-
2022-09-24 23:32:00
LTC1550 - Low Noise, Switched Capacitor Regulated Inverter
The LTC®1550/LTC1551 switched capacitor charge pump high voltage inverters include internal linear postregulators to minimize output ripple. Output Voltage - 4.1V fixed, typically less than 1mVP-P ripple voltage. The LTC1550 is also available in an adjustable output voltage version. The LTC1550/LTC1551 are ideal for use as GaAs transmitter field effect transistor bias voltage generators for portable RF and mobile phone applications. The LTC1550/LTC1551 operate from a single 4.5V to 6.5V supply and draw a typical quiescent current of 4.25mA from a 5V supply. Each device includes a TTL compatible shutdown pin that drops 0.2mA of supply current typically. The LTC1550 shutdown pin is active low (SHDN), while the LTC1551 shutdown pin is high (SHDN). Only 4 external components are required: input bypass capacitors, two 0.1mF charge pump capacitors and a filter linear regulator output capacitor. The adjustable LTC1550 requires two additional resistors to set the output voltage. “The LTC1550/LTC1551 provide up to 10mA output current on a 5V supply while maintaining guaranteed output regulation of ±5%. The fixed voltage LTC1550/LTC1551 are available in S0-8 plastic packages.