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LD1117ADT12TR Folha de dados(PDF) 1 Page - STMicroelectronics |
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LD1117ADT12TR Folha de dados(HTML) 1 Page - STMicroelectronics |
1 / 27 page January 2007 Rev. 17 1/27 27 LD1117A series Low drop fixed and adjustable positive voltage regulators Features ■ Low dropout voltage (1.15V typ. @ IOUT = 1A, 25°C) ■ Very low quiescent current (5 mA typ. @ 25°C) ■ Output current up to 1A ■ Fixed output voltage of: 1.2V, 1.8V, 2.5V, 2.85V, 3.3V, 5.0V ■ Adjustable version availability (Vrel = 1.25V) ■ Internal current and thermal limit ■ Only 10 µF for stability ■ Available in ± 2% (at 25°C) and 4% in full temperature range ■ High supply voltage rejection: – 80dB typ. at 25°C) ■ Temperature range: 0°C to 125°C Description The LD1117A is a LOW DROP Voltage Regulator able to provide up to 1A of Output Current, available even in adjustable version (Vref=1.25V). Concerning fixed versions, are offered the following Output Voltages: 1.2V, 1.8V, 2.5V, 2.85V, 3.3V and 5.0V. The 2.85V type is ideal for SCSI-2 lines active termination. The device is supplied in: SOT-223, DPAK, D2PAK/A and TO-220. Surface mount packages optimize the thermal characteristics even offering a relevant space saving effect. High efficiency is assured by NPN pass transistor. Only a very common 10µF minimum capacitor is needed for stability. Only chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 2% at 25°C. SOT-223 D2PAK/A TO-220 DPAK www.st.com Block diagram |
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