ST offers a wide range of voltage regulators intended for automotive applications.
Featuring a set of LDO voltage regulators with 5 V and up to 500 mA load-current capability, the L49 series in BCD4 technology guarantees a very low dropout voltage of 400/500 mV and low quiescent current. Embedding additional features such as reset, watchdog and enable pins, together with short-circuit and thermal protections, these LDO regulators are suitable to supply microprocessor systems in automotive applications.
Designed to meet stricter line disturbance and noise rejection requirements, the L5 series in BCD5 technology ensures accuracy is kept over wide temperature range, line and load variations. These low dropout linear regulators also come with an early warning circuit that monitors the input voltage and compares it with an internal voltage reference.
The L99VR0 series in BCD9 technology offers 8 fixed and configurable output voltages from 0.8 to 5V and up to 500 mA load-current capability. Able to operate both in post regulation, attached to a pre-regulated voltage, or directly connected to battery, certain devices in this series feature enable, reset, autonomous watchdog, advanced thermal warning, fast output discharge and IShort control functions.
These products are suitable for all the automotive applications including power supplies in body modules, junction boxes, cluster instrumentation, sun roof, door modules, keyless entry, and sensors.
Precision post-regulation with LDK130, LD49100, and LD59100 LDOs
Low dropout regulators such as the LDK130, LD49100, and LD59100 are essential for post-regulation tasks in electronic circuits.
These LDOs are designed to provide a stable and precise output voltage, crucial for sensitive components that require clean power after initial voltage conversion stages. Their compact design and efficiency make the LDK130, LD49100, and LD59100 ideal for automotive applications where maintaining a consistent voltage is critical, ensuring reliable performance and offering features like ultra-low dropout voltage, high accuracy, and excellent load regulation.
How to directly convert from a car battery using LDL40, LDH40, and LDQ40 LDOs
Low dropout regulators (LDOs) are critical components for efficient voltage regulation in automotive applications.
The LDH40, LDL40, and LDQ40 are designed to efficiently manage the voltage regulation process, ensuring that the output voltage remains stable despite variations in the input voltage from the car battery.
These LDOs offer high current capability and low quiescent current, making them ideal where power efficiency and reliability are required.
Their robust design ensures they can handle the harsh conditions found in automotive environments, providing consistent performance and protecting sensitive electronic components from voltage fluctuations.
L99VR03: automotive low dropout linear voltage regulator
The L99VR03 is an automotive-grade LDO with a current capability of up to 300 mA, designed for high efficiency and reliability. It supports input voltages up to 40 V and offers output options of 3.3 V or 5 V with precision maintained at ±2 %. Its low quiescent current makes it ideal for standby microprocessor systems. The L99VR03 includes features like thermal shutdown, short-circuit protection, and an enable input, ensuring robust performance across a wide temperature range from -40 °C to 175 °C.
AEC-Q100 qualified, it is perfect for demanding automotive applications such as automotive MCU power supplies, body control modules, telematics control units, automotive head units, and headlights.
Dual linear regulator for automotive applications
The L99VR02XP is a low dropout dual linear regulator designed for automotive applications, packaged in a standard PowerSSO-36.
This LDO delivers an output current up to 2 x 250 mA and consumes a quiescent current as low as 1 μA per each output when the regulator is disabled. With an input tolerant up to 40 V to withstand load dumps and an operating input voltage range between 2.15 V and 28 V, the L99VR02XP ensures high output voltage accuracy (±2%) over a wide temperature range, line, and load variations.
Due to its robustness, energy efficiency, and versatility in output configurations, the L99VR02XP is ideal for automotive applications like MCU supply, battery-powered instruments, and sensor supply.
Advanced protection and monitoring features ensure reliability and safety under extreme operating conditions.
Developers can be supported in their designs by the AEK-POW-LDOV02X product evaluation board.