GENERAL DESCRIPTION
The IS31BL3228A (IS31BL3228B) is a low noise, constant frequency charge pump DC/DC converter for white LED applications. The IS31BL3228A (IS31BL3228B) is capable of driving up to four (six) channels of LEDs at preset 20mA per channel from a 2.8V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher current LEDs. Only one 1μF small capacitor (at C+ thru C-) and two small 2.2μF capacitors (at VCC and VOUT) are needed, it makes this part ideally suited for small, battery-powered applications.

FEATURES
● VCC range: 2.8V to 5.5V
● Fully programmable current with single wire
● 14 current levels
● Drives up to four (IS31BL3228A)/six
   (IS31BL3228B) channels of LEDs
● No inductors, low noise operation
● Built-in thermal protection
● Automatic soft start
● Low shutdown current: ISD <3μA
● UTQFN-12 (2mm × 2mm ) package

APPLICATIONS
● Cell phone, smart phone, PDA
● MP3, MP4, PMP
● White LED backlighting