LP3856ESX-1.8

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LP3856ESX-1.8 application field and working principle

LP3856ESX-1.8 belongs to the class of PMICs (Power Management Integrated Circuits) known as Voltage Regulators - Linear, and is commonly used in automotive applications and critical industries such as medical, industrial and military. It is also used for portable electronic devices including netbooks, notebooks, tablets, and phones. The LP3856ESX-1.8 also known as “ESX series” is a pre-programmable voltage regulator (Vreg) specifically designed for automotive, high-end industrial, and military applications, where control, flexibility and reliability are paramount.

This non-synchronous buck desktop Vreg with switchable enable and power good feature offers a wide input voltage range from 4.5V to 17V and low-output voltage range from 0.6V to 5V. It utilizes a power MOSFET switching technology that regulates the output voltage with an accuracy of ±0.5% (1%). The operating temperature range is -40°C to +150°C.

The main functional blocks of the LP3856ESX-1.8 are the GNDA (ground dynamic attenuators), the precise internal reference, the error amplifiers, the external MOSFETs, the gate drive control, the soft-start circuits, the thermal control, the EN control, the PGOOD control, and the internal over-current protection circuitry. Each functional block provides the required key characteristics.

The GNDA is a precision device that ensures that a constant ground dynamic reduction is generated to reduce power supply induced artifacts. The precise internal references convert a fraction of the output voltage as an internal reference voltage and provide voltage regulation accuracy and excellent line/load regulation. The error amplifiers form a closed-loop feedback configuration in order to maintain constant output voltage at any load. The external MOSFETs together with the gate drive control block form the main switching regulator path. The soft-start circuits ensure the smooth start of the buck regulator.

The thermal control forms a hysteresis-based temperature sensitive circuit which limits the operating temperature. The EN control is responsible for enabling or disabling the regulator. The PGOOD control block monitors the output voltage conditions and informs the external world about the regulation state. The over-current protection circuitry provides protection against output over-current conditions.

The LP3856ESX-1.8 is a highly reliable and superior voltage regulator ideal for automotive and other high-end industrial and military applications demanding lower output noise, higher efficiency, and higher reliability. Its wide input voltage range and low-output voltage range make it suitable for a wide range of applications.

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