PRODUCT SUMMARY 2 SKY81292: 1.8 A Single or Dual Flash LED Driver with I C Control Interface Applications Description The SKY81292 is a high-efficiency, 1.8 A high-current boost LED photo flash with Movie/Torch modes converter with a programmable constant current. The device is Camera enabled mobile devices intended for LED photo flash applications in all single-cell Li-ion Cell phones/smartphones powered portable products. Digital still cameras The SKY81292 maintains the flash LED output current using a DC- DC step-up converter with a bypass function to maximize Multimedia mobile phones efficiency when under all load conditions. For single flash LED applications, the flash current can be programmed up to 1.8 A. Features For dual flash LED applications, the flash current can be programmed up to 900 mA. This provides a direct flash LED Input voltage range: 2.5 V to 5.5 V cathode connection to the ground plane that helps heat Supports single and dual flash LEDs dissipation. Up to 1.8 A regulated output current The high frequency 2 MHz DC-DC boost switching frequency allows the use of a small external inductor and output capacitor, Up to 90% efficiency which makes the SKY81292 ideally suited for small battery- Switching frequency: 2 MHz powered applications. A start-up control circuit automatically True load disconnect senses the flash LED forward voltage at any programmed output current setting and determines the most efficient operation mode. Soft-start and input current limit 2 An industry standard I C digital interface is used to program the Separate flash enable SKY81292 LED flash and movie modes. Device operations are 2 Industry standard I C programming: fully configurable movie and flash current level, current limits, Flash and Movie mode current and fault reporting. Also included is a separate flash enable input Battery current limit to initiate the flash operation and a flash inhibit input to reduce the Input voltage monitor with programmable thresholds flash current to movie-mode levels during high battery demand Programmable safety timer conditions. An additional low-level programmable current source Fault readback output is provided to drive an LED indicator lamp. Fault protection: The integrated thermal management system protects the device in Flash timer the event of an output short-circuit condition. An NTC thermistor Over-voltage (open LED, open circuit) function protects the external flash LEDs from thermal damage. Short circuit 2 Fault status may be read using the I C interface after the system is Over-temperature protection alerted by an open drain fault flag. Built-in soft-start circuitry NTC resistor flash LED temperature sense prevents excessive in-rush current during start-up. The shutdown Flash mode input voltage monitor feature reduces quiescent current to less than 1.0 A. Open drain fault flag output The SKY81292 is provided in a small, 16-bump, 2 mm x 2 mm Independent current source for LED indicator lamp Wafer Level Chip Scale Package (WLCSP). The pin configuration Small WLCSP (16-bump, 2 mm x 2 mm) package (MSL1, and package are shown in Figure 1. 260 C per JEDEC J-STD-020) package Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 202542A Skyworks Proprietary Information Products and Product Information Are Subject To Change Without Notice November 27, 2012 1 2 PRODUCT SUMMARY SKY81292 FLASH LED DRIVER WITH I C CONTROL INTERFACE Figure 1. SKY81292 Pinout 16-Bump WLCSP Package (Top View) Ordering Information Model Name Manufacturing Part Number Evaluation Board Part Number 2 SKY81292 Flash LED Driver with I C Control Interface SKY81292-11-001 TW21-D260 Copyright 2012 Skyworks Solutions, Inc. 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Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 November 27, 2012 Skyworks Proprietary Information Products and Product Information Are Subject To Change Without Notice 202542A