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LN5121 - Step-up DC/DC Converter - Backlight Driver

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.

Key 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.

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Datasheet Details

Part number LN5121
Manufacturer natlinear
File Size 235.68 KB
Description Step-up DC/DC Converter - Backlight Driver
Datasheet download datasheet LN5121 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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 voltage range : 2.5V—6V  Output voltage range : up to 15V externally set-up reference voltage 0.