LT1587-1.5 Datasheet | Linear Technology

LT1587-1.5 Fixed 1.5V, 3A Low Dropout Fast Response GTL+ Regulator Features s s s s s DESCRIPTION The LT ®1587-1.5 is a low dropout 3-terminal regulator with a fixed 1.5V output voltage and 3A output current capability. The design is optimized for low voltage applications where transient response and minimum input voltage are critical. Similar to the LT1085, it has lower dropout and faster transient response. These improvements make it ideal for low voltage microprocessor applications, especially as the regulator in an Intel Pentium Pro processor GTL+ supply. Current limit is trimmed to ensure specified output current and controlled short-circuit current. On-chip thermal limiting provides protection against any bination of overload that creates excessive junction temperatures. The LT1587-1.5 is available in both the through-hole and surface mount versions of the industry standard 3-pin TO-220 power package. , LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation Fast Transient Response Guaranteed Dropout Voltage at Multiple Currents Load Regulation: 0.05% Typ Trimmed Current Limit On-Chip Thermal Limiting U APPLICATIONS s s s Intel Pentium® Pro Processor GTL+ Supply Low Voltage Logic Supplies Battery-Powered Circuitry TYPICAL APPLICATION Intel Pentium Pro Processor GTL+ Supply 3.3V LT1587-1.5 VIN VOUT GND VTT = 1.5V 3A C4 TO C6 1µF R1 75Ω R2 150Ω R5 100Ω C13 0.1µF R7 100Ω R8 100Ω R6 100Ω VREF C14 0.1µF R3 75Ω R4 150Ω VTT = 1.5V 3A LT1587-1.5 VOUT VIN GND C10 TO C12 1µF C9 + C8, 100µF 10V AVX TPS 3.3V + C1 100µF 10V AVX TPS + C2, C3 100µF 10V AVX TPS VREF Q1 Q2 RX NOTE: LTC REMENDS SEPARATE VTT GENERATORS AT EACH BUS END TO ENSURE CURRENT SHARING BETWEEN THE REGULATORS AND TO MINIMIZE VTT DISTRIBUTION DROPS LT1587 - TA01 Q3 - - - Q4 142 TOTAL SIGNAL LINES + C7 100µF 10V AVX...