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參數(shù)資料
| 型號： | LTC1708-PG |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual Adjustable 5-Bit VID High Efficiency, 2-Phase Current Mode Synchronous Buck Regulator Controller |
| 中文描述： | 可調(diào)式雙5位VID高效率，2相電流模式同步降壓穩(wěn)壓控制器 |
| 文件頁數(shù)： | 19/32頁 |
| 文件大?。?/td> | 358K |
| 代理商： | LTC1708-PG |
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19
LTC1708-PG
Output Voltage Programming
The LTC1708 output voltages are set by the VID logic
inputs for the first controller and by an external feedback
resistive divider carefully placed across the output capaci-
tor for the second controller. The resultant feedback signal
is compared with the internal precision 0.800V voltage
reference by the error amplifier. The output voltage is
given by the equation:
1
The output voltage of the first controller is digitally set to
levels between 0.925V and 2.00V using the voltage iden-
tification (VID) inputs VID0 to VID4. The internal 5-bit DAC
configured as a precision resistive voltage divider sets the
output voltage in 50mV or 25mV increments according to
Table 1.
The VID codes (00000-11110) are engineered to be com-
patible with Intel Mobile Pentium
II
and Pentium III
processor specifications for output voltages from 0.925V
to 2.00V.
The LSB (VID0) represents 50mV increments in the upper
voltage range (1.30V to 2.00V) and 25mV increments in
the lower voltage range (0.925V to 1.275V). The MSB is
VID4. When all bits are low, or grounded, the output
voltage is 2.00V.
Between the ATTNOUT
pin and ground is a variable resis-
tor, R1, whose value is controlled by the five input pins (VID0
to VID4). Another resistor, R2, between the ATTNIN and
the ATTNOUT pins completes the resistive divider. The
output voltage is thus set by the ratio of (R1 + R2) to R1.
The LTC1708 has remote sense capability. The top of the
internal resistive divider is connected to ATTNIN, and it is
referenced to the SGND pin. This allows a Kelvin connec-
tion for remotely sensing the output voltage directly across
the load, eliminating any PC board trace resistance errors.
Each VID digital input is pulled up by a 40k resistor in
series with a diode from VIDV
CC
. Therefore, it must be
grounded to get a digital low input, and can be either
floated or connected to VIDV
CC
to get a digital high input.
The series diode is used to prevent the digital inputs from
V
V
R
R
OUT
=
+
0 8
.
1
2
being damaged or clamped if they are driven higher than
VIDV
CC
. The digital inputs accept CMOS voltage levels.
VIDV
CC
is the supply voltage for the VID section. It is
normally connected to INTV
CC
but can be driven from
other sources such as a 3.3V supply. If it is driven from
another source, that source MUST be in the range of 2.7V
to 5.5V and MUST be alive prior to enabling the LTC1708.
Table 1. VID Output Voltage Programming
VID4
VID3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
VID2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
VID1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
VID0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
V
OUT
(V)
2.000V
1.950V
1.900V
1.850V
1.800V
1.750V
1.700V
1.650V
1.600V
1.550V
1.500V
1.450V
1.400V
1.350V
1.300V
*
1.275V
1.250V
1.225V
1.200V
1.175V
1.150V
1.125V
1.100V
1.075V
1.050V
1.025V
1.000V
0.975V
0.950V
0.925V
**
Note: *, ** represent codes without a defined output voltage as specified in
Intel specifications. The LTC1708 interprets these codes as valid inputs and
produces output voltages as follows: [01111] = 1.250V, [11111] = 0.900V.
APPLICATIU
W
U
U
Pentium is a registered trademark of Intel Corporation.
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