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LTC1551L Datasheet(PDF) 1 Page - Linear Technology |
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LTC1551L Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LTC1550L/LTC1551L Low Noise, Switched Capacitor Regulated Voltage Inverters The LTC ®1550L/LTC1551L are switched capacitor charge pump voltage inverters which include internal linear post- regulators to minimize output ripple. The LTC1550L fixed output voltage versions include – 4.1V, –2.5V and –2V with ripple voltages typically below 1mVP-P. The LTC1550L is also available in an adjustable output voltage version. The LTC1550L/LTC1551L are ideal for use as bias voltage generators for GaAs transmitter FETs in portable RF and cellular telephone applications. The LTC1550L/LTC1551L operate from single 2.7V to 5.5V supplies and draw typical quiescent currents of 3.5mA with a 5V supply. Each device includes a TTL compatible Shutdown pin which drops supply current to 0.2 µA typically. The LTC1550L Shutdown pin is active low (SHDN), while the LTC1551L 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 capacitor at the linear regulator output. The adjustable LTC1550L/LTC1551L require two additional re- sistors to set the output voltage. The LTC1550L/LTC1551L will supply up to 20mA (depending on VCC to VOUT range), while maintaining guaranteed output regulation of ±2.5%. Both fixed voltage and adjustable LTC1550L/LTC1551L are available in 8-lead MSOP and SO plastic packages: the adjustable LTC1550L is also available in a 16-pin SSOP with the REG pin. , LTC and LT are registered trademarks of Linear Technology Corporation. 5 µs/DIV 1550L/51L TA01a s Regulated Negative Voltage from a Single Positive Supply s Low Output Ripple: Less Than 1mVP-P Typ s High Charge Pump Frequency: 900kHz s Small Charge Pump Capacitors: 0.1 µF s Requires Only Four External Capacitors s Fixed – 4.1V, –2.5V, –2V or Adjustable Output s Shutdown Mode Drops Supply Current to <1 µA s High Output Current: Up to 20mA (Depending on VCC to VOUT Range) s Output Regulation: 2.5% Over Line, Load and Temperature s Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP s GaAs FET Bias Generators s Negative Supply Generators s Battery-Powered Systems s Single Supply Applications VOUT AC COUPLED 2mV/DIV VOUT Output Noise and Ripple Figure 1. – 2V Generator with 1mVP-P Noise 1 2 3.6V 8 7 REG CPOUT SHDN VCC C1+ VOUT LTC1550L-2 GND C1– COUT 10 µF 1550L/51L TA01 VOUT = –2V ILOAD = 5mA CCP 0.1 µF R1 10k POWER VALID C1 0.1 µF 2.2 µF CIN 3 4 6 5 CL 0.1 µF + APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO |
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