DESCRIPTION
The LTC®3230 is a low noise charge pump DC/DC converter designed to drive 4 Main LEDs and 1 Sub LED, plus two 200mA linear regulators to provide additional system power. The LTC3230 charge pump requires only four small ceramic capacitors and one current set resistor to form a complete LED power supply and current controller.

FEATURES
■ Low Noise Charge Pump Provides High Effi ciency
   with Automatic Mode Switching
■ Multimode Operation: 1x, 1.5x, 2x
■ Full-Scale Current Set Resistor
■ Up to 125mA Total LED Current
■ Single Wire Enable/Brightness Control for Main and
   Sub Display LEDs
■ 32:1 Linear LED Brightness Control
■ Dual 200mA Linear Regulators
■ Four 25mA Low Dropout Main LED Current Sources
■ One 25mA Low Dropout Sub LED Current Source
■ Low Noise Constant Frequency Operation
■ Low Shutdown Current: 3μA
■ Internal Soft-Start Limits Inrush Current During
   Start-Up and Mode Switching
■ Open/Short LED Protection
■ No Inductors
■ 20-Lead 3mm × 3mm QFN Package

APPLICATIONS
■ Multi-LED Driver and Dual LDO Supplies for Cell
   Phone, PDA, Digital Camera and PND Applications