OPTIREG™ linear voltage regulators (LDO)

Portfolio of regular and high-power car voltage regulators

Low dropout (LDO) linear voltage regulators are simple ICs that can convert a wide range of direct input currents into a stabilized output current of a lower voltage. Linear regulators must always have an input voltage that is greater than the output voltage. For example, a 5 V automotive linear LDO could be used to convert a 12 V input current into a 5 V output current, but unlike switching regulators, these voltage levels cannot be reversed. Low dropout regulators can function with a dropout voltage of less a 2 V, which standard linear regulators cannot do.

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. 

Our high-performance linear automotive LDOs feature a wide input range and a temperature range of –40°C to +150°C. Linear voltage regulators (LDO) can be used for a broad range of automotive power supplies, such as EPS, transmission, body control modules, HVAC, dashboards, ADAS, telematics, and CAV.

Their robust design makes them particularly suited for use in harsh automotive environments. The OPTIREG™ portfolio implements several automotive-specific product features, including watchdog, early warning, and reset, all of which can help provide solutions to challenges faced by automotive designers.

Transmission

ADAS

Explore the different types of automotive linear voltage regulators

Infineon offers several types of linear voltage regulators (LDO) as part of the OPTIREG™ product series to ensure for straightforward, application-specific customer ICs design. This includes multiple variants of linear voltage regulators (LDO), including high-precision tracking linear voltage regulators, variable-linear voltage regulators, ultra-low quiescent current voltage regulators (LDO), and high-performance voltage regulators.

Linear voltage tracking and high-performance linear voltage regulator ICs

Linear voltage tracking regulators: These are high-precision voltage regulators designed to supply off-board loads for electronics, such as sensors, microphones, satellite ECUs, and small lamps. These types of linear regulators do not have their own internal voltage reference, so they must accurately track an externally provided voltage reference. The external voltage enables precise data acquisition from the sensor.

High-performance linear voltage regulator ICs: High-performance linear voltage regulators are designed for direct battery connection. They feature a wide input voltage range for extended performance. These types of linear voltage regulators are suitable for applications such as automotive on-board sensors, microcontrollers, CAN transceivers, microphones, and low-load LEDs.