ADD5205
FEATURES
White LED driver based on inductive boost converter Input voltage range: 2.8 V to 18 V Internal pensation 1 MHz fixed operating frequency 28 V fixed overvoltage protection Built-in soft start for boost converter Drives up to 4 LED current sources LED current adjustable up to 25 m A for each channel DC current level brightness control with PWM input LED open fault protection General Thermal shutdown Undervoltage lockout 12-lead, 3 mm × 3 mm × 0.75 mm LFCSP package
FUNCTIONAL BLOCK DIAGRAM
STEP-UP SWITCHING REGULATOR 4-CHANNEL CURRENT SOURCES BRIGHTNESS CONTROL LOGIC UNDERVOLTAGE LOCKOUT SOFT START THERMAL PROTECTION OVERVOLTAGE PROTECTION AUTODISABLE FOR LED OPEN
Figure 1.
APPLICATIONS
Smart PCs, PMPs, tablet PCs, UMPCs, and notebooks
GENERAL DESCRIPTION
The ADD5205 is a white LED driver for backlight applications based on high efficiency, current mode, step-up converter technology. It is designed with a 0.3 Ω internal switch and 1 MHz fixed operating frequency. The...
