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
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
For all available packages, see the orderable addendum at the
end of the data sheet.
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