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LTC1444IN Datasheet(PDF) 9 Page - Linear Technology |
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LTC1444IN Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1443/LTC1444/LTC1445 Level Detector The LTC1444 is ideal for use as a multisupply micropower level detector as shown in Figure 5. R1 and R2 form a voltage divider from V1 to the noninverting comparator A input. R6 and R7 are used to divide down V2, while R8 is the output pull-up resistor for the comparator outputs. R3 and R4 set the hysteresis voltage and R5 and C1 bypass the reference output. The following design procedure can be used to select the component values: 1. Choose the V1 voltage trip level, in this example 4.65V. 2. Calculate the required resistive divider ratio. Ratio = VREF/VIN Ratio = 1.221V/4.65V = 0.263 3. Choose the required hysteresis voltage band at the input, VHBIN, in this example 60mV. Calculate the hysteresis voltage band referred to the comparator input VHB. VHB = (VHBIN)(Ratio) VHB = (60mV)(0.263) VHB = 15.78mV 4. Choose the values for R3 and R4 to set the hysteresis. R4 = 2.4M R3(k Ω) = VHB = 15k 5. Choose the values for R1 and R2 to set the trip point. R1 = VREF/IBIAS = 1.221V/1µA ≈ 1.21M RR V V V RM V V mV RM IN REF HB 21 2 1 21 21 465 1 221 15 2 1 23 40 = () + − = () + − = . . . . Using the same equations, R6 and R7 are 1.82M and 1.21M respectfully to set the trip level at 3V for V2. IN A+ 5 OUT B OUT A V+ V– R3 15k, 1% R5 430 Ω 5% R4 2.4M 1% C1 1.0 µF IN A– HYST REF 4 14 8 IN B+ 7 IN B– 6 – + LTC1443/44/45 • F05 1/2LTC1444 3 9 2 1 R1 1.21M 1% R2 3.40M 1% V1 R7 1.21M 1% R6 1.82M 1% V2 R8 2M 1% 5V – + Figure 5. Glitch-Free Level Detector with Hysteresis APPLICATIO S I FOR ATIO |
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