LP38691SDX-ADJ

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LP38691SDX-ADJ Application Field and Working Principle

Linear voltage regulators, such as the LP38691SDX-ADJ, are widely used to supply regulated (fixed) voltage to various electronic and electrical devices, often in the form of integrated circuits. The LP38691SDX-ADJ is a digitally adjustable 1A Low Noise, Low Dropout voltage regulator that operates over a wide input voltage range (2.2V to 5.5V). It offers precise adjustable output voltage and variable output current limiting in many common applications.

Application Field of the LP38691SDX-ADJ

The LP38691SDX-ADJ is an optimal solution when a precise, low-noise, wide-range adjustable voltage output (with precise voltage control accuracy over all common output voltage levels), in a small package, is required. This device is especially well suited where pulse-by-pulse current limiting is important and dynamic load changes must be kept to a minimum. Common applications for the LP38691SDX-ADJ Voltage Regulator includes embedded systems, memory and power management, communications, DSPs and instrumentation, industrial control, and consumer appliances.

Working Principle of the LP38691SDX-ADJ

The LP38691SDX-ADJ has an adjustable output voltage that is programmed by external resistors. The input voltage range is 2.2-5.5V and the output voltage range is 0.825-3.375V with an accuracy of ±1%. Its external components are designed to deliver a maximum output current of 1A. The voltage range is adjustable by changing the external resistors or the output voltage can be enabled from 0V to 3.65V with a single external resistor.

The LP38691SDX-ADJ is based on an internal error amplifier which compares the output voltage referred to the adjustment pin to an internal reference. When the output voltage does not match the setpoint, the error amplifier adjusts the gate of the internal P-channel MOSFET so that the output voltage is forced to follow the setpoint. The internal P-channel MOSFET passes current from input to output, so the output voltage is defined by its resistance times the current that it sinks from the adjustment pin.

The LP38691SDX-ADJ features an external enable/disable function to control the power-on status. This feature is controlled by a logic IC on chip which is triggered by an external pin that can be driven by a logic signal. The device automatically reduces the output current to a low leakage current, when the enable signal is taken low. This feature is activated when the power supply drops below a certain minimum.

The LP38691SDX-ADJ also incorporates an output current-limit feature which protects the entire circuit from damage in case of overloads. When an overload occurs the device limits the output current automatically to its maximum safe limit and the device shuts down to protect the rest of the system. The LP38691SDX-ADJ also features under-voltage protection which is activated when the input voltage drops below a certain level.

Conclusion

The LP38691SDX-ADJ provides an optimal solution for applications requiring an adjustable output voltage, precise voltage control accuracy and small package size. Its adjustable voltage range, external enable/disable feature, current-limit protection and under-voltage protection make it an ideal choice for many applications.

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