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LTM4644 Datasheet(PDF) 27 Page - Linear Technology |
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LTM4644 Datasheet(HTML) 27 Page - Linear Technology |
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27 / 36 page  LTM4650A-1 27 4650a1f For more information www.linear.com/LTM4650A-1 APPLICATIONS INFORMATION Table 6. Output Voltage Response vs Component Matrix (Refer to Figure 35) Load Step Typical Measured Values 2-Phase Single Output Solution CIN (CERAMIC) COUT (CERAMIC) COUT (BULK) VENDORS VALUE PART NUMBER VENDORS VALUE PART NUMBER VENDORS VALUE PART NUMBER MURATA 22μF, 16V, X5R, 1210 GRM32ER61C226KE20L MURATA 100μF, 6.3V, X5R, 1210 GRM32ER60J107ME20L Panasonic 470μF, 2.5V, 3mΩ EEFGX0E4TIR 1 MURATA 22μF, 16V, X5R, 1206 GRM31CR61C226KE15K MURATA 220μF, 4V, X5R, 1206 GRM31CR60G227M Panasonic 470μF, 6.3V, 10mΩ 6TPF470MAH 2 TDK 22μF, 16V, X5R, 1210 C3225X5R1C226M250AA Taiyo Yuden 100μF, 6.3V, X5R, 1210 JMK325BJ107MM-T Taiyo Yuden 220µF, 4V, X5R, 1210 AMK325ABJ227MM-T 25% Load Step (0A to 12.5A) Ceramic Output Capacitor Only Solutions VIN VOUT CIN 3 (BULK) CIN (CERAMIC) COUT (BULK) COUT (CERAMIC) COMP PIN RESISTOR (RTH) COMP PIN CAPACITOR (CTH) COMP PIN PARALLELING CAPACITOR (CTHP) FEED- FORWARD CAPACITOR (CFF) PEAK- PEAK DEVIATION (VPK-PK) SETTLING TIME (tSETTLE) LOAD STEP LOAD STEP SLEW RATE RFB (kΩ) FREQ 12V 1V 150µF 22µF × 4 None 220µF × 8 3.32kΩ 6800pF None 68pF 62mV 40µs 12.5A 10A/µs 90.9 300kHz 12V 1.2V 150µF 22µF × 4 None 220µF × 8 3.32kΩ 6800pF None 68pF 51mV 40µs 12.5A 10A/µs 60.4 400kHz 12V 1.5V 150µF 22µF × 4 None 220µF × 8 3.32kΩ 6800pF None 68pF 61mV 40µs 12.5A 10A/µs 40.2 400kHz 12V 1.8V 150µF 22µF × 4 None 220µF × 8 3.32kΩ 6800pF None 68pF 58mV 40µs 12.5A 10A/µs 30.2 500kHz 12V 2.5V 150µF 22µF × 4 None 220µF × 8 3.32kΩ 6800pF None 68pF 70mV 50µs 12.5A 10A/µs 19.1 500kHz 12V 3.3V 150µF 22µF × 4 None 220µF × 8 3.32kΩ 6800pF None 68pF 70mV 60µs 12.5A 10A/µs 13.3 600kHz 12V 5V Suggest to Use POSCAP + Ceramic Cap 25% Load Step (0A to 12.5A) Bulk + Ceramic Output Capacitor Solutions VIN VOUT CIN 3 (BULK) CIN (CERAMIC) COUT (BULK) COUT (CERAMIC) COMP PIN RESISTOR (RTH) COMP PIN CAPACITOR (CTH) COMP PIN PARALLELING CAPACITOR (CTHP) FEED- FORWARD CAPACITOR (CFF) PEAK- PEAK DEVIATION (VPK-PK) SETTLING TIME (tSETTLE) LOAD STEP LOAD STEP SLEW RATE RFB (kΩ) FREQ 12V 1V 150µF 22µF × 4 470µF × 2 1 100µF × 4 4.64kΩ 4700pF 10pF 68pF 54mV 30µs 12.5A 10A/µs 90.9 300kHz 12V 1.2V 150µF 22µF × 4 470µF × 2 1 100µF × 4 4.64kΩ 4700pF 10pF 68pF 50mV 30µs 12.5A 10A/µs 60.4 400kHz 12V 1.5V 150µF 22µF × 4 470µF × 2 1 100µF × 4 4.64kΩ 4700pF 10pF 68pF 57mV 30µs 12.5A 10A/µs 40.2 400kHz 12V 1.8V 150µF 22µF × 4 470µF × 2 1 100µF × 4 4.64kΩ 4700pF 10pF 68pF 57mV 40µs 12.5A 10A/µs 30.2 500kHz 12V 2.5V 150µF 22µF × 4 470µF × 2 1 100µF × 4 4.64kΩ 4700pF 10pF 68pF 72mV 50µs 12.5A 10A/µs 19.1 500kHz 12V 3.3V 150µF 22µF × 4 470µF × 2 2 100µF × 4 9.09kΩ 4700pF 10pF None 89mV 60µs 12.5A 10A/µs 13.3 600kHz 12V 5V 150µF 22µF × 4 470µF × 2 2 100µF × 4 9.09kΩ 4700pF 10pF None 90mV 60µs 12.5A 10A/µs 8.25 700kHZ Notes 1 and 2. Different Bulk COUT1 used. See Part Number in Table 6. Note 3. CIN (BULK) may be required with long PCB traces. |
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