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LT1117CM-3.3 Datasheet(PDF) 5 Page - Linear Technology |
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LT1117CM-3.3 Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page 5 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 I DAGRA BLOCK APPLICATI HI TS The LT1117 family of three-terminal regulators are easy to use. They are protected against short circuit and thermal overloads. Thermal protection circuitry will shutdown the regulator should the junction temperature exceed 165 °C at the sense point. These regulators are pin compatible with older three-terminal adjustable regulators, offer lower dropout voltage and more precise reference toler- ance. Reference stability over temperature is improved over older types of regulators. Stability The LT1117 family of regulators requires an output ca- pacitor as part of the device frequency compensation. A minimum of 10 µF of tantalum or 50µF of aluminum electrolytic is required. The ESR of the output capacitor should be less than 0.5 Ω. Surface mount tantalum capaci- tors, which have very low ESR, are available from several manufacturers. When using the LT1117 adjustable device the adjust terminal can be bypassed to improve ripple rejection. When the adjust terminal is bypassed the required value of the output capacitor increases. The device will require an output capacitor of 22 µF tantalum or 150µF aluminum electrolytic when the adjust pin is bypassed. Normally, capacitor values on the order of 100 µF are used in the output of many regulators to ensure good load transient response with large load current changes. Out- put capacitance can be increased without limit and larger values of output capacitance further improve stability and transient response. Protection Diodes In normal operation, the LT1117 family does not need any protection diodes. Older adjustable regulators required protection diodes between the adjust pin and the output and between the output and input to prevent over stress- ing the die. The internal current paths on the LT1117 adjust pin are limited by internal resistors. Therefore, even with capacitors on the adjust pin, no protection diode is needed to ensure device safety under short circuit conditions. The LT1117 • BD01 – + THERMAL LIMIT OUT IN ADJ GND FOR FIXED VOLTAGE DEVICE |
Similar Part No. - LT1117CM-3.3 |
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Similar Description - LT1117CM-3.3 |
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