ZXLD1100H6TA Datasheet

PMIC - LED Drivers


The ZXLD1100H6TA is a PFM inductive boost converter designed for driving 2, 3 or 4 series connected white LEDs from a Li-Ion cell and up to 8 LEDs from a 5V supply. The device operates from an input supply of between 2.5V and 5.5V and provides an adjustable output current of up to 50mA. The ZXLD1100H6TA includes the output switch and peak current sense resistor, and can operate with a maximum output voltage of 28V. Quiescent current is typically 60A and a shutdown function is provided to reduce this current to less than 500nA in the off state. Output current can be adjusted by applying a PWM control signal to the Enable pin. Depending upon the control frequency, this will provide either a continuous or a chopped output current. The PWM filter components are contained within the chip. The ZXLD1100H6TA contains an internal avalanche diode to protect the output switch. This allows the device to operate indefinitely if the load is open circuit. Input supply current during this condition is less than 1mA. The device is assembled in a low profile SC70-6 pin package with industry standard pinout. ZXLD1100H6TA Features • Low profile SC70 6 pin package• Internal PWM filter for flicker free output• High efficiency (80% typ)• Wide input voltage range: 2.5V to 5.5V• Up to 50mA output current• Low quiescent current: (60A typ)• 500nA maximum shutdown current• Up to 1MHz switching frequency• Low external component count• Inherently matched LED currents ZXLD1100H6TA Applications • Mobile phones• Digital cameras• PDAs• LCD modules• Portable internet appliances• Palmtop computers


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