MAX1658ESA

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PMIC - Voltage Regulators - Linear

The MAX1658ESA is a general purpose voltage regulator that is well-suited to a wide variety of applications. It is a low-dropout (LDO) linear regulator that offers excellent accuracy, fast load and line transient response, and very low dropout voltage.

The MAX1658ESA has on-chip voltage regulation and load regulation as well as over-temperature protection. It is designed to drive large currents, up to 2A, and provide output voltages from 2.1V to 18V. With its integrated thermal shutdown feature, the MAX1658ESA prevents short-term and long-term over-temperature stress to the system.

Applications

• General-purpose voltage regulator
• Post-regulator for DC-DC converters
• Application-specific power supplies
• Battery-powered systems
• Remote sensing
• Portable equipment
• Graphic processor voltage supplies

The MAX1658ESA is used in a variety of applications, including computer motherboards, graphics cards, notebook computers, cellular phones, gaming equipment, PDAs, and other applications that require a reliable low-dropout voltage regulator.

Working principle

The MAX1658ESA works by using a linear circuit with a series of resistors and capacitors to convert the incoming voltage from the power supply (input voltage) to a regulated output voltage. The input voltage is applied to the input of the regulator, and the regulator adjusts its output voltage to maintain a constant output voltage, regardless of the changing input voltage. The MAX1658ESA employs an on-chip voltage reference, which can be preset to regulate the output voltage in the range of 2.1V to 18V. This voltage reference, along with the resistors and other components, a form a voltage divider circuit that determines the output voltage.

The input voltage is applied to the input of the regulator, where it passes through an internal resistor. This resistor divides the input voltage, and the resulting voltage is applied to the gate of an internal FET transistor. The gate controls the amount of current flowing through the FET and, in turn, regulates the output voltage. When the output voltage needs to be increased, the gate voltage increases, which increases the current through the FET and reduces the output voltage. On the other hand, when the output voltage needs to be reduced, the gate voltage decreases, which decreases the current through the FET and increases the output voltage.

The MAX1658ESA also includes other features for improved performance, such as an internal current limit, reverse-bias protection, and thermal shutdown. The internal current limit prevents the regulator output from exceeding a preset current, while both the reverse-bias protection and the thermal shutdown protect the regulator from damage under extreme operating conditions. In addition, the MAX1658ESA can be configured for low-current or high-current operation and can be used as either a low-dropout or fast-responding regulator.

The MAX1658ESA is well suited for a variety of applications, including general-purpose voltage regulation, post-regulator for DC-DC converters, application-specific power supplies, battery-powered systems, remote sensing, portable equipment and graphic processor voltage supplies.

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