LT1944-1

U U FEATURES s Low Quiescent Current: 20µA in Active Mode <1µA in Shutdown Mode s Operates with VIN as Low as 1.2V s Low VCESAT Switches: 85mV at 70mA s Uses Small Surface Mount Components s High Output Voltage: Up to 34V s Tiny 10-Pin MSOP Package U APPLICATIO S s Small TFT LCD Panels s Handheld Computers s Battery Backup s Digital Cameras LT1944-1 Dual Micropower Step-Up DC/DC Converter DESCRIPTIO The LT®1944-1 is a dual micropower step-up DC/DC converter in a 10-pin MSOP package. One converter is designed with a 100mA current limit and a 400ns off-time; the other with a 175mA current limit and a 1.5µs off-time. The 1.5µs off-time converter is ideal for generating an output voltage that is close to the input voltage (i.e. a LiIon to 5V converter, or a two-cell to 3.3V converter). With an input voltage range of 1.2V to 15V, the LT1944-1 is 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 offtime control scheme conserves operating current, resulting in high efficiency over a broad range of load current. Tiny, low profile inductors and capacitors can be used to minimize footprint and cost in space-conscious portable applications. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Triple Output Power Supply (5V, 15V, –10V) for LCD Displays VIN 2.7V TO 4.2V C1 4.7µF L1 22µH D1 8 VIN 4 SHDN2 6 4.7pF SW...