PT4102 Datasheet | Micro Bridge Technology

Step-up White LED Driver GENERAL DESCRIPTION The PT4102 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 PT4102 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 5m A and 20m A, which can then be easily adjusted using either a DC voltage or a pulse width modulated (PWM) signal. The PT4102 switches at 1.2MHz, allowing the uses of tiny external ponents. The output capacitor can be as small as 0.22u F. Its low 88/104m V feedback voltage reduces power loss and improves efficiency. The PT4102 is available in SOT-23-5 and SC-70 packages. Features APPLICATIONS - Built-in 40V Power MOSFET - Drives Up to 8 Series White LEDs from 3.6V - Up to 87% Efficiency - 1.2MHz Fixed Switching Frequency - Low Feedback Voltage:104m V for E-suffix, 88m V for S-suffix. - PWM or DC Dimming - Current Limit - 0.22u F Output Capacitor - Package: SOT-23-6 and SC-70 - Cell Phones - Handheld puters and PDAs - Digital Cameras - Small LCD Displays TYPICAL APPLICATIONS Figure 1. Li-Ion Driver for 4 White LEDs Micro Bridge Technology Co.,Ltd. .micro-bridge. Page 1 ORDERING INFORMATION Step-up White LED Driver PACKAGES PIN DESCRIPTION Pin No. SOT-23-6 SC70 2,...