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LT1585A Datasheet(PDF) 1 Page - Linear Technology |
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LT1585A Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1585A/LT1585A-3.3 5A Low Dropout Fast Response Positive Regulators Adjustable and Fixed The LT ®1585A/LT1585A-3.3 are low dropout 3-terminal regulators with 5A output current capability. Design has been optimized for low voltage applications where tran- sient response and minimum input voltage are critical. Similar to the LT1084 family, these regulators feature lower dropout voltage and faster transient response. These improvements make them ideal for low voltage microprocessor applications requiring a regulated 2.5V to 3.6V output with an input supply below 7V. Current limit is trimmed to ensure specified output current and controlled short-circuit current. On-chip thermal lim- iting provides protection against any combination of over- load that would create excessive junction temperatures. The LT1585A/LT1585A-3.3 are available in the industry standard 3-pin TO-220 power package. DESCRIPTION APPLICATIONS s Fast Transient Response s Guaranteed Dropout Voltage at Multiple Currents s Load Regulation: 0.05% Typ s Trimmed Current Limit s On-Chip Thermal Limiting s Standard 3-Pin Power Package FEATURES s Pentium ® Processor Supplies s PowerPC TM Supplies s Other 2.5V to 3.6V Microprocessor Supplies s Low Voltage Logic Supplies s Battery-Powered Circuitry s Post Regulator for Switching Supply LT1585ACT Adjustable LT1585ACT-3.3 3.3V Fixed , LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation. TYPICAL APPLICATION NOTE: MICROPROCESSOR APPLICATIONS WITH LOAD TRANSIENTS OF 3.8A REQUIRE OUTPUT DECOUPLING CAPACITANCE >1300 µF ON FIXED VOLTAGE PARTS TO ACHIEVE < 50mV OF DEVIATION FROM NOMINAL OUTPUT. CONSULT FACTORY FOR DETAILS Dropout Voltage vs Output Current 3.3V, 5A Regulator LT1585A-3.3 VIN ≥ 4.75V 1585A TA01 C1 10 µF * REQUIRED FOR STABILITY 3.3V 5A + C2* 10 µF + OUTPUT CURRENT (A) 0 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 LT1585A TA02 IFULL LOAD |
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