Datasheet LT1585A, LT1585A-3.3 (Analog Devices)

LT1585A/LT1585A-3.3 5A Low Dropout Fast Response Positive Regulators Adjustable and Fixed
U FEATURES DESCRIPTIO
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Fast Transient Response
The LT®1585A/LT1585A-3.3 are low dropout 3-terminal ■
Guaranteed Dropout Voltage at Multiple Currents
regulators with 5A output current capability. Design has ■ Load Regulation: 0.05% Typ been optimized for low voltage applications where tran- ■ Trimmed Current Limit sient response and minimum input voltage are critical. ■ On-Chip Thermal Limiting Similar to the LT1084 family, these regulators feature ■ Standard 3-Pin TO-220 Power Package lower dropout voltage and faster transient response. These improvements make them ideal for low voltage
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microprocessor applications requiring a regulated 2.5V to
APPLICATIO S
3.6V output with an input supply below 7V. ■ Pentium® Processor Supplies Current limit is trimmed to ensure specified output current ■ PowerPCTM Supplies and controlled short-circuit current. On-chip thermal lim- ■ Other 2.5V to 3.6V Microprocessor Supplies iting provides protection against any combination of over- ■ Low Voltage Logic Supplies load that would create excessive junction temperatures. ■ Battery-Powered Circuitry ■ Post Regulator for Switching Supply The LT1585A/LT1585A-3.3 are available in the industry standard 3-pin TO-220 power package. LT1585ACT Adjustable , LTC and LT are registered trademarks of Linear Technology Corporation. LT1585ACT-3.3 3.3V Fixed Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
U TYPICAL APPLICATIO 3.3V, 5A Regulator Dropout Voltage vs Output Current
1.5 3.3V 1.4 V LT1585A-3.3 IN ≥ 4.75V 5A + + 1.3 C1 C2* 10µF 100µF 1.2 1.1 1585A TA01 1.0 * REQUIRED FOR STABILITY 0.9 NOTE: MICROPROCESSOR APPLICATIONS WITH LOAD TRANSIENTS OF 3.8A REQUIRE 0.8 OUTPUT DECOUPLING CAPACITANCE >1300µF ON FIXED VOLTAGE PARTS TO ACHIEVE < 50mV OF DEVIATION FROM NOMINAL OUTPUT. CONSULT FACTORY FOR DETAILS 0.7 INPUT/OUTPUT DIFFERENTIAL (V) 0.6 0.5 0 IFULL LOAD OUTPUT CURRENT (A) LT1585A TA02 1585afa 1