A8168

AiT Semiconductor Inc. www.ait-ic.com A8168 SERIES WHITE LED BACKLIGHT DRIVER 1MHz PWM STEP-UP DC-DC CONVERTER DESCRIPTION FEATURES The A8168 Series is a fixed frequency, constant current step-up DC/DC converter idea for driving LEDs used in backlighting application on cellular phones, PDAs and digital cameras etc. Output voltage of up to 17.5V can be derived, and from a 3.2V input four white LED’s can be driven in series or alternatively, using a 2.5V input, a network of two parallel legs with three in each may be driven. Luminance of the LED’s is controlled by changing the duty cycle of a PWM signal applied to the CE pin.          Oscillation frequency : 1.0 MHZ Output voltage range ; up to 17.5V externally set-up reference voltage 0.2V On resistance : 2.0Ω Efficiency : 88%(When driving 3 white LEDs in series Vin=3.6V ILED=20mA) Control : PWM control Stand-by Current : ISTB=1.0μA(MAX) Load capacitor : 0.22μF, ceramic Lx Limit Current : 300mA Available in SOT-26 package In addition, an internal MOSFET with an RDS(ON) of 2Ω is used. Allow profile and small board area solution can be achieved using a chip coil and an ultra small ceramic output capacitor (CL) of 0.22uF. The A8168 is available in SOT-26 Package. APPLICATIONS  For White LED Drivers  Mobil phones, PHS  PDAs  Digital still cameras ORDERING INFORMATION TYPICAL APPLICATION Package Type Part Number SOT-26 A8168E6R-XXX E6 A8168e6vr-xxx Note XXX: FeedBack Voltage 020~149=0.2V~1.49V 0.20~0.49...