Description
   The CAT3649 is a high efficiency fractional charge pump that can drive up to six LEDs. The inclusion of a 1.33x fractional charge pump mode increases the device efficiency by up to 10% over traditional 1.5x charge pumps with no added external capacitors.

FEATUREs
• High Efficiency 1.33x Charge Pump
• Charge Pump: 1x, 1.33x, 1.5x, 2x
• Drives up to 6 LEDs at 25 mA Each
• PWM Dimming 100 Hz to 200 kHz for CABC
• 1−wire EZDim 32 Linear Steps (ADIM)
• Power Efficiency up to 92%
• Low Noise Input Ripple in All Modes
• “Zero” Current Shutdown Mode
• Soft Start and Current Limiting
• Short Circuit Protection
• Thermal Shutdown Protection
• 3 mm x 3 mm, 16−pad TQFN Package
• This Device is Pb−Free, Halogen Free/BFR Free and is RoHS
   Compliant

Typical Applications (Note 1)
• LCD Display Backlight
• Cellular Phones
• Digital Still Cameras
• Handheld Devices
1. Typical application circuit with external components is shown in Figure 1.