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參數(shù)資料
| 型號： | MAX1718 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP -40 to 85 |
| 中文描述： | 筆記本電腦CPU降壓型控制器，用于Intel移動電壓定位(IMVP-II) |
| 文件頁數(shù)： | 31/35頁 |
| 文件大?。?/td> | 700K |
| 代理商： | MAX1718 |
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M
Notebook CPU Step-Down Controller for Intel
Mobile Voltage Positioning (IMVP-II)
______________________________________________________________________________________
31
and careful consideration should go into the selection of
the final design.
The one-stage approach offers smaller total inductor
size and fewer capacitors overall due to the reduced
demands on the 5V supply. The transient response of
the single stage is better due to the ability to ramp up
the inductor current faster. The total efficiency of a sin-
gle stage is better than the two-stage approach.
The two-stage approach allows flexible placement due
to smaller circuit size and reduced local power dissipa-
tion. The power supply can be placed closer to the
CPU for better regulation and lower I
2
R losses from PC
board traces. Although the two-stage design has worse
transient response than the single stage, this can be
offset by the use of a voltage-positioned converter.
Ceramic Output Capacitor
Applications
Ceramic capacitors have advantages and disadvan-
tages. They have ultra-low ESR and are noncom-
bustible, relatively small, and nonpolarized. They are
also expensive and brittle, and their ultra-low ESR char-
acteristic can result in excessively high ESR zero fre-
quencies (affecting stability in nonvoltage-positioned
circuits). In addition, their relatively low capacitance
value can cause output overshoot when going abruptly
from full-load to no-load conditions, unless the inductor
value can be made small (high switching frequency), or
there are some bulk tantalum or electrolytic capacitors
in parallel to absorb the stored energy in the inductor.
In some cases, there may be no room for electrolytics,
creating a need for a DC-DC design that uses nothing
but ceramics.
The MAX1718 can take full advantage of the small size
and low ESR of ceramic output capacitors in a voltage-
positioned circuit. The addition of the positioning resistor
increases the ripple at FB, lowering the effective ESR
zero frequency of the ceramic output capacitor.
Output overshoot (V
SOAR
) determines the minimum
output capacitance requirement (see the
Output
Capacitor Selection
section). Often the switching frequen-
cy is increased to 550kHz or 1000kHz, and the inductor
value is reduced to minimize the energy transferred from
inductor to capacitor during load-step recovery. The effi-
ciency penalty for operating at 550kHz is about 2% to 3%
and about 5% at 1000kHz when compared to the
300kHz voltage-positioned circuit, primarily due to the
high-side MOSFET switching losses.
PC Board Layout Guidelines
Careful PC board layout is critical to achieve low
switching losses and clean, stable operation. The
switching power stage requires particular attention
(Figure 19). If possible, mount all of the power compo-
nents on the top side of the board with their ground ter-
minals flush against one another. Follow these
guidelines for good PC board layout:
1) Keep the high-current paths short, especially at the
ground terminals. This is essential for stable, jitter-
free operation.
2) All analog grounding is done to a separate solid cop-
per plane, which connects to the MAX1718 at the
GND pin. This includes the V
CC
, REF, and CC
30k
3.3V
~
200
μ
s
5V
SHUTDOWN
TO
SKP/SDN
SUS
SKP/SDN
~
200
μ
s
0V
2.0V
TO
SUS
V
CC
0.01
μ
F
V
CC
120k
80k
Figure 17. Using Skip Mode During Suspend (SKP/
SDN
= V
CC
)
DL
DH
FB
V
BATT
V
OUT
R1
R2
MAX1718
V
OUT
= V
FB
x
(
1 + R1
)
R2
Figure 18. Adjusting V
OUT
with a Resistor-Divider
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1718BEEI | Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning IMVP-II |
| MAX1720EUTG | Switched Capacitor Voltage Inverter with Shutdown |
| MAX1724EZK50 | 1.5uA IQ, Step-Up DC-DC Converters in Thin SOT23-5 |
| MAX1724EZK30 | 1.5uA IQ, Step-Up DC-DC Converters in Thin SOT23-5 |
| MAX1724EZK30-T | 1.5uA IQ, Step-Up DC-DC Converters in Thin SOT23-5 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1718BEEI | 制造商:Maxim Integrated Products 功能描述:NOTEBOOK CPU STEP-DOWN CONTROLLER FOR INTEL M - Rail/Tube |
| MAX1718BEEI+ | 制造商:Maxim Integrated Products 功能描述:NOTEBOOK CPU STEP-DOWN CONTROLLER FOR INTEL MOBILE VOLTAGE - Rail/Tube |
| MAX1718BEEI-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1718EEI | 制造商:Maxim Integrated Products 功能描述:NOTEBOOK CPU STEP-DOWN CONTROLLER FOR INTEL M - Bulk |
| MAX1718EEI+ | 制造商:Maxim Integrated Products 功能描述:LDO CNTRLR STDN 0.6V TO 1.75V 28QSOP - Rail/Tube |
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