EUP3651
4-Channel, 1X/1.5X Charge Pump
White LED Driver
DESCRIPTION
The EUP3651 is a high efficiency charge pump white
LED driver. It supports 4 white LEDs with regulated
constant current for uniform intensity. The EUP3651
maintains the highest efficiency by utilizing a 1.5X
fractional charge pump and low dropout current
regulators. A low external parts count (two 1uF flying
capacitors and two small 1uF capacitors at V
IN
and
V
OUT
) makes the EUP3651 ideally suited for small
battery-powered applications.
The EN logic input is used to enable, disable, and set
current with a 16-step linear scale.The LED current can
be configured between 5mA and 25mA. If EN is kept
low for more than 1.5ms, the EUP3651 enters shutdown
mode.
The EUP3651 is available in a 12-pin 3mm x 3mm
TDFN package.
FEATURES
1X/1.5X Mode for Ultra-High Efficiency
Up to 25mA Output Current for Each Channel
2.7V to 5.5V Input Voltage
1MHz Fixed Switching Frequency
Single-Wire Serial Pulse Interface to Set LED
Current with 16-step Linear scale
Soft Start Function
Built-In Short-Circuit Protection
Built-in Thermal Protection
I
Q
<1uA in Shutdown
TDFN-12 Package
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
Mobile phone
Small LCD Backlighting
Programmable Current Sinks
White Photo Flash for Digital Cameras
Typical Application Circuit
Figure 1.
DS3651
Ver1.0
Feb. 2008
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
