LT1579IGN-3#PBF

PMIC - Battery Management: LT1579IGN-3#PBF Application Field and Working Principle

To meet the increasing demand for better portable electronic device designs, power management integrated circuits (PMIC), must keep pace with the continual rise of energy efficiency expectations.

The LT1579IGN-3#PBF is a single-output high-efficiency Power Management Unit (PMU) from Linear Technology that provides regulated output voltages from 0.8 V to 5.5 V with very high efficiency and small size.

The LT1579IGN-3#PBF is an integrated battery management and charger solution that is ideally suited for high-current, high-voltage point-of-load (POL) applications in laptop and industrial PCs, portable medical systems, and other applications that require flexible and efficient power delivery.

This PMU integrates a high-efficiency, synchronous step-down controller, an adjustable linear regulator, an LED driver and a 4-channel general-purpose analog amplifier with very low noise and low power consumption.

It also includes an integrated USB input voltage monitor and voltage setting resistor, four dedicated high-side sense FETs with power gating, and a digital output (PDN#) for charging, enabling and controlling the PMIC.

The LT1579IGN-3#PBF integrates four main operating modes which are battery charging, battery discharging, battery disconnecting, and voltage tracking.

Battery Charging Mode

The Battery Charging Mode is used for charging the battery pack, and can be implemented with one of two charging topologies. The first topology is a constant-voltage, constant-current (CV/CC) charging profile, which is useful for applications that require faster recharge times. The second topology is a constant-voltage, constant-power (CV/CP) charging profile, which has slower recharge times, but is more efficient.

Battery Discharging Mode

The Battery Discharging Mode is used to power the system directly from the battery. This mode allows the system to be powered off of the battery without requiring any external power. This mode is useful for applications that process sensitive information or require highly efficient operation.

Battery Disconnect Mode

The Battery Disconnect Mode is used to disconnect the battery from the system. This ensures that the battery is isolated from the system when not in use, and prevents any power drain from the battery. This mode is typically used when the system is in a low-power state or is turned off.

Voltage Tracking Mode

The Voltage Tracking Mode is used to ensure the system\'s output voltage is maintained at a constant level. The voltage tracking mode can be used to maintain the battery\'s voltage in either a constant-voltage or constant-power profile. This mode is useful for systems that require a consistent and reliable output voltage.

The LT1579IGN-3#PBF is an ideal solution for applications in which efficient and reliable power delivery is essential. By integrating a high-efficiency synchronous step-down controller, an adjustable linear regulator, an LED driver, and a 4-channel general-purpose analog amplifier, the LT1579IGN-3#PBF offers the ultimate power management solution for power-sensitive applications.

To maximize efficiency and minimize size, the LT1579IGN-3#PBF also incorporates power gating and voltage setting resistors, as well as a digital output for charging, enabling, and controlling the PMIC. In addition, the four operating modes provide flexibility and ensure that the system\'s output voltage is regulated and maintained accurately.

In short, the LT1579IGN-3#PBF is a high-efficiency, high-power, and comprehensive PMU for portable electronics, medical systems, and other high-current, high-voltage applications. With its ability to provide both efficient power delivery and reliable voltage regulation, the LT1579IGN-3#PBF is the ideal solution for battery management and point-of-load applications.