ZXLD1101ET5TA Datasheet PDF - Zetex

●DESCRIPTION

●The ZXLD1101 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 ZXLD1101 includes the output switch and peak current sense resistor, and can operate with a maximum output voltage of 28V.

●Quiescent current is typically 60μA 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 device is assembled in the TSOT23-5 pin package with 1mm maximum height profile.

●ADVANCED FEATURES

●• True Analog Dimming via PWM

●FEATURES

●• 1mm height profile TSOT23-5 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: (60μA typ)

●• 500nA maximum shutdown current

●• Up to 1MHz switching frequency

●• Low external component count

●• Inherently matched LED currents

●APPLICATIONS

●• Mobile phones

●• Digital cameras

●• PDAs

●• LCD modules

●• Portable internet appliances

●• Palmtop computers