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GRM188R71A225KE15 Datasheet(PDF) 9 Page - Skyworks Solutions Inc. |
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GRM188R71A225KE15 Datasheet(HTML) 9 Page - Skyworks Solutions Inc. |
9 / 17 page AAT1274 1.5A Single Flash LED Driver IC DATA SHEET 9 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Functional Description The AAT1274 is a boost converter with a current regu- lated output designed to drive high current white LED used in camera flash applications. The AAT1274 has a constant current sink channel to accurately regulate the current flow through a high current, high intensity white flash LED. The AAT1274 has two basic operating modes; a flash mode controlled by the FLEN pin and the movie/ torch light mode controlled through the AS2Cwire inter- face. Flash Mode A flash pulse may be initiated by pulling the FLEN input pin from a logic low-to-high state, which initiates a flash pulse. The maximum flash current in the AAT1274 is set by an external resistor, RSET, which sets the flash current and the maximum movie-mode current. In mobile GSM systems where the phone remains in constant contact with the base station by regular com- munication, a FLINH pin is provided to prevent both the camera flash and PA transmission pulses from occurring simultaneously. This avoids potential dips to the Li-ion battery voltage below the system’s undervoltage lockout threshold (UVLO). During a flash event, strobing the FLINH pin low-to-high reduces the LED current to the default movie-mode current level for the duration of FLINH. Strobing FLINH high-to-low instructs the AAT1274 to revert the flash LED current to its maximum level, assuming that the FLEN pin is still active (high). Movie (Torch) Mode The movie / torch mode current level, and the flash to maximum movie mode current ratio are programmed by the AAT1274 AS2Cwire interface. The movie-mode cur- rent level can be adjusted to one of 16 steps using a logarithmic scale where each code level is 1dB below the previous code. The flash to maximum movie mode cur- rent ratio can be set from 1:2 to 1:30 with respect to the maximum programmed flash current as set by the RSET resistor. The manual FLEN signal has priority over movie- mode operation. Functional Block Diagram System Control Enable and AS2C Interface OUT (to Flash LED) FL FLGND RSET PGND AGND FLEN EN/SET IN SW FLINH |
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