LT1944

` Low Quiescent Current:
    20A in Active Mode
    <1A 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

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

V_IN, SHDN1, SHDN2 Voltage ........................................ 15V
SW1, SW2 Voltage ...................................................... 36V
FB1, FB2 Voltage ...........................................................V_IN
Current into FB1, FB2 Pins ........................................... 1mA
Junction Temperature ............................................. 125°C
Operating Temperature Range (Note 2) .. 40°C to 85°C
Storage Temperature Range ................. 65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................... 300°C

The LT^®1944 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 20mA at no load, which further reduces to 0.5A 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 costly 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.