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ADD5205:  Four-String White LED Driver

Product Details

Product Status:Recommended for New Designs

The ADD5205 is a white LED driver for backlight applications based on high efficiency, current mode, step-up converter technology. It is designed with a 0.3 Ω internal switch and 1 MHz fixed operating frequency. The ADD5205 contains four regulated constant current sources for uniform brightness intensity. Each current source is capable of driving up to 25 mA.

The ADD5205 has four parallel strings of multiple series connected LEDs with ±2% current matching. The device provides adjustable current sources that drive up to 25 mA using an external resistor. The LED current can be controlled by a PWM signal input on the PWM pin. An internal circuit translates the PWM signal to an analog signal with an external capacitor and linearly controls the LED current.

The ADD5205 has multiple safety protection features to prevent any damage during fault conditions. If one or more LEDs are open, the device disables the faulty current regulator automatically. The internal soft start prevents inrush current during startup. A thermal shutdown protection feature prevents thermal damage.

The ADD5205 is available in a low profile, thermally enhanced 3 mm × 3 mm × 0.75 mm, 12-lead lead frame chip scale package (LFCSP) and is specified over the temperature range of −25°C to +85°C.

APPLICATIONS

  • Smart PCs, PMPs, tablet PCs, UMPCs, and notebooks

FEATURES and BENEFITS

  • White LED driver based on inductive boost converter
    - Input voltage range:
    2.8 V to 18 V
    - Internal compensation
    - 1 MHz fixed operating frequency
    - 28 V fixed overvoltage protection
    - Built-in soft start for boost converter
  • Drives up to 4 LED current sources
    - LED current adjustable up to 25 mA for each channel
    - DC current level brightness control with PWM input
    - LED open fault protection
  • General
    - Thermal shutdown
    - Undervoltage lockout
    - 12-lead, 3 mm × 3 mm × 0.75 mm LFCSP package

Functional Block Diagram for ADD5205

Documentation

Title Content Type File Type
ADD5205: Four-String White LED Driver  (Rev 0, 10/2011) (pdf, 434 kB) Data Sheets PDF
Glossary of EE Terms Glossary HTML

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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