LP2985AIM5-4.0

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LP2985AIM5-4.0 is a series of low dropout (LDO) linear voltage regulators that provide solutions for applications with high power or fast transient response requirements. It is designed for a variety of voltage output applications with features including stability control, power save mode, reverse-battery protection, output current protection, and low quiescent current. The LP2985AIM5-4.0 is a low-dropout voltage regulator optimized for use in space constrained applications and boosts efficiency while maintaining an extremely low quiescent current (5 μA at no load). Its high-accuracy fixed 3.3V output voltage and 0.1μA shutdown current make it ideal for systems with a broad range of supply voltages and low power requirements.

Application Field

The LP2985AIM5-4.0 is an ideal solution for a variety of applications requiring precision and low power such as:

• Audio and Video equipment
• Wireless and Handsets
• Battery-powered portable instruments
• LCD displays
• Point of Sales (POS) Terminals
• Networking Equipment

Its broad input voltage range (1.4V - 6.0V) and enhanced output accuracy (1% at 3.3V) enable it to effectively serve as a system level voltage regulator that can handle a wide variety of supply voltage scenarios. Furthermore, its short-circuit current-limit protection limits the stress on the system in the case of a short-circuit, reducing output ripple and extending the system\'s life.

Working Principle

The LP2985AIM5-4.0 series of voltage regulators are based on a linear-regulating topology and stand out from other linear regulators with their low quiescent current, wide input voltage range, low-dropout voltage, and high-accuracy output voltage.

The working principle of the LP2985 regulator is based on a feedback control loop. An error signal is generated after comparing the desired output (V*) versus the feedback signal (Vz). This signal is amplified and processed by the internal circuitry, and the result is applied to a series pass regulator. The series pass regulator consists of a P-channel MOSFET and a current source. This current source is constantly adjusted in order to maintain the desired voltage on the output node.

The series pass MOSFET is biased by the current provided by the current source, and the power consumption of the regulator is the sum of the current flowing through the current source. The voltage drop at the MOSFET causes the output voltage to drop, so the current must be adjusted by the current source to maintain the desired output voltage. The current source is dynamically adjusted depending on the output load in order to maintain the output voltage even with large capacitive loads.

The feedback voltage is generated through a voltage divider connected to the output node. This feedback signal is compared to the output reference voltage. In the case of an over-voltage scenario, the difference between the two is amplified and the current source is adjusted to reduce the output voltage.

The LP2985AIM5-4.0 series also offers protection against reverse current, over-current, and overheating due to its integrated thermal foldback feature. The thermal foldback feature will reduce the output current once the junction temperature exceeds approximately 150°C.

In conclusion, the LP2985AIM5-4.0 series is a low-power, low-dropout, high-accuracy series of linear voltage regulators suitable for precision applications with small system size and extended life. Its low-dropout voltage and low quiescent current make it an ideal choice for battery-powered applications. Its wide input range and enhanced output accuracy make it a perfect choice for systems with a broad range of supply voltages and low power requirements.

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