Features

• Low Quiescent Current:
  20µA in Active Mode
  <1µA in Shutdown Mode
• Operates with V_IN as Low as 1.2V
• Low V_CESAT Switches: 85mV at 70mA
• Uses Small Surface Mount Components
• High Output Voltage: Up to 34V
• Tiny 10-Pin MSOP Package

Typical Application

Description

The LT1944-1 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 Li-Ion 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 off-time 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.