參數(shù)資料
型號(hào)： LTC3880EUJ-1#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
封裝： 6 X 6 MM, LEAD FREE, PLASTIC, WJJD-2, QFN-40
文件頁數(shù)： 57/112頁
文件大?。?/td> 2182K
代理商： LTC3880EUJ-1#PBF
LTC3880/LTC3880-1
49
3880fa
APPLICATIONS INFORMATION
Refer to Tables 12 and 13 to set the output voltage using
RCONFIG pins VOUTn_CFG and VTRIMn_CFG. RTOP is
connected between VDD25 and the pin and RBOTTOM is
connected between the pin and SGND. 1% resistors must
be used to assure proper operation.
The output voltage set point is equal to:
VSETPOINT = VOUTn_CFG + VTRIMn_CFG
Forexample,iftheVOUTn_CFGpinhasRTOPequalto24.9k
and RBOTTOM equal to 4.32k, and VTRIMn_CFG is set with
RTOP not inserted and RBOTTOM equal to0Ω:
VSETPOINT = 1.1V – 0.099V or 1.001V
If odd values of output voltage are required from 0.5V to
3.3V, use only the VOUTn_CFG resistor divider, the VTRIM
pin can be open or shorted to VDD25. If the output set
point is 5V, the VOUTn_CFG must have RTOP equal to 10k
and RBOTTOM equal to 23.2k and VTRIMn_CFG must have
RTOP equal to 20k and RBOTTOM equal to 11k.
Table 12. VOUTn_CFG
RTOP (kΩ)
RBOTTOM (kΩ)
VOUT (V)
0 or Open
Open
NVM
10
23.2
See VTRIM
10
15.8
3.3
16.2
20.5
3.1
16.2
17.4
2.9
20
17.8
2.7
20
15
2.5
20
12.7
2.3
20
11
2.1
24.9
11.3
1.9
24.9
9.09
1.7
24.9
7.32
1.5
24.9
5.76
1.3
24.9
4.32
1.1
30.1
3.57
0.9
30.1
1.96
0.7
Open
0
0.5
Table 13. VTRIMn_CFG
RTOP (kΩ)
RBOTTOM (kΩ)
VTRIM (mV)
CHANGE TO
VSET VOLTAGE
VOUT (V)
IF VOUT HAS
10kΩ/23.3kΩ
0 or Open
Open
0
NVM
10
23.2
99
NVM
10
15.8
86.625
NVM
16.2
20.5
74.25
NVM
16.2
17.4
61.875
NVM
20
17.8
49.5
NVM
20
15
37.125
5.5
20
12.7
24.75
5.25
20
11
12.375
5
24.9
11.3
–12.375
4.75
24.9
9.09
–24.75
4.5
24.9
7.32
–37.125
4.25
24.9
5.76
–49.5
4
24.9
4.32
–61.875
3.75
30.1
3.57
–74.25
3.63
30.1
1.96
–86.625
3.5
Open
0
–99
3.46
Frequency and Phase Selection Using RCONFIG
The frequency and phase commands are linked if they
are set using the RCONFIG pins. If PMBus commands
are used the two parameters are independent. The SYNC
pins must be shared in PolyPhase configurations where
multiple LTC3880s are used to produce the output. If the
configuration is not PolyPhase the SYNC pins do not
have to be shared. If the SYNC pins are shared between
LTC3880s only one SYNC pin can be set as a frequency
output, all other SYNC pins must be set to External Clock.
For example in a 4-phase configuration clocked at 425kHz,
one of the LTC3880s must be set to the desired frequency
and phase and the other LTC3880 must be set to External
Clock. All phasing is with respect to the falling edge of
SYNC.
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