PRODUCT SUMMARY SKY82896/97: Three-Channel/Two-Channel Boost LED Driver with I2C Interface Applications Description Smartphones The SKY82896 is a step-up, three-channel LED driver with an input voltage range of 2.5 V to 5.5 V. The SKY82897 is a two-channel version of the SKY82896. The wide input voltage and high-boost switching frequency allow for a small solution size. Advanced dimming features and minimal external components make this device suitable for LED backlight solutions in single-cell, Li-Ion battery-based applications. Tablets Portable media players 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 Backlight power reduction: Output efficiency up to 90% Shutdown current: < 1 A Ultra-high resolution dimming: 10-bit dimming I2C /analog-PWM/direct-PWM 100 Hz to 25 KHz APWM capability 100 Hz to 50 kHz DPWM capability Comprehensive system protection: Integrated and programmable over-voltage protection Open/short LED protection, over-temperature and boost over-current protection Display system optimization: Programmable fade-in/fade-out Adjustable compensation to optimize image quality PWM options do not require I2C control Separate inputs for APWM and DPWM dimming mixing for up to 20-bit dimming resolution Adjustable current limit for smallest inductor Ultra-small, low-profile WLCSP (16-bump, 1.956 mm 1.906 mm) package (MSL1, 260 ºC per JEDEC J-STD-020) An integrated boost converter provides a high-voltage output for driving up to 30 V. Three precision current sinks are programmable up to 30 mA per string. The 900 kHz switching frequency supports ultra-small, low-profile external components. The SKY82896/97 supports three different types of dimming: Direct Pulse Width Modulation (DPWM) dimming receives the input PWM control signal from the PWM pin and generates the PWM output. Frequency and the ON duty are controlled by the input control signal. Analog Pulse Width Modulation (APWM) dimming receives the input PWM control signal from the PWM pin and converts the ON 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 to 25 kHz, and the DPMW dimming input frequency ranges from 100 Hz to 50 kHz. The minimum output ON duty in DPWM dimming is limited by the minimum on-time (39 ns), which allows 10-bit resolution at 25 kHz DPWM frequency. The device includes over-temperature protection, programmable over-voltage protection, boost over-current protection, and open/short LED protection. The SKY82896/97 is available in a space-saving 1.956 mm 1.906 mm, 16-bump Wafer-Level Chip Scale (WLCSP) package. A typical application circuit is shown in Figure 1. TM Skyworks Green products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of GreenTM, document number SQ04–0074. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203461A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 10, 2015 1 PRODUCT SUMMARY • SKY82896/97: THREE-CHANNEL/TWO-CHANNEL BOOST LED DRIVER WITH I2C INTERFACE VOUT Up to 28 V VIN 2.5 to 5.5 V Backlight CIN 4.7 µF LX ROVP1 IN COUT 2.2 µF OVP SDA SCL EN SKY82896/97 APWM DPWM 2 I C Bus data input I2C Bus clock input External enable input Analog PWM dimming control input Direct PWM dimming control input COMP ROVP2 (Note) CS1 CS2 CS3 ISET RCOMP RISET CCOMP GND PGND Note: External OVP resistors are optional. Connect the OVP pin to VOUT when external OVP resistors are not used. Figure 1. SKY82896/97 Typical Application Circuit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 February 10, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 203461A t0588 PRODUCT SUMMARY • SKY82896/97: THREE-CHANNEL/TWO-CHANNEL BOOST LED DRIVER WITH I2C INTERFACE Ordering Information Model Name Manufacturing Part Number 2 Evaluation Board Part Number SKY82896-11: Three-Channel Boost LED Driver with I C Interface SKY82896-11-001 SKY82896-11-EVB SKY82896-12: Three-Channel Boost LED Driver for PWM Only Control SKY82896-12-001 SKY82896-12-EVB SKY82897-11: Two-Channel Boost LED Driver with I2C Interface SKY82897-11-001 SKY82897-11-EVB SKY82897-12: Two-Channel Boost LED Driver for PWM Only Control SKY82897-12-001 SKY82897-12-EVB Copyright © 2015 Skyworks Solutions, Inc. All Rights Reserved. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203461A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 10, 2015 3