LP8557IAYFQR Datasheet PDF - TI

●The LP8557 and LP8557I are high-efficiency LED drivers each featuring an integrated DC-DC inductive boost converter and six high-precision current sinks. LP8557 is intended for applications that exclusively use a pulse width modulated (PWM) signal for controlling the brightness while LP8557I is intended for applications that can utilize an I2C master as well.

●The boost converter has adaptive output voltage control. This feature minimizes the power consumption by adjusting the voltage to the lowest sufficient level under all conditions.

●The adaptive current sink headroom voltage control scales the headroom voltage with the LED current for optimal system efficiency.

●The LED string auto-detect function enables use of the same device in systems with 1 to 6 LED strings for the maximum design flexibility.

●Proprietary hybrid PWM plus current mode dimming enables additional system power savings. Phase-shift PWM allows reduced audible noise and smaller boost output capacitors.

●Flexible CABC support combines brightness level selections based on the PWM input and I2C commands.