LX1994

www.DataSheet4U.com LX1994 TM ® High Efficiency LED Driver P RODUCTION D ATA S HEET DESCRIPTION KEY FEATURES ƒ Efficiency > 92% ƒ Dual PFM Architecture To Extend Battery Life ƒ VIN Range 2.0V To 5.5V. Start Up Warranty @ 2.0V ƒ Logic Control Shutdown ƒ 100µA Typical Quiescent Current ƒ Shutdown IQ Current <1µA ƒ OVP For Open String Output Voltage ƒ Low Voltage And Offset Current Sense ƒ Light Sensor (LX1970) interface ƒ Dual Dimming Options (PWM or DC Voltage) ƒ No External Zener Clamp Diode ƒ 10-Pin MLP or MSOP APPLICATIONS Microsemi’s LX1994 is a compact, high efficiency, step-up boost controller which is designed to drive a string of white or colored LED’s in a backlight or front light system. The LX1994 design is based on a dual mode PFM architecture and provides maximum typical efficiency greater than 92%. The LX1994 has many unique design features and advantages over competitor solutions. The features included: low quiescent current (100µA typical), low shut down current (<1µA), dedicate ambient light sensor interface (LX1970), dual dimming modes, low voltage and low offset current sense, and integrated OVP protection. The converter achieves high efficiency, low cost, and flexible design by selection of an external NChannel MOSFET, current sense resistors, and integrated OVP protection. The use of external N-channel MOSFET allows design to optimize system efficiency. The OVP protection comparator eliminates the need of an external Zener diode clamp. The OVP functi...