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LTC1550 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1550 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LTC1550/LTC1551 Low Noise, Switched Capacitor Regulated Voltage Inverters FEATURES s Regulated Negative Voltage from a Single Positive Supply s Low Output Ripple: Less Than 1mVP-P Typ s High Charge Pump Frequency: 900kHz Typ s Small Charge Pump Capacitors: 0.1 µF s Requires Only Four External Capacitors s Fixed – 4.1V or Adjustable Output s Shutdown Mode Drops Supply Current to < 1 µA s High Output Current: Up to 10mA, VCC = 5V s Output Regulation: 5% s Available in SO-8 and 16-Lead SSOP s GaAs FET Bias Generators s Negative Supply Generators s Battery-Powered Systems s Single Supply Applications APPLICATIONS DESCRIPTION The LTC ®1550/LTC1551 are switched capacitor charge pump voltage inverters which include internal linear post- regulators 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. The LTC1550/LTC1551 operate from single 4.5V to 6.5V supplies and draw typical quiescent currents of 4.25mA with a 5V supply. Each device includes a TTL compatible Shutdown pin which drops supply current to 0.2 µA typi- cally. The LTC1550 Shutdown pin is active low (SHDN), while the LTC1551 Shutdown pin is active high (SHDN). Only four external components are required: an input bypass capacitor, two 0.1 µF charge pump capacitors and a filter capacitoratthelinearregulatoroutput.TheadjustableLTC1550 requires two additional resistors to set the output voltage. The LTC1550/LTC1551 will supply up to 10mA output current with a 5V supply, while maintaining guaranteed output regulation of ±5%. The fixed voltage LTC1550/LTC1551 are available in S0-8 plastic packages. The adjustable LTC1550 is available in a 16-pin SSOP. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION VOUT Output Noise and Ripple 10 µs/DIV 1550/51 TA02 VOUT AC COUPLED 2mV/DIV – 4.1V Generator with 1mVP-P Noise 1 2 VCC 8 7 SENSE CPOUT SHDN VCC C1+ VOUT LTC1551 FERRITE BEAD GND C1– COUT 10 µF 1550/51 F01 VOUT = –4.1V ILOAD = 5mA CCP 0.1 µF C1 0.1 µF 4.7 µF CIN 3 4 6 5 CL 0.1 µF + |
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