LP8556 Overview
The LP8556 device is a white-LED driver featuring an asynchronous boost converter and six high precision current sinks that can be controlled by a PWM signal or an I2C master. The boost converter uses adaptive output voltage control for setting the optimal LED driver voltages as low as 7 V and as high as 43.
LP8556 Key Features
- 1 High-efficiency DC/DC boost converter with integrated 0.19-Ω power MOSFET and three switching frequency options: 312 k
- 2.7-V to 36-V Boost switch input voltage range supports multi-cell Li-Ion batteries (2.7-V to 20-V VDD input range)
- 7-V to 43-V Boost switch output voltage range supports as few as 3 WLEDs in series per channel and as many as 12
- Configurable channel count (1 to 6)
- Up to 50 mA per channel
- PWM and / or I2C brightness control
- Phase-shift PWM mode reduces audible noise
- Adaptive dimming for higher LED drive optical efficiency
- Programmable edge-rate control and spread spectrum scheme minimize switching noise and improve EMI performance
- LED fault (short and open) detection, UVLO, TSD, OCP, and OVP (up to 6 threshold options)