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Manufacturer: STMICROELECTRONICS
Order Code: 1202824
Manufacturer Part No: LD1117STR-E
Description: V REG ADJ +1.25/15V, SMD, 1117
Supplier: http://nl.farnell.com/stmicroelectronics/ld1117str-e/v-reg-adj-1-25-15v-smd-1117/dp/1202824
Datasheet: http://www.st.com/stonline/products/literature/ds/2572/ld1117xx.pdf
Datasheet: http://www.st.com/stonline/books/pdf/docs/2572.pdf
Catalogue Page: 545 / EBU
Price: € 1,32
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page 28 of datasheet
Case Style: SOT-223
SOT-223
SOT23 & SOT223 Packages (Example: SOT230P700X180-4)
SOT + Pitch P + Lead Span Nominal X Height - Pin Qty
SOT230P530X700-4__ST_LD1117SXX_SOT223
footprint looks ok, bit oversized pads, checked the part on printed paper
i recommend a new footprint for this device
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;VOUT = VREF (1 + R2 / R1)
;
;VREF = 1.25V
;
;# notes
;
;The power dissipated by the device will be equal to:
; IOUT(MAX)(VIN(MAX) – VOUT) + IGND(VIN(MAX))
;where,
; IOUT(MAX) = 250mA
; VIN(MAX) = 6V
; IGND at (IOUT = 250mA, VIN = 6V) = 5mA
;So,
; P = 250mA(6V – 3.3V) + 5mA(6V) = 0.71W
;
;page 7: Thermal resistance junction-case: 14 C/W
;
;
;=== 3.0 V ====
;
;R1 = 220
;R2 = 330
;
;VOUT = VREF (1 + R2 / R1)
;3.000 = 1.25 * (1 + 280 / 200)
;2.969 = 1.25 * (1 + 330 / 240)
;3.125 = 1.25 * (1 + 330 / 220)
;
;( (VOUT / VREF) -1 ) = (R2 / R1)
;
;I = U / R
;3 / 200 = 0.015
;
;P = I * U
;
;0.015 * 3 = 0.045 W
;0603 Case Size = 0.063 W
;
;
;=== 3.3 V ===
;
;R1 = 240
;R2 = 390
;
;VOUT = VREF (1 + R2 / R1)
;3.281 = 1.25 * (1 + 390 / 240)
;
;== +3.0V Limits ==
;
;VOUT = VREF (1 + R2 / R1)
;R1 = 240
;R2 = 330
;R1 = 99% = 237.6
;R1 = 101% = 242.4
;R2 = 99% = 326.7
;R2 = 101% = 333.3
;
;MIN(2.940) = 1.238 * (1 + 326.7 / 237.6)
;TYP(2.969) = 1.250 * (1 + 330.0 / 240.0)
;MAX(3.004) = 1.262 * (1 + 333.3 / 242.4)
;
;== +3.125 V Limits ==
;
;VOUT = VREF (1 + R2 / R1)
;R1 = 220
;R2 = 330
;R1 = 99% = 217.8
;R1 = 101% = 222.2
;R2 = 99% = 326.7
;R2 = 101% = 333.3
;
;MIN(3.095) = 1.238 * (1 + 326.7 / 217.8)
;TYP(3.125) = 1.250 * (1 + 330.0 / 220.0)
;MAX(3.115) = 1.262 * (1 + 333.3 / 222.2)
;
;3.125 = 1.25 * (1 + 330 / 220)
;
;
;== +3.3V Limits ==
;
;VOUT = VREF (1 + R2 / R1)
;R1 = 240
;R2 = 390
;R1 = 99% = 237.6
;R1 = 101% = 242.4
;R2 = 99% = 386.1
;R2 = 101% = 393.9
;MIN(3.250) = 1.238 * (1 + 386.1 / 237.6)
;TYP(3.281) = 1.238 * (1 + 386.1 / 237.6)
;MAX(3.313) = 1.262 * (1 + 393.9 / 242.4)