LT1579CS8-3#PBF

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The LT1579CS8-3#PBF is a low-voltage CMOS charge pump controller from Linear Technology, which operates from a supply voltage of +1.5V to +5.5V. It was specifically designed to drive LEDs at current up to 200mA with a boost up to 6V. It also includes a power-save mode that returns the load current to 1mA when it is not actively driving an LED. The LT1579CS8-3#PBF is commonly used in PMIC - Battery Management applications, especially in lighting systems and portable electronic equipment.

The LT1579CS8-3#PBF has an internal charge pump constructed with 8 N-channel MOSFETs, supplying up to 200mA of output current at up to 6V of output voltage. It employs a high-efficiency cycle-by-cycle current-limiting architecture to protect against excessive output current and short-circuits. The device also features a power save mode that disables the output for reduced current consumption. This device is optimized for driving multi-string of LEDs in series or in parallel, offering independent current limit and current steering for each string.

The LT1579CS8-3#PBF also includes a wide range of protection features. It has an input supply under-voltage lockout (UVLO) to ensure that the LEDs are protected against any sudden supply voltage dip. It also has an output under-voltage lockout circuit to regulate the LED brightness in dim applications. Over-temperature protection reduces the power dissipation and ensures that the device stays within its safe operating area.

This device also features a constant current control (CCC) pin that is used to regulate the output current of the device independently of the input voltage. This helps to maintain a stable output current regardless of the input supply voltage, allowing for more consistent LED brightness over varying supply voltage conditions. The device also features soft start circuitry, enabling the user to control the current rise rate, thus reducing stress on the LEDs at power up.

The LT1579CS8-3#PBF is the ideal choice for high efficiency, low-profile battery-powered lighting control and mobile device applications. Its ultra-low current consumption, wide input range and high-efficiency boost operation make it perfect for powering multi-string LED backlighting arrangements. The device’s optimized current control enables it to offer high performance and reliable operation while still meeting stringent cost and size constraints.

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