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LDS8680 Datasheet(PDF) 1 Page - IXYS Corporation |
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LDS8680 Datasheet(HTML) 1 Page - IXYS Corporation |
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1 / 12 page  LDS8680 © 2009 IXYS Corp. 1 Doc. No. 8681_DS, Rev. N1.0 Characteristics subject to change without notice 800 mA White LED Driver for Photo Flash FEATURES o 1-x and 2-x Charge pump modes o Low dropout PowerLite ™ Current Regulator* o Drives up to 2 LEDs at 400 mA simultaneously or one LED at 800 mA o Smart OneWire ™ LED current programming and PWM mode LED current control o Power efficiency up to 90% o Low current shutdown mode < 1 µA o Short circuit current limiting o Thermal shutdown protection o Timeout to protect LED at high currents o 8-pin 2 x 3 x 0.8 mm TDFN package APPLICATION o Photo flash plus red eyes reduction o White LED photoflash for cell phones and still cameras DESCRIPTION The LDS8680 is a high efficiency charge pump with low dropout voltage that can drive two LEDs at 400 mA each simultaneously or one LED at 800 mA per channel. Inclusion of a low dropout PowerLite ™ Current Regulator (PCR) increases device’s efficiency up to 90%. The EN/SET logic input functions as a chip enable and a current setting interface. The LEDs current is programmable by Smart OneWire ™ digital interface in 32 steps from 52 to 800 mA for LEDA channel or in 16 steps from 52 to 400 mA for LEDB channel. Every LED may be turned on/off or programmed separately Low noise input ripple is achieved by operating at a constant switching frequency, which allows the use of small external ceramic capacitors. The charge pump supports a range of input voltages from 2.7 V to 5.5 V. The device is available in 8-lead TDFN 2 mm x 3 mm package with a max height of 0.8 mm. TYPICAL APPLICATION CIRCUIT |
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