LT1585 Linear Technology, LT1585 Datasheet
LT1585
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LT1585 Summary of contents
Page 1
... On-chip thermal lim- iting provides protection against any combination of over- load that would create excessive junction temperatures. The LT1585/LT1587 are available in both the through-hole and surface mount versions of the industry standard 3-pin Adjustable TO-220 power package. The LT1584 is available in the 3 ...
Page 2
... OUT 7V, 0mA OUT 6.6V, 0mA OUT 6.6V, 0mA OUT ORDER PART NUMBER OUT LT1584CT ADJ LT1585CT LT1587CT LT1584CT-3.3 LT1584CT-3. LT1585CT-3.3 LT1585CT-3.45 V OUT LT1587CT-3.3 LT1587CT-3.45 GND LT1584CT-3.38 LT1584CT-3.6 LT1585CT-3.38 LT1585CT-3.6 LT1587CT-3.6 MIN TYP MAX 25 C 1.225 (– 2%) 1 ...
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... OUT LT1584-3.6 V OUT Current Limit LT1584 (V – (Note 3) LT1584-3.3 (V – LT1584-3.38 (V – LT1584-3.45 (V – LT1584-3.6 (V – LT1585 (V – LT1585-3.3 (V – < LT1585-3.38 (V – LT1585-3.45 (V – LT1585-3.6 (V – LT1587 (V – ...
Page 4
... Note 2: Line and load regulation are guaranteed up to the maximum power dissipation (25W for the LT1584 in T package, 26.5W for the LT1585 in T package, 18W for the LT1587 in T package). Power dissipation is determined by input/output differential and the output current. Guaranteed maximum output power will not be available over the full input/output voltage range ...
Page 5
... TEMPERATURE ( C) LT1584/LT1585/LT1587 LT1584 Load Regulation vs Temperature 0. 0.05 0 –0.05 –0.10 –0.15 –0. –75 –50 – TEMPERATURE ( C) LT1585 Load Regulation vs Temperature 0. 4.6A 0.05 0 –0.05 –0.10 –0.15 –0.20 150 175 –75 –50 – TEMPERATURE ( C) LT1584 • TPC05 LT1587 Load Regulation vs Temperature 0 ...
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... TEMPERATURE ( C) LT1584 • TPC14 LT1585/7 Maximum Power Dissipation* 30 LT1585 25 20 LT1587 100 110 120 130 140 150 CASE TEMPERATURE (˚C) LT1584 • TPC17 *AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE LT1584/5/7-3 ...
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... This is critical in addressing the needs of modern, low voltage, high speed microprocessors. Current generation microprocessors cycle load current from almost zero to amps in tens of nanoseconds. Output voltage tolerances are tighter and include transient re- sponse as part of the specification. The LT1584/LT1585/ + – THERMAL LIMIT ...
Page 8
... Current limit oscillations are typically nonexistent, unless the input and output decoupling ca- pacitors for the regulators are mounted several inches from the terminals. The LT1584 differs from the LT1585/ LT1587 and provides current limit foldback as input-to- output differential voltage increases. This safe-area char- acteristic exhibits a negative impedance because increas- ing voltage causes output current to decrease ...
Page 9
... If this happens, two stable output operating points exist for the regulator. With this double intersection, the power supply may require cycling down to zero and back up again to make the output recover. This situation does not occur with the LT1585/LT1587 because no foldback circuitry is required to provide safe-area protection. Ripple Rejection V ...
Page 10
... IN *CONNECT R1 TO CASE Figure 5. Connection for Best Load Regulation Thermal Considerations The LT1584/LT1585/LT1587 family protects the device under overload conditions with internal power and thermal limiting circuitry. However, for normal continuous load conditions, do not exceed maximum junction temperature ratings important to consider all sources of thermal resistance from junction-to-ambient ...
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... Please consult “Mounting Considerations for Power Semiconductors” 1990 Linear Applications Handbook, Volume I , Pages RR3-1 to RR3-20. The output connects to the case of all devices in the LT1584/LT1585/LT1587 series. For example, using an LT1585CT-3.3 (TO-220, commer- cial) and assuming: V (Max Continuous) = 5.25V (5V + 5%), ...
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... LT1584/LT1585/LT1587 U TYPICAL APPLICATIONS Guaranteed LT1584/LT1431 Circuit for the Intel 90MHz and 100MHz Pentium Processors (Meets Intel Specifications with Worst-Case Tolerances) 5V SEE NOTE 5 NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTOR VALUES ARE OHMS 1/8W, 5% 220 F 2. ALL CAPACITORS ARE 50V, 20% 10V 3. ALL POLARIZED CAPACITORS ARE AVX ...