Datasheet Linear Technology LTC1928-5 — 数据表

LTC1928-5
Doubler Charge Pump with
Low Noise Linear Regulator
in ThinSOT
FEATURES DESCRIPTION Low Output Noise: 90ВµVRMS (100kHz BW)
nn Fixed Output Voltage: 5V
nn Input Voltage Range: 2.7V to 4.4V
nn No Inductors Required
nn Uses Small Ceramic Capacitors
nn Output Current Up to 30mA
nn 550kHz Switching Frequency
nn Low Operating Current: 190ВµA
nn Low Shutdown Current: 4ВµA
nn Internal Thermal Shutdown and Current Limiting
nn Low Profile (1mm) ThinSOTв„ў Package The LTCВ®1928-5 is a doubler charge pump with an internal
low noise, low dropout (LDO) linear regulator. The part is
designed to provide a low noise boosted supply voltage for
powering noise sensitive devices such as high frequency
VCOs in wireless applications. nn An internal charge pump converts a 2.7V to 4.4V input to a
boosted output, while the internal LDO regulator converts
the boosted voltage to a low noise regulated output. The
regulator is capable of supplying up to 30mA of output
current. Shutdown reduces the supply current to 500ВµA, VIN = 2.7V to 4.4V l 480 550 620 kHz CPO Output Resistance VIN = 2.7V, IOUT = 10mA …