MAX666CSA

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The MAX666CSA is a high-performance linear voltage regulator specifically designed for portable applications. It is an ideal choice for battery-operated systems, providing ultra-low power dissipation, excellent line and load regulation, and fast transient response.

The MAX666CSA is a versatile regulator that supports a wide range of output voltages, from as low as 1.2V to as high as 7.5V. It is available in tiny SOT-23 and SOT-23-5 packages, and offers enhanced system reliability due to its overtemperature and overcurrent protection. These features, combined with its low power dissipation, make the MAX666CSA a perfect choice for portable, cost-sensitive applications.

Application Field

The MAX666CSA is suitable for many portable applications, such as PDAs, cellular phones, and digital cameras. With its built-in protection features, the device is especially well-suited for applications that require enhanced system reliability. It is also ideal for space-constrained and battery-operated systems, due to its low quiescent current, shutdown current and low power dissipation.

Working Principle

The MAX666CSA is a linear voltage regulator that uses a PNP pass transistor to regulate the output voltage. The device is designed to operate with low input voltages, ranging from 2.5 V to 6.25 V. The internal PNP transistor is biased by an internal bandgap reference, which provides accurate output voltage regulation, with high line and load regulation.

The output voltage of the MAX666CSA is set by an external resistor divider network. When the output voltage drops, the internal PNP transistor activates to maintain a constant output. The device also features overload and short-circuit protection to protect the device from damage due to high output voltage and short-circuits.

The MAX666CSA features a low-power shutdown mode, which can reduce the supply current to less than 0.1 µA. This makes the device ideal for battery-operated applications, where power efficiency is paramount. The shutdown mode can be enabled/disabled through an open-drain, active-low enable pin.

Aside from its low power dissipation and shutdown current, the MAX666CSA also features excellent output accuracy and very fast transient response. It also offers enhanced protection in the form of overtemperature and overcurrent protection. All of these features, combined with its wide range of output voltages, make the MAX666CSA an ideal choice for portable, cost-sensitive applications.

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