SKY81294中文资料1.5 A Single Flash LED Driver with I²C Control Interface数据手册Skyworks规格书

描述 Description

Please note: this product is being discontinued and is not recommended for new designs.

The SKY81294 is a high-efficiency, 1.5 A high-current boostconverter with a programmable constant current. The device isintended for LED photo flash applications in all single-cell Li-Ionpowered portable products.The SKY81294 maintains the flash LED output current using aDC-DC step-up converter with a bypass function to maximizeefficiency under all load conditions. The flash current can beprogrammed up to 1.5 A. This provides a direct flash LED cathodeconnection to the ground plane that helps heat dissipation andsimplifies PCB routing.

The high-frequency, 2.75-MHz DC-DC boost switching frequencyallows the use of a small external inductor and output capacitor,which makes the SKY81294 ideally suited for small batterypoweredapplications. A start-up control circuit automaticallysenses the flash LED forward voltage at any programmed outputcurrent setting and determines the most efficient operation mode.

An industry standard I2C digital interface is used to program theSKY81294 LED Flash and Movie modes. Device operations arefully configurable, such as for movie and flash current level,current limits, and fault reporting. The SKY81294 has a separateflash enable input to initiate the flash operation and a flash inhibitinput either to reduce the flash current to Movie-mode levels or toshut off the flash current during high battery demand conditions.The flash inhibit mode can be programmed through the FLINHMbit set.

Fault status may be read using the I2C interface after the systemis alerted by an open-drain fault flag. Built-in circuitry preventsexcessive inrush current during start-up.

The SKY81294 is provided in small, 16-bump/9-bump,1.741 mm x 1.741 mm Wafer Level Chip Scale Packages(WLCSP).

特性 Features

• Input voltage range: 2.5 V to 5.5 V
• Up to 90% efficiency
• Soft-start and input current limit
• Programmable blinking LED notification
• Flash and Movie mode (MM) current
• Current read-back in input voltage monitor operation
• Fault read back

简介

SKY81294属于集成电路（IC）的LED驱动器。由Skyworks制造生产的SKY81294LED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。