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ADP1650 Datasheet(PDF) 1 Page - Analog Devices |
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ADP1650 Datasheet(HTML) 1 Page - Analog Devices |
1 / 2 page 1.5 A LED Flash Driver with I2C-Compatible Interface ADP1650 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother 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 ©2010 Analog Devices, Inc. All rights reserved. FEATURES Ultracompact solution Small, 2 mm × 1.5 mm, 12-ball WLCSP package Smallest footprint, 1 mm height, 1 μH power inductor LED current source for local LED grounding Simplified routing to/from LED Improved LED thermals Synchronous 3 MHz PWM boost converter, no external diode High efficiency: 90% peak Reduces high levels of input battery current during flash Limits battery current drain in torch mode I2C programmable Currents up to 1500 mA in flash mode for one LED with 7% accuracy over all conditions Currents up to 200 mA in torch mode Programmable dc battery current limit (4 settings) Programmable flash timer up to 1600 ms Low VBAT mode to reduce LED current automatically 4-bit ADC for LED V F, die/LED temperature readback Control I2C-compatible control registers External STROBE and torch input pins 2 transmitter mask (TxMASK) inputs Safety Thermal overload protection Inductor fault detection LED short-/open-circuit protection APPLICATIONS Camera-enabled cellular phones and smart phones Digital still cameras, camcorders, and PDAs FUNCTIONAL BLOCK DIAGRAM ADP1650 10µF 1.0µH INPUT VOLTAGE = 2.7V TO 5.0V VOUT PGND SW STROBE 10µF LED_OUT EN SGND SCL SDA TX1/TORCH TX2/ILED/ADC GPIO1 GPIO2 MAX 1.5A VIN Figure 1. DIGITAL INPUT/ OUTPUT Li-ION + Li-ION + PGND C1 L1 INDUCTOR LED ANODE C2 AREA = 16.4mm2 Figure 2. PCB Layout GENERAL DESCRIPTION The ADP1650 is a very compact, highly efficient, single white LED flash driver for high resolution camera phones that improves picture and video quality in low light environments. The device integrates a programmable 1.5 MHz or 3.0 MHz synchronous inductive boost converter, an I2C-compatible interface, and a 1500 mA current source. The high switching frequency enables the use of a tiny, 1 mm high, low cost, 1 µH power inductor, and the current source permits LED cathode grounding for thermally enhanced, low EMI, and compact layouts. The LED driver maximizes efficiency over the entire battery voltage range to maximize the input-power-to-LED-power conversion and minimize battery current draw during flash events. A programmable dc battery current limit safely maximizes LED current for all LED VF and battery voltage conditions. Two independent TxMASK inputs permit the flash LED current and battery current to reduce quickly during a power amplifier current burst. The I2C-compatible interface enables the pro- grammability of timers, currents, and status bit readback for operation monitoring and safety control. The ADP1650 comes in a compact 12-ball, 0.5 mm pitch package and operates within specification over the full −40°C to +125°C junction temperature range. For more information about the ADP1650, contact Analog Devices, Inc., Sales Office, at http://www.analog.com/sales. |
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