Infineon TLE42702DATMA1 5V Low-Drop Voltage Regulator: Datasheet, Pinout, and Application Circuit Guide
The Infineon TLE42702DATMA1 is a robust 5V low-dropout (LDO) linear voltage regulator designed for the demanding environments of automotive and industrial applications. This component is engineered to provide a stable and precise 5V output from a higher input voltage, making it a fundamental building block for powering microcontrollers, sensors, and other logic circuits. Its key strengths lie in its very low current consumption and its comprehensive suite of integrated protection features.
This guide provides a detailed overview of its datasheet specifications, pinout configuration, and a typical application circuit to ensure a successful design-in.
Datasheet Overview and Key Specifications
The TLE42702DATMA1 is more than just a simple regulator; it is a fully integrated power supply IC. Here are the critical parameters extracted from its datasheet:
Output Voltage: Fixed, precise 5.0 V (±2% accuracy).
Output Current: Capable of delivering up to 450 mA of continuous output current.
Low Dropout Voltage: Typical dropout of only 400 mV at a full load of 450 mA. This means the input voltage only needs to be slightly above 5.4 V to maintain regulation, enhancing efficiency.
Very Low Quiescent Current: Features an ultra-low typical quiescent current of 18 µA in ON mode, which is crucial for battery-powered or always-on systems to minimize drain.
Protection Features: The device is exceptionally robust, integrating:
Overcurrent Protection: Limits output current during a short circuit.
Overtemperature Protection: Shuts down the device if the junction temperature exceeds safe limits.
Reverse Polarity Protection: Can withstand an input voltage reversed down to -42 V, a critical feature for automotive environments.
Overvoltage Protection (Load Dump): Can withstand transient input voltages up to 45 V.
Enable Function: The `EN` pin allows for external switching of the regulator, enabling power management and shutdown modes to reduce quiescent current further.
Pinout Configuration
The TLE42702DATMA1 is available in a PG-TO252-5-11 (DPAK-5) package. Its pinout is as follows:
1. IN (Pin 1): Input Voltage pin. A bypass capacitor must be connected between this pin and ground.
2. GND (Pin 2): Ground pin. The reference point for the regulator.
3. EN (Pin 3): Enable pin. Driving this pin high (> 2.0 V) turns the regulator ON. Pulling it low (< 0.8 V) switches the regulator into a standby mode with minimal quiescent current. It must not be left floating.
4. NC (Pin 4): No Connection. This pin is not internally connected.
5. OUT (Pin 5): Regulated 5V Output pin. A capacitor must be connected from this pin to ground for stability.
Typical Application Circuit Guide
A standard application circuit for the TLE42702DATMA1 is straightforward but requires specific external components for stable and reliable operation.
Required Components:
CIN: A 4.7 µF ceramic or tantalum capacitor placed close to the IN pin.
COUT: A 1 µF ceramic capacitor placed close to the OUT pin. This capacitor is critical for loop stability and must meet the specifications outlined in the datasheet.
REN: An optional pull-up resistor to the input voltage if the enable feature is not being actively controlled by a microcontroller. If actively controlled, the EN pin can be driven directly by a logic signal.
Circuit Operation:
The input voltage (VIN, e.g., 6V to 28V) is applied to the IN pin. The EN pin is pulled high to enable the regulator. The IC then provides a clean, regulated 5V output at the OUT pin, capable of supplying loads up to 450 mA. The integrated protection circuitry actively monitors conditions and will shut down the output to protect both the regulator and the downstream circuitry in case of a fault.
The Infineon TLE42702DATMA1 is an exemplary LDO regulator that combines high accuracy, ultra-low quiescent current, and exceptional robustness in a single package. Its comprehensive built-in protection against overcurrent, overtemperature, and reverse polarity makes it an ideal, worry-free choice for harsh electrical environments like automotive systems. Its simple application circuit and minimal external component count allow for a highly reliable and compact power supply solution.
Keywords:
Low-Dropout (LDO) Regulator, Automotive Grade, Reverse Polarity Protection, Quiescent Current, Application Circuit
