LE45CZ-TR

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Linear voltage regulator or linear regulator (LR) is a type of voltage regulator or AC to DC power supply that controls the output voltage or current by regulating the input voltage through the use of a series of series-connected linear resistors or transistors. The LR is classified under Power Management IC, Voltage Regulators. LE45CZ-TR is among the series LR offered by STMicroelectronics. It consists of two independent low-drop voltage regulators that can deliver up to 0.5A current from each channel. Its wide operating voltage is from 2V to 18V.

LE45CZ-TR Application Fields

The LE45CZ-TR is suitable for automotive applications such as general-purpose voltage regulator, level shifter, DC-DC converter, power supply noise suppresser, IC protection circuits, current monitor, automotive sound systems, and overcurrent detection circuits. It is typically used for engine control, chassis control, and comfort & convenience. In addition, the LE45CZ-TR is also suitable for LED lighting, motion sensor, industrial control, and telecom systems.

LE45CZ-TR Working Principle

The LE45CZ-TR works by regulating the output voltage or current in order to control the input voltage. Input is applied to the base of the series-connected transistor, which converts its impedance to a very small value. This small impedance provides a very high current path to the output terminal. This principle of regulation is called series regulation or series regulator. The current flow rate through the series regulator creates a voltage drop across its terminals. Thus, the output voltage is controlled for a wide range of input conditions. Voltage regulation is achieved through the following two modes:

• Regulated Feedback:In the regulated feedback mode, a feedback voltage from the output terminal is compared with a reference voltage. If the signal at the output falls below what is expected, the feedback voltage enables the voltage regulator to increase the input voltage to bring it back up, thus maintaining a constant output voltage.
• Ripple Rejection:In this mode, the voltage regulator will reject any voltage ripple or AC signal at the output by increasing or decreasing the input voltage. For example, if there is a large AC signal at the output, the regulator will increase or decrease the input voltage to reject the AC signal, thus keeping the output voltage constant.

Terminal Information of LE45CZ-TR

The LE45CZ-TR consists of two independent low-drop voltage regulator channels, each composed of five pins. It features an output voltage range of 0 to 16V and current capability of up to 0.5 A. Each of the two channels consists of two pins: the Vout pin is connected to the power supply of the application, while the GND pin is connected to the ground of the application. The other three pins are for input voltage (Vin), Enable (EN) and Adj (adjustment) to adjust the output voltage. The EN pin functions as an enabling/disabling or shutdown input pin. When the EN pin is high, the circuit is enabled; when it is low, the circuit is disabled, and the current is shut off. The Adj pin allows adjustment of the output voltage.

LE45CZ-TR Features & Benefits

The LE45CZ-TR offers several benefits to customers such as low-dropout voltage, 3.3V reference voltage for automotive applications, low quiescent current, power dissipation, and fast transient response. It provides an output voltage of 0 to 16V and current capability of up to 0.5 A. The low-dropout feature reduces input-output differential and power dissipation, which results in improved efficiency. In addition, the 3.3V reference voltage makes it easier to use in automotive applications. The low quiescent current makes the LE45CZ-TR suitable for powering portable and hand-held devices, since it requires very little power to run. The fast transient response keeps the output voltage stable during sudden changes in input voltage, minimizing output voltage excursions. The LE45CZ-TR also features external voltage setup with soft start, overcurrent protection, thermal shutdown and overvoltage protection, making it an ideal solution for automotive and other applications.

Conclusion

The LE45CZ-TR linear voltage regulator from STMicroelectronics is a highly efficient, low-drop voltage regulator for automotive and other applications. Its wide operating voltage range makes it suitable for a variety of applications, and its low-dropout, fast transient response, and other features make it an ideal choice for automotive and hand-held devices. Its EN pin allows for enabling/disabling or shutdown, while the Adj pin enables adjustment of the output voltage. The LE45CZ-TR is a highly efficient voltage regulator for automotive and other applications.

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