Kinetic Technologies KTZ8864 4-Channel LED Backlight Driver
Kinetic Technologies KTZ8864 4-Channel LED Backlight Driver is a multifunction Power Management IC (PMIC) that combines a 4-channel, high-efficiency step-up LED backlight driver with a dual output LCD bias power regulator into a compact, space-saving small package. Kinetic KTZ8864 integrates a step-up converter for LED backlighting, a step-up converter with LDO, and an inverting charge pump for LCD bias power. This results in a simpler and smaller solution with fewer external components. The high switching frequency of the KTZ8864 allows the use of a smaller inductor and capacitor. The input operating range of this device is from 2.7V to 5.5V, making it ideal for mobile, battery-powered applications.
The LED driver offers four regulated current sinks that can regulate up to 30mA, with a maximum boost output voltage of up to 32V. 11-bit linear or exponential ILED resolution can be obtained over I2C or Pulse Width Modulation (PWM) dimming. For additional flexibility, PWM dimming offers a wide range frequency and duty cycle to support Content Adaptive Brightness Control (CABC).
The LCD bias power section includes a step-up converter, LDO Regulator, and an inverting charge pump to generate dual outputs, OUTP and OUTN, whose voltages can be programmed via an I2C interface. By integrating synchronous rectification MOSFETs for the step-up converter and charge pump, the KTZ8864 maximizes conversion efficiency up to 85%.
The KTZ8864 includes a wide range of protection features, including inductor current limit protection, output short circuit protection, output overvoltage protection, LED fault (open or short) protection, and thermal shutdown protection.
The KTZ8864 is offered in a RoHS compliant 24-ball Wafer Level Chip Scale Package (WLCSP).
Features
- 4-channel backlight LED driver
- High-efficiency step-pp LED driver with 4-channel current sinks, up to 32V boost voltage
- Up to 30mA/channel in backlight mode
- ±0.7% current matching at 20mA
- ±2.2% current accuracy at 20mA
- I2C/PWM dual dimming control scheme
- High-resolution I2C 11-bit linear or exponential dimming
- Wide range PWM dimming
- 100Hz to 100kHz frequency
- 2% to 100% duty cycle at 20kHz
- Programmable current sink turn on/off ramp time/shape and transition ramp up/down time
- 1.0mHz or 500kHz selectable boost switching frequency with auto-frequency mode supported
- Programmable input PWM hysteresis to minimize jitter at low PWM duty cycle
- Programmable OVP and current limitation
- LED open/short protection
- High-efficiency step-pp LED driver with 4-channel current sinks, up to 32V boost voltage
- LCD panel bias
- Programmable dual output bias regulator using a single inductor
- Programmable ramp time for OUTP and OUTN
- Charge pump PFM mode at light load
- Up To 85% LCD bias efficiency
- ±4.0V to ±6.3V (50mv/step) dual output voltage range
- Up to 120mA output current
- Active output discharge function
- Current limitation and short protection
- 2.7V to 5.5V input voltage range
- System level input UVLO
- Thermal shutdown protection
- <1μA low shutdown current
- Flexible I2C interface
- WLCSP-24 package
- 1.72mm x 2.45mm x 0.62mm dimensions
- Lead-free and RoHS compliant
Applications
- Small- to medium-sized backlit LCD panels
- Smartphone and tablet displays
Typical Application Circuit
Package Outline
