Dual Micropower DC/DC Converter with Positive and Negative Outputs

The LT1945 is a dual micropower DC/DC converter in a 10-pin MSOP package. Each converter is designed with a 350mA current limit and an input voltage range of 1.2V to 15V, making the LT1945 ideal for a wide variety of applications. Both converters 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 LT1945’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

* Small TFT LCD Panels

* Handheld Computers

* Battery Backup

* Digital Cameras

* Generates Well-Regulated Positive and Negative Outputs

* Low Quiescent Current:

* 20µA in Active Mode (per Converter)

* <1µA in Shutdown Mode

* Operates with VIN as Low as 1.2V

* Low VCESAT Switch: 250mV at 300mA

* Uses Small Surface Mount Components

* High Output Voltage: Up to ±34V

* Tiny 10-Pin MSOP Package