Charge Pump Driven 9-Channel LED Driver with Automated LED Lighting Effects Data Sheet ADP8866 FEATURES APPLICATIONS Charge pump with automatic gain selection of 1, 1.5, and Mobile display backlighting 2 for maximum efficiency Mobile phone keypad backlighting 92% peak efficiency LED indication and status lights 9 independent and programmable LED drivers Automated LED blinking Each driver is capable of 25 mA (full scale) TYPICAL OPERATING CIRCUIT Each driver has 7 bits (128 levels) of nonlinear current settings Standby mode for <1 A current consumption D1 D2 D3 D4 D5 D6 D7 D8 D9 16 programmable fade-in and fade-out times (0.0 sec to VIN 1.75 sec) with choice of square or cubic rates 1F Automated and customizable LED blinking VOUT Unique heartbeat mode for programmable double pulse 1F nRST lighting effects on 4 channels (D6 to D9) ADP8866 PWM input for implementing content adjustable brightness C1+ SDA C1 control (cABC) 1F C1 2 I C compatible interface for all programming SCL Dedicated reset pin and built-in power on reset (POR) C2+ Short circuit, overvoltage, and overtemperature protection C2 nINT 1F C2 Internal soft start to limit inrush currents Input to output isolation during faults or shutdown GND Operates down to V = 2.5 V, with undervoltage lockout IN Figure 1. (UVLO) at 1.9 V Small lead frame chip scale package (LFCSP) GENERAL DESCRIPTION Driving all of this is a two-capacitor charge pump with gains of The ADP8866 combines a programmable backlight LED charge 1, 1.5, and 2. This setup is capable of driving a maximum pump driver with automatic blinking functions. Nine LED drivers I of 240 mA from a supply of 2.5 V to 5.5 V. A full suite of can be independently programmed at currents up to 25 mA. OUT safety features including short-circuit, overvoltage, and over- The current level, fade time, and blinking rate can be programmed temperature protection allows easy implementation of a safe once and executed autonomously on a loop. Separate fade-in and robust design. Additionally, input inrush currents are and fade-out times can be set for the backlight LEDs. limited via an integrated soft start combined with controlled input to output isolation. Rev. 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Technical Support www.analog.com 09478-001ADP8866 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Automated Fade-in and Fade-Out ........................................... 14 Applications ....................................................................................... 1 CABC Fade Disable.................................................................... 15 Typical Operating Circuit ................................................................ 1 Independent Sink Control (ISC) .............................................. 15 General Description ......................................................................... 1 Advanced Blinking Controls .................................................... 16 Revision History ............................................................................... 2 Short-Circuit Protection (SCP) Mode ..................................... 17 Specifications ..................................................................................... 3 Overvoltage Protection (OVP) ................................................. 17 Absolute Maximum Ratings ............................................................ 5 Thermal Shutdown (TSD)/Overtemperature Protection ..... 17 Maximum Temperature Ranges ................................................. 5 Interrupts ..................................................................................... 19 Thermal Resistance ...................................................................... 5 Backlight Off Interrupt .............................................................. 19 ESD Caution .................................................................................. 5 Independent Sink Off Interrupt ............................................... 19 Pin Configurations and Function Descriptions ........................... 6 Applications Information .............................................................. 20 Typical Performance Characteristics ............................................. 7 Layout Guidelines....................................................................... 20 2 Theory of Operation ...................................................................... 11 I C Programming and Digital Control ........................................ 21 Power Stage.................................................................................. 12 Register Descriptions ..................................................................... 22 Operating Modes ........................................................................ 13 Backlight Register Descriptions ............................................... 29 LED Groups................................................................................. 14 Independent Sink Register Descriptions ................................. 34 Output Current Settings ............................................................ 14 Outline Dimensions ....................................................................... 50 Output Current Range Selection .............................................. 14 Ordering Guide .......................................................................... 50 PWM Dimming .......................................................................... 14 REVISION HISTORY 11/2017Rev. A to Rev. B Changed CP-20-10 to CP-20-8 .................................... Throughout Updated Outline Dimensions ....................................................... 50 Changes to Ordering Guide .......................................................... 50 1/2014Rev. 0 to Rev. A Changes to Figure 40 and Figure 41 ............................................. 21 3/2011Revision 0: Initial Version Rev. B Page 2 of 52