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DN1014同步降压型控制器在汽车应用中的电池寿命延长
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2012-01-16
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Battery powered applications that have a signifi cantamount of time in standby mode, require electrical circuitsto operate with a low quiescent current to preserve batterylife. The LTC3835 synchronous step-down controlleris an excellent solution with its ultralow quiescent current(80μA). Other features make it uniquely qualifi ed tosatisfy the needs of automotive applications. A wide 4Vto 36V input voltage range protects the supply againsthigh input voltage transients and is compatible with lowvoltage cold crank conditions. The constant frequencycurrent-mode architecture with high-side inductor current
sensing provides excellent line and load regulationand reliable current limiting and sharing. The 0.8V to10V output voltage range provides fl exibility for a varietyof applications. Solution size is small due tothe 650kHzswitching frequency, which reduces external componentsizes, and the integrated synchronous FET driver, whichkeeps component count low. Furthermore, the LTC3835provides high effi ciency over a wide load range up to 20A.Other important features include:
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