The Exar SP6887 is a 4-channel regulated charge pump white LED driver designed to drive up to four LEDs connected in parallel. It operates in 1x mode or 1.5x fractional mode and can switch automatically from 1x to 1.5x mode when the input voltage decreases. The device includes four current sink regulators for LED current matching and brightness uniformity.
The SP6887 supports LED currents up to 30mA over an input supply range of 2.7V to 5.5V. It has a fixed 1MHz switching frequency, an enable input for shutdown mode, and LED dimming methods that include setting the RSET pin current, using a switched resistor in parallel with RSET, or applying a PWM signal to a CTRx pin or the EN pin.
| LED driver type | 4-channel charge pump white LED driver |
|---|---|
| Output current per LED | Up to 30mA |
| Input voltage range | 2.7V to 5.5V |
| Switching frequency | 1MHz |
| Peak efficiency | 90% |
| Current matching tolerance | 3% max |
| Operating modes | 1x and 1.5x fractional mode |
| Package | Pb-Free Thin QFN-16 3mmx3mm |
| Ambient temperature range | -40°C to +85°C |
The SP6887 is a 4-channel charge pump white LED driver capable of driving up to 4 LEDs connected in parallel.
The LED current can be programmed by an external resistor connected between the RSET pin and ground.
It supports LED currents up to 30mA over an input supply voltage range of 2.7V to 5.5V.
The document lists four methods: RSET only, analog reference VSET, PWM input at CTRO, and PWM input at EN.