OPTIREG™ linear voltage regulators (LDO)
Robust automotive linear voltage regulators (LDO)
OPTIREG™ linear voltage regulators (LDO) subcategories
OPTIREG™ automotive LDO offer quality and best-in-class technology
As the automotive industry continues to grow, so does the demand for safety and quality when it comes to automotive technology. With a long-standing history as a market leader in automotive electronics, Infineon is constantly developing best-in-class products that provide solutions to a range of consumer applications.
Infineon's OPTIREG™ low dropout (LDO) linear voltage regulators combine quality and technology to provide simple power supply solutions. They are specially designed for automotive applications with loads, such as transceivers, microcontrollers, active antennas, and sensors. Our linear automotive voltage regulators (LDO) are made up of small components in a simple layout and are easy to use for straightforward customer design.
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.
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, a temperature range of –40°C - +125°C, and feature integrated thermal shutdown and overtemperature protection. They also offer additional safety measures, such as overvoltage and short-circuit protection, load protection, and reverse polarity protection.
Our high-performance linear automotive LDOs feature a wide input range and a temperature range of –40°C - +160°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.
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.
Unlike switching voltage regulators, low quiescent current regulators (LDO) cannot be used with buck or boost converters. Buck and boost converters enable the regulators to “step down” or “step up” the voltage respectively. These cannot work with linear voltage regulators as the input voltage must always remain greater than the output voltage.
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.
Low dropout linear and variable linear voltage regulators
Low voltage linear: Infineon's OPTIREG™ product family features a wide range of low dropout (LDO) linear voltage regulators. A dropout voltage indicates the lowest input voltage at which a linear regulator will function. Unlike standard linear voltage regulators, low dropout regulators can function with a dropout voltage of less than 2 V.
Variable linear: Infineon offers a selection of variable linear voltage regulators (LDO) (also called adjustable voltage regulators), which are suitable for industrial applications. This type of linear voltage regulators convert an input voltage within a specific range to an output voltage required by the load. The output voltage is adjustable which makes low dropout adjustable voltage regulators a highly flexible option for system designers.
Low quiescent linear voltage regulators (LDO)
The quiescent current is another import 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 for preparation of a load. 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. Regulators with a low quiescent current are useful for a variety of applications, as they consume less energy and extend the lifespan of battery-operated systems.
Find information relating to the planned long-term availability of semiconductor products “Longevity” for Automotive Smart Power products.
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For more information on automotive linear voltage regulators from Infineon, and other electronic components within our range explore our support section.
| Key Features | Key Benefits |
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- Automotive General Modules
- Internal combustion drivetrain
- Body & Convenience
- Safety Applications
- Low Power ECU’s
- Infotainment / ADAS
- Active Antenna: Power Supply and Function
- Truck, Agriculture & Transportation
- Seat Control Module
- E-Bikes
- Small Electric Vehicles
