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RT5021 데이터시트(PDF) 32 Page - Richtek Technology Corporation

부품명 RT5021
상세설명  Channels DC/DC PMU with Li-ion Battery Charger
PDF  67 Pages
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제조업체  RICHTEK [Richtek Technology Corporation]
홈페이지  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT5021 데이터시트(HTML) 32 Page - Richtek Technology Corporation

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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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