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LTC2921IGN Datasheet(PDF) 16 Page - Linear Technology |
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LTC2921IGN Datasheet(HTML) 16 Page - Linear Technology |
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16 / 20 page  LTC2921/LTC2922 Series 16 29212fa APPLICATIO S I FOR ATIO Selecting RB1 = 243k satisfies the range restrictions be- low: Rk VV VA k k Rk VV V V B MAX B MIN 1 1 49 9 10 01 10 01 3 0525 0 505 0 505 0 1 49 9 244 3 49 9 10 01 10 01 3 5475 0 250 0 665 0 665 0 1 () () .• –. . • .– . .. • . . .• . –. • .. – . .– . = + +µ = = + + µµ = Ak k •. . 49 9 241 6 Similar calculations for the 2.5V supply yield suitable standard 1% values of RA2 = 49.9k and RB2 = 169k. R V A kk Rk VV VA k k Rk V A B MAX B MIN 2 2 2 0 500 10 50 49 9 49 9 10 01 10 01 2 3125 0 505 0 505 0 1 49 9 173 3 49 9 10 01 10 01 2 6875 = µ =≈ = + +µ = = + . . .• –. . • .– . .. • . . .• . –. • . () () ++ µ = 0 150 0 665 0 665 0 1 49 9 167 6 .– . .– . • . . VV VA k k Tie the unused V3 and V4 monitor pins to V2 for proper operation. 2921/22 F12 RX0 100 Ω RG0 10 Ω LTC2921 VCC SENSE RX1 100 Ω RX2 100 Ω R2 4.7k RA2 49.9k 1% RA1 49.9k 1% RB2 169k 1% RB1 243k 1% VOUT VFB VOUT VFB VOUT VFB RG1 10 Ω RG2 10 Ω V1 V2 V3 V4 S1 S2 S3 GATE PG D1 D2 D3 GND TIMER QRST Si1012R CBRST 5V = 7.5% 3.3V = 7.5% 2.5V = 7.5% Q0 Si2316DS Q1 Si2316DS Q2 Si2316DS RSENSE WSL1206 0.05 Ω, 1% CTIMER 0.22 µF 10V 5V LOAD 0.8A MAX 3.3V LOAD 1.6A MAX 2.5V LOAD 0.4A MAX RESET CGATE 0.47 µF 25V CD0 0.1 µF 25V CD1 0.1 µF 25V CD2 0.1 µF 25V CBYP 10 µF 25V DC/DC CONVERTER DC/DC CONVERTER DC/DC CONVERTER R1 100k CIRCUIT BREAKER RESET CONTROL 15 14 13 12 10 8 6 16 11 1 2 3 4 9 7 5 Figure 12. Design Example of a Three-Supply Tracker and Monitor (5V, 3.3V, 2.5V) |
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