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LTC1550LIGN Datasheet(PDF) 7 Page - Linear Technology |
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LTC1550LIGN Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1550L/LTC1551L BLOCK DIAGRAM – + – + S2 S3 S1 S4 CCP VCC CPOUT C1+ C1– C1 CLK 900kHz CHARGE PUMP LINEAR REGULATOR 1550L/51L BD VOUT ADJ REG COUT 58mV 1.167V *SHDN *SHDN FOR LTC1550L, SHDN FOR LTC1551L ** FIXED OUTPUT VERSIONS ONLY COMP2 ** ** + 1.225V APPLICATIONS INFORMATION OVERVIEW The LTC1550L/LTC1551L are switched capacitor, inverting charge pumps with internal linear post-regulators. The LTC1550L/LTC1551L provide a regulated, low ripple output at up to 20mA load current with the appropriate input voltage as output load current depends on the input/ output voltage combination. Consult the graph provided in the Typical Performance Characteristics section and the Electrical Characteristics table for guaranteed test points. The LTC1550L/LTC1551L are ideal for use as bias voltage generators for GaAs transmitter FETs in portable RF and cellular telephone applications. The LTC1550L features an active-low Shutdown pin (SHDN) that drops quiescent current to below 1 µA. The LTC1551L is identical to the LTC1550L, except that the Shutdown pin is active-high (SHDN). All members of the LTC1550L/LTC1551L family feature a 900kHz charge pump frequency. The LTC1550L/ LTC1551L come standard with fixed – 4.1V, –2.5V, –2V and adjustable output voltages. The LTC1550L/LTC1551L can be configured for other fixed output voltages; contact Linear Technology for more information. |
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