SKY82896数据手册Skyworks中文资料规格书

描述 Description

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

The SKY82896 is a step-up, three-channel LED driver with aninput voltage range of 2.5 V to 5.5 V. The SKY82897 is atwo-channel version of the SKY82896. The wide input voltage andhigh-boost switching frequency allow for a small solution size.Advanced dimming features and minimal external componentsmake this device suitable for LED backlight solutions in single-cell,Li-Ion battery-based applications.

An integrated boost converter provides a high-voltage output fordriving up to 30 V. Three precision current sinks areprogrammable up to 30 mA per string. The 900 kHz switchingfrequency supports ultra-small, low-profile external components.

The SKY82896/97 supports three different types of dimming:Direct Pulse Width Modulation (DPWM) dimming receives theinput PWM control signal from the PWM pin and generatesthe PWM output. Frequency and the ON duty are controlledby the input control signal.Analog Pulse Width Modulation (APWM) dimming receives theinput PWM control signal from the PWM pin and converts theON duty of the input signal to an LED current control signal.I2C dimming adjusts the LED current through the I2C interface.The APWM dimming input frequency ranges from 100 Hz to25 kHz, and the DPMW dimming input frequency ranges from100 Hz to 50 kHz. The minimum output ON duty in DPWMdimming is limited by the minimum on-time (39 ns), which allows10-bit resolution at 25 kHz DPWM frequency.

The device includes over-temperature protection, programmableover-voltage protection, boost over-current protection, andopen/short LED protection.

The SKY82896/97 is available in a space-saving1.956 mm x 1.906 mm, 16-bump Wafer-Level Chip Scale(WLCSP) package.

特性 Features

• Input voltage range: 2.5 V to 5.5 V
• Three channels with up to 9 LEDs in series (up to 27 LEDs)
• 30 mA max LED current
• ±±2% current accuracy and ±2% matching