MC79M15CTG

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The MC79M15CTG is an advanced linear voltage regulator that offers a combination of low voltage drop and high ripple rejection for high input voltage applications. It is a 3-terminal negative-voltage regulator with a fixed output voltage of -15V. The device features a low quiescent current of only 4.5mA and a maximum output current of 1.5A, making it ideal for battery-powered applications.

The MC79M15CTG is specifically designed to replace existing 5V or 7V voltage regulators as input voltage drops. The advantages of using this device is that it provides higher input voltage ranges and improved noise immunity. It also requires a significantly lower output capability than other similar devices. The features make the MC79M15CTG well-suited for use in applications such as distributed power architectures, automotive, industrial and consumer equipment.

The MC79M15CTG consists of a P-Channel Mosfet and Zener diode connected in series. The device has an unregulated input voltage of -24V to -15V and a regulated output voltage of -15V. It provides a three-state low drop-out performance with over-current and short circuit protection. The voltage drop is 1V to 1.5V at full load current and can be adjusted by varying the gate drive voltage. The device also features an internal current limiting circuit, which prevents the output voltage from dropping any lower than -14.5V. This prevents additional damage to the device, should it be subjected to an excessively high load current.

The MC79M15CTG utilizes a linear voltage regulator, which is one of the oldest, most popular and most cost-effective solutions for regulating output power. The circuit works by taking the unregulated input voltage and reducing it through a series of resistors and transistors until the desired output voltage is attained. For example, in the designed circuit shown below, an input voltage of -24V is reduced to -15V with a 1.2V voltage drop at the output.

The MC79M15CTG is an ideal solution for applications that require a reliable and efficient linear voltage regulator with excellent transient response and high ripple rejection. It is designed with an adjustable output current limit and an under-voltage lockout feature. This means that the voltage cannot be adjusted any lower than the specified level, resulting in improved system reliability. Additionally, the device has an extended operating temperature range and a wide input voltage range making it suitable for automotive applications as well. Furthermore, the device is RoHS compliant.

The MC79M15CTG is a reliable and flexible solution for low power applications that require an adjustable output voltage. With its ability to accept a wide input voltage range, high efficiency, low drop-out, and over-current protection, it can be used in many different applications, from consumer electronics to automotive to industrial applications. Additionally, its RoHS compliance makes it well-suited for these application areas.

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