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

STMicroelectronics LF90CV

Name: LF90CV
Brand: STMicroelectronics
SKU: LF90CV
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LF90CV

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: LF90CV.pdf

Description:: IC REG LINEAR 9V 500MA TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:1,928

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Product details

Overview

LF90CV from STMicroelectronics is a very low-dropout linear voltage regulator with logic-controlled electronic shutdown, delivering 500 mA output current at 9.0 V nominal output voltage in PPAK package. It features 0.45 V dropout at 200 mA, 50 µA quiescent current in OFF mode, and ±2% output voltage accuracy (C grade) over -40 °C to 125 °C, designed for automotive local power domains requiring AEC-Q100 qualification.

For engineers reviewing the LF90CV datasheet, LF90CV pinout, LF90CV application, or LF90CV equivalent, this device is selected for battery-powered infotainment subsystems, ADAS sensor modules, and engine control unit (ECU) auxiliary rails where ultra-low quiescent current, thermal robustness, and TTL-compatible enable control are critical.

Technical Context

The LF90CV implements a PNP pass transistor architecture enabling sub-0.5 V dropout while maintaining stability with only 2.2 µF output capacitance (ESR 0.1–10 Ω). Its internal current and thermal limiting protect against overload and junction overheating under transient conditions.

It integrates a TTL-compatible inhibit input (Pin 2) that places the regulator in ultra-low-power OFF state (50 µA I_Q) when pulled low, allowing system-level power gating of downstream circuitry without external FETs or sequencing controllers.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	9.0 V ±2% at 25 °C (C grade), stable across -40 to 125 °C operating range
Dropout voltage	0.45 V typical at 200 mA load - enables operation with minimal headroom (e.g., 9.45 V input sustains 9.0 V output)
Quiescent current	50 µA in OFF mode, 500 µA in ON mode - reduces standby power in always-on automotive modules
Output current	500 mA continuous, internally current-limited to 1 A - supports mid-power microcontrollers and interface ICs
Supply rejection	82 dB at 120 Hz - suppresses ripple from noisy 12 V vehicle bus feeding downstream analog/RF circuits
Thermal protection	Integrated junction temperature shutdown - prevents damage during sustained overload or poor heatsinking
Capacitor requirement	Only 2.2 µF ceramic output capacitor required - eliminates bulk electrolytic, saves PCB area and cost

Pinout & Package

LF90CV is housed in a thermally enhanced PPAK (Power Package) with exposed thermal pad electrically connected to GND. The 5-pin configuration includes dedicated IN, OUT, GND, SHUTDOWN, and NC terminals.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 10.5–16 V DC input; internal clamp limits VI to 40 V absolute max
2 (SHDN)	Inhibit control input	TTL-compatible logic input: ≤0.8 V = OFF (50 µA I_Q), ≥2.0 V = ON (500 µA I_Q)
3 (GND)	Ground reference	Common return for input, output, and control; tied to exposed thermal pad
4 (OUT)	Regulated output	Delivers stable 9.0 V ±2% to load; requires 2.2 µF ceramic capacitor on this node
5 (NC)	No connect	Not internally bonded; must be left floating or grounded per layout best practice

Key Features

Feature	Design Value
AEC-Q100 qualified	Automotive-grade reliability: qualified to Grade 1 (-40 to 125 °C), with PAT/SYL/SBL statistical testing
Ultra-low OFF-mode IQ	50 µA shutdown current enables >1-year battery life in always-on telematics modules
Low-noise regulation	50 µV RMS output noise (10 Hz–100 kHz) preserves signal integrity for ADC references and RF bias rails
Robust thermal design	R_thJA = 100 °C/W (PPAK) and R_thJC = 8 °C/W - supports 500 mA continuous load with minimal heatsink
Wide input range	Operates from 10.5 V up to 16 V - compatible with 12 V automotive systems including cold-crank (6.5 V min not supported)

Applications

Infotainment Power Domain

ADAS Camera Module

Use Scenario: Local 9 V rail for display backlight driver and audio codec in head-unit.

IC Role / Device Role / Timing Role: Primary LDO supplying regulated 9 V to high-side LED drivers and Class-D amplifier stages.

Use Value: 0.45 V dropout allows operation during 12 V bus sag to 9.5 V; 50 µA OFF current extends sleep-mode battery life.

Use Scenario: Powering image signal processor (ISP) and MIPI serializer in rear-view camera.

IC Role / Device Role / Timing Role: Low-noise local regulator decoupling ISP core and analog front-end from noisy main 12 V domain.

Use Value: 50 µV output noise prevents quantization errors in 12-bit ADC; AEC-Q100 ensures field reliability.

Engine Control Unit (ECU) Auxiliary Rail

Body Control Module (BCM) Sensor Interface

Use Scenario: Dedicated 9 V supply for CAN transceiver bias and EEPROM programming circuitry.

IC Role / Device Role / Timing Role: Shutdown-capable LDO enabling selective power-down of non-critical ECU peripherals during key-off.

Use Value: TTL inhibit pin synchronizes with microcontroller GPIO to reduce total system quiescent draw below 100 µA.

Use Scenario: Powering Hall-effect position sensors and LIN transceivers in door module.

IC Role / Device Role / Timing Role: Stable 9 V source for precision analog sensor excitation and digital communication interfaces.

Use Value: ±2% output tolerance ensures consistent sensor sensitivity; 125 °C rating supports under-hood placement.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout automotive regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NCP1117ST90T3G	Fixed 9.0 V, TO-220 package, no shutdown pin, 1.2 V dropout at 800 mA, ±2% tolerance	Lacks logic-controlled inhibit; requires external MOSFET for power gating; higher thermal resistance (R_thJA = 50 °C/W)	Choose if board space permits TO-220 and shutdown is managed externally; not AEC-Q100 qualified
TPS7B6950QDCYRQ1	5.0 V fixed output, SOT-223, 350 mA, 300 mV dropout, AEC-Q100 Grade 1, integrated enable	Lower output voltage and current; unsuitable for 9 V loads; optimized for MCU core rails, not peripheral bias	Use only for 5 V applications; cannot substitute for 9 V requirement without redesign

Compared with NCP1117ST90T3G and TPS7B6950QDCYRQ1, LF90CV uniquely delivers 9 V output with AEC-Q100 qualification, 0.45 V dropout, and integrated TTL shutdown in PPAK - making it the only drop-in solution for automotive 9 V auxiliary rails requiring both low IQ and thermal efficiency.

Availability

LF90CV is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, engine control units, and body control modules requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for LF90CV 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, specializing in automotive, industrial, and power management ICs with broad manufacturing and quality infrastructure.

LF90CV belongs to the LFXX family of very low-dropout regulators engineered specifically for automotive power distribution - emphasizing thermal resilience, ultra-low quiescent current, and AEC-Q100 compliance in compact surface-mount packages.

FAQ

What is the minimum input voltage required for LF90CV to maintain regulation at full 500 mA load?

The minimum input voltage is calculated as V_OUT + V_DROP = 9.0 V + 0.45 V = 9.45 V (typical). At 500 mA, dropout rises to 0.7 V (max), requiring ≥9.7 V input. Below 9.45 V, output voltage drops linearly with input; operation below 10.5 V is not guaranteed per datasheet test conditions.

Can LF90CV be used without the SHDN pin connected?

Yes - leaving Pin 2 (SHDN) open or tying it to IN (VI) forces the device into permanent ON mode. However, doing so forfeits the 50 µA OFF-mode quiescent current benefit. For automotive applications, ST recommends pulling SHDN high via a 10 kΩ resistor to IN to ensure reliable startup.

Is an input capacitor required for LF90CV stability?

An input capacitor is not mandatory for stability but strongly recommended: 0.1 µF ceramic placed near the IN pin suppresses high-frequency noise and improves transient response. The datasheet specifies CI = 0.1 µF in all electrical characteristics test conditions and notes improved PSRR with its inclusion.

Does LF90CV support reverse-voltage protection on the output pin?

No - LF90CV lacks internal reverse-battery or reverse-output protection. If the output voltage exceeds the input (e.g., during hot-swap or backup battery scenarios), current can flow backward through the pass transistor, potentially damaging the device. An external series Schottky diode on the output is required for such use cases.

LF90CV Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Bulk

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:: Through Hole

Supplier Device Package:: TO-220

LF90CV FAQ

1.How can I place an order for LF90CV through Aetrix?

Please submit a Request for Quotation (RFQ) for LF90CV 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 LF90CV reliable?

The price and inventory of LF90CV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF90CV is usually 5 days.

3.What payment methods are accepted for LF90CV?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF90CV transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LF90CV?

LF90CV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LF90CV 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 LF90CV?

For technical support, including LF90CV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF90CV requirements.

6.How does Aetrix verify that LF90CV is sourced from the original manufacturer or authorized distributors?

All LF90CV 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 LF90CV meets industry standards.

7.What is the process for return or replacement of LF90CV?

All LF90CV units undergo pre-shipment inspection (PSI). If there is an issue with LF90CV, 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 LF90CV part is unused and in its original packaging.

Return procedure for LF90CV:

1.Submit a request within 90 days.

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

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