ST's STP4CMP is a charge pump-based four-way LED driver designed for RGB illumination or LCD display backlighting. Supports forward voltage high to achieve 3.8V LED , working voltage 2.7V~5.5V, four currents can be programmed separately, maximum current 30mA, output current accuracy ±7%, current matching between channels is within ±4%. Mainly used in mobile phone display backlights and RGB LED indicator drivers.
The STP4CMP is a charge pump based on a 4-channel LED driver for RGB illumination or liquid crystal display backlighting. The STP4CMP is battery powered and has an input voltage range of 2.7V to 5.5V. The device generates a regulated current sink with high channel-to-channel accuracy for up to 4 LEDs. It supports up to 3.8V LED forward voltage, and the current sink for each channel can be set by 4 independent external resistors. Each channel is independently controlled. PWM control can be used directly on the 4 EN (switch) pin to provide brightness control. When enabled, the charge pump (small ceramic bucket capacitor between C1P and C1N) starts operating and controls VOUT with the clamp voltage.
Figure 1 STP4CMP block diagram
Figure 2 STP4CMP application block diagram
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