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LD1117S12TR Datasheet(PDF) 1 Page - STMicroelectronics |
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LD1117S12TR Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 42 page March 2010 Doc ID 2572 Rev 28 1/42 42 LD1117xx Adjustable and fixed low drop positive voltage regulator Features ■ Low dropout voltage (1 V typ.) ■ 2.85 V device performances are suitable for SCSI-2 active termination ■ Output current up to 800 mA ■ Fixed output voltage of: 1.2 V, 1.8 V, 2.5 V, 3.0 V, 3.3 V, 5.0 V ■ Adjustable version availability (Vref = 1.25 V) ■ Internal current and thermal limit ■ Available in ± 1% (at 25 °C) and 2% in full temperature range ■ Supply voltage rejection: 75 dB (typ.) Description The LD1117 is a low drop voltage regulator able to provide up to 800 mA of output current, available even in adjustable version (VREF = 1.25 V). Concerning fixed versions, are offered the following output voltages: 1.2 V, 1.8 V, 2.5 V, 2.85 V, 3.0 V, 3.3 V and 5.0 V. The 2.85 V type is ideal for SCSI-2 lines active termination. The device is supplied in: SOT-223, DPAK, SO-8 and TO-220. The SOT-223 and DPAK surface mount packages optimize the thermal characteristics even offering a relevant space saving effect. High efficiency is assured by NPN pass transistor. In fact in this case, unlike than PNP one, the quiescent current flows mostly into the load. Only a very common 10 µF minimum capacitor is needed for stability. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 1% at 25°C. The adjustable LD1117 is pin to pin compatible with the other standard. Adjustable voltage regulators maintaining the better performances in terms of drop and tolerance. DPAK SO-8 TO-220 SOT-223 Table 1. Device summary Part numbers LD1117XX12 LD1117XX25C LD1117XX50C LD1117XX12C LD1117XX30 LD1117XX LD1117XX18 LD1117XX33 LD1117XXC LD1117XX18C LD1117XX33C LD1117XX25 LD1117XX50 www.st.com |
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