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SC604AIMLTR Datasheet(PDF) 1 Page - Semtech Corporation |
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SC604AIMLTR Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 18 page  1 United States Patents: 6,504,422, 6,794,926 www.semtech.com POWER MANAGEMENT OBJECTIVE -NOVEMBER 9, 2000 SC604A Low Noise, High Efficiency Regulated White LED Driver Features June 27, 2005 Description Applications Typical Application Circuit The SC604A is a very high efficiency charge pump white LED driver driver from the mAhXLifeTM family of products, optimized for Li-Ion battery applications. The four (4) LED outputs are current matched for consis- tent LED brightness. Extremely low battery current is achieved by automatically reconfiguring the charge pump to match circuit conditions. Using four LEDs, each at 20mA for a total I OUT= 80mA, the SC604A can use less than 83mA from the supply for most of the battery life. Patented low noise mode switching circuitry and constant output current allow the use of extremely small input and output capacitors. Very high efficiency over 90% of battery life Peak efficiency over 92% Current regulation for up to 4 LEDs Digital 3 bit output control logic Current matching tolerance of ±3% typical Wide current range per LED [0.5mA - 30mA] High available total LED current = 4 I LED = 120mA Low Shutdown Current: 1µA typical Soft start / In-rush current limiting Short circuit protection MLP-16 [4x4] Package Fixed frequency 250kHz 1x, 1.5x and 2x charge pump modes of operation Cellular phones LED backlighting PDA power supplies Portable devices Electronic books Wireless web appliances LCD Modules Patent Pending VIN EN CTRL0 CTRL1 BATTERY 1 µF CTRL2 GND ILED1 ILED2 ILED3 ILED4 VOUT C1+ C1- C2+ C2- SC604A 1 µF 1 µF 1 µF ISET |
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