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LD1117AXX12 Datasheet(PDF) 1 Page - STMicroelectronics |
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LD1117AXX12 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 29 page April 2008 Rev 20 1/29 29 LD1117Axx Low drop fixed and adjustable positive voltage regulators Features ■ Low dropout voltage (1.15 V typ. @ IOUT = 1 A, 25 °C) ■ Very low quiescent current (5 mA typ. @ 25 °C) ■ Output current up to 1 A ■ Fixed output voltage of: 1.2 V, 1.8 V, 2.5 V, 3.3 V ■ Adjustable version availability (VREL = 1.25 V) ■ 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: – 80 dB 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 1 A 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 and 3.3 V. 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 10 µF 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 Table 1. Device summary Part numbers LD1117AXX12 LD1117AXX33 LD1117AXX18 LD1117AXX LD1117AXX25 www.st.com |
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