基于LT1615的微功率升压直流/直流转换器

LT1615 字库IC

DESCRIPTIO

The LT® 1615/LT1615-1 are micropower step-up DC/DC converters in a 5-lead SOT-23 package. The LT1615 is designed for higher power systems with a 350mA current limit and an input voltage range of 1.2V to 15V， whereas the LT1615-1 is intended for lower power and single-cell applications with a 100mA current limit and an extended input voltage range of 1V to 15V. Otherwise， the two devices are functionally equivalent. Both devices feature a quiescent current of only 20µA at no load， which further reduces to 0.5µA in shutdown. A current limited， fixed offtime control scheme conserves operating current， resulting in high efficiency over a broad range of load current. The 36V switch allows high voltage outputs up to 34V to be easily generated in a simple boost topology without the use of costly transformers. The LT1615’s low off-time of 400ns permits the use of tiny， low profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications.

FEATURES

■ Low Quiescent Current： 20µA in Active Mode 《1µA in Shutdown Mode ■ Operates with VIN as Low as 1V ■ Low VCESAT Switch： 250mV at 300mA ■ Tiny 5-Lead SOT-23 Package ■ Uses Small Surface Mount Components ■ High Output Voltage： Up to 34V

APPLICATIO

■ LCD Bias ■ Handheld Computers ■ Battery Backup ■ Digital Cameras