Linear voltage regulators for automotive applications
A full set of high-performance voltage regulators for wide range of applications
ST’s low-dropout (LDO) linear voltage regulators combine automotive-grade reliability, compact size, and efficient power management to help customers design robust and cost-effective systems. Built to meet the stringent requirements of the automotive market, these AEC-Q100 Grade 1 devices support a wide input voltage range and operate reliably across harsh temperature conditions from –40 to +125°C, with the L99VR0 series devices extending up to +175°C.
For customers, this means greater design flexibility, simplified integration, and dependable performance in space-constrained applications. Their versatility makes them a strong fit for a wide range of automotive systems, including ADAS, body control modules, electric vehicle battery management systems, powertrain, infotainment, and instrument clusters.
Key features
- Easy to implement, with fixed-output options for streamlined board design
- High PSRR and low noise for stable output voltages and sensitive loads
- Low quiescent current to help reduce power consumption in standby and sleep modes
- Compact, high-reliability packages including wettable flank-plated DFN options
- High thermal performance for dependable operation in harsh automotive conditions
- Expanded automotive LDO portfolio, including the L99VR0 and LDQ families
Optimize voltage regulation with a compact automotive LDO solution
Optimize voltage regulation with a compact automotive LDO solution
The LDQ44, LDQ40, LDH40 and LDL40 are designed for efficient power delivery in automotive applications, whether used in post-regulation stages or connected directly to the battery. They combine compact packaging, robustness and flexibility to support demanding system architectures while helping customers simplify design and maintain reliable voltage regulation
Enhance voltage management and reach functional safety requirements
Enhance voltage management and reach functional safety requirements
The L99VR0 series gives customers eight fixed and configurable output voltages from 0.8 V to 5 V, with up to 500 mA of load current. Whether used in post-regulation or connected directly to the battery, it helps reduce power-tree complexity, save board space, and simplify integration into demanding automotive designs.
This makes it easier to build compact, reliable systems while meeting functional safety requirements.
L99VR01
Automotive linear voltage regulator with configurable output voltage having 200 mA current capability
L99VR02J
Automotive linear voltage regulator with configurable output voltage having 500 mA current capability
L99VR02XP
Dual automotive linear voltage regulator with configurable output voltage (2x250 mA current capability)
L99VR03
Automotive low dropout linear voltage regulator having 300 mA of current capability
Ensure maximum efficiency and minimal power consumption
Ensure maximum efficiency and minimal power consumption
Our ultra-low dropout regulators help customers reduce power loss and improve overall system efficiency in automotive designs. With low quiescent current and low-noise performance, they are a strong fit for direct battery conversion and post-regulation, where stable voltage and low energy consumption are key.
Their compact packages, including DFN6 3 x 3 mm with wettable flanks, also make it easier to save board space and simplify integration in space-constrained applications.
Discover the Wettable Flanks (WF) plastic package
These packages feature a unique mounting-edge design with fillet termination, enabling automated optical inspection (AOI) to verify proper pad connection even after soldering, when the pad would otherwise be inaccessible. This helps customers improve assembly confidence, streamline inspection, and support high-reliability manufacturing.
Meet our automotive-grade LDO portfolio
How to test high-performance LDOs?
Designing with high-performance LDOs starts with the right evaluation and simulation flow. With eDesignSuite and eDSim, developers can quickly model analog circuits, explore operating conditions, and optimize their design before moving to hardware. This accelerates decision-making and reduces the risk of late-stage surprises.
For hands-on validation, ST offers dedicated evaluation boards such as STEVAL-QUADV01 for power management evaluation and AEK-POW-LDOV02X for dual linear voltage regulator testing. These boards help developers verify performance, compare configurations, and assess real-world behavior under automotive conditions, making it easier to move from concept to robust implementation.