DescriptionThe 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, DPAK/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 F 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/ATO-220Table 1.Device summaryPart numbersLD1117AXX12LD1117AXX33LD1117AXX18LD1117AXX LD1117AXX25ContentsLD1117Axx 2/29 Contents1Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 AFixed output voltage of: 1.2 V, 1.8 V, 2.5 V, 3.3 VAdjustable version availability (VREL = 1.25 V)Internal current and thermal limitOnly 10 F for stabilityAvailable in 2 % (at 25 C) and 4 % in full temperature rangeHigh supply voltage rejection:80 dB typ. (at 25 C)Temperature range: 0 C to 125 CDescriptionThe 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, DPAK/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 F minimum capacitor is needed for stability. Only chip trimming allows the regulat specifications are available at: www.st.com.LD