MAX857ESA+

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MAX857ESA+ is a DC-DC switching regulator that is specifically built for portable computing applications. The device can be used to step up or down an input voltage, allowing the user to create a regulated output voltage with minimal efficiency losses. The device features a number of features that allow it to be used in a wide range of applications, such as providing an adjustable output voltage range and providing protection against short-circuit, overload, and overvoltages. Additionally, the device supports pulse frequency modulation and is designed to be capable of operating over a temperature range of -40 to +85°C.

Features

• Maximum output load current of 1 Amp
• Input voltage range from 2.7 to 5.5V
• Voltage controlled oscillator (VCO) operation from 300KHz-1.4MHz
• Short circuit protection and over temperature protection
• Low quiescent current
• Integrated voltage reference with 10mV error tolerance
• Voltage non-tracking shutdown

Application Fields

The MAX857ESA+ can be used in a wide range of applications, including portable computing and industrial applications. The device can be used in portable computers such as laptops and tablets, where it can be used to step down the higher voltage used in the motherboard of the device. Additionally, it can be used to provide power conversion between the battery and the main integrated circuits. In industrial applications, the device can be used to provide a regulated output voltage or as part of a power supply system.

Working Principle

The MAX857ESA+ utilizes a Pulse Frequency Modulation (PFM) architecture to achieve high efficiency in power conversion. The PFM architecture allows for the device to operate at a fixed frequency, while modulating the duty cycle of the switching pulses to adjust the output voltage. The device is capable of regulating the output voltage over the specified input voltage range. The device utilizes a voltage controlled oscillator to regulate the operating frequency of the device, which can be adjusted between 300KHz and 1.4MHz for improved efficiency.

The device uses two external MOSFETs to generate the switching waveform. The power stage switches between the input voltage and the output voltage, which is regulated by the Pulse Width Modulator (PWM) control block. The MAX857ESA+ incorporates an integrated voltage reference, allowing the device to accurately regulate the output voltage to the exact specified output voltage. Additionally, the device features protection against short-circuit and over-temperature conditions.

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