PT4103 Datasheet

时间: 2009-06-26 来源: Seawin 浏览量:

文件类型：

文件大小：下载次数:

PT4103 Datasheet 文件类型: *

[ 本地下载 ]

   White LED Step-Up Converter
GENERAL DESCRIPTION
The PT4103 is a step-up DC/DC converter designed for driving up to 8 white LEDs in series from a single cell Lithium Ion battery with constant current. Because it directly regulates output current, the PT4103 is ideal for driving light emitting diodes (LEDs) whose light intensity is proportional to the current passing through them, not the voltage across their terminals. A single external resistor sets LED current between 5mA and 20mA, which can then be easily adjusted using either a DC voltage or a pulse width modulated (PWM) signal. Its low 104mV feedback voltage reduces power loss and improves efficiency. The OV pin monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition. The PT4103 is available in SOT23-6 packages.
FEATURES
¨          Drives Up to 8 Series White LEDs from 3.6V
¨          Up to 87% Efficiency
¨          1.2MHz Fixed Switching Frequency
¨          Low 104mV Feedback Voltage
¨          Open Load Shutdown
¨          Soft Start/PWM Dimming
¨          SOT23-6 Packages
APPLICATIONS
¨          Cell phones
¨          Handheld computers and PDAs
¨          Digital cameras
¨          Small LCD displays
TYPICAL APPLICATIONS