4-Channel High Current LED Driver with Adaptable Power Control Data Sheet ADP8140 FEATURES TYPICAL APPLICATION CIRCUITS Highly integrated feature set for a high brightness LED driver solution with minimal external components VCC 4 current sink channels with an adjustable current from 125 A to 500 mA NTC Analog and pulse-width modulation (PWM) dimming inputs Analog and PWM LED current outputs 2% (maximum) matching between LED channels 5% (maximum) LED current accuracy ADP8140 Operates from V of 3 V to 30 V higher voltages easily IN accomplished with an external Zener diode VIN MIN REG VT Operates with LED anode supply voltages up to 100 V dc MODE DIM Feedback output controls external power source for optimal ENABLE EN SINK1 efficiency and safety FAULT FAULT SINK2 Multiple ADP8140 IC operation in parallel to control one FB OUT SINK3 power supply COMP SINK4 ISET VO SNS Integrated error amplifier for secondary side control of EXPOSED PAD isolated power supplies Easy connection of a temperature thermistor or light sensor Provides robust protection of the entire system Figure 1. ADP8140 Used with Shunt Regulator Power supply overvoltage protection LED overtemperature protection AGND VCC BST LED short-circuit protection FB VIN LED open-circuit protection ADP2441 BUCK REGULATOR IC overtemperature protection COMP SW Shorted ISET protection EN PGND Open ISET and EN protection PGOOD FREQ SS Standby mode for low current consumption Fault indicator output ADP8140 VIN Small, thermally enhanced, LFCSP package (4 mm 4 mm) VIN MIN REG VT APPLICATIONS MODE DIM High brightness LED lighting EN SINK1 Large format LED backlighting FAULT SINK2 SINK3 FB OUT COMP SINK4 ISET VO SNS EXPOSED PAD Figure 2. ADP8140 Used with Buck GENERAL DESCRIPTION The ADP8140 provides high current control of up to four LED circuits, overvoltages, and LED open circuits. Multiple drivers. Each driver can sink up to 500 mA. The sink current is ADP8140 ICs are easily connected in parallel to drive additional programmed for all four drivers with one external resistor. LED strings or higher current LEDs. The ADP8140 is available in a small, thermally enhanced, lead frame chip scale package The device features a feedback output that controls an external (LFCSP). power supply for optimal efficiency. The ADP8140 also protects the LEDs, power supply, and itself against thermal events, short Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20152020 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 10935-001 10935-039ADP8140 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 MODE Pin Operation ................................................................ 13 Applications ....................................................................................... 1 Power Control Modes ................................................................ 13 Typical Application Circuits ............................................................ 1 Dimming the LED Current ....................................................... 14 General Description ......................................................................... 1 Reducing the LED Current with the DIM Pin ....................... 15 Revision History ............................................................................... 2 Dimming LEDs with the VT Pin ............................................. 15 Specificat ions ..................................................................................... 3 Fault Protections ......................................................................... 15 Absolute Maximum Ratings ............................................................ 6 LED Open-Circuit and Short-Circuit Protection .................. 16 Maximum Temperature Ranges ................................................. 6 Die Temperature Protection ..................................................... 17 Thermal Resistance ...................................................................... 6 Using Multiple ADP8140 ICs ................................................... 17 ESD Caution .................................................................................. 6 Operating the ADP8140 from Higher Input Voltages .......... 18 Pin Configuration and Function Descriptions ............................. 7 Effect of LED VF Mismatch ....................................................... 18 Typical Performance Characteristics ............................................. 8 Managing the Power Dissipation of the ADP8140 ................ 19 Theory of Operation ...................................................................... 11 Layout Guidelines....................................................................... 19 Start-Up Sequence ...................................................................... 11 Ordering Options ....................................................................... 19 Current Sinks .............................................................................. 12 Outline Dimensions ....................................................................... 23 Power Control Operation .......................................................... 12 Ordering Guide .......................................................................... 23 REVISION HISTORY 9/2020Rev. A to Rev. B Changes to Figure 36 ...................................................................... 22 9/2018Rev. 0 to Rev. A Updated Outline Dimensions ....................................................... 23 Changes to Ordering Guide .......................................................... 23 2/2015Revision 0: Initial Version Rev. B Page 2 of 23