The SKY81299 is a high-efficiency, 2.4 A high-current boost converter with two independently programmable constant current outputs. The device is intended for LED photo flash/facial recognition and “selfie” front-facing camera flash applications in all single-cell Li-ion powered portable products. The SKY81299 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 SKY81299 ideally suited for small batterypowered 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 I2C digital interface is used to program the SKY81299 LED Flash and Movie modes. Device operations are fully configurable; Movie and Flash current level, current limits, and fault reporting are managed through I2C. Also included are separate flash enable inputs to initiate the flash operation and a flash inhibit input either to reduce the flash current to Moviemode levels or to shut off the flash current during high battery demand conditions.
The SKY81299 is available in a small 1.903 x 1.903 x 0.605 mm, 16-bump Wafer-Level Chip Scale (WLCSP) package.
| Skyworks Solutions, Inc. | |
|---|---|
| Product Category | LED Drivers |
| Product Number | SKY81299 |
| Product Name | 2.4 A Two-Channel Flash LED Driver |
| Form Factor | Intgrated Circuit (IC) |
| Input Voltage | 2.5 to 5.5 volts |
| Output Voltage | 5.5 volts |
| Output Current | 2400 milliamps |
