MAX8883EUTA5+T

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The MAX8883EUTA5+T is a low-voltage linear voltage regulator with a selection of output voltages optimized for single-cell Li-ion/Li-polymer battery applications. The MAX8883EUTA5+T\'s excellent output voltage accuracy of up to 0.5% and its low quiescent current of 30μA ensure accuracy and low power consumption. The device provides excellent load and line transient response and a minimum load current of 10μA.

The MAX8883EUTA5+T regulates output voltage in a buck-boost topology, which allows it to step-up, step-down, or provide a fixed output voltage from a source that can be higher, lower, or equal to the output voltage. The device includes an adjustable voltage output, which is set by the external resistors. Additionally, the MAX8883EUTA5+T provides a digital enable/shutdown and current limiting, as well as reverse-battery protection. The digital enable/shutdown decreases current consumption to 0.1μA during shutdown while maintaining the output voltage.

Application areas

The MAX8883EUTA5+T is ideal for single-cell Li-ion/Li-polymer battery applications due to its low 145mV dropout voltage. This allows the buck-boost conversion to take place even with a relatively low input voltage, making the MAX8883EUTA5+T suitable for charging and powering portable systems, such as cellular phones, PDAs, and digital cameras. In addition, the device is suitable for handheld battery-powered systems, such as remote controls and toys, as well as medical and other industrial applications.

Working principle

The MAX8883EUTA5+T is a linear voltage regulator that operates in a buck-boost topology, meaning that it can step up, step down, or maintain a fixed output voltage from a higher, lower, or equal input voltage. The device consists of an internal oscillator, a current limit amplifier, a pulse-width-modulated (PWM) MOSFET switch, and a voltage feedback amplifier.

The MAX8883EUTA5+T\'s operation is simple. When the output voltage is lower than the set point, the internal oscillator cycles to turn the MOSFET switch on, allowing current to flow through the switch. This increases the output voltage until it reaches the set point voltage. At this point, the MOSFET switch turns off, halting the current flow. The pulse width modulation also serves to reduce the output voltage ripple. With the output voltage set, the internal oscillator shuts off, operating the MAX8883EUTA5+T in a low power-consumption mode.

The device can also be used in reverse-battery or over-current protection. The reverse-battery protection prevents damage to ICs due to incorrect installation of batteries. In addition, the over-current protection prevents the device from being damaged due to shorting or overloading the output. The MAX8883EUTA5+T is available in the 6-pin Thin SOT-23-6L package.

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