LT1944
Dual Micropower Step-Up
DC/DC Converter U FEATURES
■ ■
■
■
■
■ DESCRIPTIO 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 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
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. Low Quiescent Current:
20µA in Active Mode 1V
VFB < 0.6V 400
1.5 Switch VCESAT ISW = 300mA 250 350 mV 350 400 mA 2
8 3 …