Linear voltage regulators for automotive applications

Infineon's OPTIREG™ portfolio of LDO voltage regulator ICs engineered for the demanding requirements of modern electronics

link

Compare families

About

What makes OPTIREG™ the right automotive LDO voltage regulator IC?

As automotive electronics grow more complex, so do the requirements for power supply precision and reliability. With decades of experience in automotive power management, Infineon designs OPTIREG™ LDO ICs specifically for the demanding conditions of modern vehicle architectures.

Infineon's OPTIREG™ low dropout (LDO) linear voltage regulators are AEC-Q100 qualified and purpose-built for automotive applications supplying loads, such as transceivers, microcontrollers, active antennas, and sensors. Their compact design and minimal external component count simplify customer integration.

They offer a broad range of integrated safety and protection features such as overload protection, short-circuit protection, reverse polarity protection, and overtemperature protection. Infineon automotive LDOs are also low-noise and low-consumption due to their low quiescent current.

 

Read more about automotive applications
Explore the sensors portfolio

Key differences between the automotive linear voltage regulator types

Infineon's OPTIREG™ portfolio groups automotive linear voltage regulators into three families, each optimised for a distinct performance requirement.

OPTIREG™ linear high-performance voltage regulators

Delivers output accuracy of ±2 % with output noise below 10 µV RMS (10 Hz-100 kHz) and PSRR exceeding 60 dB at 1 kHz. Input voltages up to 45 V, output currents up to 500 mA - suited - among others -  to microcontroller rails, memory domains, and communication bus references in automotive ECUs.

OPTIREG™ linear post regulators

Optimised for pre-post architectures pairing a DC/DC converter with a low noise LDO stage. Output currents up to 1,500 mA, dropout as low as 200 mV - used in ADAS platforms, domain controllers, and infotainment SoC supply trees.

OPTIREG™ linear voltage trackers

Replicate an external reference with accuracy as tight as ±0.1 % - 0.5 %, suited to supply off-board sensors. Integrated overvoltage, overtemperature, and reverse current protection for severe automotive environments.

OPTIREG™ LDO portfolio overview

Standard vs. high-power automotive voltage regulators: key differences

Low dropout (LDO) voltage regulators step down a higher input to a stabilised output, requiring only that the input exceeds the output by the dropout voltage - typically less than 200 mV. Unlike switching regulators, they cannot boost above the input, but deliver low noise and a minimal component count for straightforward ECU integration.

Standard LDO ICs cover most automotive supply rails: input up to 45 V, output up to 500 mA, temperature range -40 °C to +150 °C.

Low dropout linear voltage regulators can also function with a dropout range of less than 2 V. They offer a simple circuit layout consisting of very few components. While this makes them smaller and easy to use, they are less efficient than switching regulators and any unused energy will dissipate as heat from the regulator. To prevent possible overheating, Infineon's linear voltage regulators (LDO) have low quiescent currents and feature integrated thermal shutdown and overtemperature protection. They also offer additional safety measures, such as overvoltage and short-circuit protection, overload protection, and reverse polarity protection. 

Read more about transmission
Read more about ADAS

High-precision automotive LDO ICs: when output accuracy matters

The output accuracy is critical in two scenarios: when the supply rail is the reference itself, and when load noise directly affects signal quality.

OPTIREG™ voltage trackers are the specialist choice where the supply rail must mirror an external reference with accuracy as tight as ±0.1 % - 0.5 %. They carry no internal voltage reference, instead tracking an externally provided signal — enabling precise data acquisition for off-board sensors, satellite ECUs, and bridge supply rails in chassis and ADAS systems.

OPTIREG™ high-performance LDO ICs target direct battery-connected rails where output noise is a design constraint. With output noise below 10 µV RMS and PSRR exceeding 60 dB, they supply microcontroller cores, CAN transceivers, and on-board sensors where a clean voltage reference is essential for data integrity.

Reducing idle-mode power with low quiescent current LDOs

The quiescent current is another important characteristic of linear voltage regulators (LDO). A linear voltage regulator requires a low quiescent current to operate its internal circuit when the system is in standby mode. In this idle state, there is little to no output load required. However, the LDO will continue to draw a quiescent current. Quiescent current will generally dissipate in the form of heat while the system remains idle. 

Infineon offers a wide range of low quiescent DC current regulators (LDOs), including 3.3 V, 5 V, and ultra-low quiescent current LDOs. OPTIREG™ low quiescent current LDOs are well suited to always-on automotive domains such as standby wake-up controllers, TPMS, gateway ECUs, and remote keyless entry systems — where minimising sleep-state current is a system-level requirement.

Infineon smart power longevity program for linear voltage regulators

Automotive designs require long-term component availability. Infineon's smart power longevity program ensures planned long-term availability for the linear voltage regulator product portfolio and other automotive smart power products - enabling confident supply chain planning across the full vehicle lifecycle.

Find information relating to the planned long-term availability of semiconductor products “longevity” for automotive smart power products.

Learn more about our longevity program

What makes OPTIREG™ the right automotive LDO voltage regulator IC?

As automotive electronics grow more complex, so do the requirements for power supply precision and reliability. With decades of experience in automotive power management, Infineon designs OPTIREG™ LDO ICs specifically for the demanding conditions of modern vehicle architectures.

Infineon's OPTIREG™ low dropout (LDO) linear voltage regulators are AEC-Q100 qualified and purpose-built for automotive applications supplying loads, such as transceivers, microcontrollers, active antennas, and sensors. Their compact design and minimal external component count simplify customer integration.

They offer a broad range of integrated safety and protection features such as overload protection, short-circuit protection, reverse polarity protection, and overtemperature protection. Infineon automotive LDOs are also low-noise and low-consumption due to their low quiescent current.

 

Read more about automotive applications
Explore the sensors portfolio

Key differences between the automotive linear voltage regulator types

Infineon's OPTIREG™ portfolio groups automotive linear voltage regulators into three families, each optimised for a distinct performance requirement.

OPTIREG™ linear high-performance voltage regulators

Delivers output accuracy of ±2 % with output noise below 10 µV RMS (10 Hz-100 kHz) and PSRR exceeding 60 dB at 1 kHz. Input voltages up to 45 V, output currents up to 500 mA - suited - among others -  to microcontroller rails, memory domains, and communication bus references in automotive ECUs.

OPTIREG™ linear post regulators

Optimised for pre-post architectures pairing a DC/DC converter with a low noise LDO stage. Output currents up to 1,500 mA, dropout as low as 200 mV - used in ADAS platforms, domain controllers, and infotainment SoC supply trees.

OPTIREG™ linear voltage trackers

Replicate an external reference with accuracy as tight as ±0.1 % - 0.5 %, suited to supply off-board sensors. Integrated overvoltage, overtemperature, and reverse current protection for severe automotive environments.

OPTIREG™ LDO portfolio overview

Standard vs. high-power automotive voltage regulators: key differences

Low dropout (LDO) voltage regulators step down a higher input to a stabilised output, requiring only that the input exceeds the output by the dropout voltage - typically less than 200 mV. Unlike switching regulators, they cannot boost above the input, but deliver low noise and a minimal component count for straightforward ECU integration.

Standard LDO ICs cover most automotive supply rails: input up to 45 V, output up to 500 mA, temperature range -40 °C to +150 °C.

Low dropout linear voltage regulators can also function with a dropout range of less than 2 V. They offer a simple circuit layout consisting of very few components. While this makes them smaller and easy to use, they are less efficient than switching regulators and any unused energy will dissipate as heat from the regulator. To prevent possible overheating, Infineon's linear voltage regulators (LDO) have low quiescent currents and feature integrated thermal shutdown and overtemperature protection. They also offer additional safety measures, such as overvoltage and short-circuit protection, overload protection, and reverse polarity protection. 

Read more about transmission
Read more about ADAS

High-precision automotive LDO ICs: when output accuracy matters

The output accuracy is critical in two scenarios: when the supply rail is the reference itself, and when load noise directly affects signal quality.

OPTIREG™ voltage trackers are the specialist choice where the supply rail must mirror an external reference with accuracy as tight as ±0.1 % - 0.5 %. They carry no internal voltage reference, instead tracking an externally provided signal — enabling precise data acquisition for off-board sensors, satellite ECUs, and bridge supply rails in chassis and ADAS systems.

OPTIREG™ high-performance LDO ICs target direct battery-connected rails where output noise is a design constraint. With output noise below 10 µV RMS and PSRR exceeding 60 dB, they supply microcontroller cores, CAN transceivers, and on-board sensors where a clean voltage reference is essential for data integrity.

Reducing idle-mode power with low quiescent current LDOs

The quiescent current is another important characteristic of linear voltage regulators (LDO). A linear voltage regulator requires a low quiescent current to operate its internal circuit when the system is in standby mode. In this idle state, there is little to no output load required. However, the LDO will continue to draw a quiescent current. Quiescent current will generally dissipate in the form of heat while the system remains idle. 

Infineon offers a wide range of low quiescent DC current regulators (LDOs), including 3.3 V, 5 V, and ultra-low quiescent current LDOs. OPTIREG™ low quiescent current LDOs are well suited to always-on automotive domains such as standby wake-up controllers, TPMS, gateway ECUs, and remote keyless entry systems — where minimising sleep-state current is a system-level requirement.

Infineon smart power longevity program for linear voltage regulators

Automotive designs require long-term component availability. Infineon's smart power longevity program ensures planned long-term availability for the linear voltage regulator product portfolio and other automotive smart power products - enabling confident supply chain planning across the full vehicle lifecycle.

Find information relating to the planned long-term availability of semiconductor products “longevity” for automotive smart power products.

Learn more about our longevity program
Documents