LTC1550/LTC1551
Low Noise, Switched
Capacitor Regulated
Voltage Inverters U DESCRIPTION FEATURES The LTCВ®1550/LTC1551 are switched capacitor charge
pump voltage inverters which include internal linear postregulators to minimize output ripple. Output voltages are
fixed at – 4.1V, with ripple voltages typically below 1mVP-P.
The LTC1550 is also available in an adjustable output
voltage version. The LTC1550/LTC1551 are ideal for use
as bias voltage generators for GaAs transmitter FETs in
portable RF and cellular telephone applications. Regulated Negative Voltage from a Single
Positive Supply
Low Output Ripple: Less Than 1mVP-P Typ
High Charge Pump Frequency: 900kHz Typ
Small Charge Pump Capacitors: 0.1ВµF
Requires Only Four External Capacitors
Fixed – 4.1V or Adjustable Output
Shutdown Mode Drops Supply Current to < 1ВµA
High Output Current: Up to 10mA, VCC = 5V
Output Regulation: 5%
Available in SO-8 and 16-Lead SSOP в– в–
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