The A6261/A6262/A6264 constant-current LED drivers offer four channels of up to 100-mA LED current each, and can be paralleled for higher currents. They operate with a low dropout voltage to minimize power dissipation, and do not require any ballast resistors. They also feature a unique current foldback circuit, which uses the chip junction temperature in order to fold back the LED current and to protect the IC and LEDs (if mounted in proximity and on the same substrate).
The user-selected current is provided to four outputs with each output equally sharing the load. The parts also feature short-to-ground protection, which disables the shorted channel and allows the others to continue to operate. Open LED on any channel is also detected. The A6261/62/64 devices are offered in the eMSOP-10 (LY) and eTSSOP-16 (LP) packages. (From $0.90 ea/1,000 — available now.)
Allegro MicroSystems , Worcester , MA
Stephanie Fennelly 508-854-5363
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