Compact, High Efficiency, High Power, Flash/Torch LED Driver with Dual Interface Data Sheet ADP1653 FEATURES GENERAL DESCRIPTION Small 6.4 mm 7.2 mm solution The ADP1653 is a very compact, high efficiency, high power, 2.2 H power inductor camera flash LED driver optimized for cellular phones. The 92% peak efficiency high efficiency and dynamic LED current control of the device Tx masking within 50 s improve flash brightness and picture quality in dimly lit 2.1 A, 12 V power switch environments. Efficiency peaks at 92% and is higher than 2 Pin-selectable interface: 2-bit logic or I C charge pump solutions over the Li-Ion battery range. Programmable flash and torch current The device has a dual-mode interface that is configurable to 2-bit Up to 200 mA in torch mode 2 logic or an I C interface. The indicator and high power LED Up to 500 mA in flash mode currents are programmable with external resistors or through the Programmable indicator LED current up to 20 mA 2 I C interface. To maximize overall flash brightness, the ADP1653 Programmable timer register: up to 820 ms flash timeout offers an input to reduce flash LED current in less than 50 s, 2.75 V to 5.5 V input voltage range referred to as the Tx mask. Tx masking reduces battery stress by Low noise, 1.2 MHz PWM operation scaling back flash LED current during an RF transmission. Safety features The ADP1653 solution requires only four external components Interrupt output pin 2 in I C mode and fits in a 6.4 mm 7.2 mm space. The part inte- Fault condition register grates multiple safety features such as soft start, flash timeout, Short-circuit protection output current limit, thermal protection, and overvoltage Output overvoltage protection protection. Thermal overload protection Integrated current limit and soft start The ADP1653 operates over the 40C to +125C junction Small 3 mm 3 mm, 16-lead LFCSP footprint temperature range. APPLICATIONS Camera-enabled cellular phones, smart phones Digital still cameras, camcorders, PDAs TYPICAL OPERATING CIRCUIT PCB LAYOUT INPUT VOLTAGE = 2.75V TO 5.5V GND LI-ION + INPUT CAPACITOR 4.7F INDUCTOR 2.2H C1 ON ON L1 UP TO 10.2V OFF OFF SCHOTTKY DIODE 4.7F 16 15 14 13 D1 STR EN V LX DD 1 PGND 12 SETT OPTIONAL ONE OR 7.2mm TWO 2 11 TxMASK SETF INT C2 TO WHITE LEDs ADP1653 LEDs OUTPUT CAPACITOR 3 10 CTRL1/SCL INTF PGND R5 4 9 L = FDSE0312-2R2 CTRL0/SDA HPLED CIN = GRM219R61A475K SETI ILED OUT GND D1 = BAT20J COUT = GRM21BR61C475K 5 6 7 8 R4 ADP1653 FROM WHITE LEDs V DD OPTIONAL (Tx MASK ONLY) Figure 1. 6.4mm Figure 2. Rev. C 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 20072017 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. 06180-001 06180-036ADP1653 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................9 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 13 General Description ......................................................................... 1 White LED Driver ...................................................................... 13 Typical Operating Circuit ................................................................ 1 2-Bit Logic Interface Mode (INTF = 1) ................................... 14 2 PCB Layout ........................................................................................ 1 I C Interface Mode (INTF = 0)................................................. 14 Revision History ............................................................................... 2 Turning on the Flash and Watchdog Timer ........................... 15 Specifications ..................................................................................... 3 Safety Features ............................................................................ 16 2 I C Timing Specifications ............................................................ 5 Applications Information .............................................................. 17 Absolute Maximum Ratings ............................................................ 6 Flash Current Foldback During Transmit Pulse .................... 17 Thermal Resistance ...................................................................... 6 External Component Selection ................................................ 18 Boundary Condition .................................................................... 6 PCB Layout ................................................................................. 20 ESD Caution .................................................................................. 6 Outline Dimensions ....................................................................... 22 Pin Configuration and Function Descriptions ............................. 7 Ordering Guide .......................................................................... 22 REVISION HISTORY 4/2017Rev. B to Rev. C Changed CP-16-3 to CP-16-27 .................................... Throughout Changes to Figure 2 .......................................................................... 1 Changes to Figure 4 and Table 5 ..................................................... 7 Changes to Figure 34 ...................................................................... 20 Updated Outline Dimensions ....................................................... 22 Changes to Ordering Guide .......................................................... 22 9/2007Rev. A to Rev. B Changes to Table 1 ............................................................................ 3 Changes to Table 5 ............................................................................ 7 2 Changes to I C Interface Mode (INTF = 0) Section .................. 14 Changes to Safety Features Section .............................................. 16 Inserted Table 9 and Table 10 ........................................................ 18 Inserted Table 11 and Table 12...................................................... 19 1/2007Revision A: Initial Version Rev. C Page 2 of 24