Motore di ricerca datesheet componenti elettronici |
|
ADP1655 Scheda tecnica(PDF) 1 Page - Analog Devices |
|
ADP1655 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 24 page Dual LED Flash Driver with I2C-Compatible Interface ADP1655 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother 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 ©2009 Analog Devices, Inc. All rights reserved. FEATURES Ultracompact solution Small 2 mm × 1.5 mm 12-ball WLCSP package Tiny, low profile 2.2 μH power inductor LED current source for local LED grounding and low EMI Synchronous 2 MHz PWM boost convertor, no external diode High efficiency: 88% peak Reduces high levels of input battery current during flash Limits battery current drain in torch mode I2C programmable Currents up to 400 mA in flash mode for two LEDs Currents up to 500 mA in flash mode for one LED with 5% accuracy Currents up to 160 mA in torch mode with 10% accuracy Peak inductor current limit Flash timer Control I2C-compatible control registers External STROBE pin External direct TORCH pin TX_MASK input to prevent high input battery current levels Safety Thermal overload protection Flash timeout Inductor fault detection Output overvoltage Short circuit protection Soft start reduces inrush input current APPLICATIONS Camera-enabled cellular phones and smart phones Digital still cameras, camcorders, and PDAs FUNCTIONAL BLOCK DIAGRAM ADP1655 10µF 2.2µH INPUT VOLTAGE = 2.5V TO 5.5V TORCH SCL/EN1 I2C/EN SGND PGND SDA/EN2 VOUT LED_OUT TX_MASK STROBE VIN SW 10µF Figure 1. L1 INDUCTOR DIGITAL INPUT/ OUTPUT LED ANODE Li-ION + Li-ION + PGND C1 3mm 6.5mm C2 Figure 2. PCB Layout GENERAL DESCRIPTION The ADP1655 is a very compact, highly efficient, dual white LED flash driver for high resolution camera phones, which improves picture and video quality in low light environments. The device integrates a 2 MHz synchronous inductive boost convertor, an I2C-compatible interface and a 500 mA current source. The high switching frequency enables the use of a tiny, low profile 2.2 μH power inductor, and the current source permits LED cathode grounding for thermally enhanced, low EMI and compact layouts. The efficiency is high over the entire battery voltage range to maximize the input power to LED power conversion and minimize battery current draw during flash events. In addition, a Tx-mask input permits the flash LED current to reduce quickly and, therefore, the battery current reduces quickly, during a GSM power amplifier current burst. The I2C-compatible interface enables the programmability of timers, currents, and status bit readback for operation monitoring and safety control. The ADP1655 comes in a compact 12-ball 0.5 mm pitch WLCSP package and is specified over the full −40°C to +125°C junction temperature range. |
Codice articolo simile - ADP1655 |
|
Descrizione simile - ADP1655 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEETIT.COM |
Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |