Dual Micropower Step-Up DC/DC Converter

The LT1944 is a dual micropower step-up 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 LT1944 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 in a simple boost topology without the use of costlt transformers. The LT1944'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.

Switch Current

LT1944

350mA, 350mA

LT1944-1

100mA, 175mA

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 1.2V