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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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RT5021 Fiches technique(PDF) 32 Page - Richtek Technology Corporation |
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RT5021 Fiches technique(HTML) 32 Page - Richtek Technology Corporation |
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32 / 67 page  RT5021 32 DS5021-01 April 2013 www.richtek.com Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. © CH3 to CH4 : Step-Down Synchronous DC/ DC Converter The step-down synchronous DC/ DC converters include internal power MOSFETs and compensation network. It support PFM or Sync-PWM mode by setting I2C. These channels supply the power for core and DRAM. They can be operated at 100% maximum duty cycle to extend battery operating voltage range. When the input voltage is close to the output voltage, the converter enters low dropout mode with low output ripple. The FB voltage of CH3 and CH4 can be adjusted by the I2C interface in the range of 0.72V to 0.86V. FB3 regulation voltage can be selected by I 2 C interface. The default voltage is 0.8V. Code VREF If Target = 1.8V If Target = 1V If Target = 3.3V 000 0.72V 1.62V 0.9V 2.97V 001 0.74V 1.665V 0.925V 3.0525V 010 0.76V 1.71V 0.95V 3.135V 011 0.78V 1.755V 0.975V 3.2175V 100 0.8V 1.8V 1V 3.3V 101 0.82V 1.845V 1.025V 3.3825V 110 0.84V 1.89V 1.05V 3.465V FB3 [2:0] 111 0.86V 1.935V 1.075V 3.5475V FB4 regulation voltage can be selected by I 2 C interface. The default voltage is 0.8V. Code VREF If Target = 1.8V If Target = 1V If Target = 3.3V 000 0.72V 1.62V 0.9V 2.97V 001 0.74V 1.665V 0.925V 3.0525V 010 0.76V 1.71V 0.95V 3.135V 011 0.78V 1.755V 0.975V 3.2175V 100 0.8V 1.8V 1V 3.3V 101 0.82V 1.845V 1.025V 3.3825V 110 0.84V 1.89V 1.05V 3.465V FB4 [2:0] 111 0.86V 1.935V 1.075V 3.5475V If CH3/CH4 input voltage (PVD3/PVD45) is higher than 4.2V and the output voltage is lower than 1.5V, a feed forward capacitor can be added improve the transient response. The capacitance can be estimated by the following equation. For example, when R1 is 470k Ω, the available feed-forward capacitor is 33pF. VOUT R1 R2 Cff FB − × 6 ff 15.5 10 C = R1 |
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