LP3133 Datasheet, PDF (1/5 Pages) Lowpower Semiconductor inc – PWM tuned LED brightness through PWM pin(200Hz-10KHz)

Preliminary Datasheet
LP3133
4-Channel Current Source White LED Driver
General Description
The LP3133 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 LP3133 maintains low dropout
current regulators. The LP3133 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 LP3133 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(200Hz-10KHz)
— Soft Start Function
— Built-in Thermal Protection
— IQ<1uA in Shutdown
— QFN-16 Package
— RoHS Compliant and 100% Lead (Pb)-Free
Typical Application Circuit
Order Information
LP3133 - □ □ □
F: Pb-Free
Package Type
QV: QFN-16
VBATT
13 _{VIN LP3133 VOUT} 8
PWM
15
16
EN
EN
1
2
9
10
NC
NC
NC
11
12
NC
NC
NC
1uF
6
LED1
LED2
LED3
LED4
5
4
3
PGND
GND
7
14
Marking Information
Please see website.
Applications
— LCD Panel
— Cellular and Smart mobile phone
— PDA/DSC
— PMP
LP3133 – Ver. 1.0 Datasheet Feb.-2008
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