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LTC3883 Datasheet(PDF) 4 Page - Linear Technology |
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LTC3883 Datasheet(HTML) 4 Page - Linear Technology |
4 / 20 page LTC3870-1 4 38701f For more information www.linear.com/LTC3870-1 Typical perForMance characTerisTics Load Step (Discontinuous Conduction Mode) 4-Phase Operation LTC3887-1 and LTC3870-1 Load Step (Forced Continuous Mode) 4-Phase Operation LTC3887-1 and LTC3870-1 Inductor Current at Light Load Efficiency vs Load Current Efficiency vs Load Current Full Load (ILOAD = 20A/Phase) Efficiency and Power Loss vs Input Voltage VIN = 12V VOUT = 1.8V L = 0.56µH DCR = 1.61mΩ fSW = 350kHz CCM DCM LOAD CURRENT (A) 0.1 1 10 100 10 25 40 55 70 85 100 3874 G01 VIN = 12V VOUT = 3.3V fSW = 350kHz L = 1µH DCR = 2.4mΩ CCM DCM LOAD CURRENT (A) 0.1 1 10 100 10 20 30 40 50 60 70 80 90 100 38701 G02 VOUT = 1.8V L = 0.56µH DCR = 1.61mΩ EFFICIENCY POWER LOSS INPUT VOLTAGE (V) 5 6 7 8 9 10 11 11 12 13 14 15 16 91.0 91.5 92.0 92.5 93.0 93.5 2.5 2.6 2.7 2.8 2.9 3.0 38701 G03 VIN = 12V VOUT = 1.0V 50µs/DIV ILOAD 50A/DIV 0A TO 20A TO 0A VOUT 50mV/DIV AC–COUPLED INDUCTOR CURRENT LTC3887–1 (CH0) 10A/DIV INDUCTOR CURRENT LTC3870–1 (CH0) 10A/DIV 38701 G04 VIN = 12V VOUT = 1.0V 50µs/DIV ILOAD 50A/DIV 0A TO 20A TO 0A VOUT 50mV/DIV AC–COUPLED INDUCTOR CURRENT LTC3887–1 (CH0) 10A/DIV INDUCTOR CURRENT LTC3870–1 (CH0) 10A/DIV 38701 G05 1µs/DIV IL LTC3870–1 (CH1) FORCED CONTINUOUS MODE 5A/DIV IL LTC3870–1 (CH1) DISCONTINUOUS MODE 5A/DIV 38701 G06 |
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