Infineon TLE42744DV50ATMA1 5V Voltage Regulator: Datasheet, Pinout, Application Circuit, and Features
The Infineon TLE42744DV50ATMA1 is a robust and reliable low-dropout (LDO) voltage regulator designed to deliver a fixed, precisely regulated output voltage of 5V with a maximum output current of 450 mA. As a cornerstone component in automotive and industrial electronics, it ensures stable power supply to sensitive microcontrollers, sensors, and ICs, even in the harshest operating environments.
This regulator is engineered with a very low dropout voltage, typically 350 mV at 400 mA, allowing it to continue regulating effectively even when the input voltage dips very close to the 5V output level. Its key attributes include very low quiescent current consumption in both operational and standby modes, making it ideal for battery-powered applications where energy efficiency is critical.
Key Features
Output Voltage: 5 V ±2% accuracy
Output Current: Up to 450 mA
Low Dropout Voltage: Typically 350 mV (at 400 mA load)
Very Low Quiescent Current: Typically 40 µA in operation and 15 µA in standby mode
Wide Input Voltage Range: 5.5 V to 42 V
Integrated Protections: Reverse polarity protection, overcurrent protection, short-circuit protection, and overtemperature shutdown
Automotive Qualified: AEC-Q100 compliant, suitable for harsh environments
Enable Function: Allows for external control to switch the regulator into a low-power standby state
Pinout Configuration (PG-TO252-5-11)
The TLE42744DV50ATMA1 is housed in a 5-pin PG-TO252 package (also known as DPAK). The pinout is as follows:
1. IN: Input voltage pin. A capacitor must be connected between this pin and ground.
2. GND: Ground pin.
3. EN: Enable pin. A high-level signal (> 2 V) turns the regulator on; a low-level signal (< 0.8 V) puts it into standby mode.
4. Q/SS: Quiescent Control / Soft-Start pin. Connecting a capacitor to ground sets the soft-start time and controls the turn-on behavior.
5. OUT: Regulated 5V output pin. A capacitor must be connected between this pin and ground.
Application Circuit
A typical application circuit for the TLE42744DV50ATMA1 is straightforward, requiring only a few external components for stable operation.
Input Capacitor (C_IN): A ceramic capacitor (e.g., 100 nF to 1 µF) should be placed as close as possible to the IN pin and GND to suppress high-frequency noise. For automotive applications, a larger electrolytic or tantalum capacitor (e.g., 10 µF to 47 µF) is also recommended to handle load transients and input voltage surges.
Output Capacitor (C_OUT): A low-ESR output capacitor is essential for stability. A ceramic capacitor of at least 1 µF is required, but a value of 10 µF or more is typically used to improve transient response and stability. It must be connected between the OUT pin and GND.
Soft-Start Capacitor (C_SS): An optional capacitor can be connected from the Q/SS pin to GND to define the soft-start period, controlling the ramp-up of the output voltage and reducing inrush current during startup.
Enable Control: The EN pin can be tied directly to the input voltage (VIN) for always-on operation or connected to a microcontroller GPIO pin for digital control.
Datasheet Overview
The official datasheet provides comprehensive information necessary for design-in. It includes:
Absolute maximum ratings and thermal characteristics.
Detailed electrical characteristics tables under various conditions.
Typical performance graphs (dropout voltage, quiescent current, PSRR, etc.).
Application information and instructions for PCB layout to ensure optimal performance and thermal management.
The Infineon TLE42744DV50ATMA1 stands out as an exceptionally robust and efficient 5V LDO regulator. Its high input voltage tolerance and integrated protection features make it a premier choice for automotive and industrial systems where reliability is non-negotiable. The combination of low dropout, low quiescent current, and a minimal external component count provides designers with a simple yet powerful solution for creating stable and efficient power rails.
Keywords: Low-Dropout (LDO) Regulator, Automotive Grade, Reverse Polarity Protection, Quiescent Current, Voltage Regulation
