Charge Pump, 7-Channel 2 Smart LED Driver with I C Interface Data Sheet ADP8860 FEATURES TYPICAL OPERATING CIRCUIT V ALS Charge pump with automatic gain selection of 1, 1.5, and OPTIONAL 2 for maximum efficiency PHOTOSENSOR V OUT Up to two built-in comparator inputs with programmable PHOTOSENSOR modes for ambient light sensing Outdoor, office, and dark modes for maximum backlight 0.1F power savings 0.1F D1 D2 D3 D4 D5 D7 CMP IN 7 independent and programmable LED drivers D3 E3 E4 D4 C4 B4 B3 C3 6 drivers capable of 30 mA (typical) V A3 D6/ IN CMP IN2 1 driver capable of 60 mA (typical) 1F Programmable maximum current limit (128 levels) A2 V OUT VDDIO 1F Standby mode for <1 A current consumption 16 programmable fade in and fade out times nRST E1 C1+ 0.1 sec to 5.5 sec VDDIO A1 C1 ADP8860 Choose from linear, square, or cubic rates 1F C1 C1 Fading override SDA C2 VDDIO 2 I C-compatible interface for all programming C2+ B1 C2 Dedicated reset pin and built-in power-on reset (POR) 1F SCL E2 C2 Short-circuit, overvoltage, and overtemperature protection B2 VDDIO Internal soft start to limit inrush currents Input-to-output isolation during faults or shutdown nINT D2 A4 D1 Operation down to V = 2.5 V with undervoltage lockout IN GND1 GND2 (UVLO) at V = 2.0 V IN Figure 1. Small wafer level chip scale package (WLCSP) or lead frame chip scale package (LFCSP) APPLICATIONS Mobile display backlighting The ADP8860 allows as many as six LEDs to be independently Mobile phone keypad backlighting driven up to 30 mA (typical). A seventh LED can be driven to Dual RGB backlighting 60 mA (typical). All LEDs are programmable for minimum/max- 2 LED indication imum current and fade in/out times via the I C interface. These General backlighting of small format displays LEDs can also be combined into groups to reduce the processor instructions during fade in/out. GENERAL DESCRIPTION Driving this entire configuration is a two-capacitor charge pump The ADP8860 combines a programmable backlight LED charge with gains of 1, 1.5, and 2. This setup is capable of driving a pump driver with automatic phototransistor control. This combi- maximum I of 240 mA from a supply of 2.5 V to 5.5 V. The OUT nation allows for significant power savings because it changes the device includes a variety of safety features including short-circuit, current intensity in office and dark ambient light conditions. By overvoltage, and overtemperature protection. These features performing this function automatically, it eliminates the need for a allow easy implementation of a safe and robust design. Addi- processor to monitor the phototransistor. tionally, input inrush currents are limited via an integrated soft The light intensity thresholds are fully programmable via the start combined with controlled input-to-output isolation. 2 I C interface. A second phototransistor input, with dedicated The ADP8860 is available in two package types, either a compact comparators, improves the ambient light detection levels for 2 mm 2.4 mm 0.6 mm WLCSP (wafer level chip scale package) various user operating conditions. or a small LFCSP (lead frame chip scale package). Rev. 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Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 07967-001ADP8860 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Automatic Dim and Turn Off Timers ..................................... 16 Applications ....................................................................................... 1 Fade Override ............................................................................. 17 General Description ......................................................................... 1 Ambient Light Sensing .............................................................. 17 Typical Operating Circuit ................................................................ 1 Automatic Backlight Adjustment ............................................. 18 Revision History ............................................................................... 2 Independent Sink Control ........................................................ 18 Specif icat ions ..................................................................................... 3 Short-Circuit Protection Mode ................................................ 19 2 I C Timing Diagram .................................................................... 4 Overvoltage Protection .............................................................. 19 Absolute Maximum Ratings ............................................................ 5 Thermal Shutdown/Overtemperature Protection ................. 19 Maximum Temperature Ranges ................................................. 5 Interrupts ..................................................................................... 21 Thermal Resistance ...................................................................... 5 Applications Information .............................................................. 22 ESD Caution .................................................................................. 5 Determining the Transition Point of the Charge Pump ....... 22 Pin Configurations and Function Descriptions ........................... 6 Layout Guidelines....................................................................... 22 Typical Performance Characteristics ............................................. 7 Example Circuits ........................................................................ 23 2 Theory of Operation ...................................................................... 11 I C Programming and Digital Control ........................................ 24 Power Stage.................................................................................. 12 Backlight Register Descriptions ............................................... 28 Operating Modes ........................................................................ 13 Independent Sink Register Descriptions ................................. 35 Backlight Operating Levels ....................................................... 14 Comparator Register Descriptions .......................................... 43 Backlight Maximum and Dim Settings ................................... 15 Outline Dimensions ....................................................................... 47 Automated Fade In and Fade Out ............................................ 15 Ordering Guide .......................................................................... 48 Backlight Turn On/Turn Off/Dim ........................................... 15 REVISION HISTORY 8/2018Rev. 0 to Rev. A Changes to Figure 3 .......................................................................... 6 Updated Outline Dimensions ....................................................... 47 Changes to Ordering Guide .......................................................... 48 Changes to Figure 50 ...................................................................... 48 5/2009Revision 0: Initial Version Rev. A Page 2 of 48