ACE714B

ACE714B Step-up DC/DC Converter Backlight Driver Description The ACE714B is a fixed frequency, constant current step-up DC/DC converter ideal for driving LEDs used in backlighting applications on cellular phones, PDAs and digital cameras etc. Output voltage of up to 28V can be derived, and from a 2.5V input three white LED’s can be driven in series. Luminance of the LED’s is controlled by changing the duty cycle of a PWM signal applied to the CE pin. In addition, an internal MOSFET with an Rds-on of 0.3Ω is used. Allow profile and small board area solution can be achieved using a chip coil and an ultra small ceramic output capacitor. Features  Input voltage range : 2.5V-5.5V  Output voltage range : up to 28V  Low 104mV feedback voltage  Oscillation frequency : 1.2MHz  Typical Efficiency : 88%.  Control : PWM control.  Stand-by Current : <1μA  High Supply Capability: Deliver 10V 300mA from 3.5V supply  Lx limit Current : 1.3A Application  For White...