LD6815TD/12P,125 Integrated Circuits (ICs)

Current - Output:	150mA
Base Part Number:	LD6815
Supplier Device Package:	5-TSOP
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Current, Transient Voltage
Control Features:	Enable
PSRR:	75dB (1kHz)
Current - Supply (Max):	150µA
Current - Quiescent (Iq):	35µA
Series:	--
Voltage Dropout (Max):	0.25V @ 150mA (Typ)
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.2V
Voltage - Input (Max):	5.5V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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LD6815TD/12P,125 application field and working principle

Linear voltage regulators are widely used in various types of electronic equipment to provide a constant output voltage despite changes in the load current or input voltage. LD6815TD/12P,125 is a very popular linear voltage regulator type, which is often used in embedded systems such as medical, industrial, and communication applications.

Application of LD6815TD/12P, 125 Regulator

LD6815TD/12P,125 is a low-dropout linear regulator designed for applications with low input voltage and low load current. It is suitable for use in embedded systems due to its wide input voltage range of 3.2 V up to 16V, and its low dropout voltage of 0.2V under no-load conditions. This device is also very efficient and provides a fixed output voltage of 12.5V, which can be used to power a wide variety of devices. Additionally, it has a very low quiescent current of only 1 µA and is capable of maintaining the set output voltage even with a three-times lower load current than its maximum load current.

Working principle of LD6815TD/12P,125

The LD6815TD/12P,125 is a linear voltage regulator that operates on the basic principle of voltage regulation. It has an input voltage that is applied across the input pins and a regulated output voltage that is provided on the output pins. The regulator works by controlling the ratio of input voltage to output voltage, known as the gain. The gain of a linear voltage regulator is determined by the ratio of the input voltage to the output voltage, which is known as the control voltage. The control voltage is generated using a voltage divider network consisting of two resistors with an adjustable voltage held at the junction point between them. This adjustable voltage is called the set-point voltage, and is set to the desired output voltage of the regulator. The input voltage is applied to the input pins of the regulator, and when the input voltage is higher than the set-point voltage, the regulator starts to operate. The regulator has an internal transistor, known as a pass element, which conducts current when the input voltage is higher than the set-point voltage. This current then passes through the regulator and out the output terminals and the output voltage is generated. The current conducted by the pass element is controlled by the difference between the input and output voltages. If the input voltage is lower than the set-point voltage, the transistor shuts off and no current flows through the regulator. This enables the regulator to maintain a fixed output voltage despite changes in the input voltage or load current.

Conclusion

LD6815TD/12P,125 is a very popular low-dropout linear voltage regulator. It is designed to provide a constant output voltage of 12.5V, despite changes in load current or input voltage. This device is suitable for use in embedded systems due to its wide input voltage range and low quiescent current, and its internal pass-element transistor enables it to maintain the output voltage despite changes in input or load conditions.

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