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ADP1653 Fiches technique(PDF) 1 Page - Analog Devices |
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ADP1653 Fiches technique(HTML) 1 Page - Analog Devices |
1 / 24 page Compact, High Efficiency, High Power, Flash/Torch LED Driver with Dual Interface ADP1653 Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved. FEATURES Small 6.4 mm × 7.2 mm solution 2.2 μH power inductor 92% peak efficiency Tx masking within 50 μs 2.1 A, 12 V power switch Pin-selectable interface: 2-bit logic or I2C Programmable flash and torch current Up to 200 mA in torch mode Up to 500 mA in flash mode Programmable indicator LED current up to 20 mA Programmable timer register: up to 820 ms flash timeout 2.75 V to 5.5 V input voltage range Low noise, 1.2 MHz PWM operation Safety features Interrupt output pin Fault condition register Short-circuit protection Output overvoltage protection Thermal overload protection Integrated current limit and soft start Small 3 mm × 3 mm, 16-lead LFCSP footprint APPLICATIONS Camera-enabled cellular phones, smart phones Digital still cameras, camcorders, PDAs GENERAL DESCRIPTION The ADP1653 is a very compact, high efficiency, high power, camera flash LED driver optimized for cellular phones. The high efficiency and dynamic LED current control of the device improve flash brightness and picture quality in dimly lit environments. Efficiency peaks at 92% and is higher than charge pump solutions over the Li-Ion battery range. The device has a dual-mode interface that is configurable to 2-bit logic or an I2C® interface. The indicator and high power LED currents are programmable with external resistors or through the I2C interface. To maximize overall flash brightness, the ADP1653 offers an input to reduce flash LED current in less than 50 μs, referred to as the Tx mask. Tx masking reduces battery stress by scaling back flash LED current during an RF transmission. The ADP1653 solution requires only four external components in I2C mode and fits in a 6.4 mm × 7.2 mm space. The part inte- grates multiple safety features such as soft start, flash timeout, output current limit, thermal protection, and overvoltage protection. The ADP1653 operates over the −40°C to +125°C junction temperature range. TYPICAL OPERATING CIRCUIT 16 15 14 13 5 6 7 8 12 11 10 9 1 2 3 4 ADP1653 4.7µF 4.7µF ONE OR TWO LEDs UP TO 10.2V 2.2µH INPUT VOLTAGE = 2.75V TO 5.5V VDD TxMASK OPTIONAL SETT SETF CTRL1/SCL CTRL0/SDA EN STR VDD LX SETI ILED OUT GND PGND INTF HPLED INT OFF ON OFF ON Figure 1. PCB LAYOUT ADP1653 R5 R4 D1 C1 C2 INDUCTOR LI-ION + GND L1 INPUT CAPACITOR OUTPUT CAPACITOR SCHOTTKY DIODE PGND 7.2mm TO WHITE LEDs FROM WHITE LEDs L = FDSE0312-2R2 CIN = GRM219R61A475K D1 = BAT20J COUT = GRM21BR61C475K 6.4mm OPTIONAL (Tx MASK ONLY) Figure 2. |
Numéro de pièce similaire - ADP1653_15 |
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Description similaire - ADP1653_15 |
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