Infineon TLS850B0TBV50ATMA1 50mA Low-Dropout Voltage Regulator: Datasheet, Pinout, and Application Circuit Design
The Infineon TLS850B0TBV50ATMA1 is a high-performance, 50mA low-dropout (LDO) voltage regulator designed for a broad range of automotive and industrial applications. Renowned for its exceptional accuracy and ultra-low quiescent current, this regulator provides a stable and clean 5.0V output voltage from an input voltage range of 5.5V to 42V. Its robust design makes it an ideal choice for powering microcontrollers, sensors, and other critical components in harsh electrical environments.
Key Features from the Datasheet
A thorough review of the datasheet reveals the standout characteristics of this LDO:
Output Voltage: Fixed, highly accurate 5.0V output with a typical accuracy of ±2%.
Low Dropout Voltage: Very low dropout voltage enables operation even when the input voltage is very close to the output level, enhancing efficiency.
Ultra-Low Quiescent Current: Features a remarkably low typical quiescent current (I_Q = 40 µA), which is crucial for battery-powered applications and reducing overall system power consumption.
Wide Input Voltage Range: Operates from 5.5V up to 42V, making it suitable for 12V and 24V automotive systems where load dump and transients are common.
Full Automotive Qualification: AEC-Q100 qualified, ensuring reliability and performance under stringent automotive conditions.
Integrated Protection Features: Includes comprehensive protection against over-current (OCP), over-temperature (OTP), and reverse polarity.
Pinout Configuration
The TLS850B0TBV50ATMA1 is available in a space-saving SOT-223 package with three pins and an integrated tab for enhanced thermal performance.
Pin 1 (IN): Input Voltage pin. A ceramic capacitor must be connected between this pin and ground for stability.
Pin 2 (GND): Ground pin.
Pin 3 (OUT): Regulated 5.0V Output pin. An output capacitor is required for stability.
Tab (GND): The metal tab is internally connected to the GND pin and should be soldered to the PCB's ground plane to improve heat dissipation.
Application Circuit Design
The typical application circuit for the TLS850B0TBV50ATMA1 is straightforward, yet proper component selection is vital for stable operation and noise performance.
Basic Circuit Configuration:
1. Input Capacitor (C_IN): A 1µF ceramic capacitor placed as close as possible to the IN and GND pins is recommended to suppress high-frequency noise and ensure stability. For applications with noisy input supplies, a larger bulk capacitor may be added.
2. Output Capacitor (C_OUT): A 1µF ceramic capacitor is required between the OUT and GND pins. This capacitor is critical for loop stability and improves the regulator's transient response. It must be placed very close to the regulator's pins.
3. Enable Control (EN Pin): While this specific variant (TLS850B0T) has a fixed enable, other versions in the family feature an enable pin. When used, it allows the regulator to be switched on/off via a logic signal, further reducing standby current when the system is inactive.
Design Considerations:
Thermal Management: Although the device has built-in OTP, ensuring adequate PCB copper area connected to the ground tab is essential for efficient heat dissipation, especially when operating at high ambient temperatures or with high input voltages.
Transient Protection: The wide input range inherently handles transients, but for extreme automotive transients (like load dump), additional external protection might be considered upstream.
ICGOOODFIND Summary
The Infineon TLS850B0TBV50ATMA1 is a robust, automotive-grade LDO regulator that excels in providing a stable voltage rail for noise-sensitive applications. Its combination of wide input range, low quiescent current, and integrated protection features makes it a superior and reliable choice for power supply design in demanding environments like automotive electronics, industrial control systems, and battery-powered devices.
Keywords: Low-Dropout Regulator, Automotive LDO, Quiescent Current, AEC-Q100, Voltage Regulation
