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參數(shù)資料
| 型號： | MAX1717EEG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP |
| 中文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, MO-137AC, QSOP-24 |
| 文件頁數(shù)： | 22/32頁 |
| 文件大?。?/td> | 501K |
| 代理商： | MAX1717EEG |
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M
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
22
______________________________________________________________________________________
other ICs that operate in two or more modes with differ-
ent core voltage levels.
Intel’s mobile Pentium III CPU with SpeedStep technol-
ogy operates at two distinct clock frequencies and
requires two distinct core voltages. When transitioning
from one clock frequency to the other, the CPU first
goes into a low-power state, then the output voltage
and clock frequency are changed. The change must
be accomplished in 100μs or the system may halt.
At the beginning of an output voltage transition, the
MAX1717 brings the VGATE output low, indicating that
a transition is beginning. VGATE remains low during the
transition and goes high when the slew-rate controller
has set the internal DAC to the final value and one
additional slew-rate clock period has passed. The slew-
rate clock frequency (set by resistor R
TIME
) must be set
fast enough to ensure that VGATE goes high within the
allowed 100μs. Alternatively, the slew-rate clock can be
set faster than necessary and VGATE’s rising edge can
be detected so that normal system operation can
resume even earlier.
The output voltage transition is performed in 25mV
steps, preceded by a 4μs delay and followed by one
additional clock period after which VGATE goes high if
the output voltage is in regulation. The total time for a
transition depends on R
TIME
, the voltage difference,
and the accuracy of the MAX1717’s slew-rate clock,
and is not dependent on the total output capacitance.
The greater the output capacitance, the higher the
surge current required for the transition. The MAX1717
will automatically control the current to the minimum
level required to complete the transition in the calculat-
ed time, as long as the surge current is less than the
current limit set by ILIM. The transition time is given by:
where
SLEW
= 150kHz
·
120k
/ R
TIME
, V
OLD
is the
original output voltage, and V
NEW
is the new output volt-
age. See Time Frequency Accuracy in
Electrical Char-
acteristics
for
SLEW
accuracy.
The practical range of R
TIME
is 47k
to 470k
, corre-
sponding to 2.6μs to 26μs per 25mV step. Although the
DAC takes discrete 25mV steps, the output filter makes
≤ μ +
4
+
mV
1
1
25
s
V
V
SLEW
OLD
NEW
MAX1717
D4
D3
D2
D1
D0
A/B
A/B = LOW = 1.60V
A/B = HIGH = 1.35V
1k
1k
1k
1k
100k
2.7V TO 5.5V
NOTE:
USE PULL-UP FOR A-MODE 1, PULL-DOWN FOR A-MODE 0.
USE
≥
100k
FOR B-MODE 1,
≤
1k
FOR B-MODE 0.
Figure 9. Using the Internal Mux with Both VID Codes Resistor Programmed
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|---|---|
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| MAX1718BEEI | Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning IMVP-II |
| MAX1720EUTG | Switched Capacitor Voltage Inverter with Shutdown |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1717EEG+ | 功能描述:DC/DC 開關(guān)控制器 Adj Synchronous Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1717EEG+C71058 | 功能描述:DC/DC 開關(guān)控制器 Step-Down Controller for Notebook CPU RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1717EEG+T | 功能描述:DC/DC 開關(guān)控制器 Adj Synchronous Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1717EEG-C71058 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1717EEG-T | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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