Infineon TLE4299GM 5-V Low-Drop Voltage Regulator: Datasheet, Pinout, and Application Circuits
The Infineon TLE4299GM is a monolithic integrated low-drop voltage regulator designed for a wide range of automotive and industrial applications. It provides a fixed, precisely regulated 5-V output voltage at a maximum output current of up to 250 mA. Its primary strength lies in its robust design, which incorporates essential protection features, making it an ideal choice for harsh electrical environments.
Key Datasheet Specifications and Features
A thorough review of the datasheet reveals the IC's core capabilities:
Output Voltage: Fixed at 5 V (±2% accuracy)
Output Current: Up to 250 mA
Low Dropout Voltage: Typically 200 mV at I_OUT = 100 mA, ensuring efficient operation even when the input voltage dips close to the output level.
Wide Input Voltage Range: From 5.5 V up to 42 V, with a transient survival capability up to 45 V, making it highly resilient to voltage spikes common in automotive systems.
Critical Protections: The device is equipped with over-current protection (OCP), over-temperature protection (OTP), and reverse polarity protection.
Low Quiescent Current: Features a low typical standby current, which is crucial for applications with always-on functions or those requiring low power consumption in standby mode.
Enable Function: An enable pin (EN) allows for external switching of the regulator, facilitating power management strategies to reduce overall system quiescent current.
Pinout Configuration (PG-DSO-8-37 package)
The TLE4299GM is typically housed in a PG-DSO-8 package. The pinout is as follows:
1. IN: Input voltage pin. A capacitor must be placed close to this pin for stability.
2. GND: Ground pin.
3. EN: Enable pin. Driving this pin high (> 2.0 V) turns the regulator on; driving it low (< 0.8 V) switches it into a low-power standby mode.
4. NC: No internal connection.
5. OUT: The regulated 5-V output. An output capacitor is required for stability.
6. OUT: Electrically identical to pin 5, providing two pins for improved current handling and heat dissipation.
7. OUT: Electrically identical to pin 5.
8. QReset (or RST): This open-drain reset output pin becomes active-low when the output voltage falls below a certain threshold, providing a power-on reset (POR) signal for microcontrollers.
Typical Application Circuits
The TLE4299GM is simple to implement. A basic application circuit requires only a few external components:
1. Input Capacitor (C_IN): A 100 nF ceramic capacitor should be placed as close as possible between the IN and GND pins to decouple high-frequency noise.
2. Output Capacitor (C_OUT): A minimum of 1 µF ceramic capacitor between OUT and GND is required for loop stability. Larger values (e.g., 2.2 µF to 10 µF) improve transient response.
3. Reset Delay Capacitor (C_D): Connected between the QReset pin and GND, this capacitor sets the reset delay time (t_RD) after the output voltage becomes stable. The value is chosen based on the desired delay (e.g., 100 nF for ~50 ms delay).
4. Pull-up Resistor (R_PU): A resistor (e.g., 10 kΩ to 100 kΩ) is required on the QReset pin to the microcontroller's supply voltage (often V_OUT) since it is an open-drain output.
For the enable function, the EN pin can be tied directly to IN for always-on operation or connected to a microcontroller's GPIO for controlled shutdown.
ICGOODFIND Summary
The Infineon TLE4299GM stands out as an exceptionally robust and reliable 5V LDO regulator. Its integrated protections, wide operating range, and built-in reset generation functionality make it a superior choice for powering critical components like microcontrollers, sensors, and ASICs in demanding applications, particularly in the automotive sector. Its simple implementation, requiring minimal external components, further simplifies system design and reduces the overall bill of materials.
Keywords: Low-Dropout Regulator, Automotive, Power Management, Reset Circuit, Voltage Spikes.
