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LP2985AIM5X-4.0/NOPB Application Field and Working Principle

The LP2985AIM5X-4.0/NOPB is a low-dropout (LDO) linear voltage regulator designed to provide ultra-low output voltage precision and high output current in the most challenging battery-powered applications. It is an ideal choice for power management systems with heightened requirements for power efficiency, wide voltage range and very low supply current.

The low-ripple power solution consists of integrated regulator circuitry and feedback loop. The input voltage range is from 2.7V to 5.5V, with an output voltage accuracy as small as ±0.6%. With a quiescent current as low as 120nA, this device can help extend battery life in wearable and other battery-powered applications.

Features for LP2985AIM5X-4.0/NOPB

• Very low output voltage: 2.4V to 4.0V ±0.6% accuracy

• Wide input voltage range: 2.7V to 5.5V

• ±2% line regulation over the full temperature range

• Low quiescent current: typically 120nA

• Low dropout voltage: typically 375mV at full load

• High peak output current capability: typically 0.75A

• Thermal overload protection

• Short circuit protection

Applications for LP2985AIM5X-4.0/NOPB

• Wearables
• Medical electronics
• Automotive systems
• Battery-operated systems
• Serial communications

Working Principle

The LP2985AIM5X-4.0/NOPB is a linear voltage regulator designed to provide very low output voltage precision and high output current in the most challenging battery-powered applications. It consists of two main components, an error amplifier and a pass element. The error amplifier is a negative error amplifier (negamp) which senses the voltage difference between a feedback voltage and the output voltage. The error amplifier adjusts the output voltage by varying the gate voltage of the pass element.

The pass element of the regulator is an NMOS transistor which is used to regulate the output. When the gate voltage of the transistor is increased, more electrons will flow from the source terminal to the drain terminal, increasing the current gain and thus the voltage drop across the transistor. When the gate voltage is decreased, fewer electrons will flow, reducing the current gain and thus the voltage drop of the transistor. The gate voltage is adjusted by the error amplifier to regulate the output voltage.

LP2985AIM5X-4.0/NOPB also provides thermal overload protection and short circuit protection. The thermal overload protection prevents excessive power dissipation and will shut down the regulator if the junction temperature reaches a certain temperature threshold. The short circuit protection prevents the load current from exceeding the maximum limit of the regulator.

Conclusion

The LP2985AIM5X-4.0/NOPB is an excellent choice for low dropout linear voltage regulator for applications require low output voltage accuracy and high current output capability. It is ideal for battery-operated applications such as wearables, medical electronics, automotive systems, and serial communications. The integrated circuit provides very low quiescent current and thermal overload protection, making it an ideal choice for high power and long-term stable operation.

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