SSLD Drives up to 60 LEDs
Exhibiting True Color PWM Dimming with a dimming ratio of up to 3,000:1, Linear Technology’s LT3598 constant-current SSLD supplies power to up to 6 strings of LEDs with up to 10 30-mA white LEDs each. The 4 mm² QFN-packaged component demonstrates an input voltage range from 3.2 V to 30 V, an output voltage of up to 44 V, 1.5% LED current matching, and an adjustable frequency range from 200 kHz to 2.5 MHz. The DC/DC boost-mode converter regulates current if the input voltage is greater than the output voltage, disconnects LEDs in shutdown, and synchronizes to an external clock. The device includes regulated programmable open LED protection, an OPENLED alert pin, programmable LED current derating based on junction temperature and/or LED temperature, parallel channels, the ability to combine multiple strings to drive up to 2 strings of 10 90-mA LEDs. Pricing starts at $2.95 in 1,000 quantities.