DESCRIPTION
The LTC3220/LTC3220-1 are highly integrated multi-display LED drivers. These parts contain a high efficiency, low noise charge pump to provide power to up to eighteen universal LED current sources. The LTC3220/LTC3220-1 require only fi ve small ceramic capacitors to form a complete LED power supply and current controller.

FEATURES
■ Eighteen 20mA Universal Current Sources with
   64-Step Linear Brightness Control
■ Independent On/Off, Brightness Level, Blinking and
   Gradation Control for Each Current Source Using
   2-Wire I2C Interface
■ Low Noise Multi-Mode Charge Pump (1x, 1.5x, 2x)
   Provides Up to 91% Effi ciency
■ Slew Limited Switching Reduces Conducted and
   Radiated Noise (EMI)
■ Up to 360mA Total Output Current
■ Internal Current Reference
■ Single Reset Pin for Asynchronous Shutdown and
   Reset of All Data Registers
■ Two I2C Addresses Are Available (LTC3220: 0011100,
   LTC3220-1: 0011101)
■ Automatic or Forced Mode Switching
■ Internal Soft-Start Limits Inrush Current
■ Short-Circuit/Thermal Protection
■ 4mm × 4mm Ultrathin (0.55mm) 28-Lead QFN
   Package

APPLICATIONS
■ Video Phones with QVGA+ Displays
■ Keypad Lighting
■ General/Miscellaneous Lighting