VNB49N04-E

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The VNB49N04-E is a power management integrated circuit belonging to the category of PMIC - Power Distribution Switches, Load Drivers. This IC is a four-channel power switch IC with power distribution, load driving and protection functions, as well as built-in under-voltage and over-voltage protection. It is mainly used in power supply design, automobile electronic control system and other fields.

The VNB49N04-E is composed of a power control peripheral circuit, control circuit and four main channel switching circuits with active discharge function. The control circuit mainly includes an enable pin, a voltage-controlled pin, and a power-on reset function. Its enable pin is used to control the enable or disable state of the entire IC. When enable pin is in low state, the entire IC will enter the disable state and output current is cut off; when enable pin is in high state, the corresponding switch channel will work normally. The voltage-controlled pin is used to control the device voltage, and when the voltage on this pin is lower than the set voltage, the entire IC will be reset and switch channel will be opened. This pin also has the detection and alarm and over-voltage protection functions. The power-on reset function is used to ensure that all channels are in the off state and will not have any current flow during power-on reset.

The power control peripheral circuit is mainly composed of four main channel switching circuits with active discharge function. Each channel includes an N-channel MOSFET for fast power distribution, and an active discharge circuit with lower resistance for actively discharging after power down. The active discharge resistor of each switching circuit is connected to an external circuit, and each channel can provide active discharge and switch functions.

The working principle of the VBN49N04-E is mainly based on the control of its enable pin, voltage-controlled pin and power-on reset function. When the enable pin is in low state, the entire IC will enter a disabled state and the output current is cut off. When the enable pin is in high state, the corresponding switch channel will work normally and the voltage-controlled pin is used to monitor and control the device voltage. When the voltage on this pin is lower than the set voltage, the entire IC will be reset, and the power-on reset function will ensure that all channels are in the off state and will not have any current flow during power-on reset. After reset, the switch circuit of each channel can provide active discharge and switch functions.

The VNB49N04-E is mainly used in power supply design, automobile electronic control system and other fields. Its active discharge function ensures that the switch circuit can be quickly switched on or off, and the power-on reset function ensures that the switch circuit will work normally. In addition, it has under-voltage and over-voltage protection functions, which can protect the circuit from damage caused by external environment and other unexpected conditions.

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