LTC1928-5

LTC1928-5 Doubler Charge Pump with Low Noise Linear Regulator in ThinSOT FEATURES s s s s s s s s s s s DESCRIPTIO U APPLICATIO S s s s s s s s s Low Output Noise: 90µVRMS (100kHz BW) Fixed Output Voltage: 5V Input Voltage Range: 2.7V to 4.4V No Inductors Required Uses Small Ceramic Capacitors Output Current Up to 30mA 550kHz Switching Frequency Low Operating Current: 190µA Low Shutdown Current: 4µA Internal Thermal Shutdown and Current Limiting Low Profile (1mm) ThinSOTTM Package The LTC®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. 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 < 8µA, removes the load from VIN by disabling the regulator and discharges VOUT to ground through a 200Ω switch. The LTC1928-5 LDO regulator is stable with only 2µF on the output. Small ceramic capacitors can be used, reducing PC board area. The LTC1928-5 is short-circuit and overtemperature protected. The part is available in a 6-pin low profile (1mm)ThinSOT package. , LTC and LT are registered trademarks of Linear Technology Corporation ThinSOT is a trademark of L...