2009. 2. 25 1/7Revision No : 3
SEMICONDUCTOR
TECHNICAL DATA
KAC3304DU
Analog CMOS Integrated Circuits
1X/1. 5X Fractional Charge Pump for
White LED Driver with 32step Dimming Control.
The KAC3304DU is low noise constant frequency charge pump DC/DC
converter specially designed to drive up to four white LEDs on 32step
dimming control. Dual (1x/1.5x) Modes and low dropout voltage of LED
driver maximize efficiency for the white LED application over full Li-ion
battery input range. Various kinds of protection circuits protect your system
from every undesirable output condition.
Features
1x/1.5x dual charge pump modes with auto detection.
Excellent Power Efficiency. (more than 92% of P
MAX
)
LED current matching of 2%.(Typ.)
Power-down current below 1 A.(max.)
Drives up to 4 LED’s on 32step dimming control.
Up to 22mA/LED current capability. [V
IN
> 3.1V]
Up to 15mA/LED current capability. [V
IN
> 2.7V]
Strong to ESD. [MM:>200V, HBM:>2000V]
Low input ripple and EMI.
Fast serial dimming control.
2.7V to 5.5V input voltage range.
Output over-voltage protection.
Thermal shutdown protection.
Output over-current protection.
Soft start limits Inrush current.
Automatic soft-start protects IC from output short.
1MHz switching frequency.
Small UDFN-12A Package [3 3
mm
2
, t=0.5mm]
Applications
Cellular phones, Smart Phones, PDA, Digital Cameras, Camcorders.
MP3 player and other handheld devices with color displays
