Step-up DC/DC Converter —Backlight Driver LN5121 ■ General Description The LN5121 Series 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 15V can be derived, and from a 2.
5V input three white Led’s cab 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 2Ω is used.
Allow profile and small board are solutions can be achieved by using a chip coil and an ultra small ceramic output capacitor (CL) of 0.
22uF.
■ Features  Input volta...

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