirements.

6.How does Aetrix verify that LF80ABV is sourced from the original manufacturer or authorized distributors?

All LF80ABV 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 LF80ABV meets industry standards.

7.What is the process for return or replacement of LF80ABV?

All LF80ABV units undergo pre-shipment inspection (PSI). If there is an issue with LF80ABV, 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 LF80ABV part is unused and in its original packaging.

Return procedure for LF80ABV:

1.Submit a request within 90 days.

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

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