NCV8752AMX33TCG

## Overview

The onsemi NCV8752AMX33TCG is a highly integrated, automotive-grade voltage regulator specifically designed to provide a stable 3.3 V output for microcontrollers, sensors, and other electronic loads in automotive applications. It is part of onsemi’s NCV875x family, which targets reliability in harsh automotive environments and supports ISO 26262 functional safety requirements. This device incorporates features such as low dropout operation, high output accuracy, low quiescent current, and robust protection mechanisms, making it suitable for use in body electronics, advanced driver-assistance systems (ADAS), infotainment, and other in-vehicle electronic subsystems.

## Electrical Characteristics

The NCV8752AMX33TCG operates over a wide input voltage range from 4.5 V to 40 V, supporting both battery and alternator voltage variations common in automotive systems. It delivers a regulated output voltage of 3.3 V with a tight initial accuracy of ±2%, ensuring proper operation of sensitive downstream components. The regulator can provide continuous output current up to 150 mA, sufficient for low-power microcontrollers and sensor circuits. Its low dropout voltage, typically 180 mV at full load, ensures efficient operation even when the input voltage is close to the output voltage.

The device exhibits a low quiescent current of approximately 25 μA in normal operation and reduces further under standby conditions, contributing to minimal battery drain when the vehicle is in sleep mode. Line regulation is typically 0.2% over the full input voltage range, and load regulation is around 0.5% for variations from 0 to 150 mA, guaranteeing stable voltage delivery under dynamic operating conditions.

## Protection Features

NCV8752AMX33TCG incorporates multiple protection mechanisms to ensure device and system reliability:

* Overcurrent Protection (OCP): The device limits output current in case of overload or short-circuit conditions, preventing damage to both the regulator and downstream circuitry. The OCP threshold is internally set and designed to restart automatically once the fault condition is removed.
* Thermal Shutdown (TSD): Integrated thermal monitoring disables the output when junction temperature exceeds approximately 150°C, preventing thermal overstress. Once the device cools down, normal operation resumes automatically.
* Reverse Battery Protection: The device can withstand reverse polarity connections on the input, protecting the regulator and system components from accidental reverse voltage events common in automotive installations.
* Load Dump Tolerance: The regulator is designed to withstand transient voltage spikes, including those generated by load-dump events in automotive environments, meeting ISO 7637-2 transient immunity requirements.

## Functional Features

* Low Dropout Operation: Ensures the device maintains a regulated output even when the input voltage is near the output voltage, which is critical in automotive applications with fluctuating battery voltages.
* Enable Function: The regulator features an active-high enable pin, allowing system-level control to reduce power consumption when the output is not needed.
* Low Noise: With integrated noise suppression techniques, the device delivers a low-noise output suitable for analog and sensor applications.
* Fast Transient Response: The regulator can respond quickly to sudden load changes, maintaining voltage within specified tolerances to support reliable microcontroller and sensor operation.

## Packaging and Thermal Considerations

The NCV8752AMX33TCG is supplied in a compact SOT-23-5 package, providing a small footprint suitable for dense automotive PCBs. The package design ensures efficient thermal dissipation, with a maximum junction-to-ambient thermal resistance of approximately 200°C/W under standard PCB layout conditions. Proper layout, including thermal vias and sufficient copper area, is recommended to maintain junction temperature within safe operating limits when the device delivers maximum output current in high ambient temperatures.

## Application Considerations

* Decoupling Capacitors: A low-ESR capacitor (typically 1 μF to 10 μF) is recommended on the output to maintain stability and optimize transient response. Input bypass capacitors of similar values help filter supply noise and improve regulator performance.
* Automotive Reliability: The device complies with AEC-Q100 Grade 1 standards, making it suitable for use in engine bay and other high-temperature automotive environments.
* Functional Safety: NCV8752AMX33TCG supports system-level functional safety by offering predictable failure modes and thermal protection features, which are critical for automotive electronics adhering to ISO 26262 requirements.
* System Integration: Its combination of high input voltage tolerance, low quiescent current, and tight output regulation makes it ideal for powering microcontrollers, communication modules, sensors, and low-power analog circuits in automotive body control modules, infotainment systems, and ADAS sensor hubs.

## Key Specifications Summary

* Input voltage range: 4.5 V – 40 V
* Output voltage: 3.3 V ±2%
* Maximum output current: 150 mA
* Dropout voltage: typically 180 mV at full load
* Quiescent current: 25 μA typical
* Line regulation: 0.2%
* Load regulation: 0.5%
* Operating temperature range: -40°C to +125°C junction
* Overcurrent and thermal shutdown protection included
* Reverse battery and load-dump tolerant
* Package: SOT-23-5

The NCV8752AMX33TCG is engineered to meet the demanding requirements of automotive systems by combining precision voltage regulation, low-power operation, robust protection, and compact packaging. It provides designers with a reliable solution for powering low-voltage electronics in vehicles, ensuring system stability and longevity under harsh conditions.