MAX8559ETAO1+T

Current - Output:	300mA, 300mA
Base Part Number:	MAX8559
Supplier Device Package:	8-TDFN-EP (3x3)
Package / Case:	8-WDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Current, Over Temperature, Short Circuit
Control Features:	Enable
PSRR:	70dB ~ 54dB (10kHz ~ 100kHz)
Current - Quiescent (Iq):	290µA
Series:	--
Voltage Dropout (Max):	0.12V @ 100mA, -
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	2.6V, 1.85V
Voltage - Input (Max):	6.5V
Number of Regulators:	2
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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# MAX8559ETAO1+T application field and working principle## IntroductionThe MAX8559ETAO1+T is an ultra-low-power, low-dropout (LDO) linear regulator specifically designed to replace rechargeable battery-operated devices’ typical energy-consuming DC/DC converters. It offers a low quiescent current in all load conditions and provides excellent line- and load-transient performance. With its ultra-low power operation and low quiescent current, the MAX8559ETAO1+T is optimized for those applications that require minimum current consumption and maximum operating time from the battery. ## Key Features The MAX8559ETAO1+T features a wide input voltage range from 0.8V to 4.5V and an output voltage from 0.8V to 5V. It offers very low quiescent current in light-load conditions as well as low-dropout voltage (typically 80mV at 2mA). Compared to many other low-dropout linear regulators, the MAX8559ETAO1+T achieves a very low quiescent current (typically 500nA) with the ability to provide a greater than 100mA minimum output current. An integrated power-good flag increases system reliability and decreases the system costs. Other integrated features include overcurrent protection, EMI reduction, and reverse-current protection (when enabled).## Application fieldThe MAX8559ETAO1+T is widely used in many fields, such as commercial and industrial, military, and aerospace applications. It provides a stable output and reliable operation while delivering high efficiency, low quiescent current, and low-dropout voltage.The MAX8559ETAO1+T is well-suited for battery-powered applications requiring large output currents, such as portable radios, RF modules, telecommunication systems, and handheld devices. Additionally, it is the ideal solution for powering microcontrollers, DSPs, and memory devices.## Working principleThe MAX8559ETAO1+T works by setting the output voltage using a resistive-divider between the OUT pin and GND that is connected to the FB pin. This configuration allows the voltage on the FB pin to be set accurately to 0.8V, 2.5V, or 4.1V (depending on the application).The output voltage is regulated by an error amplifier with a high-gain PNP feedback, which detects the difference between the output voltage and the reference voltage, and then adjusts the PMOS transistor gate voltage drive to maintain the output voltage.The error amplifier compensates internally the output voltage for changes in load current, temperature and input voltage, to keep the output voltage regulated within 1%. The duty-cycle control loop keeps the output voltage current constant for varying input voltages and load currents.The PMOS transistor is protected by a current limit circuit to protect the device from overload. The current limit circuit is designed to limit the maximum current that can be drawn from the output to an external load, thus eliminating the need for a series current-limiting resistor.## ConclusionThe MAX8559ETAO1+T is an ultra-low-power, low-dropout linear regulator that offers an excellent line- and load-transient performance. It is optimized for those applications that require minimum current consumption and maximum operating time from the battery. It is well-suited for a wide range of commercial and industrial, military, and aerospace applications requiring large output currents. With its feedback-error amplifier, duty-cycle control loop, and current limit protection, the MAX8559ETAO1+T is the ideal solution for portable radios, RF modules, telecommunication systems, handheld devices, microcontrollers, DSPs, and memory devices.

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