skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 203693a ? skyworks proprietary information ? products and product information are s ubject to change without notice ? aug ust 31, 2015 1 product summary sky81298: 2.4 a three-channel flash led driver with i 2 c control interface applications ? led photo flash with movie/torch mode ? tri/dual tone led for color compensation ? selfie flash for front-facing camera (pip enabled) ? smartphones/tablets features ? input voltage range: 2.5 v to 5.5 v ? each channel can program up to 1.5 a with 12 ma step size; up to 2.4 a total combined output current ? > 90% led efficiency at 250 ma (3.3 v < v in < 3.6 v, v f = 3.3 v); > 85% led efficiency at 1 a (3.4 v< v in < 3.9 v, v f = 3.3 v) ? 2.75 mhz switching frequency ? soft-start and input current limit ? separate flash enable/flash inhibit ? programmable blinking led notification ? industry standard 1 mhz i 2 c programming ? flash and movie mode current ? input voltage monitor with programmable thresholds ? current read-back in input voltage monitor operation ? programmable safety timer ? fault read back ? fault protection ? integrated safety timer ? over-voltage (open led, open circuit) ? short circuit ? over-temperature protection ? flash mode input voltage monitor ? open-drain fault output ? temperature range: ?40 ? c to +85 ? c ? small wlcsp (16-bump, 1.903 ? 1.903 ? 0.605 mm, 0.4 mm pitch) package (msl1, 260 ? c per jedec j-std-020) s kywork s green tm product s are compliant with all applicable legi s lation and are halogen-free. for additional information, refer to skyworks de?ition of green tm , document number s q04C0074. description the sky81298 is a high-efficiency, high-current boost converter with three independently programmable constant current outputs. the device is optimized for led flash applications implementing tri-tone flash led color compensation, or dual rear led flash plus single front led flash to support selfie pictures taken from the front-facing camera. the sky81298 uses a single dc/dc boost and only one inductor to support all three led outputs, and all led outputs may be enabled simultaneously to support up to a total of 2.4 a total led current. the sky81298 maintains the flash led output current using a dc-dc step-up converter with a bypass function to maximize efficiency under all load conditions. the flash current for each channel can be programmed up to 1.5 a at 12 ma step. the device uses a common cathode (current source) topology to allow a direct flash led cathode connection to the ground plane which facilitates led heat dissipation. the total combined output current for flash outputs is 2.4 a. the high-frequency 2.75 mhz dc-dc boost switching frequency allows the use of a small external inductor and output capacitor, which makes the sky81298 ideally suited for small battery- powered applications. a startup control circuit automatically senses the flash led forward voltage at any programmed output current setting and determines the most efficient operation mode. an industry standard i 2 c digital interface is used to program the sky81298 led flash and movie modes. device operations are fully configurable; movie and flash current level, current limits, and fault reporting are managed through i 2 c. also included are separate flash enable inputs to initiate the flash operation and a flash inhibit input either to reduce the flash current to movie- mode levels or to shut off the flash current during high battery demand conditions. the flash enable inputs can be configured to control different flash leds as required by the system designer. the sky81298 is available in a small 1.903 ? 1.903 ? 0.605 mm, 16-bump wafer-level chip scale (wlcsp) package. the typical application circuits are shown in figures 1a and 1b.
product summary ? sky81298: 2.4 a three- channel flash led driver with i 2 c control interface skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 2 august 31, 2015 ? skyworks proprietary in formation ? products and product inform ation are subject to change without notic e ? 203693a white fla s h led amber fla s h led white led (can be u s ed a s indicator) s el?e fla s h/indicator dual rear fla s h gnd pgnd l1 1.0 h c in 4.7 f c out 4.7 f sky 8 12 98 s w in out fl1 fl2 fl3 flen 1 v in fla s h 1 enable fla s h inhibit s da i 2 c s erial data input sc l i 2 c s erial c lock input flen 2 flinh fla s h 2 enable en device enable t0 69 1 figure 1a. sky81298 typical application diagram fo r dual rear flash and front selfie flash white fla s h led amber fla s h led neutral fla s h led tri-tone rear fla s h gnd pgnd l1 1.0 h c in 4.7 f c out 4.7 f sky 8 12 98 s w in out fl1 fl2 fl3 flen 1 v in fla s h 1 enable fla s h inhibit s da i 2 c s erial data input sc l i 2 c s erial c lock input flen 2 flinh fla s h 2 enable en device enable t0 69 2 figure 1b. sky81298 typical application diagram for tri-tone rear flash
product summary ? sky81298: 2.4 a three- channel flash led driver with i 2 c control interface skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 203693a ? skyworks proprietary information ? products and product information are s ubject to change without notice ? aug ust 31, 2015 3 ordering information model name total output current with v in monitor function with blinking function manufacturing part number sky81298-11 2.4 a yes yes sky81298-11-001 sky81298-12 2.4 a yes no sky81298-12-001 SKY81298-13 2.4 a no yes SKY81298-13-001 sky81298-14 2.4 a no no sky81298-14-001 sky81298-21 2 a yes yes sky81298-21-001 sky81298-22 2 a yes no sky81298-22-001 sky81298-23 2 a no yes sky81298-23-001 sky81298-24 2 a no no sky81298-24-001 copyright ? 2015 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyw orks solutions, inc. (skyworks) products or services. these m aterials, including the information co ntained herein, are provided by skyworks as a service to its customers and may be used for info rmational purposes only by the customer. skyworks assumes no res ponsibility for errors or omissions in these materials or the information contained herein. skyworks may change its documentat ion, products, services, specific ations or product descriptions at any time, without notice. sk yworks makes no commitment to update the materials or information and shall have no responsib ility whatsoever for conflicts, incompatibilities, or other diff iculties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document . skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, re production or use of skyworks products, information or mate rials, except as may be provided in skyworks terms and conditions of sale. the materials, products and information are pr ovided as is without warranty of any ki nd, whether express, implied, statutory, or otherwise, includin g fitness for a particular purpose or use, merchantability, performance, quality or non-infrin g ement of any intellectual property ri g ht; all such warranties are hereby expressly disclaimed. skyworks does not warra nt the accuracy or completeness of the information, text, g raphics or other items contained within these ma terials. skyworks shall not be liable for any dama g es, includin g but not limited to any special, indirect, incidental, statutory, or consequential dama g es, includin g without limitation, lost revenues or lost profits that may result from the use of the materials or information, whet her or not the recipient of mat erials has been advised of the possibility of such dama g e. skyworks products are not intended for use in medical, lifesavi ng or life-sustaining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or environmental damage. skyworks customers using or selling skyworks products for use in such applications do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications us ing skyworks products, which ma y deviate from published specifi cations as a result of design defects, errors, or operation of products outside of published pa rameters or design specifications. customers sh ould include design and operating safeguards to minimize these and other risks. skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of skyworks products outsid e of stated published specifications or parameters. skyworks and the skyworks symbol are trademar ks or registered trademarks of skyworks solutions, inc., in the united states and other countries. third-party brands and names are for identification purposes only, and are the property of their resp ective owners. additional inform ation, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
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