LN5121 - natlinear

LN5121 Step-up DC/DC Converter - Backlight Driver

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.

Features

 Input voltage range : 2.5V—6V
 Output voltage range : up to 15V externally set-up reference voltage 0.2V
 Oscillation frequency : 1.0MHZ±20%
 On resistance : 2.0Ω
 Efficiency : 88%(When driving 3 white LEDs in series VIN=3.6V ILED=20mA)
 Control : PWM control
 Stand-by Curren.