What is input quiescent current?

What is input quiescent current?

Thus quiescent current, or IQ, is the current drawn by a system in standby mode with light or no load. The total dissipated power is equal to the input voltage minus the output voltage, multiplied by the output current, plus the input voltage multiplied by the quiescent current.

What is quiescent current transistor?

Quiescent current, for example, is the amount of current in a circuit with zero input signal voltage applied. Bias voltage in a transistor circuit forces the transistor to operate at a different level of collector current with zero input signal voltage than it would without that bias voltage.

Why we need to reduce quiescent current?

1. Quiescent current: the lower this current, the better the converter can preserve battery life at system standby mode. True shutdown: by blocking the current output from the input in shutdown, this capability improves efficiency and extends shelf life for end products.

Why is quiescent current important?

This is a particularly important concept in designing battery-operated systems such as wireless beltpack transmitters. Battery life is determined by the total current drain composed of quiescent current and load current. Quiescent current consumption should be as low as possible in order to prolong the battery’s life.

Why is the shutdown current important in a load switch?

the overall system power. The shutdown current is comprised of the FET leakage and controller circuitry that remains on like circuitry to protect the FET. The shutdown current is important when considering the overall system current. This is because when a load switch turns off a load, the shutdown current is the

How is the shutdown current of the adp160 LDO determined?

Shutdown current vs. temperature of the ADP160 LDO. The efficiency of an LDO is determined by the ground current and input/output voltages: For high efficiency, the headroom voltage and ground current must be minimized. In addition, the voltage difference between input and output must be minimized.

How does ground current affect the LDO efficiency?

Ground current (I GND) is the difference between the input and output currents, and necessarily includes the quiescent current. A low ground current maximizes the LDO efficiency. Figure 4 shows the ground current variation vs. load current for the ADP160 LDO.

Why does output voltage vary in regulated power supply?

The output voltage variation in a regulated power supply is due primarily to temperature variation of the reference voltage and the error amplifier. If discrete resistors are used to set the output voltage, the tolerance of the resistors may well be the largest contributor to overall accuracy.