Current sink LED backlighting enables high-quality display illumination
The SC667 and SC668 current sink drivers with on-chip digital lighting effects are presented as reducing the total parts count and extending battery life compared to boost converters or charge pumps. They also claim far superior illumination quality than conventional current sink drivers. This new platform incorporates Semtech’s patent-pending smart Automatic Dropout Prevention (ADP) technology to enable a new generation of high-quality current sink drivers that can replace boost converters and charge pumps in high-end handhelds, while providing high-quality display backlighting.
Prior to the ADP approach, current sinks were not optimal for high-end handheld devices. This was because line transients caused by the heavy system loads produced display flicker when these loads were enabled and disabled. Semtech’s smart ADP topology eliminates this problem via automatic and simultaneous monitoring of each current sink to avoid dropout as the system loads turn on and off.
The SC668 provides eight current sinks, while the SC667 features seven current sinks plus an interrupt request indicator signal to tell the host processor when an ambient-light threshold has been crossed. Additional features include an I2C programming interface (fast and standard modes), ±0.5% typ LED current matching, and ±1.5% typ LED current accuracy. (Ea/3,000: SC667, $1.15; SC668, $1.29 — available now.)
Semtech , Camarillo , CA
Sales 805-498-2111
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