MC7806AECT

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The MC7806AECT is a three-terminal positive voltage, current limited, low dropout linear regulator with low noise and low power consumption. It is suitable for use in battery-powered applications such as cellular phones and personal digital assistants (PDAs). The MC7806AECT application field can be divided into three main areas: power distribution and conversion, communication, and automotive applications.

Power Distribution and Conversion

The MC7806AECT is well suited for providing power conversions in a variety of electronic circuits, including personal computer power supply architectures, line powered equipment, linear converters, AC-to-DC wall plug adapters, and other specialized applications which require a higher level of performance than conventional 3-terminal regulators.

The device can provide accurate outputs over a wide range of conditions, including over-voltage and reverse voltage protection, with low drop-out at high input voltages. The stand-by current is extremely low, and can be safely used for long periods of time. The MC7806AECT also features low quiescent current and low voltage ripple, resulting in improved efficiency and reduced system noise.

Communication.

The MC7806AECT is an ideal choice for providing power for a variety of communication systems, including 2G and 3G mobile phones, portable media players, and land mobile radios. The device provides low drop-out voltage and ripple, making it suitable for use in these systems. Additionally, the low quiescent current means that the device can be used to power systems that need to be powered over a long period of time, without draining the battery.

Automotive Applications

The MC7806AECT is also suitable for use in automotive applications, with the ability to provide accurate, low noise voltage regulation that is immune to shocks and vibrations. The device offers low quiescent current and low drop-out, making it suitable for powering automotive systems that may be exposed to harsh environments.

Principle of Operation

The MC7806AECT is a three-terminal positive voltage, current-limited linear regulator that operates as a low drop-out (LDO) regulator. The output voltage is controlled by the value of a single external feedback resistor, Rf, connected between the output pin and ground. An internal voltage reference voltage, REF, is compared with a feedback voltage on the output pin, and the resulting error is amplified by an internal error amplifier. The amplifier applies correction to the pass transistor gate voltage, controlling the output voltage directly.

The two-stage internal current limit circuit consists of a current sense amplifier and an internal power MOSFET. The current limit amplifier monitors the voltage across the current-sense resistor, RS, and produces a voltage proportional to the sense current. This which is then compared to an internal reference. If the sensed current exceeds the set limit, the current limit amplifier cuts off the power MOSFET gate voltage, shutting down the output.

The device features two modes of operation, Low Drop-Out (LDO) and Current Limit (CL). In LDO mode, the output is accurately regulated with minimal amount of drop-out voltage, while in CL mode, the current is limited to a maximum predetermined limit, allowing the regulator to protect itself and the load from transient events.

The MC7806AECT is designed to operate with a single-ended power supply, drawing an input voltage between 4.5 volts and 23 volts. The device also features over-voltage, under-voltage, and reverse voltage protection.

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