SKY81294-12-001

PRODUCT SUMMARY SKY81294: 1.5 A Single Flash LED Driver with I2C Control Interface Applications Description  LED photo flash with Movie/Torch mode The SKY81294 is a high-efficiency, 1.5 A high-current boost converter with a programmable constant current. The device is intended for LED photo flash applications in all single-cell Li-Ion powered portable products.  IR facial recognition  Camera-enabled mobile devices  Cell phones/smartphones  Digital still cameras Features  Input voltage range: 2.5 V to 5.5 V  Up to 1.5 A regulated output current  Up to 90% efficiency  2.75 MHz switching frequency  Soft-start and input current limit  Separate flash enable/flash inhibit  Programmable blinking LED notification  Industry standard I2C programming:      Flash and Movie mode (MM) current Input voltage monitor with programmable thresholds Current read-back in input voltage monitor operation Programmable safety timer Fault read back  Fault protection:        Integrated flash safety timer Over-voltage protection (open LED, open circuit) Short circuit Over-temperature protection Programmable inductor current limit Flash mode input voltage monitor Open-drain fault output (only for 16-bump version) The SKY81294 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 can be programmed up to 1.5 A. This provides a direct flash LED cathode connection to the ground plane that helps heat dissipation and simplifies PCB routing. 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 SKY81294 ideally suited for small batterypowered applications. A start-up 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 I2C digital interface is used to program the SKY81294 LED Flash and Movie modes. Device operations are fully configurable, such as for movie and flash current level, current limits, and fault reporting. The SKY81294 has a separate flash enable input 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 inhibit mode can be programmed through the FLINHM bit set. Fault status may be read using the I2C interface after the system is alerted by an open-drain fault flag. Built-in circuitry prevents excessive inrush current during start-up. The SKY81294 is provided in small, 16-bump/9-bump, 1.741 mm  1.741 mm Wafer Level Chip Scale Packages (WLCSP). A typical application circuit is shown in Figure 1.  40 ºC to +85 ºC temperature range  Small WLCSP (16-bump, 1.741 mm  1.741 mm, 0.4 mm pitch; 9-bump, 1.741 mm  1.741 mm, 0.5 mm pitch) packages (MSL1, 260 ºC per JEDEC J-STD-020) Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 203177B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • June 18, 2014 1 PRODUCT SUMMARY • SKY81294: 1.5 A SINGLE FLASH LED DRIVER WITH I2C CONTROL INTERFACE L1 1.0 µH VIN 2.5 V to 5.5 V IN SW OUT COUT 4.7 µF CIN 2.2 µF I2C Serial Data Input I2C Serial Clock Input FL SDA SCL SKY81294 Flash LED FLEN FLINH Flash Enable Flash Inhibit VIN Open Drain Fault Flag (Only for SKY81294-12) FLT AGND PGND t0071 Figure 1. SKY81294 Typical Application Circuit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 2 June 18, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 203177B PRODUCT SUMMARY • SKY81294: 1.5 A SINGLE FLASH LED DRIVER WITH I2C CONTROL INTERFACE Ordering Information Model Name Package Manufacturing Part Number Evaluation Board Part Number SKY81294: 1.5 A Single Flash LED Driver with I2C Control Interface 1.75 mm  1.75 mm, 16-bump WLCSP SKY81294-12-001 SKY81294-12-EVB 1.75 mm  1.75 mm, 9-bump WLCSP SKY81294-14-001 SKY81294-14-EVB Copyright © 2014 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 203177B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • June 18, 2014 3