Description
Features
Backlight LED Driver
- Wide input range: 2.7V~5.5V
- High efficiency step-up LED driver with 4-Ch current sinks, up to 32V boost voltage.
- Up to 30mA/Ch 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
- 0.2% to 100% duty cycle at 20kHz
- Programmable current sink turn on/off ramp time/shape and transition ramp up/down time
- Selectable boost switching frequency 1.0MHz or 500kHz 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
LCD Panel Bias
- Wide input range: 2.7V~5.5V
- Programmable dual output Bias regulator using a single inductor
- Programmable ramp time for OUTP and OUTN
- Charge pump PFM mode at light load
- LCD Bias efficiency: up to 85%
- Wide dual output voltage range ±4.0V to ±6.3V (50mV/step) and output current up to 120mA
- Active output discharge function
- Current limitation and short protection
Others
- System level input UVLO
- Thermal shutdown protection
- Low shutdown current <1µA
- Flexible I2C interface
- Pb-free Packages: WLCSP-24
- -40°C to +85°C Temperature Range
Applications
- Smartphone/Tablet Backlight
Key Electrical Specifications
| Vin(Min) | Vin(Max) | Number of LEDs/Channel | Channels | Control Type | Package |
| 2.7V | 5.5V | 8 | 4 | I2C | WLCSP-241.72 x 2.45mm |
Typical Application Diagram
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