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LT1585CT-3.38 Datasheet(PDF) 7 Page - Linear Technology |
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LT1585CT-3.38 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LT1584/LT1585/LT1587 APPLICATIONS INFORMATION General The LT1584/LT1585/LT1587 family of three-terminal regulators is easy to use and has all the protection features expected in high performance linear regulators. The de- vices are short-circuit protected, safe-area protected, and provide thermal shutdown to turn off the regulators should the junction temperature exceed about 150 °C. The LT1584/LT1585/LT1587 family includes adjustable and fixed voltage versions. These ICs are pin compatible with the LT1083/LT1084/ LT1085 family of linear regulators but offer lower dropout voltage and faster transient response. The trade-off for this improved performance is a 7V maximum supply voltage. Similar to the LT1083/LT1084/LT1085 family, the LT1584/ LT1585/LT1587 regulators require an output capacitor for stability. However, the improved frequency compensation permits the use of capacitors with much lower ESR while still maintaining stability. 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/ LT1587 family is specifically designed to meet the fast current load-step requirements of these microprocessors and saves total cost by needing less output capacitance in order to maintain regulation. Stability The circuit design in the LT1584/LT1585/LT1587 family requires the use of an output capacitor as part of the frequency compensation. For all operating conditions, the addition of a 22 µF solid tantalum or a 100µF aluminum electrolytic on the output ensures stability. Normally, the LT1584/LT1585/LT1587 can use smaller value capacitors. Many different types of capacitors are available and have widely varying characteristics. These capacitors differ in capacitor tolerance (sometimes ranging up to ±100%), equivalent series resistance, equivalent series inductance, and capacitance temperature coefficient. The LT1584/ LT1585/LT1587 frequency compensation optimizes fre- quency response with low ESR capacitors. In general, use capacitors with an ESR of less than 1 Ω. On the adjustable LT1584/LT1585/LT1587, bypassing the adjust terminal improves ripple rejection and transient response. Bypassing the adjust pin increases the required output capacitor value. The value of 22 µF tantalum or THERMAL LIMIT GND FOR FIXED VOLTAGE DEVICE VIN VOUT LT1584 • BD ADJ – + SI PLIFIED SCHE ATIC |
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