1FEATURES
2• High-Voltage DC/DC Boost Converter with
Integrated FET with Four Switching Frequency
Options: 156/312/625/1250 kHz
• 2.7V to 22V Input Voltage Range to Support
1x…5x Cell Li-Ion Batteries
• Programmable PWM Resolution
– 8 to 13 True Bit (Steady State)
– Additional 1 to 3 Bits Using Dithering
During Brightness Changes
• I2C and PWM Brightness Control
• Automatic PWM & Current Dimming for
Improved Efficiency
• PWM Output Frequency and LED Current Set
Through Resistors
• Optional Synchronization to Display VSYNC
Signal
• 4 LED Outputs with LED Fault (Short/Open)
Detection
• Low Input Voltage, Over-Temperature, Over-
Current Detection and Shutdown
• Minimum Number of External Components
• DSBGA 25-Bump Package, 2.466 x 2.466 x
0.6 mm

APPLICATIONS
• Notebook and Netbook LCD Display LED
Backlight
• LED Lighting

DESCRIPTION
The LP8553 is a white LED driver with integrated
boost converter. It has four adjustable current sinks which can be controlled by PWM input or with I2C-
compatible serial interface.
The boost converter has adaptive output-voltage control based on the LED driver voltages. This
feature minimizes the power consumption by
adjusting the voltage to lowest sufficient level in all
conditions.
LED outputs have 8-bit current resolution and up to
13-bit PWM resolution with additional 1-3 bit dithering
to achieve smooth and precise brightness control.
Proprietary Phase Shift PWM control is used for LED outputs to reduce peak current from the boost
converter, thus making the boost capacitors smaller.
The Phase Shifting scheme also eliminates audible
noise.