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2022-09-24 23:32:00
LTC1682 - Charge Pump for Frequency Doubler Low Noise Linear Regulator
Low noise, low dropout (LDO) linear regulators inside the LTC®1682/LTC1682-3.3/LTC1682-5x charge pump. These components are designed to provide a low noise boost to the supply voltage for powering noise sensitive equipment such as high frequency VCO's for wireless applications. An internal multiplying charge pump converts a 1.8V to 4.4V input into a boost output, while an internal LDO regulator boosts the voltage into a low noise regulated output. The adjustable version allows the user to set the connection to FB via an external VOUT resistor. The regulator is capable of delivering up to 50mA of output current. Shutdown reduces supply current to <5mA, removes the load from VIN to disable the regulator and discharges VOUT to ground through a 100W switch. The LDO regulator of the LTC1682 is stable only at the 2MF output. Small ceramic capacitors can be used to reduce PC board area. The LTC1682/LTC1682-3.3/LTC1682-5 are short-circuit overtemperature protected. part in 8-pin MSOP and SO packages.