Datasheet Linear Technology LT1945 — 数据表

LT1945
Dual Micropower DC/DC
Converter with Positive and
Negative Outputs
FEATURES DESCRIPTION n The LT®1945 is a dual micropower 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 LT1945 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
without the use of costly transformers. The LT1945’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. n n Generates Well-Regulated Positive and
Negative Outputs
Low Quiescent Current:
20μA in Active Mode (per Converter) 1V
VFB2 < 0.6V 400
1.5 Switch VCESAT ISW = 300mA 250 350 mV 350 400 mA Switch Current Limit 250 1945fa 2 LT1945
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating …