LX8385A-33CP

The LX8385A-33-CP is a low-dropout (LDO) linear voltage regulator designed with a built-in PFM controller and a smart BiCMOS process. This device is designed to provide a regulated output voltage while consuming very low quiescent current. The LX8385A-33-CP is capable of operating with input voltage range of 2.3V to 5.5V and delivers a fixed output voltage of 3.3V ±1%. It is capable of outputting up to 100mA of continuous current.

The LX8385A-33-CP has an ultra-low quiescent current, making it ideal for battery-powered portable systems that need to remain powered for long periods of time. Additionally, the device is extremely efficient, dissipating very low heat. This makes the device suitable for designing into systems that require low power consumption and have space constraints such as small form factors and dense thermal environments.

Applications that can benefit from the features offered by the LX8385A-33-CP include consumer electronics, battery-powered portable devices, or any system that requires low power consumption.

Working Principle

The LX8385A-33-CP uses several components to regulate voltage and maintain a constant output voltage. This includes an LDO regulator, a voltage reference, a PFM control IC, and several passive components.

The voltage reference provides a stable reference voltage of 3.3V. This reference voltage is then compared to the input voltage to provide a control signal for the PFM control IC. This IC is responsible for controlling the duty cycle of the MOSFET switch.

The LDO regulator is responsible for regulating the output voltage to 3.3V ±1%. It is a low dropout regulator, meaning that the input voltage can be slightly lower than the output voltage (3.3V) and the regulator will still operate. The LDO regulator is composed of an error amplifier, a comparator, a current source, and an output switch (MOSFET). The error amplifier compares the output voltage to the reference voltage and adjusts the current source accordingly. The output switch is then turned on and off to regulate the output voltage.

The LX8385A-33-CP is capable of operating in both PWM and PFM modes. In PWM mode, the MOSFET switch is fully turned on and off, thereby providing a constant output voltage. In PFM mode, the MOSFET switch is partially turned on and off in order to maintain a constant output voltage. This mode is more efficient since less current is consumed and less heat is generated.