MAX8840ELT21+T

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System power management is an essential part of any electronics design. The MAX8840ELT21+T is a low power, cost effective power management IC (PMIC) that provides many of the features and functions required for efficient and reliable power management.MAX8840ELT21+T is a two-input linear regulator, which includes two integrated linear regulators (LDOs) and one switching regulator (Buck). The linear regulators support up to 1.2A and 1.5A output current respectively, while the Buck regulator supports up to 2.5A output current. The device provides programmable power-good outputs for both regulators, overcurrent protection for the Buck and LDO outputs, thermal compensation for the linear regulator, output voltage tracking, and power-down sequencing. It also features a low-standby current (<1uA).

Application Field

The MAX8840ELT21+T is ideal for applications such as notebooks, tablets and other portable devices that require a small form factor, high efficiency and comprehensive power sequencing capabilities. It is also suitable for high end and mid-range phones and applications that need fast transient response and low noise performance. Furthermore, it is a cost effective solution for more general consumer and consumer electronic device applications that need multiple linear and switching regulators.

Working Principle

The MAX8840ELT21+T consists of two separate linear regulators and one switching regulator, each configured independently. The linear regulators are based on band-gap voltage reference and have low-dropout (LDO) topology. The switching regulator is based on a step-down controller with phase-shift full-bridge topology. The linear regulators have 20mV of typical dropout voltage, whereas the switching regulator has a typical dropout voltage of 140mV.

The linear regulators have independent enable pins, allowing for both to be enabled or disabled individually for flexibility. They also support adjustable output voltages, allowing for easy adaptation to different power requirements. The output voltages of both linear regulators can be programmed with external resistors.

The MAX8840ELT21+T includes two independent power-good (PG) pins, one for each regulator. These PG pins detect when the output in the device is at the programmed voltage and are used to signal the system controller that the regulator is operating within its limits.

The switching regulator in the MAX8840ELT21+T supports a wide range of input and output voltages, making it suitable for a variety of applications. It provides up to 2.5A of output current and offers adjustable frequency and adjustable output voltages for flexibility. It also features both skip and pulse skipping modes for improved efficiency and low noise operation.

The MAX8840ELT21+T features overcurrent protection (OCP) for both linear and switching regulators, helping to protect the system from damage due to excessive currents. It also features thermal compensation for the linear regulators, allowing for better temperature drift and improved performance in hot environments. Lastly, the device has a low-standby current of <1uA for improved efficiency.

In summary, the MAX8840ELT21+T is a low power, cost-effective PMIC that provides many of the features and functions required for efficient and reliable power management in a range of applications. It includes two integrated linear regulators and one switching regulator, and supports up to 1.2A and 1.5A output current respectively. It also includes overcurrent protection, voltage tracking, power-good outputs, and low-standby current.

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