LT1512CS8#TRPBF

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The LT1512CS8#TRPBF is a micro-power high-efficiency CMOS SWIFT fast-charging system battery charger with input supply current settings optimized for USB-powered applications. It is a variable-frequency, synchronous-diode (auto-PAR), buck-boost switching DC/DC converter with a digitally programmable output current that ranges from 0.5A to 1.5A and a dynamic power limit up to 5W. The LT1512CS8#TRPBF operates from input supply voltages as low as 4.2V, making it suitable for low-voltage USB supplies. The LT1512CS8#TRPBF is optimized for fast-charging rechargeable Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Poly) batteries. The device features an optional high-side MOSFET that significantly reduces system power consumption in idle mode with an input supply current of only 115mV dropout. Its small 8-Pin SC70JW package makes it ideal for portable applications where board space is minimal or enclosure space is limited.

PMIC - Battery Chargers:

The LT1512CS8#TRPBF PMIC battery charger is designed to charge Li-Ion and Li-Polymer batteries with output current ranging from 0.5A to 1.5A. The charger has an adjustable switching frequency up to 1MHz, and an input supply voltage as low as 4.2V. The charging cycle includes fast-charge and constant voltage charge phases. The charger can be configured to operate in low-power idle mode using an optional high-side MOSFET, which reduces the input supply current to only 115mV dropout. The charger is efficient, with an I2C serial bus interface for setting and monitoring the charging parameters. It also has feature protection such as overcurrent, thermal, and battery undervoltage protection.

Working Principle:

The LT1512CS8#TRPBF PMIC battery charger operates by converting the input supply voltage to a regulated DC output. The charge cycle is separated into two main phases: fast-charge and constant voltage charge. During the fast-charge phase, the LT1512CS8#TRPBF regulates the output voltage depending on the battery voltage and the programmed charging current. This helps to maximize the rate of charge while avoiding overcharging or battery damage. Once the charging current has been reduced to a predetermined level, the battery has reached the charge saturation point and enters the constant voltage charge phase. During this phase, the LT1512CS8#TRPBF reduces the charging current further, until it reaches a near-zero value and stays there until the battery is removed.

Application Field:

The LT1512CS8#TRPBF PMIC battery charger is suitable for a wide range of portable applications, including handheld devices, cell phones, MP3 players, PDAs, and USB-powered accessories. Its small 8-Pin SC70JW package makes it an ideal solution for tight space applications and the integrated overcurrent, thermal, and battery undervoltage protection mean it has built-in safety features to guard against unintended system operation. Its low-power consumption and adjustable switching frequency make it an optimal choice for energy conservation. Additionally, the LT1512CS8#TRPBF is simple to use, with I2C serial bus interface allowing configuration and monitoring.

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