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RT5016C データシート(PDF) 32 Page - Richtek Technology Corporation

部品番号 RT5016C
部品情報  I2C Programmable Multi-Channel PMU
PDF  68 Pages
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メーカー  RICHTEK [Richtek Technology Corporation]
ホームページ  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT5016C データシート(HTML) 32 Page - Richtek Technology Corporation

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RT5016C
32
DS5016C-02
November 2016
www.richtek.com
Copyright
2016 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 I
2C. 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 I
2C 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 to 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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