Micropower Inverting DC/DC Converters in SOT-23

The LT1617/LT1617-1 are micropower inverting DC/DC converters in a 5-lead SOT-23 package. The LT1617 is designed for higher power systems with a 350mA current limit and an input voltage range of 1.2V to 15V, whereas the LT1617-1 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 off-time 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 without the use of costly transformers. The LT1617’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.

Applications

* LCD Bias

* Handheld Computers

* Battery Backup

* Digital Cameras

* Low Quiescent Current:

* 20µA in Active Mode

* <1µA in Shutdown Mode

* Operates with VIN as Low as 1V

* Low VCESAT Switch: 250mV at 300mA

* Uses Small Surface Mount Components

* High Output Voltage: Up to –34V

* Tiny 5-Lead SOT-23 Package