參數(shù)資料
型號： MAX1718EEI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning IMVP-II
中文描述： SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO28
封裝： 0.150 INCH, 0.025 INCH PITCH, MO-137AD, QSOP-28
文件頁數(shù)： 22/35頁
文件大?。?/td> 700K
代理商： MAX1718EEI
M
Notebook CPU Step-Down Controller for Intel
Mobile Voltage Positioning (IMVP-II)
22
______________________________________________________________________________________
At the beginning of an output voltage transition, the
MAX1718 blanks the VGATE output, preventing it from
going low. VGATE remains blanked during the transi-
tion and is re-enabled when the slew-rate controller has
set the internal DAC to the final value and one addition-
al slew-rate clock period has passed. The slew-rate
clock frequency (set by resistor R
TIME
) must be set fast
enough to ensure that the longest required transition is
completed within the allowed 100μs.
The output voltage transition is performed in 25mV
steps, preceded by a delay and followed by one addi-
tional clock period. The total time for a transition
depends on R
TIME
, the voltage difference, and the
accuracy of the MAX1718
’
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 MAX1718 will automati-
cally control the current to the minimum level required
to complete the transition in the calculated time, as long
as the surge current is less than the current limit set by
ILIM. The transition time is given by:
where f
SLEW
= 150kHz
120k
/ R
TIME
, V
OLD
is the
original DAC setting, V
NEW
is the new DAC setting, and
T
DELAY
ranges from zero to a maximum of 2/f
SLEW
. See
Time Frequency Accuracy in the
Electrical Charac-
teristics
table for f
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
the transitions relatively smooth. The average inductor
current required to make an output voltage transition is:
I
L
C
OUT
25mV
f
SLEW
Output Overvoltage Protection
The overvoltage protection (OVP) circuit is designed to
protect the CPU against a shorted high-side MOSFET
by drawing high current and blowing the battery fuse.
The output voltage is continuously monitored for over-
≤
×
mV
+
1
25
f
V
V
T
SLEW
OLD
NEW
DELAY
MAX1718
D4
D3
D2
D1
D0
ZMODE
*
TO REDUCE QUIESCENT CURRENT, 1k
PULLUP RESISTORS CAN BE REPLACED BY 1M
RESISTORS WITH 4.7nF CAPACATORS IN PARALLEL.
ZMODE HIGH
VID = 01010
→
1.25V
CPU VID =
01100
→
1.15V
(ZMODE LOW)
1k
1M
1k
1k
1k
1k
4.7nF
*OPTIONAL
3.15V TO 5.5V
100k
100k
CPU
ZMODE = HIGH = 1.25V
ZMODE = LOW = 1.15V
Figure 13. Using the Internal Mux with CPU Driving the Logic-Mode VID Code
相關(guān)PDF資料
PDF描述
MAX1718 Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP -40 to 85
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1718EEI+ 制造商:Maxim Integrated Products 功能描述:LDO CNTRLR STDN 0.6V TO 1.75V 28QSOP - Rail/Tube
MAX1718EEI+T 制造商:Maxim Integrated Products 功能描述:LDO CNTRLR STDN 0.6V TO 1.75V 28QSOP - Tape and Reel
MAX1718EEI-C71059 制造商:Maxim Integrated Products 功能描述:NOTEBOOK CPU STEP-DOWN CONTROLLER FOR INTEL M - Rail/Tube
MAX1718EEI-T 制造商:Maxim Integrated Products 功能描述:NOTEBOOK CPU STEP-DOWN CONTROLLER FOR INTEL M - Tape and Reel
MAX1718EEI-TG068 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
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