MAX5021EUA+

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Introduction to MAX5021EUA+ Voltage Regulators
The MAX5021EUA+ is a low-cost, easy-to-use monolithic switching controller designed to drive half-bridge, step-down DC-DC regulators with tiny external components. The MAX5021EUA+ features a wide 4.6V to 27V input voltage range and includes high/low-side drivers, RDS(ON)sense, a programmable current limit system, and a soft-start circuit. It also offers external synchronization, skip-cycle control for light load efficiencies, forced continous conduction mode for high load torques and low ripple current, and adjustable dead time, which allows for easy optimization for output filter size.
The MAX5021EUA+ is suitable for driving all types of step down, pulse-width modulated (PWM) DC-DC converters in a variety of applications, including industrial systems, regulated power supplies, portable and handheld equipment, laptop/tablet computers, portable instrumentation, and battery chargers.
Application Field of MAX5021EUA+ Voltage Regulators
The MAX5021EUA+ voltage regulator is ideal for low-cost DC-DC applications such as USB PD, wireless charging and solar energy harvesting, as well as other power supply designs requiring high efficiencies, small footprints, and wide input operating range, and medical device designs which demands higher reliability from the power management system.
In addition the MAX5021EUA+ switching controllers are used in a variety of specific applications such as:
    
High-efficiency DC-DC step-down, LED drivers.
    
Drone and mobile phones.
    
Power over Ethernet (PoE) systems.
    
Multi-rail power supplies and other isolated power supply applications.
    
Automotive electronics.
    
Alternative energy systems.
Working Principle of MAX5021EUA+ Voltage Regulators
The MAX5021EUA+ is a current-mode PWM controller that operates with a fixed frequency of 200 kHz, adjustable for up to 350 kHz, and is intended for use in step-down DC-DC converters. The device includes an integrated high- and low-side power MOSFET driver capable of sourcing and sinking a current up to 100mA. It also includes an internal start-up circuit and a soft-start circuit.
The device is designed to operate with a regulated internal oscillator that sets the switching frequency of the converter, with a typical 200-kHz switching frequency, which is adjustable up 350-kHz using an external resistor. Half-bridge converters using the MAX5021EUA+ are driven with a 180° phase difference between the high- and low-side power MOSFETs while two switches are positive and negative high-side and low-side power MOSFETs, respectively.
The MAX5021EUA+ also incorporates a voltage sense amplifier so current can be sensed within the power MOSFET gates, a peak current limit system, cycle-skipping for light loads and forced continous conduction mode for heavy loads. This controller also includes an adjustable dead time setting feature which enables users to optimize their circuit for various load and output filter designs.
Conclusion
The MAX5021EUA+ is a low-cost, easy-to-use monolithic switching controller designed to drive step-down DC-DC regulators with tiny external components. The MAX5021EUA+ features a wide 4.6V to 27V input voltage range and includes high/low-side drivers, RDS(ON)sense, a programmable current limit system, and a soft-start circuit. It also offers external synchronization, skip-cycle control for light load efficiencies, forced continous conduction mode for high load torques and low ripple current, and adjustable dead time, which allows for easy optimization for output filter size.
 
The MAX5021EUA+ voltage regulator is suitable for use in many low-cost DC-DC applications such as USB PD, wireless charging and solar energy harvesting, as well as other power supply designs. It is also ideal for use in many specific application fields such as high-efficiency DC-DC step-down, LED drivers, drone and mobile phones, Power over Ethernet (PoE) systems, multi-rail power supplies, automotive electronics and alternative energy systems.
The MAX5021EUA+ is driven with a 180° phase difference between the high- and low-side power MOSFETs, and includes a regulated internal oscillator that sets the switching frequency, an adjustable dead time, a voltage sense amplifier, a peak current limit system, cycle-skipping and forced continous conduction mode.
In conclusion the MAX5021EUA+ is an excellent solution for a variety of low-cost DC-DC applications, offering high performance and efficiency, wide operating range, minimal external component count and adjustable feature set. 

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