Preliminary Datasheet
LP3164
4-Channel Current Source White LED Driver
General Description
The LP3164 is a low-dropout bias supply for white LEDs is
a high-performance alternative to the simple ballast
resistors used in conventional white LED designs. It
supports 4 white LEDs with regulated constant current for
uniform intensity. The LP3164 maintains low dropout
current regulators. The LP3164 requires a 50mV dropout
at a 20mA load on each output to match the LED brightness.
The brightness of LEDs can be tuned through a pulse width
modulated signal at the PWM pin.
The LP3164 is available in a QFN-16 package.
Features
2.7V to 6V Input Voltage
20mA maxim sink current
PWM tuned LED brightness through PWM
pin(2KHz)
Soft Start Function
Built-in Thermal Protection
I
Q
<1uA in Shutdown
QFN-16 Package
RoHS Compliant and 100% Lead (Pb)-Free
Typical Application Circuit
VBATT
PWM
8
1
2
3
4
9
14
15
16
EN
NC
NC
NC
NC
NC
NC
NC
NC
VIN
7
1uF
LED1
LED2
LED3
LED4
PGND
GND
13
12
11
10
6
5
LP3164
Order Information
LP3164 -
□ □ □
F: Pb-Free
Package Type
QV: QFN-16
Marking Information
Please see website.
Applications
LCD Panel
Cellular and Smart mobile phone
PDA/DSC
PMP
LP3164 – Ver. 1.0 Datasheet
Feb.-2008
Page 1 of 5
POWER [ LOWPOWER SEMICONDUCTOR INC ]
