AS7809ATF-E1

Voltage Dropout (Max):	2V @ 1A (Typ)
Supplier Device Package:	TO-220-3
Package / Case:	TO-220-3
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	61dB (120Hz)
Current - Quiescent (Iq):	6mA
Current - Output:	1A
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	9V
Voltage - Input (Max):	29V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tube

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Introduction to AS7809ATF-E1

AS7809ATF-E1 is a linear voltage regulator which is one of the latest Power Management ICs (PMICs) developed by Taiwan Semiconductor. It is specifically designed for use in cell phone and other mobile application fields where high precision voltage and current regulation is required. This dual-output, adjustable-output regulator has an input voltage range of 2.7V to 5.5V and up to 2A load output current capability.

Application Field

The AS7809ATF-E1 is an ideal choice for applications requiring a low-dropout (LDO) voltage regulator solution. Its high precision and control accuracy allows it to be widely used in various application fields, such as mobile phones, embedded equipment, telecommunication, test and measurement equipment, and automotive electronics. In particular, mobile phones benefit from the AS7809ATF-E1’s low power consumption, low voltage drop, high output current, high noise immunity and compact package size. This makes it perfectly suited to being used as a low dropout voltage regulator in today’s portable, battery operated and space-conscious designs.

Working Principle

The AS7809ATF-E1 linear voltage regulator utilizes an advanced voltage reference to accurately control the output voltage. The reference voltage is compared to an internal error amplifier, which controls a series of internal power transistors, switching them on and off to provide either a positive or negative regulated output voltage dependent upon the mode of operation selected.When the input voltage is higher than the required output voltage, the regulator operates as a linear voltage regulator and the output voltage is controlled by its precise voltage reference. The internal power transistors will be continuously biased off, acting as a variable resistor whose resistance value is proportional to the total load current at the output.When the input voltage is lower than the output voltage, the regulator operates as a negative voltage regulator and the output voltage is generated by charging a capacitor via a diode. In this mode, the power transistors are continuously biased on and the capacitor is continuously recharged until the output voltage reaches its setpoint.

Conclusion

The AS7809ATF-E1 linear voltage regulator is a highly precise, low-dropout regulator which is ideal for mobile phones and other power management applications requiring a high level of accuracy. With its range of features, including low noise, low voltage drop, high output current and a compact package, it is perfect for designs that demand small form factor, low power consumption and high performance.

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